JPH11132040A - Cooling device for hybrid vehicle - Google Patents

Abstract

PROBLEM TO BE SOLVED: To reduce the size of a radiator or the like in a cooling device for hybrid vehicle. SOLUTION: This radiator is provided with valves 41, 42, 43, 51, 52, 53 which can change the volume ratio of a radiating area cooling water passes through between an in-engine water jacket 21 and an in-traveling motor water jacket 27, and is formed so as to control the volume ratio of the radiating area according to the loads of an engine and a traveling motor.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a device for cooling both an engine and a traveling motor in a hybrid vehicle.

[0002]

2. Description of the Related Art Conventionally, as a cooling device for a hybrid vehicle, there is a cooling device in which cooling water is circulated to both an engine and a traveling motor, and a radiator for promoting heat radiation from the cooling water to the outside air is used to forcibly cool them. (For example, see Japanese Utility Model Laid-Open No. 5-69328).

[0003]

However, when the cooling water path circulating through the engine and the cooling water path circulating through the traveling motor are provided independently, the radiators constituting each cooling water path are independently provided. Therefore, there is a problem that the radiator becomes large.

[0004] It is an object of the present invention to reduce the size of a radiator or the like in a cooling device for a hybrid vehicle.

[0005]

[Means for Solving the Problems]

(1) The invention of claim 1 is applied to a cooling device including a heat exchanger that circulates a cooling medium between an engine and a traveling motor.

The heat exchanger has a heat radiation area common to the engine and the traveling motor, and has a heat radiation area where the cooling medium on the engine side circulates and a heat radiation area where the cooling medium on the traveling motor side circulates. The above object is achieved by providing a capacity changing means for changing a capacity ratio, a load detecting means for detecting a load of an engine and a motor for traveling, and a capacity control means for controlling a capacity ratio of a heat radiation area according to the load. Achieved.

(2) A cooling device for a hybrid vehicle according to a second aspect of the present invention is a cooling pipe for promoting heat radiation of a cooling medium to a heat exchanger;
It has an upper tank that guides the cooling medium to the cooling pipe, and a lower tank that guides the cooling medium flowing out of the cooling pipe.Circulation paths that circulate the cooling medium between the engine and the motor for traveling are connected in parallel to the upper tank and the lower tank. And
A plurality of valves for distributing the cooling medium to each cooling pipe are interposed in the upper tank and the lower tank as capacity changing means, and the capacity control means opens and closes each valve according to the load to cool between the engine and the running motor The above object is achieved by controlling the capacity ratio of the heat radiation area in which the medium is circulated.

(3) In the cooling device for a hybrid vehicle according to claim 3, the capacity control means opens and closes the valve of the lower tank with respect to the opening and closing timing of the valve of the upper tank when increasing the capacity of the heat radiation area occupied by the traveling motor. The above object is achieved by delaying the timing.

[0009]

【The invention's effect】

(1) According to the first aspect of the invention, a common heat radiation area between the engine and the traveling motor is set in the heat exchanger,
Since the capacity ratio of the heat radiating region is switched according to the load of the engine and the traveling motor, the cooling performance of the engine and the traveling motor can be enhanced without increasing the capacity of the heat exchanger.

(2) According to the second aspect of the present invention, by switching the open / close position of each valve interposed in the upper tank and the lower tank according to the load of the engine and the traveling motor, the engine and the heat exchanger of the heat exchanger are switched. The capacity ratio of the heat dissipation area for circulating the cooling medium between the motor and the running motor is switched, so the design of the heat exchanger can be reduced with a small design change and the radiator capacity can be increased without increasing the capacity of the radiator. Motor cooling can be improved.

(3) According to the third aspect of the invention, when increasing the capacity of the heat radiation area occupied by the traveling motor, the opening and closing timing of the valve of the lower tank is delayed with respect to the opening and closing timing of the valve of the upper tank. The high-temperature cooling medium in the engine-side circulation passage is prevented from flowing into the motor-side circulation passage, and the temperature of the cooling medium in the motor-side circulation passage is prevented from rising, so that the cooling performance of the traveling motor is maintained.

