JP6738237B2 - Cooling system - Google Patents

Description

The present invention relates to a cooling device in which cooling water is circulated in various parts.

Conventionally, an electronic control valve is provided in the return pipe that connects the water jacket of the cylinder block and the radiator, and the electronic control valve is closed during engine warm-up to prevent cooling water from flowing into the radiator. A cooling device for early warm-up has been proposed (for example, Patent Document 1).

In the cooling device described in Patent Document 1, when the cooling water is poured from the outside, the electronic control valve is opened to prevent air from being accumulated in the cooling flow path.

Japanese Patent No. 4968095

However, in a cooling device provided with an electronic control valve to which a plurality of cooling flow paths for discharging cooling water are connected, even if the electronic control valve is opened for all cooling flow paths, any cooling flow path Since air remained inside, it was difficult to remove the air from all the cooling channels.

Therefore, an object of the present invention is to provide a cooling device that can efficiently remove air from the inside of a cooling flow path.

In order to solve the above-mentioned problems, the cooling device of the present invention is connected to a plurality of cooling flow paths through which cooling water is discharged, and an electronic control valve capable of opening and closing each of the plurality of cooling flow paths; A control unit that controls the electronic control valve so that one of the plurality of cooling flow channels sequentially opens in sequence when cooling water is injected into the flow channel; Is a radiator flow path connected to a radiator that cools the cooling water, a heater flow path that is connected to a heater that warms the air inside the vehicle, and a bypass flow that bypasses the radiator while the cooling water that has flowed through the engine flows in. A passage is connected, and the control unit periodically opens the bypass passage, the heater passage, and the radiator passage in this order .

Further, the heater may be provided vertically above the bypass flow passage.

According to the present invention, air can be efficiently extracted from the cooling flow passage.

It is a figure explaining the structure of the cooling device of a vehicle. It is a figure explaining the positional relationship of an engine, a water pump, an electronic control valve, a radiator, a bypass channel, and a heater. It is a figure which shows the relationship of the rotation angle of a rotary in an electronically controlled valve, and an aperture ratio. It is a sequence chart which shows the flow of a water injection processing procedure. It is a flow chart which shows a flow of valve control processing.

Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings. The dimensions, materials, and other specific numerical values shown in the embodiments are merely examples for facilitating understanding of the invention, and do not limit the invention unless otherwise specified. In this specification and the drawings, elements having substantially the same function and configuration are denoted by the same reference numerals to omit redundant description, and elements not directly related to the present invention are omitted. To do.

FIG. 1 is a diagram illustrating a configuration of a vehicle cooling device 1. FIG. 2 is a diagram illustrating a positional relationship among the engine 2, the water pump 10, the electronic control valve 20, the radiator 22, the bypass flow passage 40g, and the heater 24. In FIG. 1, the cooling flow path 40 is shown by a solid arrow, and the signal flow is shown by a broken line. Further, in FIG. 2, only parts particularly relevant in the water injection treatment procedure described later are shown, and other parts are omitted.

As shown in FIG. 1, the cooling device 1 includes a water pump 10, an engine 2 (oil pan upper 12, cylinder block 14, cylinder head 16), a water transfer pipe 18, an electronic control valve 20, a radiator 22, a heater 24, an EGR. A cooler 26, a transmission 28, a water delivery pipe 30, a thermostat valve 32, an ECU 34 (control unit), and temperature sensors T1 to T3 are provided. Then, in the cooling device 1, the cooling water is circulated to each of these parts via the cooling flow path 40 (40a to 40i).

The water pump 10 is provided vertically below the engine 2 (FIG. 2 ), and is connected with a pump discharge passage 40a, a radiator passage 40e, a heater passage 40f, and a bypass passage 40g. The water pump 10 is driven by the rotational power of the engine 2 and discharges the cooling water flowing from the radiator flow passage 40e, the heater flow passage 40f, and the bypass flow passage 40g to the pump discharge flow passage 40a.

