JP4001041B2 - Engine cooling system - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to an engine cooling device for cooling an engine through circulation of a refrigerant.
[0002]
[Prior art]
2. Description of the Related Art A cooling device provided with a heat storage container is known as an engine cooling device that cools an engine through circulation of a refrigerant. In such a cooling device, it is possible to store the refrigerant while keeping the temperature of the refrigerant by flowing into the heat storage container the refrigerant that has become high temperature due to heat received from the engine.
[0003]
As an engine cooling device provided with a heat storage container, for example, a device described in Patent Document 1 is known.
The cooling device described in the document is used as a refrigerant circulation circuit.
[A] “Cooling with a radiator passage for returning the refrigerant flowing out from the engine body to the engine body through the radiator and a bypass passage for returning the refrigerant to the engine body by bypassing the radiator circuit"
[B] “Heat storage circuit provided with a heat storage passage and provided with a heat storage passage for allowing the refrigerant stored in the heat storage container to flow into the main body of the engine”
These [A] and [B] are provided with a circulation circuit.
[0004]
The bypass passage is provided with a control valve, and the open / close state of the bypass passage can be switched through the control of the control valve.
In this engine cooling device, after the engine warm-up is completed, the cooling water is circulated with the bypass passage opened, and the warm refrigerant is recovered into the heat storage container.
[0005]
[Patent Document 1]
Japanese Patent Laid-Open No. 10-77839
[0006]
[Problems to be solved by the invention]
By the way, in an engine cooling device equipped with a heat storage container, by storing the high-temperature refrigerant flowing out from the engine in the heat storage container, the engine is warmed up using this refrigerant at the next engine start. Promotion is possible.
[0007]
Therefore, when the temperature of the refrigerant flowing out of the engine is high, it is desired to increase the flow rate of the refrigerant flowing into the heat storage container to increase the refrigerant recovery efficiency. However, as in the conventional engine cooling device, the engine If the bypass passage is opened after the warm-up is completed, it is difficult to efficiently collect the high-temperature refrigerant.
[0008]
This invention is made | formed in view of such a situation, The objective is to provide the cooling device of the engine which can collect | recover a high temperature refrigerant | coolant efficiently in a thermal storage container.
[0009]
[Means for Solving the Problems]
In the following, means for achieving the above object and its effects are described.
According to a first aspect of the present invention, there is provided a radiator passage for allowing the refrigerant flowing out from the main body of the engine to flow into the main body of the engine via the radiator, and the refrigerant flowing out of the main body of the engine without passing through the radiator. A cooling circuit configured to include a bypass passage for flowing into the main body of the engine and a first control valve for controlling a flow rate of the refrigerant flowing through the bypass passage, and the refrigerant flowing out from the main body of the engine A heat storage passage that constitutes a heat storage circuit for circulating the refrigerant through the main body of the engine and the heat storage container by being selectively connected to the cooling circuit and provided with a heat storage container for storing the engine. After the engine is warmed up, the refrigerant flowing out of the main body of the engine flows through the bypass passage by opening the first control valve The engine cooling device includes a control unit that closes the first control valve and causes the refrigerant to flow into the heat storage container when the temperature of the refrigerant flowing out of the main body of the engine is equal to or higher than a predetermined temperature. This is the gist.
[0010]
According to the above configuration, after the engine is warmed up, when the temperature of the refrigerant flowing out from the engine body is equal to or higher than the predetermined temperature, the refrigerant is collected into the heat storage container with the first control valve closed. Is called. As described above, when the high-temperature refrigerant flowing out from the main body of the engine is collected in the heat storage container, the flow rate of the refrigerant flowing into the heat storage container is increased by closing the bypass passage. The refrigerant can be efficiently recovered into the heat storage container.
[0011]
According to a second aspect of the present invention, in the engine cooling apparatus according to the first aspect, the cooling circuit further includes a second control valve for controlling a flow rate of the refrigerant flowing through the radiator passage, and the control means. The gist is that the second control valve is closed when the first control valve is closed and the refrigerant flowing out of the main body of the engine is caused to flow into the heat storage container.
[0012]
According to the above configuration, when the refrigerant is collected into the heat storage container with the first control valve closed, the second control valve is closed. Thus, when the high-temperature refrigerant that has flowed out of the engine is recovered in the heat storage container, the flow rate of the refrigerant flowing into the heat storage container is increased by closing the radiator passage, so that the refrigerant recovery The efficiency can be further improved.
[0013]
According to a third aspect of the present invention, in the engine cooling device according to the first or second aspect, the control means cannot recover the refrigerant flowing out of the main body of the engine into the heat storage container during the operation of the engine. When the engine is stopped, the gist is to allow the refrigerant flowing out of the main body of the engine to flow into the heat storage container with the first control valve closed.
[0014]
According to the above configuration, when the refrigerant flowing out from the main body of the engine is not recovered into the heat storage container during the operation of the engine, the first control valve (the first control is related to the invention according to claim 1) while the engine is stopped. With respect to the valve and the invention described in claim 2, the refrigerant is collected into the heat storage container in a state where the first control valve and the second control valve are closed. As described above, since the refrigerant is collected even when the engine is stopped, the warm refrigerant can be collected into the heat storage container as much as possible. Moreover, since the flow rate of the refrigerant flowing into the heat storage container is increased by closing the bypass passage (further, the radiator passage in the case of the invention described in claim 2), the warm refrigerant is efficiently introduced into the heat storage container. It becomes possible to collect well.
[0015]
According to a fourth aspect of the present invention, in the engine cooling apparatus according to the third aspect, the engine cooling apparatus includes a heater core that exchanges heat between the refrigerant flowing out of the engine body and the air for heating the vehicle interior. A heater passage configured to circulate the refrigerant through the main body of the engine and the heater core by being selectively connected to the cooling circuit, and the control means includes the cooling means The connection mode of the heater passage to the circuit is controlled, and when the refrigerant flowing out from the engine main body flows into the heat storage container during operation of the engine, the heater passage is kept connected to the cooling circuit. On the other hand, when the refrigerant flowing out from the main body of the engine is allowed to flow into the heat storage container while the engine is stopped, Are summarized as cutting the over data paths from said cooling circuit.
[0016]
According to the above configuration, when the refrigerant flowing out from the main body of the engine during operation of the engine is recovered in the heat storage container, the heater passage is maintained in a state connected to the cooling circuit. On the other hand, when the refrigerant flowing out from the main body of the engine is recovered in the heat storage container while the engine is stopped, the heater passage is maintained in a state disconnected from the cooling circuit. As described above, when recovering the refrigerant into the heat storage container during the operation of the engine, the high-temperature refrigerant is supplied to the heater core, so that it is possible to suitably suppress the deterioration of the heater performance. Further, when the refrigerant is recovered into the heat storage container while the engine is stopped, the flow rate of the refrigerant flowing into the heat storage container is increased by disconnecting the heat storage passage from the cooling circuit. It becomes possible to efficiently recover the refrigerant into the heat storage container.
[0017]
According to a fifth aspect of the present invention, in the engine cooling apparatus according to the fourth aspect, when the control means causes the refrigerant flowing out from the main body of the engine to flow into the heat storage container during operation of the engine, the refrigerant The heater passage is maintained connected to the cooling circuit on the condition that there is a request to flow into the heater core, while the heater passage is disconnected from the cooling circuit when the condition is not satisfied. It is said.
[0018]
According to the above configuration, when the refrigerant is collected into the heat storage container during the operation of the engine, the heater passage is connected to the cooling circuit on condition that the refrigerant flowing out from the main body of the engine is required to flow into the heater core. Stay connected. On the other hand, when there is no request for the refrigerant flowing out of the main body of the engine to flow into the heater core, the heater passage is disconnected from the cooling circuit. As described above, when it is not necessary to cause the refrigerant to flow into the heater core, the flow rate of the refrigerant flowing into the heat storage container is increased through the disconnection of the heater passage from the cooling circuit. Further improvements can be made.
[0019]
According to a sixth aspect of the present invention, in the engine cooling device according to any one of the first to fifth aspects, the cooling circuit causes the refrigerant flowing out from the main body of the engine to flow into the main body of the engine through the throttle body. And a control valve that opens and closes the throttle passage, and the control means closes the first control valve to allow the refrigerant flowing out of the engine body to flow into the heat storage container. The gist is to close the on-off valve when inflowing.
[0020]
According to the above configuration, heat storage is performed in a state where the first control valve (the first control valve for the invention described in claim 1 and the first control valve and the second control valve for the invention described in claim 2) are closed. When the refrigerant is collected into the container, the on-off valve is closed. Thus, when recovering the high-temperature refrigerant flowing out from the engine into the heat storage container, the flow rate of the refrigerant flowing into the heat storage container is further increased through the closing of the throttle passage, so that the refrigerant recovery efficiency is increased. Can be further improved.
[0021]
DETAILED DESCRIPTION OF THE INVENTION
(First embodiment)
A first embodiment of the present invention will be described with reference to FIGS.
[0022]
FIG. 1 shows an overall configuration of an engine cooling device 1 having a cooling function of the engine E (engine body).
