JP7182657B2 - vehicle - Google Patents

Description

The present invention relates to a vehicle having an internal combustion engine and an electric motor as drive sources.

2. Description of the Related Art As a technique for cooling equipment in an engine room of a vehicle, there is known a technique that opens and closes a vent in the front part of the vehicle according to the heat generation state of the equipment in the engine room (see, for example, Patent Document 1).

The vehicle disclosed in Patent Document 1 is provided with an upper vent and a lower vent in the front part of the vehicle, and each of the vents is provided with an upper shutter mechanism and a lower shutter mechanism. The upper shutter mechanism and the lower shutter mechanism open and close the upper and lower vents according to the heat generation (operational status) of devices such as an internal combustion engine, an electric motor, and an air conditioner (condenser) in the engine room.
Specifically, when the amount of heat generated by the equipment in the engine room is the highest, the upper and lower shutters are controlled so that both the upper and lower vents are opened, and the amount of heat generated by the equipment in the engine room is reduced. In the least circumstance, the upper and lower shutters are controlled to close both the upper and lower vents. When the amount of heat generated by equipment in the engine room is moderate, the upper and lower shutters are controlled so that the upper ventilation port is closed and the lower passage port is opened.

Japanese Patent No. 4887914

By the way, in a vehicle having an internal combustion engine and an electric motor as drive sources, running by the internal combustion engine, which generates a large amount of heat, and running by the electric motor, which generates less heat than the internal combustion engine, are switched according to the driving conditions of the vehicle. For this reason, in this type of vehicle, if an appropriate flow rate of outside air can be taken into the cooling part of each drive source when running with the internal combustion engine and running with the electric motor, the cooling performance of the equipment and the reduction of running resistance can be improved. It can be made compatible at a high level. However, in the vehicle described in Patent Document 1, the shutter mechanism is not controlled from such a viewpoint.

SUMMARY OF THE INVENTION Accordingly, it is an object of the present invention to provide a vehicle capable of taking in an appropriate flow rate of outside air into a cooling portion of a drive source according to the operating conditions of the drive source.

A vehicle according to the present invention employs the following configuration in order to solve the above problems.
That is, the vehicle according to the present invention includes an internal combustion engine (for example, the engine 10 of the embodiment) as a drive source of the vehicle, an electric motor (for example, the electric motor 11 of the embodiment), and a An upper shutter mechanism (for example, the upper shutter mechanism 23 of the embodiment) for opening and closing an upper vent (for example, the upper vent 21 of the embodiment), and a lower vent arranged below the upper vent in the front part of the vehicle. A lower shutter mechanism (for example, the lower shutter mechanism 24 in the embodiment) for opening and closing a port (for example, the lower ventilation port 22 in the embodiment) is arranged to face at least the upper ventilation port, and cools the internal combustion engine. A first radiator (for example, the first radiator 14 in the embodiment) that dissipates the heat of the coolant to the outside air, and a drive unit for the electric motor (for example, the drive unit in the embodiment) that are arranged to face the lower vent. 15) to the outside air (for example, the second radiator 16 in the embodiment), and a shutter control device (for example, in the embodiment) that controls the upper shutter mechanism and the lower shutter mechanism. and a control device 25), wherein the shutter control device controls the lower shutter mechanism to open the lower vent when there is a request to cool the drive unit.

With the above configuration, when there is a request to cool the drive unit of the electric motor when the electric motor is driven, the shutter mechanism controls the lower shutter mechanism so as to open the lower vent. As a result, the lower vent facing the second radiator is opened, and outside air flows into the second radiator through the lower vent. As a result, even when the internal combustion engine is not driven, the second radiator, which is a cooling portion for the electric motor, is efficiently cooled by an appropriate amount of outside air.

When the liquid temperature inside the second cooling circuit that flows the cooling liquid to the second radiator is equal to or higher than a predetermined liquid temperature threshold value (for example, the liquid temperature threshold value Tm1 in the embodiment), the shutter control device opens the lower vent. The lower shutter mechanism may be controlled to open.

In this case, when the liquid temperature inside the second cooling circuit reaches or exceeds a predetermined liquid temperature threshold as the electric motor is driven, the lower shutter mechanism opens the lower vent, and outside air flows into the second radiator through the lower vent. become. Therefore, even when the internal combustion engine is not driven, the second radiator, which is a cooling portion for the electric motor, is efficiently cooled by the appropriate flow rate of outside air.

At a position facing the lower vent, the peripheral parts (for example, the mounting part 5, the steering part 6, and the transmission 20 of the embodiment) located behind the first radiator and the second radiator are provided with the second radiator. A cooling duct (for example, the cooling duct 28 of the embodiment) may be arranged to bypass the first radiator and the second radiator and flow outside air.