The oil pan upper 12 is connected to the pump discharge passage 40a and the block inflow passage 40b. In the oil pan upper 12, the cooling water that has flowed in from the water pump 10 temporarily flows in via the pump discharge flow channel 40a, and the inflowing cooling water is discharged to the block inflow flow channel 40b.

The engine 2 is a so-called horizontally opposed engine that includes a pair of cylinder blocks 14 and a pair of cylinder heads 16 and is arranged so that the pair of cylinder blocks 14 oppose each other in a substantially horizontal direction. The drive torque of the engine 2 is shifted by the transmission 28 and transmitted to the wheels.

The cylinder block 14 is provided with a branch chamber 14a for branching the cooling water to the cylinder block 14 and the cylinder head 16. Further, a water jacket through which cooling water flows is formed in the cylinder block 14 and the cylinder head 16. Although the pair of cylinder blocks 14 and the pair of cylinder heads 16 are illustrated as being separated from each other in FIG. 1, in practice, the pair of cylinder blocks 14 are connected so as to face each other. In addition, the cylinder heads 16 are connected to the cylinder blocks 14, respectively.

The cylinder block 14 is located on the downstream side of the branch chamber 14a and is connected to a block discharge passage 40c through which the cooling water flowing through the water jacket is discharged. The cylinder head 16 has a water jacket connected to the branch chamber 14a and is reconnected to the cylinder block 14 on the downstream side.

Then, the cooling water flowing into the branch chamber 14a flows through the water jacket of the cylinder block 14 and is discharged to the block discharge flow passage 40c, and also flows through the water jacket of the cylinder head 16 and is discharged to the block discharge flow passage 40c. To be done.

The water delivery pipe 18 is connected to the block discharge passage 40c and the valve inflow passage 40d, and discharges the cooling water that has flowed in from the block discharge passage 40c to the valve inflow passage 40d. That is, the water delivery pipe 18 causes the cooling water flowing through the engine 2 to flow into the electronic control valve 20.

The electronic control valve 20 is a rotary valve that is provided vertically above the engine 2 (FIG. 2), and is connected to the valve inflow passage 40d, the radiator passage 40e, the heater passage 40f, and the bypass passage 40g. The electronic control valve 20 can open and close each of the radiator flow passage 40e, the heater flow passage 40f, and the bypass flow passage 40g by rotating the rotary, as described in detail later.

The radiator 22 is provided on the front side of the engine 2 and at substantially the same height as the engine 2 in the vertical direction (FIG. 2). Further, the radiator 22 is provided in the middle of the radiator flow path 40e, and radiates the heat of the cooling water to the outside to cool the cooling water. Further, the radiator 22 is provided with a radiator cap for opening and closing a water injection port for injecting cooling water at the upper end in the vertical direction, and the air remaining in the cooling flow passage 40 is in contact with the water injection port. Is provided with an air storage unit capable of storing the air.

The heater 24 is provided vertically above the engine 2, the electronic control valve 20, and the radiator 22 (FIG. 2). Further, the heater 24 is provided in the middle of the heater flow path 40f, and when a heater switch (not shown) is turned on, the heat of the cooling water is radiated to the inside of the vehicle to warm the inside of the vehicle.

The EGR cooler 26 is provided in the middle of the EGR passage 40h branched from the pump discharge passage 40a, and a part of the exhaust gas discharged from the engine 2 is circulated in the intake passage of the engine 2 during the EGR. Cool the exhaust gas.

The transmission 28 is, for example, a continuously variable transmission (CVT), is provided in the middle of a transmission flow passage 40i branched from the pump discharge flow passage 40a, and transmits the transmission torque transmitted from the engine 2. Stepless speed change and transmission to wheels.