First, the function of each component provided in the engine cooling device 1 will be described.
[0023]
The water pump 11 is driven through the engine E and pumps cooling water.
The radiator 12 performs heat exchange between the cooling water and the outside air.
[0024]
The throttle body 13 has a built-in throttle valve and adjusts the intake air amount according to the opening of the valve.
The heater core 14 exchanges heat between the cooling water and air for heating the vehicle interior (air for heating the vehicle interior) flowing through the heater 14H. The heat-exchanged air is supplied to the passenger compartment through the heater 14H.
[0025]
The electric water pump 15 is driven through the battery and pumps the cooling water.
The heat storage container 16 stores the cooling water and insulates the cooling water from the air outside the container. Thereby, the cooling water is stored in the heat storage container 16 while being kept warm.
[0026]
The cooling water delivery pipe 17 allows the cooling water flowing out of the heat storage container 16 to flow into the cylinder head of the engine E.
The thermostat 21 operates according to the temperature of the cooling water and adjusts the flow rate of the cooling water flowing into the radiator 12. When the opening degree of the thermostat 21 is the minimum opening degree (fully closed), the flow rate of the cooling water flowing into the radiator 12 becomes “0”, and flows into the radiator 12 as the opening degree of the thermostat 21 approaches the maximum opening degree (fully opened). The flow rate of the cooling water to be increased.
[0027]
The flow rate control valve 22 can continuously change the opening degree of the valve, and adjusts the flow rate of the cooling water in the flow passage (bypass passage) for bypassing the radiator 12 and circulating the cooling water. To do. When the opening degree of the flow control valve 22 is the minimum opening degree (fully closed), the flow rate of the cooling water flowing through the flow passage becomes “0”, and the opening degree of the flow control valve 22 approaches the maximum opening degree (fully opened). The flow rate of the cooling water flowing through the flow passage increases.
[0028]
The on-off valve 23 can be switched to either open or closed, and switches the flow mode of the cooling water in the flow passage (throttle passage) for allowing the cooling water to flow into the throttle body 13. When the on-off valve 23 is in the open state, the cooling water is supplied to the throttle body 13. On the other hand, when the on-off valve 23 is in the closed state, the cooling water is not supplied to the throttle body 13.
[0029]
The three-way valve 24 includes three ports (a first port P1, a second port P2, and a third port P3), and selectively changes the flow mode of the cooling water by changing the open / closed state of these ports. .
[0030]
The electronic control unit (ECU) 3 comprehensively controls the electric water pump 15, the flow control valve 22, the on-off valve 23, and the three-way valve 24. The control means includes an ECU 3.
[0031]
Next, each sensor constituting the detection system of the engine cooling device 1 will be described. Each data detected through the detection system is input to the ECU 3.
The engine water temperature sensor S1 detects the temperature of the cooling water flowing out from the engine E (engine water temperature THwe).
[0032]
The heat storage container water temperature sensor S2 detects the temperature of the cooling water in the heat storage container 16 (heat storage container water temperature THwt).
Next, the flow path of the cooling water in the engine cooling device 1 will be described.
[0033]
The first cooling passage R <b> 1 connects the engine E and the first port P <b> 1 of the three-way valve 24.
The second cooling passage R <b> 2 connects the engine E and the thermostat 21.
[0034]
The third cooling passage R3 connects the first cooling passage R1 and the radiator 12.
The fourth cooling passage R <b> 4 connects the radiator 12 and the thermostat 21.
The fifth cooling passage R5 connects the first cooling passage R1 and the flow control valve 22.
[0035]
The sixth cooling passage R6 connects the flow control valve 22 and the second cooling passage R2 via the thermostat 21. The sixth cooling passage R6 communicates with the second cooling passage R2 regardless of the open / close state of the thermostat 21.
[0036]
The seventh cooling passage R7 connects the first cooling passage R1 and the on-off valve 23.
The eighth cooling passage R8 connects the on-off valve 23 and the throttle body 13.
The ninth cooling passage R9 connects the throttle body 13 and the second cooling passage R2 via the thermostat 21. The ninth cooling passage R9 communicates with the second cooling passage R2 regardless of the open / close state of the thermostat 21.
[0037]
The tenth cooling passage R <b> 10 connects the second port P <b> 2 of the three-way valve 24 and the heater core 14.
The eleventh cooling passage R11 connects the heater core 14 and the second cooling passage R2 via the thermostat 21. The eleventh cooling passage R11 communicates with the second cooling passage R2 regardless of the open / closed state of the thermostat 21.
[0038]
The twelfth cooling passage R <b> 12 connects the third port P <b> 3 of the three-way valve 24 and the electric water pump 15.
The thirteenth cooling passage R <b> 13 connects the electric water pump 15 and the heat storage container 16.
[0039]
The fourteenth cooling passage R <b> 14 connects the heat storage container 16 and the cooling water delivery pipe 17.
Through the cooling passages, a radiator passage, a bypass passage, a throttle passage, a heater passage, and a heat storage passage, which will be described below, are configured. Each of these cooling passages can be selectively switched between open and closed states through control of control valves (flow control valve 22, on-off valve 23, and three-way valve 24) provided in the respective cooling passages. It has become.
[0040]
[Radiator passage]
A radiator passage is constituted by the third cooling passage R3 and the fourth cooling passage R4.
The radiator passage is opened when the thermostat 21 is opened, and is closed when the thermostat 21 is closed.
[0041]
When the radiator passage is open, cooling water flows through the radiator 12.
[Bypass passage]
The fifth cooling passage R5 and the sixth cooling passage R6 constitute a bypass passage.
[0042]
The bypass passage is opened when the flow control valve 22 is open, and is closed when the flow control valve 22 is closed.
When the bypass passage is opened, the cooling water circulates bypassing the radiator 12.
[0043]
[Throttle passage]
The seventh cooling passage R7, the eighth cooling passage R8, and the ninth cooling passage R9 constitute a throttle passage.
[0044]
The throttle passage is opened when the opening / closing valve 23 is open, and is closed when the opening / closing valve 23 is closed.
When the throttle passage is open, the cooling water flows through the throttle body 13.
[0045]
[Heater passage]
The tenth cooling passage R10 and the eleventh cooling passage R11 constitute a heater passage.
[0046]
The heater passage can be selectively connected to the first cooling passage R <b> 1 through control of the three-way valve 24.
The heater passage is opened when the first port P1 and the second port P2 of the three-way valve 24 are open, while either the first port P1 or the second port P2 of the three-way valve 24 is opened. Closes when the valve is closed.
[0047]
When the heater passage is opened, the cooling water flows through the heater core 14.
[Heat storage passage]
The twelfth cooling passage R12, the thirteenth cooling passage R13, and the fourteenth cooling passage R14 constitute a heat storage passage.
[0048]
The heat storage passage can be selectively connected to the first cooling passage R <b> 1 through the control of the three-way valve 24.
The heat storage passage is opened when the first port P1 and the third port P3 of the three-way valve 24 are open, while either the first port P1 or the third port P3 of the three-way valve 24 is opened. Closes when the valve is closed.
[0049]
When the heat storage passage is opened, the cooling water flows through the heat storage container 16.
The following circulation circuits for circulating the cooling water are constituted by the cooling passages.
[0050]
[Cooling circuit]
First cooling passage R1, radiator passage (third cooling passage R3 and fourth cooling passage R4), bypass passage (fifth cooling passage R5 and sixth cooling passage R6), throttle passage (seventh cooling passage R7 to ninth cooling passage) A cooling circuit is constituted by the passage R9) and the second cooling passage R2.
[0051]
The cooling circuit is open when at least one of the radiator passage, the bypass passage, and the throttle passage is open, and is closed when each of the cooling passages is closed.
[0052]
When cooling water circulates through the cooling circuit, heat exchange is performed between the engine E and the cooling water.
When cooling water circulates through the radiator passage, heat is exchanged between the outside air and the cooling water in the radiator 12.
[0053]
When the cooling water circulates through the bypass passage, the heat dissipation of the cooling water in the radiator 12 is suppressed.
When cooling water circulates through the throttle passage, heat is exchanged between the throttle body 13 and the cooling water.
[0054]
[Heat storage circuit]
A heat storage circuit is configured by the first cooling passage R1 and the heat storage passage (the twelfth cooling passage R12 to the fourteenth cooling passage R14).
[0055]
The heat storage circuit is opened when the heat storage passage is connected to the cooling circuit (first cooling passage R1), while the heat storage passage is closed when the heat storage passage is disconnected from the cooling circuit.
[0056]
When the cooling water circulates through the heat storage circuit, heat exchange is performed between the cooling water stored in the heat storage container 16 and the engine E.
When the on-off valve 23 is opened, heat exchange is performed between the cooling water stored in the heat storage container 16 and the throttle body 13.
[0057]
When the first port P1 and the second port P2 of the three-way valve 24 are opened, heat exchange is performed between the cooling water stored in the heat storage container 16 in the heater core 14 and the air for heating the vehicle interior. Done.
[0058]
[Heater circuit]
The first cooling passage R1, the heater passage (the tenth cooling passage R10 and the eleventh cooling passage R11), and the second cooling passage R2 constitute a heater circuit.