In this case, when the lower vent is opened by the lower shutter mechanism, outside air flows into the second radiator through the lower vent and also efficiently flows around the rear peripheral parts through the cooling duct. As a result, the peripheral parts can be efficiently cooled by the outside air that is not heated by the first radiator and the second radiator.

A vehicle includes a transmission (e.g., the transmission 20 of the embodiment) that shifts the power of at least one of the internal combustion engine and the electric motor, and a lubrication cooling circuit (e.g., the lubrication cooling circuit 30 of the embodiment) that lubricates and cools the transmission. ), a circuit heat exchange unit (for example, the circuit heat exchange unit 33 of the embodiment) that exchanges heat between the second cooling circuit and the lubricating cooling circuit, and the cooling liquid of the second cooling circuit to the circuit heat An on-off valve (e.g., the on-off valve 32 of the embodiment) interposed in a bypass passage (e.g., the bypass passage 31 of the embodiment) that flows to the replacement part; and a valve control device 25A), wherein the valve control device detects when the oil temperature of the lubricating oil inside the lubricating cooling circuit is equal to or higher than a predetermined oil temperature threshold (for example, the oil temperature threshold Tk1 in the embodiment) , the opening/closing valve may be controlled to open.

In this case, when the oil temperature of the lubricating oil in the lubricating cooling circuit for the transmission reaches or exceeds a predetermined oil temperature threshold, the valve control device opens the opening/closing valve of the second cooling circuit for cooling the drive unit, and the second radiator cools the second radiator. The coolant in the second cooling circuit flows into the circuit heat exchanging portion. As a result, the coolant in the second cooling circuit and the lubricating oil in the lubricating cooling circuit are heat-exchanged in the circuit heat exchanging portion, and the lubricating oil in the lubricating cooling circuit is cooled. Therefore, when this configuration is adopted, the temperature of the lubricating fluid in the lubricating cooling circuit is suppressed from rising above the predetermined oil temperature threshold by the outside air that cools the second radiator through the lower vent.

The shutter control device closes the lower vent port regardless of the oil temperature inside the lubricating cooling circuit when the liquid temperature of the second cooling circuit is less than the predetermined liquid temperature threshold. may be controlled.

In this case, when the liquid temperature of the second cooling circuit is less than the predetermined liquid temperature threshold, the lower vent is closed by the lower shutter mechanism, thereby quickly raising the temperature of the cooling liquid in the second cooling circuit to an appropriate temperature. It becomes possible to let At this time, since the lower vent is closed by the lower shutter mechanism, running resistance of the vehicle is suppressed.
Further, at this time, since the temperature of the coolant in the second cooling circuit is low (temperature below the predetermined liquid temperature threshold), the oil temperature of the lubricating oil in the lubricating cooling circuit for the transmission reaches the predetermined oil temperature threshold. When heat exchange is performed by the circuit heat exchanging portion as described above, the lubricating oil in the lubricating cooling circuit is cooled through the circuit heat exchanging portion.

The liquid temperature inside the first cooling circuit that flows the cooling liquid to the first radiator is equal to or higher than a first threshold (for example, the first threshold Tn1 in the embodiment) and a second threshold (for example, the second threshold Tn2 in the embodiment) the shutter control device controls the upper shutter mechanism and the lower shutter mechanism so as to open the upper vent and close the lower vent when the liquid inside the first cooling circuit is When the temperature is equal to or higher than the second threshold, the shutter control device may control the upper shutter mechanism and the lower shutter mechanism so as to open the upper vent and the lower vent.

In this case, only the upper vent is opened by the upper shutter mechanism when the liquid temperature inside the first cooling circuit for cooling the internal combustion engine is equal to or higher than the first threshold and lower than the second threshold. As a result, the first radiator is cooled to an appropriate temperature by outside air passing through the upper vent, and an increase in running resistance of the vehicle due to the opening of the lower vent is suppressed.
Further, when the liquid temperature inside the first cooling circuit for cooling the internal combustion engine is equal to or higher than the second threshold value, the upper stage vent and the lower stage vent are opened by the upper stage shutter mechanism and the lower stage shutter mechanism. As a result, the cooling liquid in the first radiator is quickly cooled by a large amount of outside air passing through the upper and lower vents, and peripheral parts are efficiently cooled.

Preferably, the first radiator faces the upper vent and the lower vent.

In this case, when the upper and lower vents are opened by the upper shutter mechanism and the lower shutter mechanism, the outside air passing through the upper and lower vents efficiently hits a wide range of the first radiator, and the first radiator is closed. The coolant flowing inside will be cooled quickly. Therefore, when this configuration is employed, the cooling performance of the first radiator for cooling the internal combustion engine can be effectively switched by controlling the upper shutter mechanism and the lower shutter mechanism.

