JPH11190213A - Engine cooling system for hybrid type vehicle - Google Patents

Abstract

PROBLEM TO BE SOLVED: To prevent the temperature in an engine room of a hybrid type vehicle from being excessively increased to suppress the temperature rise of apparatuses arranged in the engine room. SOLUTION: A cooling system for an engine 2 is composed of a heater cord cooling system consisting of pipelines p1, p2, p3, p4, and a heater core 42, and a radiator cooling system consisting of pipelines p1, p5, p6, p4, and a radiator 10. These cooling systems can be switched by directional changeover valves 24, 26 controlled by means of a cooling controller 18. When the temperature in an engine room is higher than a specified temperature, the cooling controller 18 controls the directional changeover valves 24, 26 to be switched to increase the flow rate of hot water sent out to the heat core 42 after cooling the engine 2. The temperature of the air heat-exchanged by a radiator 10 to be blown into the engine room is thus decreased. When the temperature of cooling water for the engine 2 is above a specified temperature, the cooling controller lowers output of the engine 2 to decrease the temperature of the cooling water.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an engine cooling system for a hybrid vehicle, and more particularly to switching control of an engine cooling system.

[0002]

2. Description of the Related Art In a cooling system for a water-cooled engine of a conventional hybrid vehicle, for example, a hybrid electric vehicle (hereinafter, referred to as HEV), a radiator is provided in front of the vehicle in the same manner as a conventional gasoline or diesel vehicle. Placed in the department. The radiator fan or the traveling wind dissipates the engine cooling water.

[0003]

However, the above-mentioned HE
When the engine is cooled by the V engine cooling system while the vehicle is stopped, there is a problem that the temperature in the engine room rises. That is, when the vehicle is stopped and the engine is operating for power generation, the hot air exchanged by the radiator flows into the engine room and raises the temperature in the engine room. As a result, there has been a problem that devices such as a motor, a generator, and a power generation controller disposed together with the engine in the engine room are excessively heated.

[0004] It is an object of the present invention to prevent an excessive rise in temperature in an engine room due to hot air after cooling of an engine, and to prevent overheating of equipment disposed in the engine room, particularly, an electrical unit.

[0005]

FIG. 1 shows an embodiment of the present invention.
The present invention will be described with reference to FIG. (1) The first aspect of the invention is a first heat radiating means 10 disposed at the front in an engine room to cool at least hot water after cooling the engine 2 used as a power source for power generation; Engine room temperature detecting means 21 for detecting the temperature in the room; when the temperature in the engine room detected by the engine room temperature detecting means 21 is equal to or higher than a predetermined temperature, the amount of heat radiated by the first heat radiating means 10 is reduced. The above-mentioned object is achieved by having the control means 18 for performing the control. (2) In the invention according to claim 2, the control means 18
Is to reduce the output of the engine 2 in order to reduce the amount of heat radiated by the first radiating means 10. (3) The invention according to claim 3 further includes cooling water temperature detecting means 22 for detecting the temperature of the hot water after cooling the engine 2; the control means 18 controls the engine when the cooling water temperature is higher than a predetermined water temperature. 2 lowers the output. (4) The invention according to claim 4 further includes a second heat radiating means 42 provided outside the engine room for cooling the hot water after cooling the engine 2;
When reducing the amount of heat dissipated by the heat dissipating means 10,
The amount of heat dissipated by the second heat dissipating means 42 is increased. (5) The second aspect of the present invention is the second heat radiation means.
Is a heater core for air conditioning. (6) The invention according to claim 6 further includes a cooling water temperature detecting means 22 for detecting a temperature of the hot water after cooling the engine 2, wherein the control means 18 controls the temperature in the engine room to be higher than a predetermined temperature, When the temperature of the hot water detected by the cooling water temperature detecting means 22 is higher than a predetermined water temperature, the second heat radiating means 4
2 increases the amount of heat dissipated. (7) The invention according to claim 7 further includes a cooling means 36 for performing cooling by a refrigeration cycle;
Is for cooling the air that is heat-exchanged by the second heat radiating means 42. (8) Explaining in connection with FIG. 6 showing an embodiment, the invention according to claim 8 is configured such that the air heat exchanged by the second heat radiating means 42 is supplied to either or both of the vehicle interior and exterior of the vehicle interior. It further has a switching guiding means 39 for switching to one side.

[0006] In the section of the means for solving the above-mentioned problems, which explains the configuration of the present invention, the drawings of the embodiments of the present invention are used to make the present invention easy to understand. However, the present invention is not limited to this.