The water transfer pipe 30 is provided in the middle of the bypass flow passage 40g, is connected to the EGR flow passage 40h, and is also connected to the transmission flow passage 40i via the thermostat valve 32. The water transfer pipe 30 discharges the cooling water flowing from the EGR passage 40h and the transmission passage 40i to the bypass passage 40g.

The thermostat valve 32 is connected to the transmission passage 40i and is also connected to the water delivery pipe 30. The thermostat valve 32 is in an open state in which the transmission flow passage 40i and the water delivery pipe 30 communicate with each other when the temperature of the cooling water in the transmission flow passage 40i becomes equal to or higher than a preset first temperature threshold value (for example, 50° C.). When the temperature of the cooling water in the transmission passage 40i is lower than the first temperature threshold value, the transmission passage 40i and the water delivery pipe 30 are closed.

The ECU 34 includes a semiconductor integrated flow path including a central processing unit (CPU), a ROM storing programs and the like, a RAM as a work area, and the like. Temperature sensors T1 to T3 are connected to the ECU 34, and the electronic control valve 20 is based on the signals transmitted from the temperature sensors T1 to T3 and the operating condition of the engine 2 (engine speed and engine load). To control. The ECU 34 derives the engine speed based on a signal indicating a crank angle transmitted from a crank angle sensor (not shown) provided on the crankshaft of the engine 2, and uses the throttle opening as an engine load. Derive.

The temperature sensor T1 is provided in the pump discharge passage 40a and measures the temperature of the cooling water discharged from the water pump 10 (hereinafter, also referred to as pump temperature). The temperature sensor T2 is provided in the cylinder block 14 and measures the temperature of the cooling water flowing through the water jacket of the cylinder block 14 (hereinafter, also referred to as block temperature). The temperature sensor T3 is provided in the cylinder head 16 and measures the temperature of the cooling water flowing through the water jacket of the cylinder head 16 (hereinafter also referred to as the head temperature).

The ECU 34 can communicate with the external mobile terminal 50 by wire or wirelessly. The mobile terminal 50 is a general-purpose maintenance tool that includes a semiconductor integrated flow path and includes an input device such as a keyboard in addition to a liquid crystal screen, and is connected for communication as required during maintenance.

Next, the control processing by the ECU 34 will be described. Here, first, the relationship between the rotation angle of the rotary and the aperture ratio in the electronic control valve 20 will be described, and then the control processing by the ECU 34 will be described.

FIG. 3 is a diagram showing the relationship between the rotation angle of the rotary and the aperture ratio in the electronic control valve 20. In FIG. 3, the opening ratio for the radiator flow passage 40e is shown by a broken line, the opening ratio for the heater flow passage 40f is shown by a thin line (solid line), and the opening ratio for the bypass flow passage 40g is shown by a thick line (solid line).

As shown in FIG. 3, the electronic control valve 20 can rotate the rotary in the positive direction and the negative direction with reference to the state where the rotation angle of the rotary is 0°. When the rotary angle of the electronic control valve 20 is 0° (“A” in the figure), the aperture ratios for the radiator passage 40e, the heater passage 40f, and the bypass passage 40g are all 0% ( In the closed state), the cooling water is not discharged to any of the radiator passage 40e, the heater passage 40f, and the bypass passage 40g.

Further, when the rotary of the electronic control valve 20 is rotated in the forward direction and the rotation angle is "B" in the figure, the opening ratio to the heater flow passage 40f becomes 100% (in the open state), and the heater flow passage 40f. Only the maximum flow rate of cooling water is discharged. Then, when the rotary of the electronic control valve 20 is further rotated in the forward direction and the rotation angle becomes “C” in the figure, the opening degree to the heater flow passage 40f and the bypass flow passage 40g becomes 100%, and the heater flow passage 40f and The cooling water is discharged to the bypass flow passage 40g. That is, at the rotation angle of “C” in the figure, the cooling water does not flow through the radiator flow path 40e, but the cooling water flows through the bypass flow path 40g and the bypass flow path 40g through the water transfer pipe 30. It can be said that the bypass flow passage 40g is a flow passage that bypasses the radiator 22 and circulates the cooling water.