The vehicle is arranged to face the upper vent, and is a condenser (for example, the condenser 17 of the embodiment) that radiates condensation heat of the refrigerant flowing through the refrigerant circuit of the air conditioner (for example, the air conditioner 12 of the embodiment) to the outside air. and wherein the shutter control device controls the upper shutter mechanism to open the upper vent when the air conditioner is in operation.

In this case, when the air conditioner is in operation, the upper vent is opened by the upper shutter mechanism, and the condenser of the air conditioner is cooled by outside air. Therefore, when this configuration is adopted, regardless of the temperature of the coolant flowing through the first radiator for cooling the internal combustion engine, the heat dissipation function of the condenser of the air conditioner can be ensured.

In the vehicle according to the present invention, when there is a request to cool the drive unit of the electric motor, the shutter control device controls the lower shutter mechanism so as to open the lower vent facing the second radiator for the electric motor. . Therefore, in the vehicle according to the present invention, an appropriate flow rate of outside air can be taken into the cooling portion of the drive source according to the operating conditions of the drive source.

FIG. 2 is a schematic configuration diagram of a main part of the vehicle of the embodiment, which is a vertical cross section along the vehicle front-rear direction; FIG. 2 is a plan view of a lower component member in the engine room of the vehicle according to the embodiment; 1 is a circuit diagram showing part of a cooling circuit of a vehicle according to an embodiment; FIG. 4 is a flowchart showing the control flow of the vehicle according to the embodiment; 4 is a flowchart showing the control flow of the vehicle according to the embodiment; 4 is a flowchart showing the control flow of the vehicle according to the embodiment;

BEST MODE FOR CARRYING OUT THE INVENTION An embodiment of the present invention will be described below with reference to the drawings. Note that directions such as front, rear, left, and right in the following description are the same as those of a vehicle traveling forward. In addition, an arrow FR pointing to the front of the vehicle, an arrow LH pointing to the left side of the vehicle, and an arrow UP pointing to the upper side of the vehicle are shown at appropriate locations in the drawing.

FIG. 1 is a schematic configuration diagram of a main portion of a front portion of a vehicle 1 according to the present embodiment, which is a vertical cross section along the vehicle front-rear direction.
In FIG. 1, reference numeral 2 denotes an engine room provided in front of the driver's seat. A pair of front side frames (not shown) are arranged in the engine room 2 so as to extend substantially along the longitudinal direction of the vehicle. An internal combustion engine 10 (hereinafter referred to as "engine 10") and an electric motor 11, which are driving sources, are supported by the pair of front side frames via subframes 3. As shown in FIG. The engine 10 and the electric motor 11 are arranged as an integrated block together with the transmission 20 (see FIG. 3) in a substantially central portion within the engine room 2 .
The driving of the engine 10 and the electric motor 11 is appropriately controlled by the control device 25 according to the driving conditions of the vehicle. Further, the electric motor 11 performs regenerative power generation under the control of the control device 25 during braking of the vehicle.

A cooling block 13 is arranged in front of the engine 10 and the electric motor 11 to cool the respective cooling portions of the engine 10, the electric motor 11, and the air conditioner 12 with outside air.
The cooling block 13 includes a first radiator 14 for radiating the heat of the coolant of the engine 10 to the outside air, and a second radiator 14 for radiating the heat of the coolant for cooling the drive unit 15 (PDU) of the electric motor 11 to the outside air. 2 radiator 16 , a condenser 17 for radiating condensation heat of the refrigerant circuit (refrigerating cycle) of the air conditioner 12 to the outside air, and a cooling fan 18 arranged behind the first radiator 14 . The second radiator 16 is arranged in a lower area on the front side of the first radiator 14 , and the capacitor 17 is arranged in an upper area on the front side of the first radiator 14 . The first radiator 14 is formed to be larger than the second radiator 16 and the condenser 17 on the front side in order to radiate the heat of the coolant of the engine 10 which generates a large amount of heat.

An upper ventilation port 21 and a lower ventilation port 22 are arranged in the central region of the vehicle front in the vehicle width direction to allow communication between the vehicle front side and the inside of the engine room 2 . The upper vent 21 is arranged at a position facing the front surface of the condenser 17 of the cooling block 13 , and the lower vent 22 is arranged at a position facing the front surface of the second radiator 16 of the cooling block 13 . The first radiator 14 positioned behind the condenser 17 and the second radiator 16 has an upper region facing the upper vent 21 with the condenser 17 interposed therebetween, and a lower region facing the lower vent with the second radiator 16 interposed therebetween. We are facing 22.