[0007]

(1) According to the first aspect of the invention, when the temperature in the engine room is equal to or higher than the predetermined temperature, the amount of heat radiated by the first radiating means disposed in the front of the engine room. , Heat is exchanged and heated by the heat radiating means, and the temperature rise of the air flowing into the engine room can be suppressed. As a result, it is possible to suppress an excessive rise in temperature of the devices provided in the engine room. (2) According to the second aspect of the present invention, the amount of heat radiated by the first heat radiating means is reduced by lowering the output of the engine. A rise in temperature can be suppressed, and a rise in the temperature of engine cooling water can also be suppressed. (3) According to the third aspect of the invention, when the cooling water temperature is higher than the predetermined water temperature, an excessive increase in the temperature of the engine cooling water can be suppressed by reducing the output of the engine. (4) According to the invention described in claim 4, when the amount of heat radiated by the first radiator is reduced, the amount of heat radiated by the second radiator is increased, so that the engine cooling water is increased. Excessive temperature rise can be suppressed. (5) According to the invention as set forth in claim 5, the second heat radiating means can be used as a heating heat source of the air conditioner by using the second heat radiating means as a heater core. As a result, manufacturing costs can be reduced. (6) According to the invention described in claim 6, when the temperature in the engine room is higher than the predetermined temperature and the cooling water temperature is higher than the predetermined water temperature, the amount of heat radiated by the second radiating means is increased. If the temperature in the engine room is not high even when the cooling water temperature is high,
That is, it is possible not to increase the flow rate ratio of the hot water sent to the heater core. Thus, for example, when the air conditioner is operating in the cooling mode, the air blown into the passenger compartment is not heated. (7) According to the invention as set forth in claim 7, since the air to be heat-exchanged by the second heat radiating means is cooled by the cooling means, undesired warm air is not blown into the vehicle interior.
The comfort of the occupant can be maintained. (8) According to the invention as set forth in claim 8, the temperature of the air blown into the vehicle interior can be reduced by guiding the air heated and exchanged by the second heat radiating means into and out of the vehicle interior by the switching inducing means. It can be raised or suppressed. In particular, even when the air conditioner is performing the cooling operation, the heat radiation capacity of the heater core can be increased, so that the temperature rise in the engine room and the temperature of the engine coolant can be reduced without impairing the comfort of the occupants. It can be suppressed.

[0008]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS First Embodiment A first embodiment of the present invention will be described with reference to FIGS.

FIG. 1 is a block diagram showing a configuration of an HEV engine cooling system according to the present embodiment, and a charging system and an air conditioner mounted on the HEV together with the engine cooling system. Hereinafter, the engine cooling system, the charging system, and the air conditioner will be sequentially described.

The cooling system will be described. The engine 2 includes a water pump 12, a pipe p1, and a directional control valve 2.
6, pipeline p2, heater core 42, pipeline p3, directional control valve 24, pipeline p4, pipeline p5, radiator 10, pipeline p6
Is connected. These components form a circulation path for the cooling water of the engine 2. Directional valves 24 and 2
6 is connected to the cooling controller 18. By the cooling controller 18, the direction switching valve 24 is connected to the pipe p3 and the pipe p.
4 or the pipe p6 and the pipe p4. Similarly, the direction switching valve 26 is controlled so as to communicate between the pipeline p1 and the pipeline p2, or to communicate between the pipeline p1 and the pipeline p5.

The outputs of the cooling water temperature sensor 22 for detecting the temperature of the hot water after cooling the engine 2 and the temperature sensor 21 for detecting the temperature in the engine room are input to the cooling controller 18. The cooling controller 18 switches the direction switching valves 24 and 26 based on outputs from the cooling water temperature sensor 22 and the engine room temperature sensor 21 (switching control of the direction switching valves 24 and 26 will be described later). The cooling controller 18 also issues a control signal to the ECU 11 based on the output from the above-described sensor (the operation of the ECU 11 will be described later). The cooling system of the engine 2 is configured as described above.

The power generation system will be described. The output shaft of the engine 2 is connected to the generator 16 via the transmission 4. The electric power generated from the generator 16 with the rotation of the engine 2 is supplied to the battery 20 that can be charged and discharged repeatedly via the power controller 15 and the motor 1 that is the driving drive source of the HEV.
7 State of charge of battery 20 (State Of
Charge) is monitored by the SOC detector 19 connected to the battery 20.

The engine 2 is a gasoline engine or CNG
An internal combustion engine such as a (compressed natural gas) engine, a diesel engine, or a turbine engine can be used. In the following description, an example in which a gasoline engine is used as the engine 2 will be described. The ECU 11 is a controller for controlling the rotation of the engine 2 via an engine starter, fuel injector, throttle actuator, and the like (not shown). The power generation controller 14 connected to the generator 16 controls the power output of the generator 16. The ECU 11 and the power generation controller 14
Is connected to the SOC detector 19. SOC detector 19
Calculates the required power generation amount based on the state of charge of the battery 20,
A control signal is output to the ECU 11 and the power generation controller 14 based on the required power generation amount. Thus, the operating state of the engine 2 and the power output output from the generator 16 are controlled.