[0059]
The heater circuit is opened when the heater passage is connected to the cooling circuit (first cooling passage R1), and is closed when the heater passage is disconnected from the cooling circuit.
[0060]
When cooling water circulates through the heater circuit, heat is exchanged between the vehicle interior heating air and the cooling water in the heater core 14.
By the way, in the engine cooling device 1, by storing the high-temperature cooling water (hot water) flowing out from the engine E in the heat storage container 16, the engine is used by using this hot water at the next start of the engine E. It becomes possible to promote warm-up of E.
[0061]
Therefore, when the temperature of the cooling water flowing out from the engine E is high, it is desirable to increase the flow rate of the cooling water flowing into the heat storage container 16 and efficiently recover the hot water into the heat storage container 16. When the cooling water is circulated with the bypass passage opened after the completion of the machine, it is difficult to efficiently collect the hot water.
[0062]
Therefore, in the present embodiment, in consideration of such a case, the hot water is recovered into the heat storage container 16 through the “hot water recovery process during engine operation” (FIG. 2) described below.
[0063]
[Warm water recovery process during engine operation]
With reference to FIG. 2, the “warm water recovery process during engine operation” will be described. Note that this processing corresponds to processing performed through the control means.
[0064]
This process is started after the warm-up of the engine E is completed, and is ended after the processes of steps S101 to S106 described below are performed.
[Step S101] It is determined whether or not the engine water temperature THwe is equal to or higher than a predetermined temperature (hot water recovery determination temperature THwX). That is, the following conditions
THwe ≧ THwX
It is determined whether or not is satisfied.
[0065]
When the engine coolant temperature THwe is lower than the warm water recovery determination temperature THwX, the determination process is repeatedly executed at predetermined intervals.
The hot water recovery determination temperature THwX is used as an engine water temperature threshold value indicating whether or not the cooling water flowing out from the engine E is in a high temperature state. That is, when the engine water temperature THwe is equal to or higher than the hot water recovery determination temperature THwX, the cooling water flowing out from the engine E is in a high temperature state.
[0066]
Incidentally, the hot water recovery determination temperature THwX can be set according to the warm-up performance required for the engine E, the heating performance required for the heater 14H, and the like.
[Step S102] When the engine coolant temperature THwe is equal to or higher than the warm water recovery determination temperature THwX, whether or not there is a heater request indicating that the heating function of the heater 14H is requested (there is a request to allow warm water to flow into the heater core 14) ( It is determined whether or not the heater request flag exHC is “ON”. That is, the following conditions
exHC = ON
It is determined whether or not is satisfied.
[0067]
The presence / absence of a heater request can be determined based on the temperature of the outside air, the amount of solar radiation, the temperature in the passenger compartment, the humidity in the passenger compartment, the ON / OFF state of the defogger switch, and the air conditioning setting state.
[0068]
Incidentally, when there is a heater request, the heater passage is basically maintained in a state connected to the cooling circuit.
[Step S103] When there is a heater request (when the heater request flag exHC is “ON”), the following operations [a] to [c] are performed.
[A] All ports of the three-way valve 24 are opened.
[B] The flow control valve 22 is fully closed.
[C] The on-off valve 23 is closed.
[0069]
Through these operations, the heat storage passage and the heater passage are connected to the cooling circuit (the heat storage passage and the heater passage are opened), while the bypass passage and the throttle passage are closed.
[0070]
Thereby, since the cooling water circulates through the heat storage circuit, the hot water flowing out from the engine E flows into the heat storage container 16. That is, the hot water is recovered into the heat storage container 16.
[0071]
Further, since the cooling water circulates through the heater circuit, the hot water flowing out from the engine E flows into the heater core 14.
[Step S104] When the heater request flag exHC is “off”, the following operations [a] to [d] are performed.
[A] The first port P1 and the third port P3 of the three-way valve 24 are opened.
[B] The second port P2 of the three-way valve 24 is closed.
[C] The flow control valve 22 is fully closed.
[D] The on-off valve 23 is closed.
[0072]
Through these operations, the heat storage passage is connected to the cooling circuit (the heat storage passage is opened), while the bypass passage, the throttle passage, and the heater passage are closed.
Thereby, since the cooling water circulates through the heat storage circuit, the hot water flowing out from the engine E is recovered into the heat storage container 16.
[0073]
[Step S105] It is determined whether or not the period during which hot water is collected into the heat storage container 16 (warm water collection period Pwww) is equal to or longer than a predetermined collection period PwwX. That is, the following conditions
Pww ≧ PwwX
It is determined whether or not is satisfied.
[0074]
When the hot water recovery period Pww is less than the predetermined recovery period PwwX, the above determination process is repeatedly executed at predetermined intervals.
The predetermined recovery period PwwX is used as a threshold value for the hot water recovery period indicating whether or not the hot water flowing out from the engine E has been sufficiently recovered into the heat storage container 16. That is, when the hot water recovery period Pww becomes equal to or longer than the predetermined recovery period PwwX, a sufficient amount of hot water is stored in the heat storage container 16.
[0075]
Incidentally, the predetermined recovery period PwwX can be set according to the capacity of the heat storage container 16, the pump performance, and the like.
[Step S106] When the hot water recovery period Pww becomes equal to or longer than the predetermined recovery period PwwX, the third port P3 of the three-way valve 24 is closed.
[0076]
Through this operation, the heat storage passage is disconnected from the cooling circuit.
Thus, according to the hot water recovery process during engine operation, hot water is recovered in the following modes [A] and [B].
[A] When the engine water temperature THwe is equal to or higher than the hot water recovery determination temperature THwX and the heater request flag exHC is “ON”, the heat storage passage and the heater passage are maintained in a state of being connected to the cooling circuit, while the bypass passage and the throttle passage are Keep it closed and collect hot water.
[B] When the engine water temperature THwe is equal to or higher than the hot water recovery determination temperature THwX and the heater request flag exHC is “OFF”, the heat storage passage is maintained in a state connected to the cooling circuit, while the bypass passage, the throttle passage, and the heater passage Keep the water closed and collect hot water.
[0077]
Here, with reference to FIG. 3, the control mode of the engine cooling device 1 by the hot water recovery process (FIG. 2) during engine operation will be summarized.
When the engine coolant temperature THwe is equal to or higher than the warm water recovery determination temperature THwX and the heater request flag exHC is “ON”, the engine cooling device 1 is controlled in the following modes [A1] to [A4].
[A1] The flow control valve 22 is fully closed.
[A2] The on-off valve 23 is closed.
[A3] All the ports of the three-way valve 24 are opened.
[A4] The electric water pump 15 is stopped.
[0078]
When the engine coolant temperature THwe is equal to or higher than the warm water recovery determination temperature THwX and the heater request flag exHC is “off”, the engine cooling device 1 is controlled in the following modes [B1] to [B4].
[B1] The flow control valve 22 is fully closed.
[B2] The on-off valve 23 is closed.
[B3] The first port P1 and the third port P3 of the three-way valve 24 are opened.
[B4] The second port P2 of the three-way valve 24 is closed.
[B5] The electric water pump 15 is stopped.
[0079]
Incidentally, the thermostat 21 is maintained at an opening degree corresponding to the temperature of the cooling water.
In the operation state other than the above, the flow rate control valve 22, the on-off valve 23, the three-way valve 24, and the electric water pump 15 are controlled according to the operation state of the engine E by a separate process.
[0080]
Next, with reference to FIG.4 and FIG.5, the circulation aspect of the cooling water at the time of hot water collection | recovery during engine operation is demonstrated. 4 and 5, the cooling passages indicated by solid lines indicate passages through which cooling water flows, the arrows indicate the flow direction of cooling water, and the cooling passages indicated by broken lines indicate passages through which cooling water does not flow. .
[0081]
[Cooling water circulation mode [1]]
With reference to FIG. 4, the cooling water circulation mode when “the engine water temperature THwe is equal to or higher than the hot water recovery determination temperature THwX and the heater request flag exHC is“ ON ”” will be described.
[0082]
At this time, since the heat storage passage and the heater passage are connected to the cooling circuit, the cooling water circulates through the first cooling passage R1, the heat storage passage, the heater passage, and the second cooling passage R2.
[0083]
Further, assuming that the thermostat 21 is in an open state, the cooling water circulates through the first cooling passage R1, the radiator passage, and the second cooling passage R2.
On the other hand, since the bypass passage and the throttle passage are closed, the cooling water does not flow through these cooling passages.
[0084]
[Cooling water circulation mode [2]]
With reference to FIG. 5, the circulation mode of the cooling water when “the engine water temperature THwe is equal to or higher than the hot water recovery determination temperature THwX and the heater request flag exHC is“ off ”” will be described.
[0085]
At this time, since the heat storage passage is connected to the cooling circuit, the cooling water circulates through the first cooling passage R1 and the heat storage passage.
Further, assuming that the thermostat 21 is in an open state, the cooling water circulates through the first cooling passage R1, the radiator passage, and the second cooling passage R2.