The upper vent 21 is provided with an upper shutter mechanism 23 for opening and closing the upper vent 21 . The upper shutter mechanism 23 is provided with an actuator 23a for operating an opening/closing portion such as a louver. Similarly, the lower vent 22 is provided with a lower shutter mechanism 24 for opening and closing the lower vent 22 . The lower shutter mechanism 24 is also provided with an actuator 24a for operating an opening/closing portion such as a louver. Each actuator 23a, 24a of the upper shutter mechanism 23 and the lower shutter mechanism 24 is controlled by a control device 25 (shutter control device). The control of the upper shutter mechanism 23 and the lower shutter mechanism 24 by the controller 25 will be detailed later.

FIG. 2 is a plan view of the lower component members in the engine room 2. FIG. 2 denotes a front wheel driven by a power source (engine 10, electric motor 11) via a transmission 20. As shown in FIG.
As shown in FIGS. 1 and 2, an undercover 26 is arranged at the bottom of the engine room 2 . The undercover 26 extends from the lower side of the front bumper face 27 at the front of the vehicle along the lower surface of the subframe 3 to a floor panel (not shown) of the passenger compartment. That is, the undercover 26 is formed to cover the lower portions of the cooling block 13, the engine 10, the electric motor 11, the transmission 20, the drive source mount component 5, the steering component 6, and the like.

On the upper surface of the front side of the undercover 26, the outside air that has passed through the lower area of the lower vent 22 bypasses the second radiator 16 and the first radiator 14, and flows behind the first radiator 14 in the engine room 2. Cooling ducts 28 are arranged for flowing into the area. The cooling duct 28 includes a wide base duct portion 28A facing the lower region of the lower vent 22 from the rear side, and a branch duct portion 28B disposed facing the rear portion of the base duct portion 28A. An intake port 28a facing the rear surface of the lower vent 22 is formed in the front end portion of the base duct portion 28A. The branch duct portion 28B includes a central exhaust port 28b that opens toward the front side of the engine 10 and the electric motor 11, and a central exhaust port 28b that opens toward the rear side of the vehicle at a position that bypasses the engine 10 and the electric motor 11 outward in the vehicle width direction. A pair of open side outlets 28c are formed. Outside air that has passed through the lower region of the lower vent 22 flows into the engine 10 and the electric motor 11 through the central outlet 28b as cooling air, and passes through the side outlet 28c to other peripheral parts (for example, the mount part 5, the steering part, etc.). 6. It flows into the transmission 20) as cooling air.

The first radiator 14 of the cooling block 13 is arranged in a first cooling circuit (not shown) that flows coolant in a water jacket (not shown) of the engine 10 . The first radiator 14 radiates the heat of the coolant that has cooled the engine 10 in the first circuit to the outside air. The first cooling circuit is provided with a first temperature sensor S1 (see FIG. 1) that detects the temperature of the coolant flowing through the circuit. A detection signal from the first temperature sensor S1 is input to the control device 25 . The control device 25 receives a detection signal from the first temperature sensor S1 and controls the upper shutter mechanism 23 and the lower shutter mechanism 24 according to the detection signal.

Specifically, in the controller 25, a first threshold value Tn1 and a second threshold value Tn2 (Tn1<Tn2) are determined for the liquid temperature in the first cooling circuit. The control device 25 opens the upper vent 21 and closes the lower vent 22 when the liquid temperature of the cooling liquid inside the first cooling circuit is equal to or higher than the first threshold Tn1 and lower than the second threshold Tn2. Also, the actuators 23a and 24a of the upper shutter mechanism 23 and the lower shutter mechanism 24 are controlled. Further, when the liquid temperature of the cooling liquid inside the first cooling circuit is equal to or higher than the second threshold value Tn2, the control device 25 controls the upper shutter mechanism 23 and the lower shutter mechanism to open the upper vent 21 and the lower vent 22 . 24 actuators 23a and 24a.
When the liquid temperature of the cooling liquid inside the first cooling circuit is less than the first threshold value Tn1, the liquid temperature of the cooling liquid inside the second cooling circuit 29 described later and the operation status of the air conditioner 12 may change to the upper vent 21. is not satisfied, the control device 25 controls the upper shutter mechanism 23 so as to close the upper vent 21 .

