JP3292217B2 - Oil temperature control device for vehicles - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a vehicular oil temperature in which an oil such as a hydraulic oil for operating a vehicle component or a lubricating oil for lubricating a sliding portion of the vehicle component is maintained at an optimum oil temperature. The present invention relates to a control device.

[0002]

2. Description of the Related Art As a prior art, Japanese Patent Application Laid-Open No. Hei 4-10902 discloses a method for controlling the temperature of hydraulic oil (hereinafter referred to as torque converter oil) for a torque converter of an automatic transmission for a vehicle.
There is a technique described in Japanese Patent Publication No. 7 (1995). This technology compares the oil temperature of the torque converter oil with the temperature of the cooling water and turns on and off the flow of the cooling water to the oil cooler by an electromagnetic valve, so that the torque converter oil when the engine is warmed up Of the torque converter oil and cooling of the torque converter oil when the oil temperature of the torque converter oil rises, so as to reduce the friction loss of the torque converter.

[0003]

However, in the prior art, a water temperature sensor and an oil temperature sensor are required, and the solenoid valve is externally controlled by a control device. There was a problem that the cost would rise. Also, since the cooling water introduced into the oil cooler is taken in from the cylinder head side of the engine, the oil-water temperature difference between the oil temperature and the water temperature is smaller than that of the conventional oil cooler with a built-in lower tank of the radiator. As a result, as indicated by the two-dot chain line a in the graph of FIG. 4, the oil temperature of the torque converter oil rises to near the allowable temperature. As a result, there has been a problem that the size of the oil cooler must be increased in order to sufficiently perform cooling when the oil temperature of the torque converter oil rises.

The present invention eliminates electrical control by a control device and reduces the number of parts, thereby reducing manufacturing costs and preventing an increase in the size of a heat exchanger. The purpose is to provide.

[0005]

SUMMARY OF THE INVENTION The invention described in claim 1 is a water-cooled engine that is cooled by the engine cooling water, the air engine coolant that has absorbed heat of the engine is heat exchanged engine A radiator for cooling the cooling water, a bypass water passage for bypassing the radiator,
Depending on the engine cooling water temperature, the air passing through the radiator
Engine cooling water flows into the engine, or
The engine cooling water that has passed through the bypass
A valve for switching whether the gas flows into the gin, a heat exchanger for exchanging heat between oil that generates heat by driving the vehicle and engine coolant, and a radiator provided in parallel with the radiator.
A first water passage for passing the engine cooling water having absorbed the heat of the engine to the heat exchanger, and a second water passage for flowing the engine cooling water cooled by the radiator to the heat exchanger.
And water passage has a sensing unit for sensing the temperature of oil flowing into the heat exchanger, when the sensed oil in this sensing unit oil temperature is low, the opening of the first water passage thereby closing the second water passage, when the oil temperature sensed oil by the sensing unit is hot, Bei example a thermostatic valve which closes the first water passage to open the second water passage, The heat exchanger
The cooling water outlet is located downstream of the valve and
Connected to a position between the gin and the upstream position
It is characterized by.

[0006]

According to the first aspect of the present invention, the cooling of the heat exchanger is performed.
The water outlet is located downstream of the valve and upstream of the engine.
Characterized by being connected to a position between
I have. And, when the engine cooling water temperature is low,
Closes and bypasses the radiator and
The engine cooling water to circulate through the engine
When the engine coolant temperature rises,
Opening the valve and circulating cooling water through the radiator to the engine
Operate to switch to ring. When the sensor of the temperature control valve detects that the oil temperature of the oil flowing into the heat exchanger is low, the temperature control valve opens the first water passage and closes the second water passage. Thus, high relatively engine coolant temperature that has absorbed the heat of the engine et
The engine cooling water is passed through the heat exchanger, and heat exchange is performed between the engine cooling water having a relatively high engine cooling water temperature and the oil having a low oil temperature in the heat exchanger to heat the oil.

When the sensor of the temperature control valve detects that the oil temperature of the oil flowing into the heat exchanger is high, the temperature control valve closes the first water passage and opens the second water passage. Thus, relatively ene cooled by the radiator
The engine cooling water with a low gin cooling water temperature is passed through the heat exchanger, and the oil temperature of the oil and the engine temperature are lower than those in which the engine cooling water that has absorbed the engine heat is directly passed through the heat exchanger.
The oil water temperature difference from the cooling water temperature increases. Therefore, the heat exchanger exchanges heat between the engine coolant having a relatively low engine coolant temperature and the high-temperature oil to cool the oil.