When the rotary of the electronic control valve 20 is further rotated in the positive direction from "C" in the drawing, the opening ratio for the bypass flow passage 40g is reduced from 100% to 0% in the range of "D" in the drawing. At the same time, the aperture ratio for the radiator flow passage 40e increases from 0% to 100%. In the electronic control valve 20, the opening degree with respect to the heater channel 40f is maintained at 100% in the range of "D" in the figure. Therefore, the electronic control valve 20 discharges the cooling water to the heater flow passage 40f in the range of “D” in the drawing, and has an intermediate opening degree (depending on the opening ratio) with respect to the bypass flow passage 40g and the radiator flow passage 40e. The cooling water will be discharged. That is, the electronic control valve 20 can adjust the flow rate of the cooling water to be circulated through the radiator 22 and the bypass passage 40g in the range of "D" in the figure by the intermediate opening degree.

Further, in the electronic control valve 20, the rotary is further rotated in the positive direction from the rotation angle in the range of “D” in the drawing, and when the rotation angle of “E” in the drawing is reached, with respect to the heater flow passage 40f and the radiator flow passage 40e. The opening ratio becomes 100%, and the cooling water is discharged to the heater passage 40f and the radiator passage 40e. That is, at the rotation angle "E" in the figure, the cooling water does not flow through the bypass flow passage 40g, but the cooling water flows through the radiator flow passage 40e (radiator 22), so that the cooling water flows through the radiator 22 most. It will be distributed.

On the other hand, when the rotary of the electronic control valve 20 is rotated in the negative direction, the opening degree of the heater flow passage 40f is always 0%. Further, when the electronic control valve 20 reaches a rotation angle of “F” in the figure, the opening degree to the bypass flow passage 40g becomes 100%, and the cooling water is discharged only to the bypass flow passage 40g.

When the rotary of the electronic control valve 20 is further rotated in the negative direction from “F” in the figure, the opening ratio for the bypass flow passage 40g is reduced from 100% to 0% in the range of “G” in the figure. At the same time, the aperture ratio for the radiator flow passage 40e increases from 0% to 100%. Therefore, the electronic control valve 20 can adjust the flow rate of the cooling water to be circulated through the radiator 22 and the bypass passage 40g in the range of "G" in the figure by the intermediate opening degree.

Further, in the electronic control valve 20, when the rotary is further rotated in the negative direction from the rotation angle in the range of “G” in the figure, and when the rotation angle becomes “H” in the figure, the opening ratio to the radiator flow passage 40e is 100%. Therefore, the cooling water is discharged only to the radiator passage 40e.

In this way, the electronic control valve 20 can adjust whether or not to discharge the cooling water to the heater passage 40f, depending on whether the rotary is rotated in the positive direction or the negative direction. Further, the electronic control valve 20 can adjust the opening ratio with respect to the bypass flow passage 40g and the radiator flow passage 40e depending on the rotation angle regardless of whether the rotary is rotated in the positive direction or the negative direction. is there. That is, the electronic control valve 20 can adjust the flow rate of the cooling water flowing through the bypass passage 40g and the radiator 22 depending on the rotation angle.

Next, the control processing by the ECU 34 will be described. The ECU 34 controls the rotation angle of the rotary of the electronic control valve 20 based on the temperature of the cooling water measured by the temperature sensors T1 to T3, the engine speed, and the engine load.

Specifically, the ECU 34 acquires any one of the plurality of target temperature maps based on the head temperature measured by the temperature sensor T3. Then, the ECU 34 sets the target temperature of the cooling water flowing through the engine 2 by referring to the acquired target temperature map based on the engine speed and the engine load. Note that the target temperatures are associated with the engine speed and the engine load in the plurality of target temperature maps, and are set so that the target temperature decreases as the engine load increases.