FIG. 3 shows a circuit showing a second cooling circuit 29 for cooling the drive unit 15 (PDU) of the electric motor 11 and a lubricating cooling circuit 30 for circulating and supplying lubricating oil to the transmission 20 and mechanical moving parts of the electric motor 11. It is a diagram.
As shown in FIG. 3, the second cooling circuit 29 includes an electric feed pump P1, a drive unit 15 (PDU), and a second radiator 16 arranged in a main circuit 29m. The coolant supplied from the feed pump P1 cools the drive unit 15, and the heat absorbed by the drive unit 15 is radiated to the outside air in the second radiator 16. FIG. The drive unit 15 includes an inverter that converts a DC current from a high-voltage battery (not shown) into a three-phase AC, a DC-DC converter that converts the voltage of the DC current, and the like, and generates high heat during operation.
Further, the second cooling circuit 29 includes a bypass passage 31 that bypasses the upstream side and the downstream side of the drive unit 15 and communicates with each other. is interposed.

The main circuit 29m of the second cooling circuit 29 is provided with a second temperature sensor S2 that detects the temperature of the coolant flowing through the main circuit 29m. A detection signal of the second temperature sensor S2 is input to the control device 25 (see FIG. 1). The control device 25 receives the detection signal of the second temperature sensor S2 and controls the lower shutter mechanism 24 according to the detection signal.

Specifically, in the control device 25, a predetermined liquid temperature threshold value Tm1 is determined for the liquid temperature in the second cooling circuit 29. As shown in FIG. The control device 25 controls the lower shutter mechanism 24 to open the lower vent 22 when the liquid temperature of the cooling liquid inside the second cooling circuit 29 is equal to or higher than the liquid temperature threshold value Tm1. That is, the control device 25 controls the lower shutter mechanism 24 to open the lower vent 22 when there is a request to cool the drive unit 15 .
Further, when the liquid temperature of the cooling liquid inside the second cooling circuit 29 is less than the liquid temperature threshold value Tm1, the control device 25 closes the lower vent 22 regardless of the oil temperature in the lubricating cooling circuit 30, which will be described later. , the lower shutter mechanism 24 is controlled.

An electric feed pump P2, a transmission 20 (lubricating passage), an electric motor 11 (lubricating passage), and a circuit heat exchange section 33 are arranged in the lubricating cooling circuit 30 . The circuit heat exchange unit 33 is a device that exchanges heat between the lubricating oil flowing through the lubricating cooling circuit 30 and the cooling liquid flowing through the bypass passage 31 of the second cooling circuit 29 . The coolant flowing through the second cooling circuit 29 can radiate heat to the outside air at the second radiator 16 . The lubricating oil flowing through the lubricating cooling circuit 30 is cooled by exchanging heat with the coolant flowing through the second cooling circuit 29 in the circuit heat exchange section 33 .
The lubrication cooling circuit 30 is provided with an oil temperature sensor S3. A detection signal of the oil temperature sensor S3 is input to the valve control device 25A. The valve control device 25A receives a detection signal from the oil temperature sensor S3, and controls opening/closing of the opening/closing valve 32 in the second cooling circuit 29 according to the detection signal.

Specifically, in the valve control device 25A, a predetermined oil temperature threshold value Tk1 is determined for the oil temperature of the lubricating cooling circuit 30 . The valve control device 25A controls the on-off valve 32 to open when the oil temperature of the lubricating oil inside the lubricating cooling circuit 30 is equal to or higher than a predetermined oil temperature threshold value Tk1. That is, when the oil temperature in the lubricating cooling circuit 30 is less than the oil temperature threshold value Tk1, the opening/closing valve 32 in the second cooling circuit 29 blocks the inflow of the cooling liquid to the circuit heat exchange unit 33, and the lubricating cooling circuit 30 When the internal oil temperature reaches or exceeds the oil temperature threshold value Tk1, the coolant is allowed to flow into the circuit heat exchange portion 33 . Therefore, when the oil temperature in the lubricating cooling circuit 30 reaches or exceeds the oil temperature threshold value Tk1, the lubricating oil in the lubricating cooling circuit 30 is cooled by the coolant through the circuit heat exchange portion 33 .
In this embodiment, the control device 25 (shutter control device) that controls the upper shutter mechanism 23 and the lower shutter mechanism 24 and the valve control device 25A that controls the opening/closing valve 32 are separately configured, but they are the same. It may be configured by a control device.

A detection signal for detecting whether or not the air conditioner 12 is operating is input to the control device 25 . Specifically, for example, the pressure on the downstream side of a compressor (not shown) in the refrigerant circuit of the air conditioner 12 is used as a detection signal, and the detection signal is input to the control device 25 .
The controller 25 controls the upper shutter mechanism 23 to open the upper vent 21 when the air conditioner 12 is in operation. As a result, outside air is introduced into the condenser 17 through the upper vent 21, and efficient cooling operation by the air conditioner 12 becomes possible.

Next, an example of control of the cooling system by the control device 25 will be described with reference to FIGS. 4 to 6. FIG.
First, in step S101 of FIGS. 4 to 6, diagnosis (detection) of state quantities (for example, temperature and pressure) of each part of the vehicle is performed.