[0012]

DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment in which the present invention is applied to a series hybrid vehicle (SHEV) will be described.

FIG. 1 is a diagram showing the configuration of the first embodiment.

The engine 1 is a prime mover for driving the generator 2, and an internal combustion engine such as a gasoline engine or a diesel engine is used.

The engine controller 3 includes the engine 1
Control of the intake air amount, fuel injection amount, ignition timing, and the like. The fuel injection amount is controlled by calculating a basic injection amount Tp based on the intake air amount Qa detected by the air flow meter 13 and the rotation speed N of the engine 1 detected by the rotation sensor 12, and supplying the basic injection amount Tp to the engine 1. The fuel injection amount of the fuel injection valve 16 provided for each cylinder is feedback-controlled via the drive circuit 15 so that the air-fuel ratio of the air-fuel mixture becomes the target value.

The generator 2 is a rotating machine that generates electric power used for running the vehicle and charging the battery 4, and a three-phase AC generator or the like is used. The generator controller 5 is the generator 2
And converts the generated three-phase AC power into DC power and supplies the DC power to the motor controller 6 and the battery 4.

The motor controller 6 includes an inverter and a control device, converts DC power into AC power, and supplies the AC power to the traveling motor 7. The traveling motor 7 is a rotating machine serving as a traveling drive source of the vehicle, and a three-phase synchronous motor, a three-phase induction motor, or the like is used.

The battery 4 is a battery for supplying electric power to the traveling motor 7, and is charged by electric power generated from the generator 2 and regenerative electric power from the motor 7. Note that an electric double layer power capacitor can be used for the battery 4. The driving force of the traveling motor 7 is
Is transmitted to the drive wheels 9 via the.

The vehicle controller 10 is connected to a vehicle speed sensor 11 for detecting a traveling speed V of the vehicle, a current sensor 14 for detecting a current A supplied to the traveling motor 7, and the like. The vehicle controller 10 includes peripheral components such as a microcomputer and a memory 10a, and controls on-vehicle devices such as the engine controller 3, the generator controller 5, and the motor controller 6. Further, a valve drive circuit 17 is connected to the vehicle controller 10, and butterfly valves 41, 42, 43, 5 to be described later.
The operation of the cooling device is controlled by controlling the drive actuator groups 18 of 1, 52, and 53. As will be described later, the variable capacity control of the cooling device is performed according to the load of the traveling motor 7 estimated based on the current A and the load of the engine 1 estimated based on the fuel injection amount. Therefore, the drive current A of the traveling motor 7 and the basic fuel injection amount Tp of the engine 1 are stored in the memory 10a of the vehicle controller 10.
Is set in advance and data in which the heat radiation area of the radiator 20 is set.

The cooling device will be described. As shown in FIG. 2, a cooling water circulation passage 22 for circulating cooling water between a water jacket 21 in the engine and a radiator (heat exchanger) 20 via a water pump (not shown), a water jacket 27 in the motor and a radiator 20 Cooling water circulation passages 28 for circulating cooling water via a water pump (not shown) are provided between the cooling water circulation passages 28 and 28. The water jacket 21 in the engine circulates cooling water (cooling medium) around the combustion chamber of the engine 1 and absorbs heat generated in the engine 1. The water jacket 27 in the motor also circulates cooling water in the housing of the motor 7 for traveling, and absorbs heat generated in the motor 7 for traveling.

As shown in FIG. 3, a radiator 20 common to each of the water jackets 21 and 27 has an upper tank 40 and a lower tank 50 extending in the horizontal direction, and a number of radiators extending in the vertical direction connecting the upper tank 40 and the lower tank 50. And a cooling pipe 31.

The upper tank 40 is provided with inlets 35 and 36 through which cooling water flows from the respective water jackets 21 and 27. The lower tank 50 is provided with outlets 37 and 38 for guiding the cooling water to the respective water jackets 21 and 27.