[0008]

【Example】

Next, a vehicle oil temperature control device according to the present invention will be described with reference to an embodiment shown in the drawings. Here, FIG.
FIG. 2 is a diagram showing an oil temperature control device for a vehicle. The vehicle oil temperature control device 1 is for maintaining the torque converter oil for operating the torque converter of the automatic transmission 2 at an appropriate oil temperature, and is provided with a water cooling system disposed in an engine room (not shown) of the vehicle. Engine 3, a radiator 4 arranged in front of the engine 3, an oil cooler 5 arranged beside the automatic transmission 2, a forced circulation cooling water circuit 6, and a thermo valve built in the oil cooler 5 7 etc.

The engine 3 has water jackets 10 and 11 provided inside a cylinder block 8 and a cylinder head 9, and an output shaft (not shown) is drivingly connected to a vehicle transmission via a torque converter. The water in the water jacket 10 of the cylinder block 8
While flowing from the front side to the rear side, it flows through the hole above the cylinder block 8 to the water jacket 11 of the cylinder head 9. Water in the water jacket 11 of the cylinder head 9 flows from the rear side of the engine 3 to the front side and flows out of the engine 3. Note that a gasket 12 is interposed between the cylinder block 8 and the cylinder head 9.

The radiator 4 absorbs waste heat while passing through the water jackets 10 and 11 of the engine 3 to exchange heat between cooling water whose water temperature has increased and air sent by a fan (not shown). This is a heat exchanger that cools the cooling water. The radiator 4 is installed at a place in the engine room of the automobile where the traveling wind can be effectively used.
The radiator 4 includes an upper tank 13, a lower tank 14, a core 15, and the like. A radiator cap 16 is attached to the upper tank 13.

The oil cooler 5 is a heat exchanger according to the present invention, which exchanges heat between torque converter oil and cooling water, and is attached to a housing of the torque converter using bolts 17.

As shown in FIG. 2, the oil cooler 5 (core 5a is not shown in detail) has an oil passage 18 through which torque converter oil flows and a cooling water passage 1 through which cooling water flows.
9 are provided close to each other so that heat can be exchanged. The cooling water passage 19 is provided with two cooling water inlets 20 and 21 and one cooling water outlet 22. Further, fins may be provided inside or outside the oil passage 18 and the cooling water passage 19.

The cooling water circuit 6 includes a first and a second water passage 2 for connecting the engine 3, the radiator 4, the oil cooler 5, the thermo valve 7, the thermostat 23, the water pump 24, the heater valve 25, and the heater core 26 in a ring shape.
7, 28, water passages 29 to 31, and a bypass water passage 32. The cooling water circuit 6 has five water passages according to the operation states of the thermo valve 7, the thermostat 23, and the heater valve 25.

The thermostat 23 is a valve of the present invention.
In addition, it is a thermo valve that automatically operates according to the engine cooling water temperature . The thermostat 23, a cooling water that has passed through the bypass passage 32 without passing through the La Jieta 4 closed when the water temperature of the cooling water is low, the water of the engine 3
Switching to circulate in the jacket 10, when the water temperature of the cooling water becomes high via the La Jieta 4 opening
The cooling water is switched so as to circulate through the water jacket 10 of the engine 3 . The water pump 24 applies pressure to the cooling water to forcibly circulate the cooling water in the cooling water circuit 6 .

The heater valve 25 is a valve for supplying and stopping the supply of the cooling water having absorbed the heat of the engine 3 to the heater core 26. The heater core 26 is a heat exchanger that is arranged in a duct of an air conditioner (not shown) and heats air passing through the duct.

The first water passage 27 is a cooling water passage that connects the outlet of the water jacket 11 of the cylinder head 9 and the cooling water inlet 20 of the oil cooler 5. 2nd waterway 28
Is a cooling water passage communicating between the outlet of the water pump 24 and the inlet of the water jacket 10 of the cylinder block 8 (hereinafter abbreviated as the inlet of the cylinder block 8) and the cooling water inlet 21 of the oil cooler 5.

The water passage 29 is a cooling water passage connecting the cooling water outlet 22 of the oil cooler 5 and the inlet of the water pump 24. The water passage 30 is provided between the outlet of the water jacket 11 of the cylinder head 9 and the upper tank 1 of the radiator 4.
3 is a cooling water passage communicating with the third inlet. The water channel 31
The cooling water passage connects the outlet of the lower tank 14 of the radiator 4 and the thermostat 23. Bypass waterway 32
Is a cooling water passage for bypassing the cooling water from the radiator 4 when the thermostat 23 is closed.