[0086]
On the other hand, since the bypass passage, the throttle passage, and the heater passage are closed, the cooling water does not flow through each of the cooling passages.
Next, the effect obtained by the hot water recovery process during engine operation (FIG. 2) will be described.
[0087]
In this process, when the engine water temperature THwe is equal to or higher than the hot water recovery determination temperature THwX, the heat storage passage is connected to the cooling circuit and the bypass passage is closed.
[0088]
As described above, when the hot water flowing out from the engine E is collected in the heat storage container 16, the flow rate of the warm water flowing into the heat storage container 16 is increased through the closing of the bypass passage. It will be done efficiently.
[0089]
In this process, when the engine water temperature THwe is equal to or higher than the hot water recovery determination temperature THwX, the throttle passage is closed together with the bypass passage.
As described above, when the hot water flowing out from the engine E is collected in the heat storage container 16, the flow of the hot water flowing into the heat storage container 16 is further increased through the closing of the throttle passage. Efficiency will be further improved.
[0090]
In this process, when the engine water temperature THwe is equal to or higher than the hot water recovery determination temperature THwX and the heater request is “ON”, the heater passage is opened together with the heat storage passage.
[0091]
Thus, when there is a heater request when collecting hot water into the heat storage container 16, since the hot water is supplied to the heater core 14 by opening the heater passage, the heating performance of the heater 14H deteriorates. Will be suppressed.
[0092]
In this process, when the engine water temperature THwe is equal to or higher than the hot water recovery determination temperature THwX and the heater request is “off”, among the cooling passages that can be opened and closed through control of the control valve, The passage and the heater passage) are closed.
[0093]
In this way, when there is no heater request when collecting hot water into the heat storage container 16, the flow rate of hot water flowing into the heat storage container 16 is further increased through the closing of the cooling passages. Further, the recovery efficiency of hot water can be further improved.
[0094]
Next, with reference to FIG. 6, an example of a hot water recovery mode by the “hot water recovery process during engine operation” will be described.
It is assumed that the heater request flag exHC is turned “ON” at time t61 (FIG. 6: [b]).
[0095]
At this time, the heater passage is opened (FIG. 6: [d]).
Assume that the engine water temperature THwe becomes equal to or higher than the hot water recovery determination temperature THwX at time t62 (FIG. 6: [a]).
[0096]
At this time,
[C] Open the heat storage passage (connect the heat storage passage to the cooling circuit).
[D] The connection state between the heater passage and the cooling circuit is maintained.
[E] Keep the bypass passage closed.
[F] The throttle passage is kept closed.
Each of the above operations is performed.
[0097]
Thereby, since the cooling water is circulated through the heat storage circuit and the heater circuit, the hot water is collected into the heat storage container 16, and the heating performance of the heater 14H is prevented from being lowered.
[0098]
It is assumed that the hot water recovery period Pww becomes equal to or longer than the predetermined recovery period PwwX at time t63.
At this time,
[C] Close the heat storage passage (cut the heat storage passage from the cooling circuit).
The above operation is performed.
[0099]
Thereafter, the open / closed state of each cooling passage is controlled according to the operating state of the engine E and the like.
As described above in detail, according to the engine cooling apparatus of the first embodiment, the following excellent effects can be obtained.
[0100]
(1) In the present embodiment, when the engine water temperature THwe is equal to or higher than the hot water recovery determination temperature THwX, the heat storage passage is connected to the cooling circuit and the bypass passage is closed. As described above, when the hot water flowing out from the engine E is collected in the heat storage container 16, the flow rate of the hot water flowing into the heat storage container 16 is increased through the closing of the bypass passage. It can be recovered.
[0101]
(2) In the present embodiment, when the engine coolant temperature THwe is equal to or higher than the warm water recovery determination temperature THwX, the throttle passage is closed together with the bypass passage. As described above, when the hot water flowing out from the engine E is collected in the heat storage container 16, the flow of the hot water flowing into the heat storage container 16 is further increased through the closing of the throttle passage. The efficiency can be further improved.
[0102]
(3) In the present embodiment, when the engine water temperature THwe is equal to or higher than the hot water recovery determination temperature THwX and the heater request is “ON”, the heater passage is opened together with the heat storage passage. Thus, when there is a heater request when collecting hot water into the heat storage container 16, since the hot water is supplied to the heater core 14 by opening the heater passage, the heating performance of the heater 14H deteriorates. Can be suitably suppressed.
[0103]
(4) In the present embodiment, when the engine water temperature THwe is equal to or higher than the hot water recovery determination temperature THwX and the heater request is “OFF”, each cooling passage other than the heat storage passage among the cooling passages that can be opened and closed through control of the control valve (Bypass passage, throttle passage, and heater passage) are closed. In this way, when there is no heater request when collecting hot water into the heat storage container 16, the flow rate of hot water flowing into the heat storage container 16 is further increased through the closing of the cooling passages. Further, it becomes possible to further improve the recovery efficiency of hot water.
[0104]
Note that the first embodiment can be implemented as, for example, the following form, which is appropriately changed.
In the first embodiment, in step S102 of “warm water recovery processing during engine operation”, the presence / absence of a heater request is determined and the opening / closing state of the heater passage is switched according to the determination result. For example, it can be changed as follows. In other words, the processes of steps S102 and S104 are omitted, and when the engine water temperature THwe is equal to or higher than the hot water recovery determination temperature THwX, the hot water can be recovered through the processes after step S103.
[0105]
In the first embodiment, when the hot water recovery period Pww is less than the predetermined recovery period PwwX in step S105 of “warm water recovery process during engine operation” (FIG. 2), the determination process of step S105 is Although it is configured so as to be repeatedly executed for each cycle, it can be changed as follows, for example. That is, when the hot water recovery period Pww is less than the predetermined recovery period PwwX, the “hot water recovery process during engine operation” can be resumed from step S101 or step S102.
[0106]
In the first embodiment, the “warm water recovery process during engine operation” is started after the warm-up of the engine E is completed. The start time of the process is exemplified in the first embodiment. The start time is not limited to this, and can be changed as appropriate.
[0107]
In the first embodiment, the processing of steps S101 to S106 is performed, and then the “warm water recovery processing during engine operation” is terminated. However, for example, the following modifications can be made. . That is, the process can be resumed after the “hot water recovery process during engine operation” is completed. In addition, when the elapsed period from the end of the “hot water recovery process during engine operation” becomes equal to or longer than a predetermined period, the process can be resumed.
[0108]
In the first embodiment, when the engine water temperature THwe is equal to or higher than the hot water recovery determination temperature THwX, the heat storage passage is opened and the hot water is recovered. However, when the hot water is recovered, the electric water pump 15 is driven. Thereby, the recovery efficiency of warm water can be further improved.
[0109]
(Second Embodiment)
A second embodiment embodying the present invention will be described with reference to FIGS. In addition, since the structure of the whole apparatus in this Embodiment is the structure similar to the apparatus of the said 1st Embodiment, the overlapping description is omitted.
[0110]
By the way, if the warm water is not collected into the heat storage container 16 during the operation of the engine E, it becomes impossible to promote the warm-up of the engine E through the hot water at the next engine start. It is desirable to avoid the state where hot water is not stored in 16 as much as possible.
[0111]
Therefore, in the present embodiment, in consideration of these points, the “warm water recovery process while the engine is stopped” (FIG. 7) described below is performed. In the present embodiment, “warm water recovery process during engine operation” (FIG. 2) is performed while the engine E is operating, and “warm water recovery process while the engine is stopped” is performed while the engine E is stopped.
[0112]
[Warm water recovery process while the engine is stopped]
With reference to FIG. 7, the “warm water recovery process while the engine is stopped” will be described.
This process is started when the engine E is stopped, and is terminated after the processes of steps S201 to S205 described below are performed.
[0113]
[Step S201] It is determined whether or not hot water has been collected during operation of the engine E (whether or not the hot water collection flag exCW is “ON”). That is, the following conditions
exCW = ON
It is determined whether or not is satisfied.
[0114]
When the hot water has already been collected (when the hot water collection flag exCW is “ON”), this process is terminated.
The hot water recovery flag exCW is set after the recovery of the hot water into the heat storage container 16 is completed.
[0115]
[Step S202] When warm water is not collected (when the warm water collection flag exCW is “off”), the following operations [a] to [d] are performed.
[A] The first port P1 and the third port P3 of the three-way valve 24 are opened.
[B] The second port P2 of the three-way valve 24 is closed.
[C] The flow control valve 22 is fully closed.
[D] The on-off valve 23 is closed.
[0116]
Through these operations, the heat storage passage is connected to the cooling circuit, while the bypass passage, the throttle passage, and the heater passage are closed.
[Step S203] The electric water pump 15 is driven.
[0117]
Through this operation, the cooling water circulates through the heat storage circuit.
Thereby, the hot water flowing out from the engine E is recovered into the heat storage container 16.
[0118]
[Step S204] It is determined whether or not the period during which hot water is collected into the heat storage container 16 (warm water collection period Pww) is equal to or longer than a predetermined collection period PwwX. That is, the following conditions
Pww ≧ PwwX
It is determined whether or not is satisfied.