When the target temperature is set, the ECU 34 determines the rotation angle of the rotary of the electronic control valve 20 according to the on/off of the heater switch and the set target temperature, and the electronic control valve 20( The rotary) is controlled to any state of "A" to "H" in FIG. Note that, here, the ECU 34 controls so that the cooling water does not flow through the radiator 22 as the target temperature rises, and controls so that the temperature of the cooling water rises, and as the target temperature decreases, the radiator 22 increases. The cooling water is circulated through the cooling water to control the temperature of the cooling water.

Further, the ECU 34 corrects the rotary angle of the rotary of the electronic control valve 20 based on the temperature difference between the target temperature and the head temperature. Specifically, when the temperature difference obtained by subtracting the head temperature from the target temperature is larger than 0, the ECU 34 corrects the rotation angle of the rotary so as to approach 0° as the temperature difference increases. That is, when the head temperature is lower than the target temperature, the ECU 34 controls so that the cooling water does not flow through the radiator 22 and the temperature of the cooling water rises.

When the temperature difference obtained by subtracting the head temperature from the target temperature is smaller than 0, the ECU 34 corrects the rotary angle of the rotary away from 0° as the temperature difference becomes smaller. That is, when the head temperature is higher than the target temperature, the ECU 34 causes the radiator 22 to circulate the cooling water and controls the cooling water to lower the temperature of the cooling water.

Further, the ECU 34 corrects the rotation angle of the rotary of the electronic control valve 20 based on the pump temperature measured by the temperature sensor T1. Here, the rotational angle of the rotary of the electronic control valve 20 is corrected so that the response delay of the water temperature is reduced when the target water temperature changes due to a sudden change in the engine speed or engine load.

In this way, the ECU 34 controls the rotation angle of the electronic control valve 20, that is, the opening/closing of the radiator passage 40e, the heater passage 40f, and the bypass passage 40g. For example, when the cooling water is cold, the cooling water is not circulated in the radiator 22, so that the engine 2 can be warmed up early. Further, when the cooling water is warm, it is possible to cool the cooling water, that is, the engine 2 by circulating the cooling water in the radiator 22.

By the way, in the cooling device 1, when injecting the cooling water into the cooling passage 40 at the time of manufacturing or maintenance, it is necessary to inject the cooling water so that air does not remain in the cooling passage 40. This is because if the engine 2 is driven in a state where the air remains in the cooling flow passage 40, the engine 2 may be damaged due to empty heating.

On the other hand, the electronic control valve 20 switches the three directions of the radiator passage 40e, the heater passage 40f, and the bypass passage 40g to discharge the cooling water. Therefore, if the radiator flow passage 40e, the heater flow passage 40f, and the bypass flow passage 40g are closed by the electronic control valve 20, it becomes impossible to remove the air in the cooling flow passage closed at the time of water injection.

Therefore, in the cooling device 1 of the present embodiment, the air remaining in the cooling channel 40 is efficiently discharged to the outside by the following water injection processing procedure.

FIG. 4 is a sequence chart showing the flow of the water injection process, and FIG. 5 is a flowchart showing the flow of the valve control process. When injecting the cooling water into the cooling flow passage 40, as shown in FIG. 4, the worker first injects the cooling water into the cooling flow passage 40 from the water injection port of the radiator 22 (S101). At this time, the ECU 34 maintains the electronic control valve 20 at the rotation angle "D" in FIG. 3 (S201).

As a result, in the electronic control valve 20, the radiator flow passage 40e, the heater flow passage 40f, and the bypass flow passage 40g are all opened, and the cooling water poured by the operator is passed through the radiator flow passage 40e, the heater flow passage 40f, and the bypass flow passage. It will flow into the flow channel 40g. Since the engine 2 is not driven here, the cooling water flows into the radiator passage 40e, the heater passage 40f, and the bypass passage 40g, but the air is not completely removed from the cooling passage 40. ..