The thermo valve 7 is a temperature control valve of the present invention, and automatically operates according to the oil temperature of the torque converter oil.
As shown in FIG. 2, the thermo valve 7 includes a container 34 for sealing a thermo wax 33 for detecting the oil temperature of the torque converter oil in the oil passage 18, and the thermo valve 7 according to the oil temperature of the torque converter oil detected by the thermo wax 33. First water channel 27
As having a like valve 35, and this <br/> spring 36 for the return of the valve 35 for opening and closing the second water passage 28. A cooling water passage 39 through which cooling water flows is formed between the lands 37 and 38 of the valve 35.
The thermo wax 33 is the sensing part of the present invention, and is sealed in the container 34. This thermo wax 33
When heated by the torque converter oil, it expands and the valve 35
Is moved downward in FIG.

As shown in the graph of FIG. 3, the lands 37 and 38 of the valve 35 change the oil temperature of the torque converter oil to a first set oil temperature (for example, 80.degree.
° C) or lower, the thermo-wax 33 opens the cooling water inlet 20 of the cooling water passage 19 communicating with the first water passage 27, and opens the cooling water passage 19 communicating with the second water passage 28. Of the cooling water inlet 21 is closed. That is,
The cooling water circuit 6 is switched to the first water passage.

The lands 37 and 38 of the valve 35 are
As shown in the graph of FIG. 3, the engine load becomes low and medium load, the oil temperature of the torque converter oil rises from the first set oil temperature (for example, 80 ° C. to 90 ° C.), and the second set temperature (for example, 110 ° C.) When the thermo wax 33 detects that the temperature is lower than about 120 ° C., the cooling water inlet 20 and the second water passage 28 of the cooling water passage 19 communicating with the first water passage 27 are provided.
Both of the cooling water inlets 21 of the cooling water passage 19 communicating with the cooling water passage 19 are opened.

The lands 37, 38 of the valve 35
As shown in the graph of FIG. 3, when the thermo wax 33 detects that the engine load is high and the oil temperature of the torque converter oil has risen to a second set oil temperature (for example, 110 ° C. to 120 ° C.) or more, The cooling water inlet 20 of the cooling water passage 19 communicating with the first water passage 27 is closed, and the second water passage 28
The cooling water inlet 21 of the cooling water passage 19 communicating with the cooling water passage 19 is opened. That is, the cooling water circuit 6 is switched to the second water passage.

The first water passage is used to supply the cooling water flowing out of the water jacket 11 of the cylinder head 9 to the first water passage 2.
7 → cooling water passage 39 of thermo valve 7 → oil cooler 5
This is a path for returning to the water jacket 10 of the engine block 8 via the cooling water passage 19 → water passage 29 → water pump 24.

The second water passage is formed by a cooling water passage 30 out of the water jacket 11 of the cylinder head 9.
Radiator 4 → Thermostat 23 → Water pump 2
4 → Inlet of cylinder block 8 → Second water passage 28 → Cooling water passage 39 of thermo valve 7 → Cooling water passage 19 of oil cooler 5 → Water passage 29 → Water pump 24 → Return path to water jacket 10 of cylinder block 8 It is.

Next, the operation of the vehicle oil temperature control device 1 of this embodiment will be briefly described with reference to FIGS. (At the time of starting the engine) When starting the engine 3, since the oil temperature of the torque converter oil has dropped to about the outside temperature, the pump loss of the oil pump (not shown) is large, and the fuel consumed by the engine 3 driving the oil pump is increased. Increases consumption. Therefore, it is necessary to raise the oil temperature of the torque converter oil to an appropriate temperature as soon as possible after the engine is started.

For this reason, the thermo wax 33 of the thermo valve 7 built in the oil cooler 5 detects that the oil temperature of the torque converter oil has dropped below the first set oil temperature (for example, 80 ° C. to 90 ° C.). Sometimes thermo wax 3
3 is the most contracted state. Therefore, the first water passage 27 is opened by the land 37 of the valve 35, and the second water passage 28 is closed by the land 38.

As a result, the cooling water flowing out of the water jacket 11 of the cylinder head 9 is supplied to the first water passage 2
7 → cooling water passage 39 of thermo valve 7 → oil cooler 5
Cooling water passage 19 → water passage 29 → water pump 24 →
It flows through the water jacket 10 of the cylinder block 8 in order. Therefore, in the cooling water circuit 6 of the engine 3, the hottest cooling water from the water jacket 11 of the cylinder head 9 flows through the first water passage 27 to the oil cooler 5.