A number of radiating fins 34 are provided around the cooling pipe 31. The cooling pipe 31 and the radiating fins 34 are installed so that the traveling wind hits the front part of the vehicle, and a fan for blowing the cooling pipe 31 and the radiating fins 34 is provided. The heat radiation is promoted.

The upper tank 40 is provided with three valves 41, 42 and 43 as capacity changing means for changing the capacity of cooling water circulating in the radiator 20.
Three valves 51, 52, 53 are interposed in the lower tank 50. Butterfly type valves 41, 42, 43, 5
Each of 1, 52, and 53 includes an oblong plate-shaped valve element 61 and a valve shaft 62 that rotatably supports the valve element 61.

As shown in FIG. 4, a plate 63 for accommodating each valve element 61 is interposed in the lower tank 50. FIG.
As shown in FIG. 7, a sheet portion 64 to which the outer peripheral portion of the valve element 61 is in close contact is formed on the plate 63 as an inclined surface. Valve 6
As shown by the solid line in FIG. 1, the lower tank 50 is partitioned by the valve body 61 and the plate 63 when the closed position is in close contact with the seat portion 64. When the valve element 61 is in the open position as shown by a two-dot chain line in the figure, the inside of the lower tank 50 is not partitioned off by the valve element 61. The valves 51, 52, 53 having the same valve structure are also provided in the upper tank 40.
Are provided at corresponding positions.

The valve 41 and the valve 51, the valve 42 and the valve 52, and the valve 43 and the valve 53 are arranged side by side in the vertical direction so as to be sandwiched by two common cooling pipes 31, and they are both closed. Radiator 2
The heat radiation area of 0 is divided into the engine side and the motor side. Here, the radiation area of the radiator 20 in FIG. 2 will be described by dividing it into four areas A, B, C, and D by a valve 41 and a valve 51, a valve 42 and a valve 52, and a valve 43 and a valve 53.

The vehicle controller 10 executes a control program shown in FIG. 9 to perform control for switching the heat radiation area of the radiator 20 in accordance with the driving current A of the traveling motor 7 and the basic fuel injection amount Tp of the engine 1. The flowchart of FIG. 9 shows a routine for controlling the opening and closing of each of the valves 41, 42, 43, 51, 52, 53, and is executed by the vehicle controller 10 at regular intervals.

First, in step S1, the current sensor 1
The driving current A of the traveling motor 7 detected by the controller 4 is read, and the process proceeds to step S2 to read the basic fuel injection amount Tp. Subsequently, the process proceeds to step S3, where the heat radiation area of the radiator 20 is determined according to the driving current A of the traveling motor 7 and the basic fuel injection amount Tp.

If it is determined that the basic fuel injection amount Tp is larger than the predetermined value and the drive current A of the traveling motor 7 is smaller than the predetermined value, the process proceeds to step S4, where the valve 43
And the valve 53 are both closed, and the other valves 41, 42,
Valves 51 and 52 are opened. Thereby, the radiator 20
The areas A, B and C are the water jackets 21 in the engine.
6, the cooling water is circulated as indicated by the arrow in FIG. 6, and the cooling performance of the engine 1 is improved.
The cooling water is circulated as indicated by the arrow in FIG. 6 to form a motor-side heat radiation area, and the traveling motor 7 is cooled.

If it is determined that the basic fuel injection amount Tp and the driving current A of the traveling motor 7 are both medium, the process proceeds to step S5, where both the valves 42 and 52 are closed, and the other valves are closed. 41, 43, 51 and 53 are opened. As a result, the radiator 20 cools the engine 1 while the areas A and B serve as an engine-side heat radiation area for circulating cooling water between the water jacket 21 and the engine as shown by the arrow in FIG. C and D serve as a motor-side heat radiation area for circulating cooling water between the water jacket 27 in the motor as shown by an arrow in FIG. 7, and the traveling motor 7 is cooled.