[0119]
When the hot water recovery period Pww is less than the predetermined recovery period PwwX, the above determination process is repeatedly executed at predetermined intervals.
The predetermined recovery period PwwX is used as a threshold value for the hot water recovery period indicating whether or not the hot water flowing out from the engine E has been sufficiently recovered into the heat storage container 16. That is, when the hot water recovery period Pww becomes equal to or longer than the predetermined recovery period PwwX, a sufficient amount of hot water is stored in the heat storage container 16.
[0120]
Incidentally, the predetermined recovery period PwwX can be set according to the capacity of the heat storage container 16, the pump performance, and the like.
[Step S205] When the hot water recovery period Pww becomes equal to or longer than the predetermined recovery period PwwX, the electric water pump 15 is stopped.
[0121]
[Step S206] The first port P1 and the third port P3 of the three-way valve 24 are closed.
Through this operation, the heat storage passage is disconnected from the cooling circuit.
[0122]
Thus, according to the hot water recovery process while the engine is stopped, the hot water is recovered in the following mode [C].
[C] When hot water is not collected into the heat storage container 16 during operation of the engine E, after the engine E is stopped, the heat storage passage is connected to the cooling circuit and the electric water pump 15 is driven for a predetermined period. To do.
[0123]
Here, with reference to FIG. 8, the control mode of the engine cooling device 1 by the hot water recovery process (FIG. 7) while the engine is stopped will be summarized.
When the hot water recovery flag exCW is “off” while the engine E is stopped, the engine cooling device 1 is controlled in the following modes [C1] to [C5].
[C1] The flow control valve 22 is fully closed.
[C2] The on-off valve 23 is closed.
[C3] The first port P1 and the third port P3 of the three-way valve 24 are opened.
[C4] The second port P2 of the three-way valve 24 is closed.
[C5] The electric water pump 15 is driven.
[0124]
Incidentally, the thermostat 21 is maintained at an opening degree corresponding to the temperature of the cooling water.
Note that when the hot water recovery flag exCW is “ON” while the engine E is stopped, no special control is performed on the engine cooling device 1.
[0125]
Next, with reference to FIG. 9, the circulation mode of the cooling water at the time of hot water recovery while the engine is stopped will be described. In FIG. 9, the cooling passage shown by a solid line indicates a passage through which cooling water flows, the arrow indicates the direction of the cooling water flow, and the cooling passage indicated by a broken line indicates a passage through which cooling water does not flow.
[0126]
[Cooling water circulation mode [3]]
When the hot water recovery flag exCW is “off” while the engine E is stopped, the heat storage passage is connected to the cooling circuit and the electric water pump 15 is driven, so that the cooling water is supplied to the first cooling passage R1 and the heat storage passage. It will circulate through the passage.
[0127]
Next, the effect obtained by the hot water recovery process (FIG. 7) while the engine is stopped will be described.
In this process, when the hot water is not collected into the heat storage container 16 during the operation of the engine E, the heat storage passage is connected to the cooling circuit and the cooling water is circulated through the electric water pump 15 after the engine E is stopped. I try to let them.
[0128]
As described above, when the hot water is not collected into the heat storage container 16 during the operation of the engine E, the hot water is collected while the engine E is stopped. Will be recovered.
[0129]
In this process, when collecting hot water into the heat storage container 16 while the engine E is stopped, only the heat storage passage is opened among the cooling passages that can be opened and closed through control of the control valve, and each cooling passage other than the heat storage passage (bypass The passage, the throttle passage, and the heater passage) are closed.
[0130]
As described above, since the flow rate of the warm water flowing into the heat storage container 16 is increased by closing the cooling passages other than the heat storage passage when the hot water is collected, the hot water can be collected efficiently. become.
[0131]
Next, with reference to FIG. 10, an example of the hot water recovery mode by the “hot water recovery process while the engine is stopped” will be described.
Assume that the engine E is stopped at time t101 (FIG. 10: [a]).
[0132]
At this time, if the hot water recovery flag exCW is “off”,
[C] The heat storage passage is opened.
[D] The heater passage is closed.
[E] Close the bypass passage.
[F] Close the throttle passage.
[G] Driving of the electric water pump 15 is started.
Each of these operations is performed.
[0133]
Thereby, since the cooling water circulates through the heat storage circuit, the hot water flowing out from the engine E is stored in the heat storage container 16.
It is assumed that the hot water recovery period Pww exceeds the predetermined recovery period PwwX at time t102.
[0134]
At this time,
[C] The heat storage passage is closed.
[G] The electric water pump 15 is stopped.
Each of these operations is performed, and the hot water recovery is completed.
[0135]
As described above in detail, according to the engine cooling device of the second embodiment, in addition to the effects (1) to (4) of the first embodiment, The effect shown can be obtained.
[0136]
(5) In the present embodiment, when the hot water is not collected into the heat storage container 16 during the operation of the engine E, the heat storage passage is connected to the cooling circuit after the engine E is stopped, and the electric water pump 15 The cooling water is circulated through. As described above, when the hot water is not collected into the heat storage container 16 during the operation of the engine E, the hot water is collected while the engine E is stopped. Can be recovered.
[0137]
(6) In the present embodiment, when the hot water is collected into the heat storage container 16 while the engine E is stopped, the bypass passage is closed. In this way, by closing the bypass passage when collecting the hot water, the flow rate of the hot water flowing into the heat storage container 16 is increased, so that the hot water can be collected efficiently.
[0138]
(7) In the present embodiment, when the hot water is collected into the heat storage container 16 while the engine E is stopped, the throttle passage and the heater passage are closed. Thus, by closing each of these cooling passages, the flow rate of the hot water flowing into the heat storage container 16 is increased during the recovery of the hot water, so that the recovery efficiency of the hot water can be further improved. It becomes like this.
[0139]
In addition, the said 2nd Embodiment can also be implemented as the following forms which changed this suitably, for example.
In the second embodiment, the “hot water recovery process while the engine is stopped” (FIG. 7) is started when the engine E is stopped. However, for example, the following modifications can be made. . That is, the “warm water recovery process while the engine is stopped” can be started after a predetermined period has elapsed since the engine E was stopped.
[0140]
In the second embodiment, the hot water is collected into the heat storage container 16 through the “hot water recovery process while the engine is stopped”. However, the configuration of the “hot water recovery process while the engine is stopped” is the above configuration. The configuration is not limited to the configuration exemplified in the second embodiment. In short, on the condition that hot water is not collected during operation of the engine E, the control mode in which the hot water is collected with the bypass passage closed while the engine E is stopped is “the engine is stopped. The control mode of “warm water recovery process” can be changed as appropriate.
[0141]
(Third embodiment)
A third embodiment of the present invention will be described with reference to FIGS.
[0142]
The configuration of the present embodiment is basically the same as the configuration of the first embodiment, but it is possible to further improve the recovery efficiency of hot water through control of the open / close state of the radiator passage. ing.
[0143]
First, the configuration of the entire apparatus will be described with reference to FIG.
The configuration of the engine cooling apparatus 1 in the present embodiment is modified as follows from the apparatus of the first embodiment.
[0144]
That is, as shown in the broken line, the second flow rate control valve 25 is provided in the radiator passage.
The second flow rate control valve 25 can continuously change the opening degree of the valve from the minimum opening degree (fully closed) to the maximum opening degree (fully opened).
[0145]
By performing the valve closing control of the second flow rate control valve 25, the radiator passage can be closed regardless of the operating state of the thermostat 21. The second flow control valve 25 is also controlled through the ECU 3.
[0146]
In the present embodiment, in response to the above change, during the operation of the engine E, the “engine operation” described below is used instead of the “warm water recovery process during engine operation” (FIG. 2) of the first embodiment. The “warm water recovery process” (FIG. 12) is performed.
[0147]
[Warm water recovery process during engine operation]
With reference to FIG. 12, the “warm water recovery process during engine operation” will be described.
This process is started after the warm-up of the engine E is completed, and is ended after the processes of steps S301 to S306 described below are performed.
[0148]
[Step S301] The same processing as in step S101 (FIG. 2) is performed.
[Step S302] The same processing as in step S102 (FIG. 2) is performed.
[Step S303] When there is a heater request (when the heater request flag exHC is “ON”), the following operations [a] to [d] are performed.
[A] All ports of the three-way valve 24 are opened.
[B] The flow control valve 22 is fully closed.
[C] The on-off valve 23 is closed.
[D] The second flow control valve 25 is fully closed.
[0149]
Through each of these operations, the heat storage passage and the heater passage are connected to the cooling circuit (the heat storage passage and the heater passage are opened), while the radiator passage, the bypass passage, and the throttle passage are closed.
[0150]
Thereby, since the cooling water circulates through the heat storage circuit, the hot water flowing out from the engine E flows into the heat storage container 16. That is, the hot water is recovered into the heat storage container 16.
[0151]
Further, since the cooling water circulates through the heater circuit, the hot water flowing out from the engine E flows into the heater core 14.
[Step S304] When the heater request flag exHC is “off”, the following operations [a] to [e] are performed.
[A] The first port P1 and the third port P3 of the three-way valve 24 are opened.