Then, when the initial water injection work by the worker is completed, the portable terminal 50 transmits a water injection start instruction signal indicating that the water injection work is being performed to the ECU 34 according to the operation of the operator (S102). After that, the mobile terminal 50 or the operator starts the engine 2 (S103), and then drives the engine 2 in the racing mode of 2000 rpm to 3000 rpm (S104).

On the other hand, when receiving the water injection start instruction signal, the ECU 34 executes a valve control process for periodically switching the electronic control valve 20 while the engine 2 is being driven in the racing mode (S300).

When the ECU 34 starts the valve control process (S300), as shown in FIG. 5, the ECU 34 controls the electronic control valve 20 to the rotation angle of “F” in FIG. 3 for 2 seconds to open only the bypass flow passage 40g. (S301). Then, the cooling water is discharged only from the electronic control valve 20 to the bypass flow passage 40g, and the air remaining in the bypass flow passage 40g moves to the downstream side by the flow of the cooling water.

After that, the ECU 34 controls the electronic control valve 20 to the rotation angle of “B” in FIG. 3 for 2 seconds to open only the heater flow passage 40f (S302). Then, the cooling water is discharged only from the electronic control valve 20 to the heater passage 40f, and the air remaining in the heater passage 40f moves to the downstream side by the flow of the cooling water.

Subsequently, the ECU 34 controls the electronic control valve 20 to the rotation angle of "H" in FIG. 3 for 2 seconds to open only the radiator passage 40e (S303). Then, the cooling water is discharged only from the electronic control valve 20 to the radiator passage 40e, and the air remaining in the engine 2 and the radiator passage 40e moves to the downstream side by the flow of the cooling water. At this time, the air that has reached the radiator 22 remains in the air reservoir and is not returned to the radiator passage 40e again.

After that, the ECU 34 controls the electronic control valve 20 to the rotation angle of "D" in FIG. 3 for 2 seconds to open all the radiator flow passage 40e, the heater flow passage 40f, and the bypass flow passage 40g (S304). ), and the process returns to S301 again.

In this way, the ECU 34 controls the rotation angle of the electronic control valve 20 to be switched periodically every 2 seconds, and the cooling flow passage opened in the order of the bypass flow passage 40g, the heater flow passage 40f, and the radiator flow passage 40e. The valve control process (S300) for switching between is repeatedly executed while the engine 2 is driven in the lasing mode.

As a result, the air remaining in the bypass flow passage 40g, the heater flow passage 40f, and the radiator flow passage 40e gradually moves to the downstream side, and finally moves from the radiator flow passage 40e to the air storage portion of the radiator 22. Therefore, the air can be efficiently removed from the cooling passage 40.

At this time, among the bypass flow passage 40g, the heater flow passage 40f, and the radiator flow passage 40e connected to the electronic control valve 20, the cooling flow passage through which the cooling water flows is reduced to one, so that the cooling water is concentrated to one. It is possible to improve the dischargeability of air by flowing into the cooling flow path.

Further, since the heater 24 is provided vertically above the bypass flow passage 40g, when the heater flow passage 40f is opened before the bypass flow passage 40g, the heater flow when opening the bypass flow passage 40g. Air may return to the passage 40f. Therefore, in the present embodiment, by opening the bypass flow passage 40g before the heater flow passage 40f, it is possible to prevent air from returning to the heater flow passage 40f.

Returning to FIG. 4, after the worker drives the engine 2 in the racing mode (S104) and then stops the engine 2 (S105), the ECU 34 sets the electronic control valve 20 to the rotation angle of “D” in FIG. It is maintained (S202). As a result, in the electronic control valve 20, the radiator flow passage 40e, the heater flow passage 40f, and the bypass flow passage 40g are all opened.