When it is determined that the basic fuel injection amount Tp is smaller than the predetermined value and the driving current A of the traveling motor 7 is larger than the predetermined value, the process proceeds to step S6, where both the valve 41 and the valve 51 are closed. Other valves 42, 43, 5
2, 53 are opened. As a result, the radiator 20 cools the engine 1 while the area A serves as an engine-side heat radiating area for circulating the cooling water between the water jacket 21 in the engine as shown by an arrow in FIG. C and D serve as a motor-side heat dissipation area for circulating cooling water between the water jacket 27 in the motor as shown by the arrow in FIG. 8, and the cooling performance of the traveling motor 7 is enhanced.

As described above, the heat radiation area of the radiator 20 is switched according to the load of the engine 1 and the traveling motor 7, thereby cooling the engine 1 and the traveling motor 7 without increasing the capacity of the radiator 20. You can enhance the nature.

-Modification of Embodiment of the Invention- As another embodiment, when the heat radiation area of the radiator 20 is switched between the engine 1 and the traveling motor 7, the valves 41, 42, 43 of the upper tank 40 are switched. Each valve 51, 52, 5 of the lower tank 50 with respect to the opening / closing timing
The opening / closing timing of the cooling water circulation passage 3 may be delayed so that the high-temperature cooling water circulating in the engine-side cooling water circulation passage 22 does not flow into the motor-side cooling water circulation passage 28.

The flowchart of FIG.
4 shows a routine for controlling opening / closing of 42, 43, 51, 52, 53, and is executed by the vehicle controller 10 at regular intervals.

To explain this, first, in step S
At 11, the driving current A of the traveling motor 7 detected by the current sensor 14 is read, and the routine proceeds to step S12, where the basic fuel injection amount Tp is read. Subsequently, the process proceeds to step S13, in which the heat radiation area of the radiator 20 is determined according to the drive current A of the traveling motor 7 and the basic fuel injection amount Tp.

Here, if it is determined that the basic fuel injection amount Tp is larger than the predetermined value and the drive current A of the traveling motor 7 is smaller than the predetermined value, the routine proceeds to step S4, where the valve 43
And the valve 53 are both closed, and the other valves 41, 42,
Valves 51 and 52 are opened. Thereby, the radiator 20
The areas A, B and C are the water jackets 21 in the engine.
6, the cooling water is circulated as indicated by the arrow in FIG. 6, and the cooling performance of the engine 1 is improved.
The cooling water is circulated as indicated by the arrow in FIG. 6 to form a motor-side heat radiation area, and the traveling motor 7 is cooled.

If it is determined that the basic fuel injection amount Tp and the drive current A of the traveling motor 7 are both medium, the process proceeds to step S15, where the basic fuel injection amount T
It is determined whether p is greater than a predetermined value. Here, when it is determined that the basic fuel injection amount Tp is larger than the predetermined value, and the motor-side heat radiation region is expanded from the region D to the regions C and D, the process proceeds to steps S16 and S17, and the valves 42 and 53 are first closed. , Other valves 41, 43, 51,
The valve 52 is opened for a predetermined time (several seconds).

As a result, a part of the cooling water circulating in the motor-side cooling water passage 28 flows into each cooling pipe 31 in the area C as shown by an arrow in FIG. The high-temperature cooling water interposed in each cooling pipe 31 in the region C flows out to the engine-side cooling water circulation passage 22, and the water temperature in the region C decreases. As a result, the high-temperature cooling water circulating in the engine-side cooling water circulation passage 22 flows into the motor-side cooling water passage 28 and
Excessive rise in the temperature of the cooling water 8 is suppressed, and the cooling property of the traveling motor 7 is maintained.

If it is determined in step S17 that the predetermined time has elapsed, or if it is determined in step S15 that the basic fuel injection amount Tp is medium even in the previous flow, the process proceeds to step S18, and the valve proceeds to step S18. 42 and valve 5
2 are both closed and the other valves 41, 43, 51, 53
Is opened. As a result, the radiator 20 has the area A
B serves as an engine-side heat radiating area for circulating cooling water with the water jacket 21 in the engine as shown by an arrow in FIG.
D is a motor-side heat radiation area for circulating cooling water between the motor water jacket 27 and the motor as shown by the arrow in FIG.