[B] The second port P2 of the three-way valve 24 is closed.
[C] The flow control valve 22 is fully closed.
[D] The on-off valve 23 is closed.
[E] The second flow control valve 25 is fully closed.
[0152]
Through each of these operations, the heat storage passage is connected to the cooling circuit (the heat storage passage is opened), while the radiator passage, the bypass passage, the throttle passage, and the heater passage are closed.
[0153]
Thereby, since the cooling water circulates through the heat storage circuit, the hot water flowing out from the engine E is recovered into the heat storage container 16.
[Step S305] The same processing as in step S105 (FIG. 2) is performed.
[0154]
[Step S306] When the hot water recovery period Pww becomes equal to or longer than the predetermined recovery period PwwX, the third port P3 of the three-way valve 24 is closed and the second flow rate control valve 25 is opened.
[0155]
Through this operation, the heat storage passage is disconnected from the cooling circuit, while the radiator passage is opened.
Thus, according to the hot water recovery process during engine operation, hot water is recovered in the following modes [D] and [E].
[D] When the engine water temperature THwe is equal to or higher than the hot water recovery determination temperature THwX and the heater request flag exHC is “on”, the heat storage passage and the heater passage are maintained in a state of being connected to the cooling circuit, while the radiator passage, the bypass passage, The hot water is collected while the throttle passage is closed.
[E] When the engine water temperature THwe is equal to or higher than the hot water recovery determination temperature THwX and the heater request flag exHC is “off”, the heat storage passage is maintained in a state connected to the cooling circuit, while the radiator passage, the bypass passage, the throttle passage, In addition, the hot water is collected while the heater passage is closed.
[0156]
Here, with reference to FIG. 13, the control mode of the engine cooling device 1 by the hot water recovery process during engine operation (FIG. 12) will be summarized.
When the engine coolant temperature THwe is equal to or higher than the warm water recovery determination temperature THwX and the heater request flag exHC is “ON”, the engine cooling device 1 is controlled in the following modes [D1] to [D5].
[D1] The flow control valve 22 is fully closed.
[D2] The on-off valve 23 is closed.
[D3] All the ports of the three-way valve 24 are opened.
[D4] The second flow control valve 25 is fully closed.
[D5] The electric water pump 15 is stopped.
[0157]
When the engine water temperature THwe is equal to or higher than the hot water recovery determination temperature THwX and the heater request flag exHC is “off”, the engine cooling device 1 is controlled in the following modes [E1] to [E6].
[E1] The flow control valve 22 is fully closed.
[E2] The on-off valve 23 is opened.
[E3] The first port P1 and the third port P3 of the three-way valve 24 are opened.
[E4] The second port P2 of the three-way valve 24 is closed.
[E5] The second flow control valve 25 is fully closed.
[E6] The electric water pump 15 is stopped.
[0158]
Incidentally, the thermostat 21 is maintained at an opening degree corresponding to the temperature of the cooling water.
In the operation state other than the above, the flow rate control valve 22, the on-off valve 23, the three-way valve 24, the second flow rate control valve 25, and the electric water pump 15 are subjected to the operation state of the engine E by a separate process. Controlled.
[0159]
Next, with reference to FIG.14 and FIG.15, the circulation aspect of the cooling water at the time of hot water collection | recovery is demonstrated. 14 and 15, the cooling passages indicated by solid lines indicate passages through which cooling water flows, the arrows indicate the direction of cooling water flow, and the cooling passages indicated by broken lines indicate passages through which cooling water does not flow. .
[0160]
[Cooling water circulation mode [4]]
Referring to FIG. 14, the cooling water circulation mode when “the engine water temperature THwe is equal to or higher than the hot water recovery determination temperature THwX and the heater request flag exHC is“ ON ”” will be described.
[0161]
At this time, since the heat storage passage and the heater passage are connected to the cooling circuit, the cooling water circulates through the first cooling passage R1, the heat storage passage, the heater passage, and the second cooling passage R2.
[0162]
On the other hand, since the radiator passage, the bypass passage, and the throttle passage are closed, the cooling water does not flow through these cooling passages.
[Cooling water circulation mode [5]]
Referring to FIG. 15, the cooling water circulation mode when “the engine water temperature THwe is equal to or higher than the hot water recovery determination temperature THwX and the heater request flag exHC is“ off ”” will be described.
[0163]
At this time, since the heat storage passage is connected to the cooling circuit, the cooling water circulates through the first cooling passage R1 and the heat storage passage.
On the other hand, since the radiator passage, the bypass passage, the throttle passage, and the heater passage are closed, the cooling water does not flow through these cooling passages.
[0164]
Next, the effect obtained by the hot water recovery process during engine operation (FIG. 12) will be described.
In this process, when the engine water temperature THwe is equal to or higher than the hot water recovery determination temperature THwX, the hot water is recovered with the radiator passage, the bypass passage, and the throttle passage closed.
[0165]
As described above, when the hot water flowing out from the engine E is collected in the heat storage container 16, the flow rate of the hot water flowing into the heat storage container 16 is further increased through the closing of the radiator passage. The efficiency can be further improved.
[0166]
Next, with reference to FIG. 16, an example of the hot water recovery mode by the “hot water recovery process during engine operation” will be described.
It is assumed that the heater request flag exHC is turned “ON” at time t161 (FIG. 16: [b]).
[0167]
At this time, the heater passage is opened (FIG. 16: [d]).
Assume that the engine water temperature THwe becomes equal to or higher than the hot water recovery determination temperature THwX at time t162 (FIG. 16: [a]).
[0168]
At this time,
[C] Open the heat storage passage (connect the heat storage passage to the cooling circuit).
[D] The connection state between the heater passage and the cooling circuit is maintained.
[E] The radiator passage is closed.
[F] Keep the bypass passage closed.
[G] Keep the throttle passage closed.
Each of the above operations is performed.
[0169]
Thereby, since the cooling water is circulated through the heat storage circuit and the heater circuit, the hot water is collected into the heat storage container 16, and the heating performance of the heater 14H is prevented from being lowered.
[0170]
It is assumed that the hot water recovery period Pww becomes equal to or longer than the predetermined recovery period PwwX at time t163.
At this time,
[C] Close the heat storage passage (cut the heat storage passage from the cooling circuit).
[E] Open the radiator passage (open the second flow control valve 25).
Each of the above operations is performed.
[0171]
Thereafter, the open / closed state of each cooling passage is controlled according to the operating state of the engine E and the like.
As described above in detail, the engine cooling apparatus according to the third embodiment has the following effects in addition to the effects (1) to (4) according to the first embodiment. The effect shown can be obtained.
[0172]
(8) In the present embodiment, when the engine water temperature THwe is equal to or higher than the hot water recovery determination temperature THwX, the radiator passage, the bypass passage, and the throttle passage are closed.
[0173]
As described above, when the hot water flowing out from the engine E is collected in the heat storage container 16, the flow rate of the hot water flowing into the heat storage container 16 is further increased through the closing of the radiator passage. The efficiency can be further improved.
[0174]
Note that the third embodiment can be implemented as an appropriate modification of the above, for example, as follows.
It is also possible to apply the previous second embodiment to the third embodiment. That is, in the third embodiment, the “warm water recovery process while the engine is stopped” (FIG. 7) can be performed while the engine E is stopped.
[0175]
In the above modification, when collecting the hot water while the engine E is stopped, the radiator passage can be closed through the closing of the second flow rate control valve 25. When such a configuration is adopted, it is possible to accurately close the radiator passage when the hot water is recovered while the engine E is stopped, so that the hot water can be recovered more suitably.
[0176]
In the third embodiment, in step S302 of “warm water recovery process during engine operation” (FIG. 12), the presence / absence of a heater request is determined and the opening / closing state of the heater passage is switched according to the determination result. However, it can be changed as follows, for example. In other words, the processing of steps S302 and S304 is omitted, and when the engine water temperature THwe is equal to or higher than the hot water recovery determination temperature THwX, the hot water can be recovered through the processing after step S303.
[0177]
In the third embodiment, when the hot water recovery period Pww is less than the predetermined recovery period PwwX in step S305 of “warm water recovery process during engine operation” (FIG. 12), the determination process in step S305 is Although it is configured so as to be repeatedly executed for each cycle, it can be changed as follows, for example. That is, when the hot water recovery period Pww is less than the predetermined recovery period PwwX, the “hot water recovery process during engine operation” can be restarted from step S301 or step S302.
[0178]
In the third embodiment, the “warm water recovery process during engine operation” is started after the warm-up of the engine E is completed. The start time of the process is illustrated in the third embodiment. The start time is not limited to this, and can be changed as appropriate.
[0179]
In the third embodiment, after performing the processing of steps S301 to S306, the “warm water recovery processing during engine operation” is terminated. However, for example, the following modifications can be made. . That is, the process can be resumed after the “hot water recovery process during engine operation” is completed. In addition, when the elapsed period from the end of the “hot water recovery process during engine operation” becomes equal to or longer than a predetermined period, the process can be resumed.