An air conditioning system will be described. Inside the air conditioning duct 30, a blower fan 32 driven by a fan motor 34, an evaporator 36, an air mix door 38, a sub-condenser 40, and a heater core 42 are provided. This air conditioning system is controlled by the control unit 58. The control unit 58 controls the rotation speed of the fan motor 34, thereby determining the amount of air sent into the air conditioning duct 30. The air sent into the air-conditioning duct 30 is dehumidified and cooled when passing through the evaporator 36, and the sub-condenser 40 and the heater core 4 are opened by the air mixing door 38 whose opening is controlled by the control unit 58.
2 that passes through the sub-condenser 40 and the heater core 42,
And shunted. The air F1, F air conditioned as described above
Reference numeral 2 blows out into the passenger compartment from an outlet (not shown) provided in an instrument panel or the like.

A description will be given of a refrigerant circulation path constituting the air conditioning system. The discharge port of the electric compressor 46 is connected to the pipe p.
11 is connected. Line p11 is connected to lines p12 and p1
3 and the on-off valve 52 is connected to the pipe p12,
Are connected to the on-off valves 50, respectively. The on-off valve 52 and the main condenser 56 are connected via a pipe p14,
The outlet side of the main condenser 56 and the inlet side of the check valve 54 are connected via a pipe p15. A pipe p16 is connected to the outlet side of the check valve 54, and the on-off valve 50 is connected to the pipe p16.
Is connected via a conduit p17. As described above, the other end of the pipe p16 connected to the pipe p17 and the check valve 54 is connected to the inflow side of the sub-condenser 40. Outflow side of sub-condenser 40 and expansion valve 4
8 is connected via a pipe p18, and the low pressure side of the expansion valve 48 and the inflow side of the evaporator 36 are connected via a pipe p19. A pipe p20, an accumulator 44, and a pipe p21 are provided between the outlet side of the evaporator 36 and the suction side of the electric compressor 46.
Is connected. As described above, the circulation path of the refrigerant is formed.

In the refrigerant circulation path formed as described above, the open state of the on-off valves 50 and 52 is determined by the control unit 5.
8. The high-temperature and high-pressure refrigerant discharged from the electric compressor 46 is supplied to the on-off valves 50 and 52 described above.
Is cooled and condensed when passing through the main condenser 56 in accordance with the open / close state of the pipe, and becomes a high-pressure and room-temperature liquid to form the pipe p16
(Cooling mode) and a case of bypassing the main condenser 56 and proceeding through the pipeline p16 with high-temperature and high-pressure gas (air conditioner heating mode).

In the air-conditioner heating mode, the high-temperature and high-pressure refrigerant exchanges heat with the sub-condenser 40, and at that time,
It is condensed and becomes a liquid at high pressure and normal temperature. As described above, in both the cooling mode and the air conditioner heating mode, the refrigerant flowing inside the pipe p18 becomes a high-pressure and normal-temperature liquid,
When the gas passes through the expansion valve 48, it expands rapidly, becomes a low-pressure low-temperature gas, and passes through the pipe p 19 and the evaporator 36.

The above-mentioned control unit 58 is a cooling controller 1
8 is connected via a signal line, and information on the amount of heat radiated from the heater core 42 is transmitted from the cooling controller 18 to the control unit 58. Based on this information, the control unit 58 controls the amount of air blown by the blower fan 32, the operating state of the electric compressor 46, the opening of the air mix door 38, and the like.

The switching control procedure of the engine cooling system executed by the cooling controller 18 in the engine cooling system shown in FIG. 1 will be described with reference to the flowchart of FIG. The cooling control procedure shown in FIG.
Is repeatedly executed by the cooling controller 18 when is in the operating state (the state in which the ignition switch is turned on). Therefore, depending on the state of the engine cooling system, for example, step S1 described below
When the control for switching the cooling water channel to the radiator 10 side is performed in 01, the cooling water channel may have already been switched to the radiator 10 side. In this case, the cooling water passage is maintained in a state of being switched to the radiator 10, but in the following description, it is simply expressed as "switching to radiator heat radiation".

In step S101, the cooling controller 18 controls the directional control valves 24 and 26 so that the pipes p1 and p5 and the pipes p4 and p6 are in communication with each other, that is, the cooling water channel is moved to the radiator 10 side. Then, the cooling water of the engine 2 is circulated between the engine 2 and the radiator 10. That is, switching to radiator heat radiation is performed. Thus, the hot water after cooling the engine 2 is cooled by the radiator 10 and returned to the engine 2. At this time, the air passing through the radiator 10 is heated to become hot air and blows into the engine room.