On the other hand, at step S13, the basic fuel injection amount Tp is smaller than the predetermined value and the driving current A
If it is determined that is larger than the predetermined value, step S1
Proceeding to 9, it is determined whether or not the basic fuel injection amount Tp was medium in the previous flow. Here, the basic fuel injection amount T
If it is determined that p is moderate and the motor-side heat dissipation area is expanded from the areas C and D to the areas B, C and D, the process proceeds to steps S20 and S21, where the valves 41 and 52 are closed and the other valves are closed. The valves 41, 43, 51, 52 are opened for a predetermined time (several seconds).

As a result, a part of the cooling water circulating through the motor-side cooling water passage 28 flows into each cooling pipe 31 in the area B, as indicated by an arrow in FIG. The high-temperature cooling water interposed in each cooling pipe 31 in the region B flows out to the engine-side cooling water circulation passage 22, and the water temperature in the region B decreases. As a result, the high-temperature cooling water circulating in the engine-side cooling water circulation passage 22 flows into the motor-side cooling water passage 28 and
Excessive rise in the temperature of the cooling water 8 is suppressed, and the cooling property of the traveling motor 7 is maintained.

If it is determined in step S21 that the predetermined time has elapsed, or if it is determined in step S19 that the basic fuel injection amount Tp is medium even in the previous flow, the process proceeds to step S22, and the valve proceeds to step S22. 41 and valve 5
1 are closed together and the other valves 42, 43, 52, 53
Is opened. As a result, the radiator 20 cools the engine 1 while the area A serves as an engine-side heat radiating area for circulating the cooling water between the water jacket 21 in the engine as shown by an arrow in FIG. C,
D serves as a motor-side heat radiating area for circulating cooling water with the water jacket 27 in the motor as shown by the arrow in FIG. 8, thereby improving the cooling performance of the traveling motor 7.

In this way, when increasing the capacity of the motor side heat radiation area, each valve 41,
By delaying the opening / closing timing of each valve 52, 53 of the lower tank 50 with respect to the opening / closing timing of 42,
The high-temperature cooling water in the engine-side circulation passage 22 flows into the motor-side circulation passage 28 and the temperature of the cooling water in the motor-side circulation passage 28 is prevented from rising, so that the cooling performance of the traveling motor 7 is maintained.

Note that the determination in step S19 is made in step S19.
15, the valve 41 and the valve 53 are both closed, and the other valves 42, 43, 51, 5
2 keeps the valve open state for a predetermined time, and proceeds to step 22 after the predetermined time has elapsed.

In the above embodiment, in relation to the first aspect, the capacity changing means of the heat exchanger includes the valves 41, 42,
43, 51, 52 and 53, the engine load detecting means corresponds to the engine controller 3, the running motor 7 load detecting means corresponds to the current sensor 14, and the heat exchanger capacity controlling means corresponds to the vehicle controller 10. .

As another embodiment, as shown in FIG. 13, four radiators 71, 7 are provided at the front of a vehicle 70.
The configuration may be such that the engine cooling water circulation passage and the motor cooling water circulation passage are selectively connected to the radiators 71, 72, 73, 74 by arranging the cooling water circulation passages 2, 73, 74 in the front-rear direction.

In this case, when the motor load is small and the engine load is large, the motor-side cooling water circulation passage is connected to the radiator 71 in the front row, and each radiator 7 behind it is connected.
The engine-side cooling water circulation passage is connected to 2, 73, 74.

When the motor load and the engine load are both medium, the motor-side cooling water circulation passage is connected to the radiator 71 in the front row and the radiator 72 in the second row, and the radiators 73 and 74 in the third and fourth rows are connected. To the engine-side cooling water circulation passage.

When the motor load is large and the engine load is small, the radiators 7 in the front row, the second row and the third row
Connect the motor side cooling water circulation passage to 1, 72, 73,
An engine-side cooling water circulation passage is connected to each radiator 74 behind the radiator 74.