[0180]
In the third embodiment, when the engine water temperature THwe is equal to or higher than the hot water recovery determination temperature THwX, the heat storage passage is opened and the hot water is recovered. However, when the hot water is recovered, the electric water pump 15 is driven. Thereby, the recovery efficiency of warm water can be further improved.
[0181]
In the third embodiment, the second flow rate control valve 25 is provided in the radiator passage. However, in place of the second flow rate control valve 25, the open / close valve can be switched to either open or closed. Can also be provided in the radiator passage.
[0182]
(Fourth embodiment)
A fourth embodiment embodying the present invention will be described with reference to FIGS. In addition, since the structure of the whole apparatus in this Embodiment is the same as that of the said 1st Embodiment, the overlapping description is omitted.
[0183]
By the way, at the time of high load operation of the engine E, the cooling water for cooling the engine E becomes extremely high, and the cooling performance of the engine E is lowered.
For this reason, it is conceivable to retard the ignition timing in order to avoid an overheating state of the engine E during high load operation of the engine E. It becomes like a twist.
[0184]
Therefore, in the present embodiment, the “engine cooling process” described below is performed, so that the engine overheat state can be avoided while maintaining the engine performance during the high load operation of the engine.
[0185]
In the present embodiment, the “engine cooling process” (FIG. 17) is performed in parallel with the “hot water recovery process during engine operation” (FIG. 2).
[Engine cooling process]
The “engine cooling process” will be described with reference to FIG. This process is repeatedly executed at predetermined intervals while the engine E is operating.
[0186]
[Step S401] It is determined whether the engine coolant temperature THwe is equal to or higher than the overheat determination temperature THwH. That is, the following conditions
THwe ≧ THwH
It is determined whether or not is satisfied.
[0187]
The overheat determination temperature THwH is used as a threshold value for the engine water temperature that indicates whether or not the engine E may be in an overheated state. That is, when the engine water temperature THwe is equal to or higher than the overheat determination temperature THwX, the engine E may be overheated.
[0188]
Incidentally, the overheat determination temperature THwH can be set, for example, as a temperature obtained by adding a predetermined value to the temperature at which the thermostat 21 opens (thermostat valve opening temperature THts). That is, the following formula
THwH = THts + α
It is possible to set through.
[0189]
[Step S402] When the engine coolant temperature THwe is equal to or higher than the overheat determination temperature THwH, the following operations [a] to [c] are performed.
[A] Fully open the flow control valve 22.
[B] The on-off valve 23 is opened.
[C] All the ports of the three-way valve 24 are opened.
[0190]
Through these operations, the bypass passage, the throttle passage, the heater passage, and the heat storage passage are opened.
As a result, the cooling water circulates through all the cooling passages of the engine cooling device 1.
[0191]
The process of step S402 is performed with priority over the control of each control valve by the “warm water recovery process during engine operation” (FIG. 2). That is, even if the flow control valve 22, the on-off valve 23, and the three-way valve 24 (second port P2) are closed through the “warm water recovery process during engine operation”, the process of step S402 is performed. These control valves are forcibly opened.
[0192]
[Step S403] When the engine water temperature THwe becomes lower than the overheat determination temperature THwH (or when the engine water temperature THwe is lower than the overheat determination temperature THwH), the open / close state of each control valve is controlled according to the operating state of the engine E, This process is temporarily terminated.
[0193]
Thus, according to the engine cooling process, the engine E is cooled in the following mode [F].
[F] When the engine water temperature THwe is equal to or higher than the overheat determination temperature THwH, the coolant is circulated with the bypass passage, the throttle passage, the heater passage, and the heat storage passage opened.
[0194]
Here, with reference to FIG. 18, the control mode of the engine cooling device 1 by the engine cooling process (FIG. 17) will be summarized.
When the engine coolant temperature THwe is equal to or higher than the overheat determination temperature THwH, the engine cooling device 1 is controlled in the following modes [F1] to [F4].
[F1] The flow control valve 22 is fully opened.
[F2] The on-off valve 23 is opened.
[F3] All the ports of the three-way valve 24 are opened.
[F4] The electric water pump 15 is stopped.
[0195]
Incidentally, the thermostat 21 is maintained at an opening degree corresponding to the temperature of the cooling water.
In the operation state other than the above, the flow rate control valve 22, the on-off valve 23, the three-way valve 24, and the electric water pump 15 are controlled according to the operation state of the engine E by a separate process.
[0196]
Next, the cooling mode of the engine E will be described with reference to FIG. In FIG. 19, a cooling passage indicated by a solid line indicates a passage through which cooling water flows, and an arrow indicates the direction of the cooling water flow.
[0197]
[Cooling water circulation mode [6]]
When the engine water temperature THwe is equal to or higher than the overheat determination temperature THwH, the radiator passage, the bypass passage, the throttle passage, the heater passage, and the heat storage passage are open.
[0198]
For this reason, the cooling water is circulated through the first cooling passage R1, the radiator passage, the bypass passage, the throttle passage, the heater passage, the heat storage passage, and the second cooling passage R2.
[0199]
Next, the operational effects achieved by the engine cooling process (FIG. 17) will be described.
In this process, when the engine water temperature THwe is equal to or higher than the overheat determination temperature THwH, all the cooling passages that can be opened and closed are opened through the control of the control valve.
[0200]
Thus, when the engine E may fall into an overheated state, the flow rate of the cooling water circulated through the engine E is increased by opening the cooling passages. An overheating state is preferably avoided.
[0201]
Further, since the cooling water is circulated through the heater passage, heat exchange is performed between the cooling water and the air for heating the vehicle interior in the heater core 14, so that the cooling performance of the engine E is further improved. Become.
[0202]
Further, since the cooling performance is improved through the opening / closing control of the cooling passage, the engine performance is suitably maintained.
Next, an example of the engine cooling mode by the “engine cooling process” will be described with reference to FIG.
[0203]
Assume that the engine water temperature THwe becomes equal to or higher than the overheat determination temperature THwH at time t201 (FIG. 20: [a]).
At this time,
[B] Open the bypass passage.
[C] Open the throttle passage.
[D] Open the heater passage.
[E] Open the heat storage passage.
Each of the above operations is performed.
[0204]
Accordingly, the cooling water is circulated through the bypass passage, the throttle passage, the heater passage, and the heat storage passage in accordance with the radiator passage, so that the cooling performance of the engine E is improved.
[0205]
It is assumed that the engine water temperature THwe becomes lower than the overheat determination temperature THwH at time t202 (FIG. 20: [a]).
At this time, each cooling passage is opened and closed according to the operating state of the engine E (FIG. 20: [b] to [e]).
[0206]
As described above in detail, according to the engine cooling device of the fourth embodiment, in addition to the effects (1) to (4) of the first embodiment, The effect shown can be obtained.
[0207]
(9) In the present embodiment, when the engine water temperature THwe is equal to or higher than the overheat determination temperature THwH, the bypass passage, the throttle passage, the heater passage, and the heat storage passage are opened. In this way, when the engine E may fall into an overheated state, the flow rate of the cooling water circulating through the engine E is increased by opening these cooling passages. An overheated state can be suitably avoided.
[0208]
(10) Further, since the cooling water is circulated through the heater passage, heat is further exchanged between the cooling water and the vehicle interior heating air in the heater core 14, thereby further improving the cooling performance of the engine E. Can be improved.
[0209]
(11) Further, since the cooling performance is improved through the opening / closing control of the cooling passage, the engine performance can be suitably maintained.
In addition, the said 4th Embodiment can also be implemented as the following forms which changed this suitably, for example.
[0210]
The above fourth embodiment can be applied to the second embodiment. That is,
[I] "Warm water recovery process during engine operation (Fig. 2)"
[B] "Warm water recovery process while the engine is stopped (Fig. 7)"
[C] "Engine cooling process (Fig. 17)"
These processes can also be performed together.
[0211]
It is possible to apply the fourth embodiment to the third embodiment. That is,
[I] "Warm water recovery process during engine operation (Fig. 12)"
[B] "Engine cooling process (Fig. 17)"
These processes can also be performed together. In accordance with this, it is also possible to perform “warm water recovery processing while the engine is stopped (FIG. 7)”.
[0212]
In the fourth embodiment, when the engine water temperature THwe is equal to or higher than the overheat determination temperature THwH, the bypass passage, the throttle passage, the heater passage, and the heat storage passage are opened to cool the engine E. The cooling performance of the engine E can be further improved by driving the electric water pump 15 when the engine E is cooled.
[0213]
In the fourth embodiment, the engine E is cooled through the “engine cooling process”. However, the configuration of the “engine cooling process” is limited to the structure illustrated in the fourth embodiment. It is not something that can be done. In short, when the engine E is likely to be overheated during operation of the engine E, any control mode that can improve the cooling performance of the engine E through switching of the open / close state of the cooling passage is referred to as “engine cooling processing”. The control mode can be appropriately changed.
[0214]
(Other embodiments)
Other elements that can be changed in common with the above-described embodiments include the following.
[0215]
In each of the above-described embodiments, the thermostat 21 that operates according to the temperature of the cooling water is used. However, for example, the following modifications can be made. That is, an electronic thermostat that can electrically control the open / close state of the valve can also be used.