Then, the worker re-injects the cooling water from the water inlet of the radiator 22 (S106), and when the procedure from S103 to S106 is not completed twice (NO in S107), the process is returned to S103. .. On the other hand, when the procedure from S103 to S106 is completed twice (YES in S107), the worker restarts the engine 2 (S108) and confirms the running noise of the cooling water flowing in the cooling flow passage 40 (S109). ). On the other hand, when the engine 2 is restarted, the ECU 34 executes the valve control process (S300) again to periodically open the bypass flow passage 40g, the heater flow passage 40f, and the radiator flow passage 40e in this order.

Then, the worker or the mobile terminal 50 determines whether or not the air remains in the cooling flow path 40 (S110). Here, when determining whether or not the air remains in the cooling flow passage 40, the determination may be made based on the flowing sound of the cooling water confirmed in S109, or the temperature of the temperature sensors T1 to T3 (constant). It may be determined by composite information including whether the temperature is equal to or higher than the temperature), the engine operating state (vehicle speed is higher than 0 km/h), and the running noise of cooling water. Then, when the air does not remain in the cooling flow path 40 (NO in S110), a water injection end instruction signal indicating that the water injection work is completed is transmitted to the ECU 34 via the portable terminal 50, and the water injection processing procedure is ended. Upon receiving the water injection end instruction signal, the ECU 34 returns the electronic control valve 20 to the normal control (S203), and ends the water injection processing procedure.

On the other hand, when the air remains in the cooling flow path 40 (YES in S110), the operator injects the cooling water into the reserve tank of the radiator 22 (S111), and the process returns to S108.

The preferred embodiments of the present invention have been described above with reference to the accompanying drawings, but it goes without saying that the present invention is not limited to such embodiments. It is obvious to those skilled in the art that various alterations or modifications can be conceived within the scope of the claims, and it should be understood that these also belong to the technical scope of the present invention. To be done.

For example, in the above-described embodiment, the case where three cooling water channels are connected to the electronic control valve 20 has been described. However, if a plurality of cooling water channels are connected to the electronic control valve 20, what is the number thereof? It may be.

Further, in the above-described embodiment, in the valve control process, the bypass flow passage 40g, the heater flow passage 40f, and the radiator flow passage 40e are cyclically switched among the cooling flow passages to be opened, but the order is not limited to this. No, it may be in any order. However, by opening the bypass flow passage 40g, the heater flow passage 40f, and the radiator flow passage 40e in this order, the air can be discharged most efficiently.

Further, in the above-described embodiment, in the valve control process, the bypass flow passage 40g, the heater flow passage 40f, and the radiator flow passage 40e, which are opened every 2 seconds, are switched in order, but the opening time of each flow passage is The period is not limited to 2 seconds and may be another period. However, even if one flow path is opened for a long time, the air will only circulate in the flow path, so it is preferable to switch the flow path within a short time.

INDUSTRIAL APPLICABILITY The present invention can be used for a cooling device in which cooling water is circulated in each part.

1 Cooling Device 2 Engine 20 Electronic Control Valve 22 Radiator 24 Heater 34 ECU (Control Unit)
40e Radiator flow passage 40f Heater flow passage 40g Bypass flow passage

Claims (2)

A plurality of cooling flow paths through which cooling water is discharged are connected, and an electronic control valve capable of opening and closing each of the plurality of cooling flow paths,
When cooling water is poured into the cooling flow passage, a control unit that controls the electronic control valve so that one of the plurality of cooling flow passages is sequentially opened periodically.
Equipped with
The electronically controlled valve is
While the cooling water that has flowed through the engine flows in, a radiator flow path connected to a radiator that cools the cooling water, a heater flow path that is connected to a heater that warms the air in the vehicle, and a bypass flow path that bypasses the radiator are provided. Connected,
The control unit is
A cooling device , wherein the bypass flow path, the heater flow path, and the radiator flow path are periodically opened in this order . The heater is
The cooling device according to claim 1 , wherein the cooling device is provided vertically above the bypass flow path.

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