In step S102 of FIG. 4, it is determined whether or not the oil temperature TATF of the lubricating oil in the lubricating cooling circuit 30 is equal to or higher than a predetermined oil temperature threshold value Tk1. If so, the process proceeds to step S103, and if the lubricating oil temperature TATF is less than the oil temperature threshold value Tk1, the process proceeds to step S104.
In step S<b>103 , the open/close valve 32 in the second cooling circuit 29 is opened to allow the coolant in the second cooling circuit 29 to flow through the circuit heat exchange section 33 . As a result, the lubricating oil in the lubricating cooling circuit 30 is cooled, and the mechanical operating parts such as the transmission 20 and the electric motor 11 through which the lubricating oil flows are cooled.
On the other hand, in step S104, the open/close valve 32 in the second cooling circuit 29 is closed. At this time, heat exchange between the cooling liquid and the lubricating oil in the circuit heat exchange portion 33 is not performed.

After that, in step S105, it is determined whether or not the liquid temperature TwPCU of the coolant in the second cooling circuit 29 is equal to or higher than a predetermined liquid temperature threshold value Tm1. If there is, the process proceeds to step S106, and if the coolant temperature TwPCU is less than the liquid temperature threshold value Tm1, the process proceeds to step S107.
In step S<b>106 , the lower shutter mechanism 24 opens the lower vent 22 to let outside air flow to the second radiator 16 through the lower vent 22 . As a result, the heat of the coolant in the second cooling circuit 29 is radiated to the outside air in the second radiator 16 . As a result, the drive unit 15 of the electric motor 11 is efficiently cooled. At this time, the outside air that has passed through the lower vent 22 flows through the cooling duct 28 to the engine 10, the electric motor 11, and other peripheral components as cooling air.
On the other hand, in step S<b>107 , the lower shutter mechanism 24 closes the lower vent 22 . As a result, an increase in running resistance caused by running wind flowing into the lower vent 22 is suppressed.
After step S106 or step S107 is executed, the process returns to step S101.

In step S201 of FIG. 5, it is determined whether or not the pressure PD directly below the compressor in the refrigerant circuit of the air conditioner 12 is equal to or higher than a predetermined pressure threshold value Pj1. , the process proceeds to step S202, and when the pressure PD directly under the compressor is less than the pressure threshold value Pj1, the process proceeds to step S203.
In step S<b>202 , the upper shutter mechanism 23 opens the upper vent 21 to let the outside air flow to the condenser 17 of the air conditioner 12 through the upper vent 21 . As a result, the heat of condensation of the refrigerant is radiated to the outside air by the condenser 17, and efficient cooling operation and dehumidifying operation of the air conditioner 12 are enabled.
On the other hand, in step S<b>203 , the upper shutter mechanism 23 closes the upper vent 21 . As a result, an increase in running resistance caused by running wind flowing into the upper vent 21 is suppressed.
After step S202 or step S203 is executed, the process returns to step S101.

In step S302 of FIG. 6, it is determined whether or not the liquid temperature Tw1 of the cooling liquid of the engine 10 (the cooling liquid in the first cooling circuit) is equal to or higher than a predetermined first threshold value Tn1. If it is equal to or higher than Tn1, the process proceeds to step S303, and if the liquid temperature Tw1 is less than the first threshold value Tn1, the process proceeds to step S304. In step S<b>304 , the upper shutter mechanism 23 opens the upper vent 21 . As a result, an increase in running resistance caused by running wind flowing into the upper vent 21 is suppressed.
In step S303, it is determined whether the liquid temperature Tw1 of the coolant of the engine 10 (the coolant in the first cooling circuit) is equal to or higher than a predetermined second threshold Tn2. If so, the process proceeds to step S305, and if the liquid temperature Tw1 is less than the second threshold value Tn2, the process proceeds to step S306.
In step S305, the upper and lower vents 21 and 22 are opened by the upper shutter mechanism 23 and the lower shutter mechanism 24, and outside air is allowed to flow to the first radiator 14 through the upper and lower vents 21 and 22. As a result, a large amount of outside air passes through the first radiator 14 to efficiently cool the coolant of the engine 10 .
On the other hand, in step S<b>306 , the upper shutter mechanism 23 opens the upper ventilation port 21 to allow outside air to flow into the upper region of the first radiator 14 through the upper ventilation port 21 . As a result, the coolant of the engine 10 is cooled through the first radiator 14 .
After any one of step S304, step S304, and step S305 is executed, the process returns to step S101.