In this manner, the radiators 71, 72, 73, 7 are set in accordance with the loads of the engine and the traveling motor.
By switching the cooling water circulation passage connected to 4, the cooling performance of the engine and the traveling motor can be enhanced without increasing the capacity of the radiators 71, 72, 73, 74.

The cooling air such as running air is supplied to each radiator 7.
1, 72, 73, and 74, the temperature gradually increases in the process of passing through the radiator. The radiator of the motor-side cooling water circulation passage through which relatively low-temperature cooling water flows flows through the engine-side cooling water circulation passage through which relatively high-temperature cooling water flows. By arranging the radiators in front of the vehicle with respect to the radiators 71, 72, 7
At 3,74, heat radiation from the cooling water to the cooling air is promoted,
A sufficient heat exchange rate is ensured.

In each of the above embodiments, an example in which the present invention is applied to a series hybrid vehicle has been described. However, the present invention is not limited to a series hybrid vehicle, and may be, for example, a series-parallel hybrid vehicle (SPHV). It can also be applied to cooling equipment.

[Brief description of the drawings]

FIG. 1 is a diagram showing a configuration of an embodiment.

FIG. 2 is a diagram showing a configuration of a cooling device.

FIG. 3 is a front view of the radiator.

FIG. 4 is a partial cross-sectional view of the radiator.

FIG. 5 is a partial sectional view of the radiator.

FIG. 6 is an explanatory diagram showing a flow of cooling water in the radiator.

FIG. 7 is an explanatory diagram showing a flow of cooling water in the radiator.

FIG. 8 is an explanatory diagram showing a flow of cooling water in the radiator.

FIG. 9 is a flowchart showing control contents of the cooling device.

FIG. 10 is a flowchart showing control contents of a cooling device according to a modification of the embodiment.

FIG. 11 is an explanatory diagram showing a flow of cooling water in the radiator.

FIG. 12 is an explanatory diagram showing a flow of cooling water in the radiator.

FIG. 13 is a diagram showing a configuration of another embodiment.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Generator driving engine 2 Generator 3 Engine controller 4 Battery 5 Generator controller 6 Motor controller 7 Driving motor 10 Vehicle controller 10a Memory 11 Vehicle speed sensor 12 Rotation sensor 14 Current sensor 17 Valve drive circuit 18 Valve actuator 21 Engine water Jacket 22 Engine-side cooling water circulation passage 27 Water jacket in motor 28 Motor-side cooling water circulation passage 40 Upper tank 41-43 valve 50 Lower tank 51-53 valve

Claims (3)

[Claims] 1. A cooling device for a hybrid vehicle including a heat exchanger that circulates a cooling medium between an engine and a traveling motor, wherein the heat exchanger has a common heat radiation between the engine and the traveling motor. A capacity varying means for varying a capacity ratio between a heat dissipation area in which the cooling medium on the engine side circulates and a heat dissipation area in which the cooling medium on the traveling motor side circulates; and A cooling device for a hybrid vehicle, comprising: load detection means for detecting a load; and capacity control means for controlling a capacity ratio of the heat radiation area according to a load. 2. The cooling device for a hybrid vehicle according to claim 1, wherein the heat exchanger includes a cooling pipe for promoting heat radiation of the cooling medium, an upper tank for guiding the cooling medium to the cooling pipe, and exiting from the cooling pipe. A lower tank through which a cooling medium is guided, wherein the upper tank and the lower tank are connected in parallel with respective circulation paths for circulating a cooling medium between the engine and the traveling motor, and the upper tank as the capacity variable means And a plurality of valves for distributing a cooling medium to each of the cooling pipes in the lower tank, and the capacity control unit opens and closes each of the valves according to a load to cool the engine and the traveling motor. A cooling device for a hybrid vehicle, wherein a capacity ratio of the heat radiation area for circulating a medium is controlled. 3. The cooling device for a hybrid vehicle according to claim 2, wherein the capacity control unit opens and closes a valve of the upper tank when increasing a capacity of a heat radiation area in which the cooling medium circulates on the traveling motor side. Wherein the opening / closing timing of the valve of the lower tank is delayed.