[0216]
In each of the above embodiments, the opening / closing valve 23 is provided in the throttle passage. However, for example, the following modifications can be made. That is, a flow rate control valve capable of continuously changing the opening degree of the valve can be provided instead of the on-off valve 23.
[0217]
In each of the above embodiments, the flow control valve 22 is provided in the bypass passage. However, for example, the following change may be made. That is, an on-off valve that can be switched to either open or closed can be provided instead of the flow control valve 22.
[0218]
In each of the above embodiments, the opening and closing states of the heater passage and the heat storage passage are switched through the control of the three-way valve 24. However, for example, the following changes may be made. That is, an on-off valve or a flow rate control valve is provided in each of the heater passage and the heat storage passage, and the opening and closing states of the heater passage and the heat storage passage can be switched through control of the provided control valve.
[0219]
In each of the above embodiments, the engine cooling device 1 is assumed in which a cooling circuit is configured including the first cooling passage R1, the radiator passage, the bypass passage, the throttle passage, and the second cooling passage R2. The configuration is not limited to the configuration illustrated in the above embodiments, and can be changed as appropriate.
[0220]
In each of the above embodiments, the present invention has been embodied assuming the engine cooling device 1 illustrated in FIG. 1 (FIG. 11), but the configuration of the engine cooling device is the same as that illustrated in each of the above embodiments. An appropriate configuration can be adopted without limitation. In short, a cooling device having an arbitrary configuration is adopted as long as it is an engine cooling device including a cooling circuit including a radiator passage, a bypass passage, and a flow rate control valve 22 and a heat storage circuit provided with a heat storage container 16. can do.
[0221]
In each of the above embodiments, the hot water is collected into the heat storage container 16 through the “hot water recovery process during engine operation”, but the configuration of the “hot water recovery process during engine operation” is as described above. It is not restricted to the structure illustrated with the form of. In short, if the control mode is such that when the temperature of the cooling water flowing out from the engine E is equal to or higher than a predetermined temperature, the bypass passage is closed and the hot water is recovered, the configuration of the “hot water recovery process during engine operation” is changed as appropriate. Is possible.
[Brief description of the drawings]
FIG. 1 is a schematic diagram schematically showing the overall configuration of a first embodiment that embodies an engine cooling apparatus according to the present invention.
FIG. 2 is a flowchart showing “hot water recovery processing during engine operation” performed in the embodiment;
FIG. 3 is a view showing a control mode of the engine cooling device by “hot water recovery processing during engine operation” performed in the embodiment.
FIG. 4 is a diagram showing a cooling water circulation mode (cooling water circulation mode [1]) during hot water recovery during engine operation in the engine cooling device of the embodiment;
FIG. 5 is a view showing a cooling water circulation mode (cooling water circulation mode [2]) during hot water recovery during engine operation in the engine cooling device of the embodiment;
FIG. 6 is a timing chart showing a hot water recovery mode (hot water recovery mode [1]) by “hot water recovery process during engine operation” in the engine cooling device of the embodiment;
FIG. 7 is a flowchart showing a “hot water recovery process while the engine is stopped” performed in the second embodiment that embodies an engine cooling device according to the present invention;
FIG. 8 is a view showing a control mode of the engine cooling device by “hot water recovery processing while the engine is stopped” performed in the embodiment;
FIG. 9 is a view showing a cooling water circulation mode (cooling water circulation mode [3]) when hot water is recovered while the engine is stopped in the engine cooling device according to the embodiment;
FIG. 10 is a timing chart showing a hot water recovery mode (hot water recovery mode [2]) by “hot water recovery process while the engine is stopped” in the engine cooling device of the embodiment;
FIG. 11 is a schematic diagram schematically showing the overall configuration of a third embodiment of the engine cooling device according to the present invention.
FIG. 12 is a flowchart showing “hot water recovery processing during engine operation” performed in the embodiment;
FIG. 13 is a view showing a control mode of the engine cooling device by “hot water recovery processing during engine operation” performed in the embodiment.
FIG. 14 is a diagram showing a cooling water circulation mode (cooling water circulation mode [4]) during hot water recovery during engine operation in the engine cooling device of the embodiment;
FIG. 15 is a view showing a cooling water circulation mode (cooling water circulation mode [5]) during hot water recovery during engine operation in the engine cooling device of the embodiment;
FIG. 16 is a timing chart showing a hot water recovery mode (hot water recovery mode [3]) by “hot water recovery process during engine operation” in the engine cooling device of the embodiment;
FIG. 17 is a flowchart showing an “engine cooling process” performed in the fourth embodiment that embodies an engine cooling device according to the present invention;
FIG. 18 is a diagram showing a control mode of the engine cooling device by “engine cooling processing” performed in the embodiment;
FIG. 19 is a diagram showing a cooling water circulation mode (cooling water circulation mode [6]) during engine cooling in the engine cooling device according to the embodiment;
FIG. 20 is a timing chart showing how the engine is cooled by “engine cooling processing” in the engine cooling device of the embodiment;
[Explanation of symbols]
E ... Engine, 1 ... Engine cooling device, 11 ... Water pump, 12 ... Radiator, 13 ... Throttle body, 14 ... Heater core, 14H ... Heater, 15 ... Electric water pump, 16 ... Heat storage container, 17 ... Delivery pipe for cooling water 21 ... Thermostat, 22 ... Flow control valve, 23 ... Open / close valve, 24 ... Three-way valve, P1 ... First port, P2 ... Second port, P3 ... Third port, 25 ... Second flow control valve, 3 ... ECU, S1 ... engine water temperature sensor, S2 ... heat storage container water temperature sensor, R1 ... first cooling passage, R2 ... second cooling passage, R3 ... third cooling passage, R4 ... fourth cooling passage, R5 ... fifth cooling passage, R6 ... 6th cooling passage, R7 ... 7th cooling passage, R8 ... 8th cooling passage, R9 ... 9th cooling passage, R10 ... 10th cooling passage, R11 ... 11th cooling passage, R12 ... 12th cooling passage , R13 ... 13 cooling passage, R14 ... 14 cooling passage.

Claims (6)

A radiator passage for allowing refrigerant flowing out of the main body of the engine to flow into the main body of the engine via a radiator, and a bypass for allowing refrigerant flowing out of the main body of the engine to flow into the main body of the engine without passing through the radiator A cooling circuit configured to include a passage and a first control valve for controlling the flow rate of the refrigerant flowing through the bypass passage, and a heat storage container for keeping and storing the refrigerant flowing out from the main body of the engine. A heat storage passage that constitutes a heat storage circuit for circulating the refrigerant through the main body of the engine and the heat storage container by being selectively connected to a cooling circuit, and after warming up the engine, the first A cooling device for the engine which causes the refrigerant flowing out from the main body of the engine to flow through the bypass passage by opening the control valve. In,
An engine comprising: control means for closing the first control valve and allowing the refrigerant to flow into the heat storage container when the temperature of the refrigerant flowing out of the main body of the engine is equal to or higher than a predetermined temperature. Cooling system. The engine cooling device according to claim 1,
The cooling circuit is configured to further include a second control valve that controls the flow rate of the refrigerant flowing through the radiator passage,
The control means closes the first control valve and closes the second control valve when the refrigerant flowing out of the main body of the engine flows into the heat storage container. apparatus. The engine cooling device according to claim 1 or 2,
The control means is configured to close the first control valve while the engine is stopped when the refrigerant that has flowed out of the main body of the engine during operation of the engine cannot be recovered into the heat storage container. A cooling device for an engine, characterized in that a refrigerant flowing out of the main body flows into the heat storage container. The engine cooling apparatus according to claim 3.
The engine cooling device is provided with a heater core for exchanging heat between the refrigerant flowing out of the main body of the engine and the air for heating the vehicle interior, and is selectively connected to the cooling circuit to thereby remove the refrigerant. A heater passage that constitutes a heater circuit for circulating through the main body of the engine and the heater core;
The control means controls a connection mode of the heater passage to the cooling circuit, and when the refrigerant flowing out from the main body of the engine flows into the heat storage container during operation of the engine, the heater passage is connected to the cooling circuit. The engine cooling device characterized in that the heater passage is disconnected from the cooling circuit when the refrigerant flowing out from the engine main body flows into the heat storage container while the engine is stopped while maintaining the connected state. . The engine cooling device according to claim 4,
The control means cools the heater passage on the condition that when the refrigerant flowing out of the main body of the engine flows into the heat storage container during operation of the engine, there is a request for the refrigerant to flow into the heater core. An engine cooling apparatus characterized in that the heater passage is disconnected from the cooling circuit when the condition is not satisfied while maintaining the state connected to the circuit. The engine cooling device according to any one of claims 1 to 5,
The cooling circuit includes a throttle passage for allowing refrigerant flowing out from the main body of the engine to flow into the main body of the engine through the throttle body, and an opening / closing valve for opening and closing the throttle passage,
The engine cooling device is characterized in that the control means closes the on-off valve when the first control valve is closed and the refrigerant flowing out of the main body of the engine flows into the heat storage container.

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