The cooling controller 18 determines in step S10
In step 2, information regarding the temperature in the engine room detected by the temperature sensor 21 in the engine room is input, and it is determined in step S103 whether the temperature in the engine room is equal to or higher than a predetermined temperature a ゜ C. If the determination is negative, that is, if it is determined that the temperature in the engine room is lower than a ゜ C, the process branches to step S101. On the other hand, step S
When the determination in step 103 is affirmative, that is, when it is determined that the temperature in the engine room is higher than a ゜ C, the process branches to step S104. In step S104, the cooling controller 18 controls the direction switching valves 24 and 26.
In a state where the pipes p1 and p2 and the pipes p4 and p3 are in communication with each other, that is, the cooling water path is connected to the heater core 42.
And the coolant of the engine 2 is circulated between the engine 2 and the heater core 42. That is, the mode is switched to the heat radiation of the heater core. Thereby, the hot water after cooling the engine 2 is cooled by the heater core 42 and returns to the engine 2.
At this time, the air passing through the heater core 42 is heated.

In step S105, the cooling controller 18 inputs information on the engine room temperature detected by the engine room temperature sensor 21. Then, in step S106, it is determined whether or not the temperature in the engine room is equal to or lower than a predetermined temperature b ゜ C which is set lower than a ゜ C. If the determination is negative, that is, if it is determined that the engine room temperature b ル ー ム C has been exceeded, step S
Branch to 104. On the other hand, if the determination in step S106 is affirmative, that is, if it is determined that the temperature in the engine room has dropped to b ゜ C or less, the flow branches to step S101.

With the above control, the cooling controller 18
When it is determined that the temperature in the engine room is equal to or higher than the predetermined temperature a ゜ C, the heat radiation from the radiator 10 is stopped and the heat radiation from the heater core 42 is switched. Then, when the temperature in the engine room falls to b 以下 C or lower, the mode is switched to the radiator heat radiation again. As a result, the electrical unit and the like disposed in the engine room do not overheat due to the rise in the temperature in the engine room.

FIG. 3 shows how the temperature in the engine room changes at this time. In the graph shown in FIG. 3, the horizontal axis indicates the passage of time, and the vertical axis indicates the temperature. The vertical axis of the graph shown in FIG. 3 also indicates a state of switching between the heat radiation of the heater core and the heat radiation of the radiator. With the start of the engine 2, the temperature of the engine cooling water starts to rise, and the radiator 10
The amount of heat dissipated from the air gradually increases. Accordingly, the temperature in the engine room also rises, and the temperature of the electrical unit disposed in the engine room also rises as the temperature in the engine room rises. Then, as shown by the circled numbers in the graph of FIG. 3, when the temperature in the engine room becomes more than a （C (), the heat radiation is switched from the radiator heat radiation to the heater core heat radiation, and when the temperature in the engine room becomes less than b ゜ C (). Switch from heater core heat radiation to radiator heat radiation. Thereafter, as the temperature in the engine room rises and falls, switching control is performed as follows.

In general, the reason why the temperature in the engine room tends to rise is that the engine 2 operates for power generation,
And when the vehicle is stopped. This is a situation that can occur when traveling on a congested road or when waiting for a traffic light. When the vehicle starts running, the hot air trapped in the engine room is guided to the outside of the engine room by the running wind, and the temperature in the engine room eventually decreases. In such a case, the engine cooling system according to the present embodiment promptly switches to heat radiation from radiator 10, so that undesired hot air does not continue to blow out into the vehicle interior.

-Second Embodiment- A second embodiment of the present invention will be described with reference to FIGS. FIG. 4 shows a HE HEW similar to that shown in FIG.
This is a switching control procedure of the engine cooling system repeatedly executed by the cooling controller 18 when V is in the operating state. In the description of the second embodiment,
As in the description of the first embodiment, for example, the control operation for switching from the heat radiation from the heater core to the radiator heat radiation and the control operation for maintaining the radiator heat radiation state are collectively expressed as “switch to the radiator heat radiation”.

In step S201, the cooling controller 18 switches to radiator heat radiation. The cooling controller 18 inputs information on the temperature in the engine room detected by the temperature sensor 21 in the engine room in step S202, and determines whether the temperature in the engine room is equal to or higher than a predetermined temperature a 温度 C in step S203. If the determination is negative, that is, if it is determined that the temperature in the engine room is lower than a ゜ C, step S201 is performed.
Branch to On the other hand, when the determination in step S203 is affirmative, that is, when it is determined that the temperature in the engine room is higher than a ゜ C, the process branches to step S204.