Accordingly, as shown in the graph of FIG. 4, in the oil cooler 5, heat exchange occurs between the cooling water (head water temperature) having a higher water temperature than the block water temperature and the torque converter oil having a lower oil temperature, so that the torque converter oil rapidly changes. Since it is heated, the torque converter oil quickly rises to an oil temperature of 80 ° C. or more, which is an appropriate temperature.

(During low and medium load operation of the engine 3) If the torque converter oil exceeds the first set oil temperature (for example, 80 ° C. to 90 ° C.) after, for example, 5 to 10 minutes have elapsed since the engine 3 was started. Then, the thermo wax 33 of the thermo valve 7 starts to expand, and the valve 35 is moved downward in FIG. Therefore, the first water passage 27 is opened by the land 37 of the valve 35, and the second water passage 28 is opened by the land 38. As a result, cooling water having a relatively high temperature flows from the water jacket 11 of the cylinder head 9 to the oil cooler 5 through the first water passage 27, and cooling water having a relatively low water temperature cooled by the radiator 4 is formed. Water flows through the oil cooler 5 through the second water passage 28 at the inlet of the cylinder block 8.

(During High Load Operation of Engine 3) Engine 3
When high-load operation is performed, especially when high-speed high-load continuous operation is performed, the oil temperature of the torque converter oil rises to an oil temperature approaching an allowable temperature (for example, 140 ° C.). In such a case, when the thermo wax 33 detects that the oil temperature of the torque converter oil has risen to the second set oil temperature (for example, 110 ° C. to 120 ° C.) or more, the expansion amount of the thermo wax 33 is increased. Will be the largest. Therefore, the first water passage 27 is closed by the land 37 of the valve 35, and the second water passage 28 is opened by the land 38.

As a result, the cooling water flowing out of the water jacket 11 of the cylinder head 9 is transferred to the water passage 30 →
Radiator 4 → Thermostat 23 → Water pump 2
4 → the inlet of the cylinder block 8 → the second water passage 28 → the cooling water passage 39 of the thermo valve 7 → the cooling water passage 19 of the oil cooler 5 → the water passage 29 → the water pump 24 → the water jacket 10 of the cylinder block 8 flows in this order. . Therefore, as shown in the graph of FIG. 4, the cooling water (block water temperature) having a relatively low water temperature cooled by the radiator 4 flows through the inlet of the cylinder block 8 and the second water passage 28 to the oil cooler 5. The cooling water (head water temperature) that has sufficiently absorbed the heat of the engine 3 is supplied to the oil cooler 5.
The oil-water temperature difference can be made larger as compared with the case where the water flows directly through the line (broken line A in FIG. 4).

Therefore, since the cooling water having a relatively low water temperature and the torque converter oil having a high oil temperature exchange heat in the oil cooler 5 to cool the torque converter oil, the cooling performance of the oil cooler 5 is improved. The amount of decrease in the oil temperature of the torque converter oil can be increased.

[Effects of Embodiment] As described above, the oil temperature control device 1 for an automobile does not require a water temperature sensor and an oil temperature sensor, and it is not necessary to externally control the thermo valve 7 by a control device or the like. The reduction in the number of parts can greatly reduce the manufacturing cost.

Further, when the engine 3 is operated under a high load and the oil temperature of the torque converter oil rises so as to approach the allowable temperature, cooling water flowing through the oil cooler 5 is supplied from the inlet of the cylinder block 8 of the engine 3. As a result, the oil-water temperature difference can be increased as in an oil cooler (conventional technology) built in the lower tank 14 of the radiator 4. For this reason, even if the oil temperature of the torque converter oil rises to approach the allowable temperature, the torque converter oil can be sufficiently cooled, and it is possible to avoid an increase in the size of the oil cooler 5.

Therefore, when the engine 3 is started, the highest temperature of the cooling water in the cooling water circuit 6 can accelerate the temperature rise of the torque converter oil, and when the oil temperature of the torque converter oil rises to a temperature approaching the allowable temperature, the radiator 4 turns on. Since the torque converter oil can be cooled by the cooled lowest temperature cooling water, it is possible to reduce the friction loss of the torque converter and increase the transmission force. Thus, the efficiency of the torque converter of the automatic transmission 2 can be improved, so that the fuel consumption can be reduced.