(Effect of Embodiment)
As described above, in the vehicle 1 of the present embodiment, when there is a request to cool the drive unit 15 of the electric motor 11 , the control device 25 opens the lower vent 22 facing the second radiator 16 . It controls the shutter mechanism 24 . Therefore, in the vehicle 1 of the present embodiment, an appropriate flow rate of outside air can be taken into the cooling portion of the drive source according to the operating conditions of the drive source of the vehicle.

Further, in the vehicle 1 of the present embodiment, when the liquid temperature TwPCU inside the second cooling circuit 29 that flows the cooling liquid to the second radiator 16 is equal to or higher than the predetermined liquid temperature threshold value Tm1, the control device 25 is controlled to open the lower shutter mechanism 24 . Therefore, when the liquid temperature TwPCU inside the second cooling circuit 29 becomes equal to or higher than a predetermined liquid temperature threshold value Tm1 as the electric motor 11 is driven, the lower shutter mechanism 24 opens the lower vent 22 to allow the air to pass through the lower vent 22 . Outside air comes to flow into the second radiator 16 . Therefore, when the vehicle 1 of the present embodiment is adopted, even when the engine 10 is not driven, the second radiator 16, which is a cooling portion of the drive unit 15 of the electric motor 11, can be efficiently cooled by an appropriate flow rate of outside air. can cool well.

In the vehicle 1 of the present embodiment, a cooling duct 28 is arranged at a position facing the lower vent 22 to bypass the first radiator 14 and the second radiator 16 and allow outside air to flow into the engine room 2 . Therefore, when the lower vent 22 is opened, the peripheral parts (eg, the mount part 5, the steering part 6, the transmission 20) in the engine room 2 can be efficiently cooled through the cooling duct 28.

Further, in the vehicle 1 of the present embodiment, when the oil temperature TATF of the lubricating oil in the lubricating cooling circuit 30 reaches or exceeds the predetermined oil temperature threshold value Tk1, the valve control device 25A opens and closes the second cooling circuit 29 for cooling the drive unit 15. The valve 32 is opened to allow the coolant in the second cooling circuit 29 cooled by the second radiator 16 to flow to the circuit heat exchange section 33 . As a result, in the circuit heat exchange unit 33, heat is exchanged between the coolant in the second cooling circuit 29 and the lubricating oil in the lubricating cooling circuit 30, so that the lubricating oil in the lubricating cooling circuit 30 can be cooled. . Therefore, when this configuration is adopted, the outside air cooling the second radiator 16 through the lower vent 22 can suppress the temperature rise of the lubricating liquid in the lubricating cooling circuit 30 to a predetermined oil temperature threshold value Tk1 or more. can.

Further, in the present embodiment, when the liquid temperature of the second cooling circuit 29 is less than the predetermined liquid temperature threshold value Tm1, regardless of the oil temperature inside the lubricating cooling circuit 30, the control device 25 closes the lower vent 22. controls the lower shutter mechanism 24 . Therefore, when the liquid temperature of the second cooling circuit 29 is less than the predetermined liquid temperature threshold value Tm1, the lower vent 22 is closed, thereby quickly raising the temperature of the cooling liquid in the second cooling circuit 29 to an appropriate temperature. can be made
Further, since the liquid temperature of the coolant in the second cooling circuit 29 at this time is low (temperature less than the predetermined liquid temperature threshold Tm1), the oil temperature TATF of the lubricating oil in the lubricating cooling circuit 30 is the predetermined oil temperature. The lubricating oil in the lubricating cooling circuit 30 can be cooled through the circuit heat exchange unit 33 when the threshold value Tk1 or more is reached and heat exchange is performed by the circuit heat exchange unit 33 .

Further, in the vehicle 1 of the present embodiment, when the temperature of the liquid inside the first cooling circuit for cooling the engine is equal to or higher than the first threshold value Tn1 and lower than the second threshold value Tn2, only the upper vent 21 is closed by the upper shutter mechanism 23. opened by Therefore, the first radiator 14 can be cooled to an appropriate temperature by the outside air passing through the upper vent 21, and an increase in running resistance of the vehicle due to the inflow of running wind into the lower vent 22 can be suppressed. can.

Furthermore, in the vehicle 1 of the present embodiment, when the liquid temperature inside the first cooling circuit for cooling the engine is equal to or higher than the second threshold value Tn2, the upper vent 21 and the lower vent 22 are connected to the upper shutter mechanism 23 and the lower shutter. It is opened by mechanism 24 . Therefore, the coolant in the first radiator 14 can be quickly cooled by a large amount of outside air passing through the upper vent 21 and the lower vent 22, and the peripheral parts can be efficiently cooled.

In addition, in the vehicle 1 of the present embodiment, the first radiator 14 faces both the upper vent 21 and the lower vent 22, so when the upper vent and the lower vent are opened, the air passing through them passes through. A wide range of the first radiator 14 can be efficiently cooled by the outside air. Therefore, when this configuration is adopted, the cooling performance of the first radiator 14 for cooling the engine can be effectively switched by controlling the upper shutter mechanism 23 and the lower shutter mechanism 24 .

Further, in the vehicle 1 of the present embodiment, when the air conditioner 12 is in operation, the upper vent 21 is opened by the upper shutter mechanism 23 and the condenser 17 of the air conditioner 12 is cooled by outside air. Therefore, when this configuration is adopted, the heat dissipation function of the capacitor 17 can be ensured regardless of the temperature of the coolant flowing through the first radiator 14 for cooling the engine.

The present invention is not limited to the above-described embodiments, and various design changes are possible without departing from the gist of the present invention.

1... Vehicle 5... Mount parts (peripheral parts)
6... Steering parts (peripheral parts)
10... Engine (internal combustion engine)
DESCRIPTION OF SYMBOLS 11... Electric motor 12... Air conditioner 14... 1st radiator 15... Drive unit 16... 2nd radiator 17... Capacitor 20... Transmission (peripheral parts)
21 Upper vent 22 Lower vent 23 Upper shutter mechanism 24 Lower shutter mechanism 25 Control device (shutter control device)
25A... Valve control device 28... Cooling duct 29... Second cooling circuit 30... Lubricating cooling circuit 31... Bypass passage 32... Open/close valve 33... Circuit heat exchange unit Tn1... First threshold value Tn2... Second threshold value Tm1... Predetermined liquid temperature Threshold Tk1: Predetermined oil noise threshold

Claims (8)

an internal combustion engine and an electric motor, which are driving sources of the vehicle;
An upper shutter mechanism that opens and closes the upper vent located in the front of the vehicle,
a lower shutter mechanism for opening and closing a lower vent disposed below the upper vent in the front of the vehicle;
a first radiator arranged to face at least the upper vent and dissipating heat of a cooling liquid for cooling the internal combustion engine to the outside air;
a second radiator disposed facing the lower vent for radiating the heat of the cooling liquid for cooling the drive unit of the electric motor to the outside;
a shutter control device that controls the upper shutter mechanism and the lower shutter mechanism,
The vehicle, wherein the shutter control device controls the lower shutter mechanism so as to open the lower vent when there is a request to cool the drive unit. The shutter control device controls the lower shutter mechanism so as to open the lower vent when the liquid temperature inside the second cooling circuit for flowing the cooling liquid to the second radiator is equal to or higher than a predetermined liquid temperature threshold. A vehicle according to claim 1, characterized by: At a position facing the lower vent, a cooling duct for bypassing the first radiator and the second radiator and allowing outside air to flow is provided in a peripheral part located behind the first radiator and the second radiator. 2. Vehicle according to claim 1, characterized in that it is arranged. a transmission for shifting power of at least one of the internal combustion engine and the electric motor;
a lubrication cooling circuit for lubricating and cooling the transmission;
a circuit heat exchange unit that exchanges heat between the second cooling circuit and the lubricating cooling circuit;
an opening/closing valve interposed in a bypass passage for flowing the cooling liquid of the second cooling circuit to the circuit heat exchange portion;
a valve control device that controls the opening and closing valve,
2. The vehicle according to claim 1, wherein the valve control device controls the on-off valve to open when the oil temperature of the lubricating oil inside the lubricating cooling circuit is equal to or higher than a predetermined oil temperature threshold. . The shutter control device closes the lower vent port regardless of the oil temperature inside the lubricating cooling circuit when the liquid temperature of the second cooling circuit is less than the predetermined liquid temperature threshold. 5. The vehicle according to claim 4, wherein the vehicle controls the When the liquid temperature inside the first cooling circuit for flowing cooling liquid to the first radiator is equal to or higher than a first threshold value and lower than a second threshold value, the shutter control device opens the upper vent and controlling the upper shutter mechanism and the lower shutter mechanism to close the vent;
When the liquid temperature inside the first cooling circuit is equal to or higher than the second threshold, the shutter control device controls the upper shutter mechanism and the lower shutter mechanism so as to open the upper vent and the lower vent. 2. The vehicle according to claim 1, wherein: 7. The vehicle according to claim 6, wherein said first radiator faces said upper vent and said lower vent. further comprising a condenser arranged to face the upper vent and dissipating condensation heat of the refrigerant flowing through the refrigerant circuit of the air conditioner to the outside,
2. The vehicle according to claim 1, wherein the shutter control device controls the upper shutter mechanism to open the upper vent when the air conditioner is in operation.

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