In step S204, the cooling controller 18 controls the engine 2 detected by the cooling water temperature sensor 22.
Enter information about the temperature of the hot water after cooling. In step S205, the cooling controller 18 determines whether or not the cooling water temperature is equal to or lower than a predetermined water temperature c ゜ C. When the determination is affirmative, that is, when it is determined that the cooling water temperature is equal to or lower than c ゜ C, the process branches to step S201. On the other hand, if the determination in step S205 is negative, that is, if it is determined that the cooling water temperature exceeds the predetermined temperature c ゜ C, the cooling controller 18 proceeds to step S206.
To switch to heater core heat radiation. Cooling controller 18
Inputs information about the temperature of the hot water after cooling of the engine 2 detected by the cooling water temperature sensor 22 in step S207, and determines in step S208 whether or not this cooling water temperature is c ゜ C or lower. Affirmation of the determination in step S208,
That is, when it is determined that the cooling water temperature is equal to or lower than c ゜ C, the cooling controller 18 branches to step S201 and switches to radiator heat radiation. On the other hand, if the determination in step S208 is negative, that is, if it is determined that the cooling water temperature exceeds c ゜ C, the cooling controller 18 proceeds to step S209.
Branch to In step S209, the cooling controller 18 inputs information on the temperature in the engine room detected by the temperature sensor 21 in the engine room, and determines in step S210 whether the temperature in the engine room is equal to or lower than a predetermined temperature b ゜ C. If the determination in step S210 is negative, that is, if it is determined that the temperature in the engine room exceeds b は C, the cooling controller 18 branches to step S206. On the other hand, the determination in step S210 is affirmative, that is, the engine room temperature is b
If it is determined that it is not more than ゜ C, the cooling controller 18 branches to step S201.

The above steps S201 to S21
According to the control of 0, even if the temperature in the engine room is high, for example, in the case of a vehicle left under the hot summer sun,
If the engine cooling water temperature is not high, radiator heat radiation can be performed. Therefore, the temperature of the air flowing in the air conditioning duct does not rise due to the heat radiation of the heater core. For this reason, the air conditioner can quickly reduce the temperature of the vehicle compartment, which has become hot.

On the other hand, if the engine 2 is operating while the vehicle is stopped and the vehicle starts running after a while and the cooling water temperature has risen, the running wind is guided into the engine room, At the same time, the hot air in the engine room is discharged outside, so that the temperature in the engine room rapidly decreases. In such a case, according to the engine cooling system according to the present embodiment, it is possible to switch from the heat radiation from the heater core to the heat radiation to the radiator even when the cooling water temperature is high, so that the heat radiation from the heater core is performed when the heating operation is unnecessary. Can be avoided as much as possible.

As described above, according to the engine cooling system according to the present embodiment, by switching between the heater core cooling and the radiator cooling based on the temperature in the engine room and the cooling water temperature, the overheating of the electrical unit in the engine room is achieved. Can be prevented. At this time, when the heating operation of the air conditioner is unnecessary, the heat radiation from the heater core can be avoided as much as possible, so that the comfort of the occupant is not impaired. Conversely, when a heating operation is required, the heating capacity may be increased by switching from radiator heat radiation to heater core heat radiation regardless of the temperature in the engine room or the temperature of the cooling water. By doing so, the heating capacity can be increased.

Third Embodiment A third embodiment of the present invention will be described with reference to FIGS. FIG. 5A shows a switching control procedure of the engine cooling system repeatedly executed by the cooling controller 18 when the HEV is in the operating state, as in the case shown in FIG. 2 or FIG. FIG. 5B shows the cooling controller 1 in step S323 described later.
8 is a diagram illustrating the determination operation of FIG. In the description of the third embodiment, as in the description of the first or second embodiment, for example, the control operation of switching from the heat radiation from the heater core to the heat radiation of the radiator and the control operation of maintaining the heat radiation state of the radiator are collectively performed. And "switch to radiator heat dissipation".

In step S301, the cooling controller 18 switches the cooling system of the engine 2 to radiator heat radiation. The cooling controller 18 determines in step S302
In step S303, information relating to the temperature in the engine room detected by the temperature sensor 21 in the engine room is input.
It is determined whether or not this is the case. If the determination is negative, that is, if it is determined that the temperature in the engine room is lower than a ゜ C, the process branches to step S301. On the other hand, step S3
If the determination in step 03 is affirmative, that is, if it is determined that the temperature in the engine room is higher than a ゜ C, the process branches to step S304.

In step S304, the cooling controller 18 controls the engine 2 detected by the cooling water temperature sensor 22.
Enter information about the temperature of the hot water after cooling. In step S305, the cooling controller 18 determines whether the cooling water temperature is equal to or lower than a predetermined water temperature c ゜ C. If the determination is affirmative, that is, if the cooling water temperature is equal to or lower than c ゜ C, the process branches to step S301. On the other hand, if the determination in step S305 is negative, that is, if it is determined that the cooling water temperature exceeds the predetermined temperature c ゜ C, the cooling controller 18 proceeds to step S3.
At 06, the mode is switched to heater core heat radiation. The cooling controller 18 inputs information on the temperature of the hot water after cooling the engine 2 detected by the cooling water temperature sensor 22 in step S307, and determines in step S308 whether the cooling water temperature is equal to or lower than a predetermined water temperature c ゜ C. Cooling controller 18
When the determination in step S308 is affirmative, that is, when it is determined that the cooling water temperature is equal to or lower than c ゜, step S30
The process branches to 9 and inputs information on the temperature in the engine room detected by the temperature sensor 21 in the engine room. The cooling controller 18 determines whether or not the temperature in the engine room is equal to or lower than the predetermined temperature b ゜ C in step S310 and makes an affirmative judgment, that is, branches to step S301 if it determines that the temperature in the engine room is equal to or lower than b ゜ C. I do. On the other hand, the cooling controller 18 determines in step S
If the determination in 310 is negative, that is, if it is determined that the engine room temperature exceeds b ゜ C, the process branches to step S306.

The cooling controller 18 determines in step S308
Are denied, that is, the processing of steps S321 to S328, which is the processing when it is determined that the cooling water temperature exceeds c ゜ C, will be described.

In step S321, the cooling controller 18 outputs a control signal to the power generation controller 14,
Reduce the power output. Along with this, the output of the engine 2 decreases, and the calorific value of the engine 2 also decreases. In step S322, the cooling controller 18 inputs information Te regarding the temperature of the hot water after the cooling of the engine 2 detected by the cooling water temperature sensor 22. The cooling controller 18
In step S323, the above-described water temperature information Te is determined for three cases described below. If it is determined that the water temperature information Te is in the zone of FIG. 5B, that is, c ゜ C <Te ≦ d ゜ C, the process proceeds to step S.
The process branches to step S321 if it is determined in the zone, that is, if Te ≦ c ゜ C, and to step S324 if it is determined that it is in the zone, that is, Te> d ＞ C. Branch.

In step S324, the cooling controller 18 issues a control signal to the ECU 11 to stop the operation of the engine 2. The cooling controller 18 inputs information on the cooling water temperature of the hot water after cooling the engine 2 detected by the cooling water temperature sensor 22 in step S325. If the cooling controller 18 denies the determination in step S326, that is, determines that the cooling water temperature exceeds c ゜ C, the process branches to step S325.
If affirmative, that is, if it is determined that the cooling water temperature is equal to or lower than c ゜ C, the flow branches to step S327. The cooling controller 18 sends a control signal to the ECU 11 in step S327 to start the engine 2 and jumps to step S328.

In step S328, the cooling controller 18 issues a control signal to the power generation controller 14 regarding the power generation output return. In response to this, the power generation controller 14 controls the power generation output of the generator 16 so as to generate power using the power based on the power generation request amount output from the SOC detector 19. The cooling controller 18 determines in step S
Upon completion of the process at 328, the process jumps to step S309.

When the determination result of the water temperature Te in step S323 described above is in a zone, a zone or a zone, a specific situation will be described with reference to FIG. 5B. Zone This corresponds to a situation where the temperature of the hot water after cooling the engine 2 is equal to or lower than the predetermined temperature c ゜ C and the engine 2 can be operated at a normal output. In this case, the cooling controller 18 branches to step S328 to return the output of the generator 16 to the state before the power generation output was reduced in step S321.
At this time, if the required power output from the SOC detector 19 has changed at the time of branching to step S328, the power generation controller 18 controls the power output of the generator 16 according to the required power output. Zone This corresponds to a situation where the temperature of the hot water after cooling the engine 2 is slightly high, and it is desirable to lower the power generation output to make the temperature of the cooling water. In this case, the cooling controller 18 branches to step S321 to lower the power generation output of the generator 16, and expects the cooling water temperature to decrease. Zone This corresponds to a situation in which the temperature of the hot water after cooling the engine 2 is high, and it is desirable to stop the operation of the engine 2 and immediately stop the cooling water temperature. In this case, the cooling controller 18 branches to step S324 to stop the operation of the engine 2, and expects to immediately stop the cooling water temperature.

As described above, according to the engine cooling system for a hybrid vehicle according to the third embodiment, 1) switching from radiator cooling to heater core cooling when the temperature in the engine room exceeds a predetermined temperature; In accordance with the temperature of the engine cooling water, the power output of the generator is reduced (the output of the engine is lowered) or the operation of the engine is stopped to reduce the temperature of the engine cooling water. 3) In response to the decrease in the temperature of the engine cooling water 4) It is possible to switch from the heater core cooling to the radiator cooling as the engine cooling water temperature and the temperature in the engine room decrease. As a result, even if the heat dissipation capacity of the heater core is small, or the operation mode of the air conditioner is in the cooling mode, even if the cooling water temperature of the engine coolant rises due to insufficient heat dissipation by the heater core, the output of the engine can be reduced. , Or by stopping the operation of the engine, it is possible to suppress an increase in the cooling water temperature of the engine. Therefore, it is possible to prevent overheating of the electrical unit and the like disposed in the engine room, and at the same time, maintain the comfort of the occupant.

In the above description of the embodiment, the cooling controller 18 switches from radiator heat radiation to heater core heat radiation when the temperature in the engine room reaches a predetermined temperature or higher. In this case, the temperature of the air blown into the passenger compartment may increase, and the comfort of the occupant may decrease. In such a case, a control signal is transmitted from the cooling controller 18 to the control unit 58 of the air conditioner, and the electric compressor 46 is activated to perform the cooling operation, thereby preventing the temperature of the air blown into the vehicle compartment from rising. Can be.
At this time, the control unit 58 controls the amount of heat absorbed by the evaporator 36, the amount of air blown by the blower fan 32, the opening of the air mix door 38, and the like based on the control signal received from the cooling controller 18. Prevent temperature rise.

When the air conditioner does not need to perform the heating operation when radiating the heater core, the heater core 42
It is also possible to prevent the undesired warm air from being blown into the vehicle interior by guiding the air heated in the above to the outside of the vehicle interior. This will be described with reference to FIG. In the block diagram showing the configuration of the engine cooling system, the charging system, and the air conditioner of the HEV shown in FIG. 6, the same components as those shown in FIG.

In FIG. 6, the exhaust duct 31 is provided behind the heater core 42. An air distribution control door 39 is provided at a communication portion between the air conditioning duct 30 and the exhaust duct 31. The opening of the air distribution adjusting door 39 is determined by the cooling controller 1.
8 is controlled. Then, when the radiator heat radiation is switched to the heater core heat radiation, and when the heating operation of the air conditioner is unnecessary, the cooling controller 18 opens the air distribution control door 39 in the + direction in the drawing, and removes the air heated by the heater core 42. It is led out of the passenger compartment through the exhaust duct 31. In this way, when the warm air heated by the heater core 42 is unnecessary, it is led out of the passenger compartment through the exhaust duct 31 so that the temperature of the air blown into the passenger compartment does not undesirably increase, and the comfort of the occupant does not increase. Does not impair. Further, by adjusting the amount of air blown by the blower fan 32, the opening of the air mix door 38, and the opening of the air distribution control door 39, the amount of air blown into the vehicle interior and the heater core 42 are cooled and then led out of the vehicle interior. It is possible to independently control the amount of air to be blown. Therefore, the cooling performance of the engine cooling water by the heater core 42 can be enhanced while maintaining the comfort of the occupant.

In the above description of the embodiment, an example in which the cooling water passage of the engine 2 is switched according to the engine room temperature detected by the engine room temperature sensor 21 has been described.
Instead of 1, the temperature of the electrical component unit or the like may be detected by another sensor, and the radiator heat radiation and the heater core heat radiation may be switched according to the temperature of the electrical component unit. Similarly, as the cooling water temperature sensor 22, a temperature sensor mounted on a cylinder block or the like of the engine 2 may be used, or an oil temperature sensor for detecting the temperature of engine oil may be used.

Further, in the description of the first to third embodiments, an example will be described in which, when the engine cooling system is switched from the radiator heat radiation to the heater core heat radiation or the heater core heat radiation to the radiator heat radiation, either one of the heat radiation is switched. However, the radiation of the radiator and the radiation of the heater core may be used together at an appropriate radiation ratio. In this case, the direction switching valves 24 and 26 may be constituted by a proportional solenoid valve or the like.

In the above description of the embodiment, an example of switching between radiator heat radiation and heater core heat radiation has been described. For example, instead of heater core heat radiation, another heat radiation unit is provided at the rear of the vehicle or the like to reduce the temperature in the engine room. When the temperature exceeds a predetermined temperature or when the temperature of the engine cooling water exceeds the predetermined water temperature, the heat radiation unit may be switched to heat radiation.

In the hybrid vehicle, since the vehicle can be driven by a motor, it is not always necessary to make the required horsepower and the engine output coincide with each other when the vehicle is running. Further, it is not necessary to operate the engine in an idling state in preparation for the start of the vehicle in a situation such as when waiting for a traffic light. Therefore,
Increase in the temperature in the engine room due to radiator radiation,
In order to suppress an increase in the temperature of the engine cooling water, the output of the engine may be temporarily reduced, or the operation of the engine may be temporarily stopped. At this time, if the power of the water pump 12 in FIG. 1 or FIG. 6 is made electric, the cooling speed of the engine cooling water can be increased even when the operation of the engine is stopped. In addition, by controlling the discharge amount of the water pump 12 at this time, it is possible to control the heat radiation amount in any of the radiator heat radiation and the heater core heat radiation.

In the correspondence between the above-described embodiment and the claims, the radiator 10 functions as the first heat radiation means, the engine room temperature sensor 21 functions as the engine room temperature detecting means, the cooling controller 18 controls the control means, and the like. The cooling water temperature sensor 22 serves as a cooling water temperature detecting means, and the heater core 42 serves as a second
, The evaporator 36 constitutes cooling means, and the air distribution adjusting door 39 constitutes switching guidance means.

[Brief description of the drawings]

FIG. 1 is a diagram showing an engine cooling system for a hybrid vehicle according to first to third embodiments, and a configuration of a charging system and an air conditioner installed together with the engine cooling system.

FIG. 2 is a flowchart illustrating an engine cooling system switching program executed by a control unit of the engine cooling system according to the first embodiment.

FIG. 3 is a diagram showing a state in which the temperature of an engine cooling water, the temperature in an engine room, and the temperature of an electrical unit in the engine room change over time with the operation of the engine cooling system according to the first embodiment.

FIG. 4 is a flowchart illustrating an engine cooling system switching program executed by a control unit of the engine cooling system according to the second embodiment.

FIGS. 5A and 5B are diagrams illustrating a control procedure executed by a control unit of the engine cooling system according to the third embodiment, where FIG. 5A is a flowchart thereof, and FIG. 5B is a flowchart of the flowchart shown in FIG. It is a figure explaining the judgment procedure performed in Step S323.

FIG. 6 is a diagram showing another example of the engine cooling system according to the embodiment of the present invention.

[Explanation of symbols]

 2 Engine 10 Radiator 11 ECU 14 Power Generation Controller 15 Power Controller 16 Generator 18 Cooling Controller 19 SOC Detector 20 Battery 21 Engine Room Temperature Sensor 22 Cooling Water Temperature Sensor 24, 26 Direction Switching Valve 30 Air Conditioning Duct 36 Evaporator 38 Air Mix Door 39 Air distribution control door 42 Heater core 46 Electric compressor 58 Control unit (for air conditioner)

──────────────────────────────────────────────────の Continued on the front page (51) Int.Cl. ⁶ Identification code FI F02D 29/02 F02D 29/02 D (72) Inventor Hiroyuki Hirano 2 Takaracho, Kanagawa-ku, Yokohama-shi, Kanagawa Nissan Motor Co., Ltd. (72 Inventor Eiji Inada 2 Takara-cho, Kanagawa-ku, Yokohama-shi, Kanagawa Prefecture Inside Nissan Motor Co., Ltd. Nissan Motor Co., Ltd., 2 Takaracho, Kanagawa-ku, Yokohama-shi

Claims (8)

[Claims] An engine for detecting a temperature in the engine room, wherein the first heat radiating means is disposed at a front side in an engine room to cool at least hot water after cooling the engine, which is used as a power source for power generation. Room temperature detecting means, and control means for reducing the amount of heat radiated by the first heat radiating means when the temperature in the engine room detected by the engine room temperature detecting means is equal to or higher than a predetermined temperature. An engine cooling system for hybrid vehicles. 2. The engine cooling system for a hybrid vehicle according to claim 1, wherein the control unit reduces the output of the engine to reduce the amount of heat radiated by the first radiating unit. An engine cooling system for a hybrid vehicle. 3. The engine cooling system for a hybrid vehicle according to claim 2, further comprising: a cooling water temperature detecting unit configured to detect a temperature of the hot water after cooling the engine, wherein the control unit determines that the cooling water temperature is a predetermined value. If it is higher than the water temperature,
An engine cooling system for a hybrid vehicle, wherein the output of the engine is reduced. 4. The engine cooling system for a hybrid vehicle according to claim 1, wherein a second heat radiating means disposed outside the engine room for cooling the hot water after the engine cooling is provided. The hybrid vehicle according to claim 1, wherein the controller increases the amount of heat radiated by the second radiator when reducing the amount of heat radiated by the first radiator. Engine cooling system. 5. The engine cooling system for a hybrid vehicle according to claim 4, wherein said second heat radiating means is a heater core for air conditioning. 6. The engine cooling system for a hybrid vehicle according to claim 5, further comprising: a cooling water temperature detecting unit configured to detect a temperature of the hot water after cooling the engine, wherein the control unit is configured to control a temperature of the engine room. When the temperature is higher than a predetermined temperature and the temperature of the hot water detected by the cooling water temperature detecting means is higher than the predetermined water temperature, the amount of heat radiated by the second heat radiating means is increased. Vehicle engine cooling system. 7. The engine cooling system for a hybrid vehicle according to claim 6, further comprising cooling means for performing cooling by a refrigeration cycle, wherein said cooling means is air exchanged by said second heat radiating means. An engine cooling system for a hybrid vehicle, comprising: 8. The engine cooling system for a hybrid vehicle according to claim 6, wherein the air that has been heat-exchanged by the second heat radiating means is switched and guided to inside and / or outside the vehicle compartment. An engine cooling system for a hybrid vehicle, further comprising a switching guide unit.