Since the opening of the thermo valve 7 is determined by the oil temperature of the torque converter oil, the radiator 4 is not used except when the engine is started or when the temperature of the torque converter oil is extremely high.
And water from the water jacket 11 of the cylinder head 9. In other words, since cooling water having a required water temperature can be supplied according to the oil temperature of the torque converter oil, appropriate temperature control of the torque converter oil can be performed with a relatively simple system.

[Modification] In this embodiment, the thermo-valve 7 is built in the oil cooler 5, but the temperature control valve is arranged outside the heat exchanger to switch the first and second water passages. May be. In this embodiment, the present invention is used for controlling the optimal temperature of torque converter oil. However, the present invention may be used for controlling the optimal temperature of lubricating oil such as engine oil and transmission oil and hydraulic oil.

The thermowax 3 of the thermo valve 7
By simply changing the number 3, it is possible to easily select a system according to the use environment such as a specification in a cold region. In this embodiment, the oil cooler 5 is arranged on the side of the automatic transmission 2, but the heat exchanger may be arranged at another place such as near the lower tank 14 of the radiator 4.

[0038]

According to the first aspect of the present invention, the temperature of the first water passage and the second water passage is controlled by using a temperature control valve that automatically detects the temperature of the oil flowing into the heat exchanger and automatically operates. Since the opening and closing are performed, electrical control by the control device is abolished, and the number of parts is reduced, so that manufacturing costs can be reduced. Further, at the time of starting the engine , the oil can be heated by the hottest engine cooling water in the cooling water circuit, so that the early temperature rise of the oil can be promoted. Then, when the oil temperature of the oil rises to a temperature approaching the allowable temperature, the oil can be cooled by the lowest temperature engine cooling water cooled by the radiator. Therefore, the oil-water temperature difference can be made large even when the oil temperature is extremely high, so that the oil can be sufficiently cooled without increasing the size of the heat exchanger.

[Brief description of the drawings]

FIG. 1 is a configuration diagram showing one embodiment of the present invention.

FIG. 2 is a diagram showing a thermo valve incorporated in an oil cooler.

FIG. 3 is a graph showing an open / close state of first and second water passages and a change in oil temperature.

FIG. 4 is a graph showing a change in water temperature and a change in oil temperature with respect to an operating state of the engine.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 Automotive oil temperature control apparatus 2 Automatic transmission 3 Engine 4 Radiator 5 Oil cooler 6 Cooling water circuit 7 Thermo valve (Temperature control valve) 8 Cylinder block 9 Cylinder head 10 Water jacket 11 Water jacket 20 Oil cooler (Heat exchanger) Cooling water inlet 21 of oil cooler (heat exchanger) Cooling water inlet 22 of oil cooler (heat exchanger) Cooling water outlet 23 Thermostat (valve) 27 First water passage 28 Second water passage 33 Thermo wax (sensing unit)

Continuation of the front page (56) References JP-A 60-75614 (JP, U) JP-A 63-92016 (JP, U) (58) Fields investigated (Int. Cl. ⁷ , DB name) F01P 7 / 16 504 F01M 5/00 F01P 11/08

Claims (1)

(57) [Claims] (A) a water-cooled engine cooled by engine cooling water; and (b) a radiator for cooling the engine cooling water by exchanging heat between the engine cooling water that has absorbed heat of the engine and air. (C) a bypass water passage for bypassing the radiator; and (d) a radiator passing through the radiator in accordance with an engine cooling water temperature.
The cooled engine cooling water into the engine,
Alternatively, the engine cooling water passing through the bypass
A valve for switching between whether to flow into the engine, oil and ene which generates heat by operating the (e) the vehicle
A heat exchanger and a gin cooling water to heat exchange, and the first water passage to water flow (f) provided in parallel with the radiator, the engine cooling water which has absorbed heat of the engine to the heat exchanger, ( g) a second water passage for passing the engine cooling water cooled by the radiator to the heat exchanger ; and (h) a sensing unit for sensing the oil temperature of the oil flowing into the heat exchanger. When the oil temperature of the oil sensed by the sensing unit is low, the first water passage is opened and the second water passage is closed, and when the oil temperature of the oil sensed by the sensing unit is high. the first copies to close the waterway example Bei a thermostatic valve which opens the second water passage, the cooling water outlet of the heat exchanger, downstream of position of said valve
Connected to a location between the
An oil temperature control device for a vehicle, comprising: