WO2020111004A1

WO2020111004A1 - Vehicle-mounted cooling system control device and vehicle-mounted cooling system

Info

Publication number: WO2020111004A1
Application number: PCT/JP2019/045989
Authority: WO
Inventors: 祥紀坪井; 浩輔馬場
Original assignee: 株式会社デンソー
Priority date: 2018-11-29
Filing date: 2019-11-25
Publication date: 2020-06-04

Abstract

This vehicle-mounted cooling system comprises: an air-conditioning refrigerant circuit (31) that is provided with a refrigerant passage (32), a compressor (33), a heat-source-side heat exchanger (34), and a use-side heat exchanger (35); a battery (51); and a battery cooling unit (52) that cools the battery by circulating a refrigerant. The control device (60) controls the driving state of the compressor on the basis of an air conditioning request and a battery cooling request. The control device is provided with: an abnormality determination unit that determines if an abnormality has occurred in the air conditioning refrigerant circuit; and a control mode change unit that changes the control mode of the refrigerant circulation in the air-conditioning refrigerant circuit while continuing to cool the battery with the battery cooling unit under a situation where there is a battery cooling request and it is determined that the abnormality has occurred.

Description

In-vehicle cooling system control device and in-vehicle cooling system

Cross-reference of related applications

This application is based on Japanese application No. 2018-224234 filed on November 29, 2018 and Japanese application No. 2019-196040 filed on October 29, 2019, and the description content is here. Is used.

The present disclosure relates to a control device for a vehicle-mounted cooling system and a vehicle-mounted cooling system.

Conventionally, in a vehicle having an air-conditioning refrigerant circuit for air-conditioning a vehicle interior, a technology has been proposed for cooling a battery by using a refrigerant circulating in the air-conditioning refrigerant circuit. Further, if the battery cannot be cooled due to the occurrence of an abnormality in the cooling system that cools the battery, there is concern that the battery may deteriorate due to an excessive rise in the battery temperature. Therefore, measures have been proposed.

For example, in the technology described in Patent Document 1, in a vehicle thermal management system used for an electric vehicle, a battery refrigerant loop that cools a battery with a battery refrigerant is provided, and air in the vehicle compartment is provided in the battery refrigerant loop. A heat exchanger for exchanging heat between the air in the ventilation drafter discharged to the outside of the vehicle and the refrigerant for the battery is provided. Further, in the battery refrigerant loop, the state in which the battery refrigerant flows through the heat exchanger and the state in which the battery refrigerant bypasses the heat exchanger can be switched by the switching means. When the compressor (compression unit) cannot compress the air-conditioner refrigerant, the battery refrigerant loop is switched to a state in which the battery refrigerant flows through the heat exchanger, whereby the battery refrigerant is cooled by the heat exchanger. Is released to the air in the drafter, thereby suppressing the temperature rise of the battery when the compressor fails.

JP, 2014-37181, A

However, in the technique of Patent Document 1, as a countermeasure when an abnormality occurs in the cooling system, a heat exchanger that causes the battery refrigerant loop to exchange heat between the air in the ventilation drafter and the battery refrigerant is provided. Since it is indispensable to install it, there is a concern that it may cause an increase in physique due to the addition of parts. Further, as the abnormality in the cooling system, not only an abnormality in the compressor but also an abnormality in each part of the air conditioning refrigerant circuit is assumed. For example, a condenser (condenser) for condensing the air conditioner refrigerant is provided with a heat dissipation fan, and when the heat dissipation fan fails, the heat dissipation performance of the condenser deteriorates. It is desired to continuously cool the battery even when such a failure of the heat radiation fan occurs.

The present disclosure has been made in view of the above problems, and its main purpose is to provide a vehicle-mounted cooling that can appropriately cool a battery when an abnormality occurs in an air conditioning refrigerant circuit while simplifying the configuration. It is to provide a control device for the system and a vehicle-mounted cooling system.

The following describes the means for solving the above problems and their effects.

Means 1
An air conditioning refrigerant circuit including a refrigerant passage for circulating a refrigerant, a compressor for compressing the refrigerant, a heat source side heat exchanger, and a use side heat exchanger,
A battery that supplies electric power to in-vehicle electrical equipment,
A battery cooling unit that cools the battery by circulating the refrigerant in the refrigerant passage,
A control device that is applied to a vehicle-mounted cooling system that includes, based on an air conditioning request and a battery cooling request, a control device that controls a driving state of the compressor,
An abnormality determination unit that determines that an abnormality has occurred in the air conditioning refrigerant circuit,
Under the situation where the battery cooling request is generated and it is determined that the abnormality is occurring, the control mode of the refrigerant circulation in the air conditioning refrigerant circuit is changed while continuing the cooling of the battery by the battery cooling unit. A control mode changing unit for
Equipped with.

In an in-vehicle cooling system, when an abnormality of the air conditioning refrigerant circuit occurs due to, for example, a stop failure of a heat dissipation fan or a failure of output reduction, when the circulation of the refrigerant in the air conditioning refrigerant circuit is stopped, the battery is circulated by the refrigerant. Can no longer be cooled and there is concern that the battery temperature will rise excessively. In this respect, according to the above configuration, in the situation where it is determined that the battery cooling request is generated and the abnormality is generated in the air conditioning refrigerant circuit, the battery cooling unit continues to cool the battery and the air conditioning refrigerant circuit operates. The control mode of the refrigerant circulation of is changed. In this case, even if an abnormality occurs in the air-conditioning refrigerant circuit, the refrigerant can be circulated in a mode according to the occurrence of the abnormality. As a result, the battery can be properly cooled when an abnormality occurs in the air conditioning refrigerant circuit while simplifying the configuration.

Note that control of the refrigerant circulation in the air-conditioning refrigerant circuit may include drive control of the compressor and control of an expansion valve that adjusts the amount of refrigerant circulation in the refrigerant passage. Changes in the control mode include changes in the rotation speed of the compressor and changes in the refrigerant circulation amount by the expansion valve.

In the means 2, in the means 1, the control mode changing unit limits the increase in the refrigerant pressure in the refrigerant passage as compared with the time before the abnormality occurs, as the control mode is changed.

When an abnormality occurs in the air-conditioning refrigerant circuit in the vehicle-mounted cooling system, for example, the refrigerant pressure in the refrigerant passage increases due to a decrease in heat dissipation performance in the condenser (condenser) of the air-conditioning refrigerant circuit, and the piping forming the refrigerant passage is There is concern about damage. In this respect, according to the above configuration, when a battery cooling request is made and it is determined that an abnormality has occurred in the air conditioning refrigerant circuit, the control mode is changed so that the refrigerant passage is different from that before the abnormality. The rise in refrigerant pressure at is limited. Accordingly, when an abnormality occurs in the air conditioning refrigerant circuit, it is possible to continuously cool the battery while protecting the pipes and the like forming the refrigerant passage.

In the means 3, in the means 1 or 2, the control mode changing unit limits the increase of the refrigerant pressure in the refrigerant passage as a change of the control mode, and the refrigerant pressure in the refrigerant passage is a predetermined high pressure. The drive of the compressor is limited in order to suppress the pressure increase exceeding the upper limit value.

According to the above configuration, due to the drive limitation of the compressor, the pressure increase of the refrigerant pressure in the refrigerant passage exceeding the predetermined high pressure upper limit value is suppressed. This makes it possible to properly protect the pipes and the like that form the refrigerant passage.

In the means 4, the means 2 or 3 is provided with an air-conditioning restriction unit that restricts the execution of air conditioning by the air-conditioning refrigerant circuit when the increase in the refrigerant pressure in the refrigerant passage is restricted as a change of the control mode.

According to the above configuration, when the increase in the refrigerant pressure in the refrigerant passage is restricted due to the occurrence of an abnormality in the air conditioning refrigerant circuit, the execution of air conditioning by the air conditioning refrigerant circuit is restricted. In this case, for example, when both the air conditioning request and the battery cooling request are generated, the battery cooling request is prioritized. That is, the coolant is circulated in the coolant passage to cool the battery. Thereby, the deterioration of the battery due to the excessive rise of the battery temperature can be suitably suppressed.

In the means 5, in the means 4, the refrigerant passage has a bypass passage which is provided in parallel with the utilization side heat exchanger and supplies the refrigerant to the battery cooling part. It is possible to switch which circulation path of the first circulation path including the first circulation path and the second circulation path that does not include the use-side heat exchanger and includes the bypass passage, in which the refrigerant flows. As a restriction of the air conditioning, the section makes the refrigerant flow in the second circulation path and restricts the refrigerant flow in the first circulation path.

According to the above configuration, when the air conditioning restriction is performed in a state where the cooling in the battery cooling section is prioritized due to the occurrence of an abnormality in the air conditioning refrigerant circuit, the bypass path (battery cooling section) is included as the air conditioning restriction. The refrigerant is allowed to flow in the second circulation path, and the refrigerant is restricted from flowing in the first circulation path including the utilization side heat exchanger. In this case, battery cooling can be preferably performed while restricting air conditioning by suppressing heat exchange in the use side heat exchanger.

In the means 6, in the means 5, the air conditioning limiting unit controls the amount of the refrigerant flowing through the first circulation path and the second circulation path based on the temperature of the battery when the air conditioning is restricted. Adjust the distribution with the amount of flowing refrigerant.

According to the above configuration, not only the battery cooling but also the air conditioning can be suitably performed while considering the degree required for battery cooling.

In the means 7, in any one of the means 4 to 6, the air conditioning restriction unit releases the restriction of the air conditioning based on that the vehicle speed, which is the traveling speed of the vehicle, is higher than a predetermined speed threshold value. Alternatively, the degree of restriction of the air conditioning is reduced.

When the vehicle speed is high, heat is exchanged (radiated) by the running wind in the heat source side heat exchanger, so even if the drive limitation of the compressor is restricted as a change of the control mode of the refrigerant circulation, the battery is cooled. In addition, it becomes possible to perform air conditioning. In this case, for example, it is possible to switch from a state in which the air conditioning is stopped to a state in which the air conditioning is performed as the air conditioning restriction.

In the means 8, in any one of the means 4 to 6, the control mode changing unit limits the increase of the refrigerant pressure in the refrigerant passage as the change of the control mode, and the traveling speed of the vehicle. And the vehicle speed is higher than a predetermined first speed threshold, the degree of restriction of the refrigerant pressure is reduced, and the air conditioning restriction unit uses the second speed threshold where the vehicle speed is higher than the first speed threshold. The degree of restriction of the air conditioning is reduced based on the fact that it is greater than.

According to the above configuration, the degree of limitation of the refrigerant pressure and the degree of limitation of the air conditioning are reduced according to the vehicle speed. In this case, when the vehicle speed increases, the degree of restriction of the refrigerant pressure is reduced first, and then the degree of air conditioning restriction is reduced. Therefore, when an abnormality occurs in the air conditioning refrigerant circuit, it is possible to perform appropriate air conditioning while prioritizing battery cooling.

In the means 9, in any one of the means 1 to 8, the control mode changing unit limits the increase of the refrigerant pressure in the refrigerant passage as the change of the control mode, and the traveling speed of the vehicle. Based on the vehicle speed being greater than a predetermined speed threshold value, the degree of restriction of the refrigerant pressure is reduced.

When the vehicle speed is high, heat is exchanged (radiated) by the running wind in the heat source side heat exchanger, which makes it possible to reduce the degree of refrigerant pressure limitation and increase the degree of battery cooling.

In the means 10, in any one of the means 1 to 9, when it is determined that the abnormality occurs in the situation where the battery cooling request is not generated, based on the vehicle traveling prediction after the present time, A predicting unit that predicts whether or not a situation in which the battery cooling request will be generated is provided, and the control mode changing unit, when the predicting unit predicts that the battery cooling request will be in a situation, Make changes.

According to the above configuration, even if the battery cooling request is not generated due to the occurrence of an abnormality in the air conditioning refrigerant circuit or the like, preliminary battery cooling can be performed based on the necessity of battery cooling after the present time. .. In this case, even if the amount of heat generated by the battery suddenly increases due to a sudden increase in electric load or the like in a situation where an abnormality has occurred in the air-conditioning refrigerant circuit, the increase in battery temperature can be suppressed. That is, even when the cooling is insufficient and the temperature may rise, it is possible to suppress the excessive rise of the battery temperature during traveling. This can protect the battery.

In the means 11, in the means 10, the electric device is a rotating electric machine that serves as a power source for traveling the vehicle, and the predicting unit is in a situation where the battery cooling request is generated based on the traveling destination of the vehicle. Predict whether or not.

For example, when the traveling destination of the vehicle is far, the driving load of the rotating electric machine is higher than when the destination is near, and the temperature of the battery is likely to rise. In addition, when the traveling route to the traveling destination includes an uphill road, the driving load of the rotating electric machine also increases, and the temperature of the battery is likely to rise. In this case, by predicting whether or not the battery cooling request will be generated based on the traveling destination of the vehicle, it is possible to preferably cope with the rise in the battery temperature due to the sudden change in the traveling load.

In the means 12, in the

means

10 or 11, the control mode changing unit limits the increase of the refrigerant pressure in the refrigerant passage as the change of the control mode, and it is predicted that the battery cooling request will be generated. When the refrigerant pressure is limited based on this, the degree of restriction of the refrigerant pressure is increased as compared with the case where the refrigerant pressure is limited based on the fact that the battery cooling request is actually generated.

According to the above configuration, when it is predicted that a battery cooling request will be generated, by increasing the degree of restriction of the refrigerant pressure in the refrigerant passage, for example, the compressor rotation speed is limited to low rotation, and battery cooling is reduced. The degree is reduced. In this case, battery cooling can be appropriately performed while suppressing excessive battery cooling and excessive air conditioning restriction.

In the means 13, in the means 1, the control mode changing unit includes an air conditioning restricting unit that restricts execution of air conditioning by the air conditioning refrigerant circuit as a change of the control mode.

If a refrigerant leak occurs as an abnormality in the air-conditioning refrigerant circuit, the heat conversion capacity in the air-conditioning refrigerant circuit may be reduced. Can be supplemented. As a result, the battery can be cooled in the most appropriate state when an abnormality occurs.

In the means 14, in the means 13, the air conditioning limiting unit increases the output of the compressor under the situation where the air conditioning request and the battery cooling request are generated and the abnormality is determined to occur. Also restricts the execution of the air conditioning on the condition that the air conditioning request and the battery cooling request are not satisfied.

In this case, by considering the situation where the air conditioning request and the battery cooling request occur and the compressor driving state, it is possible to implement the appropriate air conditioning restriction while continuing the battery cooling.

In the means 15, when it is determined in the means 14 that one or both of the air conditioning request and the battery cooling request have not occurred, the abnormality is determined, based on the vehicle traveling prediction after the current time point. A prediction unit that predicts whether or not both the air conditioning request and the battery cooling request will occur, and the control mode changing unit causes the prediction unit to generate both the air conditioning request and the battery cooling request. When it is predicted that the situation will occur, the surplus air conditioning for the current request is performed before both the air conditioning request and the battery cooling request occur.

When the vehicle is running, it can be predicted that both air conditioning demand and battery cooling demand will occur in the future due to changes in the outside air temperature from the present time onward and running conditions such as high-speed running. Further, it can be predicted that, at the time of occurrence of an abnormality in the air conditioning refrigerant circuit, it becomes impossible to satisfy both the future air conditioning request and the battery cooling request. In this case, before the air-conditioning request and the battery cooling request both occur, the surplus air-conditioning (excessive air-conditioning) is performed for the current request, so that the vehicle interior environment can be improved.

In the means 16, in any one of the means 13 to 15, the refrigerant passage has a bypass passage which is provided in parallel with the utilization side heat exchanger and which supplies the refrigerant to the battery cooling part. Switching between which of the first circulation path including the use-side heat exchanger and the second circulation path including the bypass passage that does not include the use-side heat exchanger can be switched to the state in which the refrigerant flows. It is possible that the air-conditioning restriction unit limits the air-conditioning so that the refrigerant flows in the second circulation path and restricts the refrigerant flowing in the first circulation path.

In the means 17, in the means 16, the air conditioning restriction unit determines the amount of the refrigerant flowing through the first circulation path and the second circulation path based on the temperature of the battery when the air conditioning is restricted. Adjust the distribution with the amount of flowing refrigerant.

In the means 18, in any one of the means 13 to 17, the air conditioning limiting unit releases the air conditioning limitation based on that the vehicle speed, which is the traveling speed of the vehicle, is higher than a predetermined speed threshold value. Alternatively, the degree of restriction of the air conditioning is reduced.

Means 19 includes a parameter acquisition unit for acquiring the drive state of the compressor or the refrigerant pressure in the refrigerant passage as a control parameter in any one of the means 1 to 18, and the control mode changing unit is the abnormal condition. The control mode is changed based on the control parameter after the occurrence of.

When an abnormality occurs in the air conditioning refrigerant circuit, the heat exchange state (heat dissipation state) in the heat source side heat exchanger differs from that in the normal state of the air conditioning refrigerant circuit, and the drive state of the compressor and the refrigerant passage A change occurs in the refrigerant pressure inside. In this case, on the basis of the drive condition of the compressor or the control parameter indicating the refrigerant pressure in the refrigerant passage, the change in the refrigerant pressure after the occurrence of the abnormality in the air conditioning refrigerant circuit is grasped and the control of the refrigerant circulation in the air conditioning refrigerant circuit is performed. By changing the mode, battery cooling can be appropriately performed according to the driving state of the compressor, and thus the magnitude of the refrigerant pressure.

In the means 20, in any one of the means 1 to 19, the abnormality determining unit is configured such that the abnormality determination unit stops the radiating fan that blows air to the heat source side heat exchanger in the air conditioning refrigerant circuit or reduces the output, the heat source side. It is determined that an abnormality has occurred in the air conditioning refrigerant circuit based on at least one of heat radiation abnormality due to clogging in the heat exchanger and refrigerant leakage abnormality in the air conditioning refrigerant circuit.

The causes of abnormalities in the air conditioning refrigerant circuit are that the heat dissipation fan has stopped or the output is reduced, and that there is heat dissipation abnormality due to clogging of the heat source side heat exchanger. It is conceivable that there is a refrigerant leakage abnormality. Therefore, by determining the occurrence of an abnormality in the air conditioning refrigerant circuit based on the occurrence of an abnormality caused by these factors, it is possible to properly understand the occurrence of the abnormality, and to appropriately perform the battery cooling at the time of the abnormality. can do.

In an in-vehicle cooling system including the air conditioning refrigerant circuit, the battery, the battery cooling unit, and the control device according to any one of means 1 to 20, while simplifying the configuration, the air conditioning refrigerant circuit The battery can be properly cooled when an abnormality occurs in the.

The above and other objects, features and advantages of the present disclosure will become more apparent by the following detailed description with reference to the accompanying drawings. The drawing is
FIG. 1 is a configuration diagram showing a cooling water circuit and an air conditioning refrigerant circuit in a vehicle, FIG. 2 is a block diagram showing an electrical configuration relating to battery cooling, FIG. 3 is a flowchart showing a procedure for battery cooling, FIG. 4 is a diagram showing the relationship between the refrigerant pressure and the compressor rotation speed, 5A is a diagram showing the relationship between the vehicle speed and the rotation speed correction value ΔN1, and FIG. 5B is a diagram showing the relationship between the vehicle speed and the rotation speed correction value ΔN2. FIG. 6 is a time chart for explaining the battery cooling process more specifically, FIG. 7 is a flowchart showing a battery cooling process procedure according to the second embodiment. FIG. 8 is a diagram showing a distribution ratio between the amount of the refrigerant flowing through the first circulation path and the amount of the refrigerant flowing through the second circulation path, FIG. 9 is a time chart for specifically explaining the battery cooling process in another example, FIG. 10 is a flowchart showing a processing procedure of battery cooling in another example, FIG. 11 is a time chart for specifically explaining the battery cooling process in another example, FIG. 12 is a flowchart showing a processing procedure of battery cooling in another example, FIG. 13 is a time chart for specifically explaining the battery cooling process in another example, FIG. 14 is a flowchart showing a processing procedure of battery cooling in another example, FIG. 15 is a flowchart showing a processing procedure of battery cooling in another example, FIG. 16 is a flowchart showing a processing procedure of battery cooling in another example.

(First embodiment)
Embodiments will be described below with reference to the drawings. The present embodiment is embodied as a vehicle-mounted cooling system that cools a battery that supplies electric power to a rotating electric machine in a hybrid vehicle that has an engine (internal combustion engine) and a rotating electric machine as power sources. As is well known, in a hybrid vehicle, for example, based on the vehicle running state, an engine mode in which an engine is used as a running power source, an EV mode in which a rotating electrical machine is used as a running power source, and an engine and a rotating electrical machine are used as running power sources. It is possible to switch to the running HV mode.

FIG. 1 is a configuration diagram showing

cooling water circuits

12 and 22 for cooling an engine 11 and a rotating electric machine 21 in a vehicle 10, and an air conditioning refrigerant circuit 31 using an air conditioning refrigerant. In the present embodiment, the rotary electric machine 21 corresponds to an in-vehicle electric device.

As shown in FIG. 1, the vehicle 10 has a first cooling water circuit 12 that cools the engine 11 and a second cooling water circuit 22 that cools the rotating electric machine 21 as a cooling water cooling system. The first cooling water circuit 12 has a cooling water passage 13 for circulating engine cooling water, a cooling water pump 14 and a radiator 15 provided in the cooling water passage 13. The second cooling water circuit 22 also has a cooling water passage 23 for circulating the motor cooling water, a cooling water pump 24 and a radiator 25 provided in the cooling water passage 23. Note that the second cooling water circuit 22 may cool the inverter that drives the rotary electric machine 21 mainly by battery power. However, in addition to the inverter, the heat generating portion such as the armature winding in the rotating electric machine body may be cooled.

In the vehicle 10, the air conditioning refrigerant circuit 31 includes a refrigerant passage 32 for circulating a refrigerant such as a CFC-based refrigerant, an electric compressor 33 for compressing the refrigerant, and a condenser 34 (condenser) for cooling and liquefying the refrigerant. And an evaporator 35 (evaporator) that vaporizes the refrigerant. Further, in the air conditioning refrigerant circuit 31, the condenser 34 is provided with a heat radiation fan 36 that blows air for heat radiation in the condenser 34. The condenser 34 corresponds to a “heat source side heat exchanger”, and the evaporator 35 corresponds to a “use side heat exchanger”. An expansion valve 38 may be provided on the downstream side of the condenser 34 in the refrigerant passage 32. A refrigerant pressure sensor 37 that detects the refrigerant pressure is provided in the refrigerant passage 32.

In addition, in each of the cooling

water circuits

12 and 22 described above, the

radiators

15 and 25 are integrated as a heat radiation unit, or the condensers 34 are integrated as a heat radiation unit in addition to the

radiators

15 and 25. The heat radiation fan 36 may radiate heat in these heat radiation unit units.

In the present embodiment, the air conditioning refrigerant circuit 31 is provided not only for air conditioning (cooling/heating) of the vehicle interior but also for cooling the battery 51 that supplies electric power to the vehicle-mounted electric equipment. The electric device mounted on the vehicle includes the rotating electric machine 21. The battery 51 is provided as a part of the battery pack 50, and the battery pack 50 is provided with a temperature adjustment unit 52 that adjusts the battery temperature. The temperature adjustment unit 52 corresponds to a battery cooling unit that cools the battery 51 by circulating the refrigerant in the refrigerant passage 32, and has, for example, a heat conversion unit that cools the battery 51 by heat conversion of the refrigerant.

Specifically, as a configuration related to battery cooling, the refrigerant passage 32 has a bypass passage 41 in parallel with the evaporator 35 on the upstream side of the compressor 33, and the temperature adjustment unit of the battery pack 50 is provided in the bypass passage 41. 52 is provided. An electromagnetic valve 42 is provided in the refrigerant passage 32, and by the electromagnetic valve 42, a first circulation path L1 including the evaporator 35 and a second circulation path L2 including the bypass passage 41 not including the evaporator 35 are provided. It is possible to switch which of the above circulation paths is used to flow the refrigerant. Accordingly, in the refrigerant passage 32, a state in which the refrigerant flows only in the first circulation path L1, a state in which the refrigerant flows only in the second circulation path L2, and a state in which the refrigerant flows in the first circulation path L1 and the second circulation path L2. It is possible to switch between and.

When the battery is cooled, the refrigerant flows only through the second circulation path L2 or the refrigerant flows through the first circulation path L1 and the second circulation path L2 so that the refrigerant flows through the bypass passage 41. The refrigerant circulates. In this case, the battery 51 is cooled by heat exchange in the temperature control unit 52. The temperature control unit 52 may be composed of a chiller having a circulation passage for circulating a heat fluid such as cooling water. For example, an evaporator provided on the bypass passage 41 and the evaporator. The battery 51 may be cooled by a circulation passage that circulates a thermal fluid (cooling water or the like) that is cooled by heat exchange, and the thermal fluid that circulates in the circulation path.

FIG. 2 is a block diagram showing an electrical configuration relating to battery cooling. In FIG. 2, the control device 60 includes a microcomputer having a CPU and various memories, as is well known, and controls driving of the compressor 33, the heat radiation fan 36, and the solenoid valve 42 based on input signals from various sensors. To do. In addition to the refrigerant pressure sensor 37, the sensors include an outside air temperature sensor 61 that detects the outside air temperature, a vehicle interior temperature sensor 62 that detects the vehicle interior temperature, a rotation speed sensor 63 that detects the rotation speed of the compressor 33, and a battery temperature. A battery temperature sensor 64 for detecting, a current sensor 65 for detecting a current flowing through the compressor 33, a vehicle speed sensor 66 for detecting the speed (vehicle speed) of the vehicle 10 and the like are included.

The control device 60 controls the drive state of the compressor 33 based on the air conditioning request and the battery cooling request. That is, the control device 60 performs the rotation speed control of the compressor 33 based on the air conditioning control parameters such as the outside air temperature, the vehicle interior temperature, the set temperature, and the set air volume when the air conditioning request is made. Further, the controller 60 controls the rotation speed of the compressor 33 based on the battery temperature when the battery cooling request is generated. At this time, the control device 60 sets the target rotation speed of the compressor 33 based on the air conditioning control parameter and the battery temperature, and performs feedback control so that the actual rotation speed detected by the rotation speed sensor 63 matches the target rotation speed. Should be implemented.

Further, the control device 60 controls the heat radiation state in the condenser 34 by driving the heat radiation fan 36 when the compressor 33 is driven in response to the air conditioning request and the battery cooling request. At this time, the heat radiation fan 36 controls on/off of the driving state. Alternatively, in a configuration in which the driving state of the heat radiation fan 36 can be adjusted in a plurality of stages (for example, three stages of low, middle, and high), the driving state of the heat radiation fan 36 is controlled in one of a plurality of stages.

By the way, in the vehicle-mounted cooling system, when an abnormality in the air conditioning refrigerant circuit 31, for example, a stop failure of the heat radiating fan 36 or a failure of output reduction occurs, the refrigerant passage 32 is deteriorated due to a decrease in heat radiation performance of the condenser 34 of the air conditioning refrigerant circuit 31. The refrigerant pressure inside rises. At this time, it is conceivable to stop the driving of the compressor 33 in order to suppress an excessive rise in the refrigerant pressure in the refrigerant pipe forming the refrigerant passage 32. However, when the driving of the compressor 33 is stopped, the battery 51 cannot be cooled by the circulation of the refrigerant, and there is a concern that the battery temperature may excessively rise.

Therefore, in the present embodiment, it is determined that an abnormality has occurred in the air conditioning refrigerant circuit 31 based on the fact that the heat dissipation fan 36 is stopped or has a failure that reduces the output. Then, under the situation where the battery cooling request is generated and it is determined that the air conditioning refrigerant circuit 31 is abnormal, the refrigerant pressure in the refrigerant passage 32 is suppressed while increasing the pressure exceeding the predetermined high pressure upper limit value. The compressor 33 is driven with the drive being restricted. This process is a fail-safe process when a failure occurs in the heat dissipation fan 36.

According to the drive limitation of the compressor 33 when an abnormality occurs in the air conditioning refrigerant circuit 31, the cooling of the battery 51 by the temperature control unit 52 is continued in a state where the control mode of the refrigerant circulation in the air conditioning refrigerant circuit 31 is changed. .. At this time, due to the drive restriction of the compressor 33, the increase in the refrigerant pressure in the refrigerant passage 32 is restricted as compared with before the abnormality occurred in the air conditioning refrigerant circuit 31.

When performing the compressor drive restriction, the drive state of the compressor 33 or the refrigerant pressure in the refrigerant passage 32 during the compressor drive is acquired as a control parameter, and the compressor is determined based on the control parameter after the stop failure of the heat radiation fan 36 occurs. The degree of drive restriction of 33 may be adjusted. At this time, for example, based on the refrigerant pressure detected by the refrigerant pressure sensor 37, it is grasped that the refrigerant pressure is changing up or down after the occurrence of the stop failure of the heat dissipation fan 36, and based on the result, the compressor 33 is changed. It is advisable to adjust the degree of the drive limitation, that is, the limit rotation speed of the compressor 33. The refrigerant pressure may be estimated based on the compressor energization current detected by the current sensor 65.

Further, in the present embodiment, when the drive of the compressor 33 is restricted, the execution of air conditioning by the air conditioning refrigerant circuit 31 is restricted. Specifically, in the air-conditioning refrigerant circuit 31, the electromagnetic valve 42 causes the refrigerant to flow in the first circulation path L1 including the evaporator 35 and the second circulation path L2 including the bypass passage 41 not including the evaporator 35. It is possible to switch to a state in which the refrigerant flows. Then, as the restriction of the air conditioning, the refrigerant is allowed to flow in the second circulation path L2 and the refrigerant is restricted from flowing in the first circulation path L1.

FIG. 3 is a flowchart showing a battery cooling processing procedure, and this processing is repeatedly executed by the control device 60 at a predetermined cycle.

In FIG. 3, in step S11, it is determined whether or not there is a failure in the radiating fan 36 that causes a stop or output reduction as an abnormality in the air conditioning refrigerant circuit 31. In this failure determination, for example, when the heat dissipation fan 36 is not energized even though a drive command is issued to the heat dissipation fan 36, it is determined that there is a stop failure. Further, in the configuration in which the drive of the heat radiation fan 36 is controlled in a plurality of stages, if the heat radiation fan 36 is driven at a low speed even though a high speed drive command is issued, an output reduction failure may occur. It is determined that there is. Note that step S11 corresponds to the “abnormality determination unit”.

If no failure has occurred in the heat radiation fan 36, step S11 is denied and the process proceeds to step S12 to drive the compressor 33 normally. At this time, the control device 60 executes the rotation speed control of the compressor 33 based on the air conditioning request and the battery cooling request.

If the heat dissipation fan 36 has a failure, affirmative determination is made in step S11 and the process proceeds to step S13. In step S13, it is determined whether a battery cooling request has been issued. In step S13, for example, if the battery temperature is equal to or higher than the predetermined temperature, it is determined that the battery cooling request is generated. The predetermined temperature is a temperature determined based on the temperature at which the output of the battery 51 is limited, and is 40° C., for example. If the battery cooling request has not been issued, the process proceeds to step S14, and the compressor 33 is brought into a non-driving state. At this time, if air conditioning is being performed according to the air conditioning request at the time when the radiation fan 36 fails, the air conditioning is stopped by stopping the driving of the compressor 33.

If a battery cooling request is made, the process proceeds to step S15, and it is determined whether the refrigerant pressure is equal to or higher than the first threshold value TH1. The first threshold value TH1 is, for example, a high pressure upper limit value within a range that suppresses high pressure breakage of the refrigerant pipe. Alternatively, when the safety valve is provided in the refrigerant pipe, the first threshold value TH1 is determined based on the valve opening pressure of the safety valve and is a pressure slightly lower than the valve opening pressure. If the refrigerant pressure is equal to or higher than the first threshold value TH1, the process proceeds to step S16, and the compressor rotation speed is limited to the limited rotation speed N1. At this time, the control device 60 performs the rotation speed feedback control with the target rotation speed of the compressor 33 as the limited rotation speed N1. The limited rotation speed N1 is preferably a rotation speed lower than the compressor rotation speed when only the battery cooling request is generated among the air conditioning request and the battery cooling request.

After that, in step S17, if an air conditioning request is made, the air conditioning is stopped. Specifically, in the air conditioning refrigerant circuit 31, the refrigerant is allowed to flow in the second circulation path L2 and the refrigerant is stopped from flowing in the first circulation path L1. This limits the implementation of air conditioning. For example, by controlling the electromagnetic valve 42, it is preferable that the refrigerant flow in the first circulation path L1 in addition to the second circulation path L2 while limiting the refrigerant flow rate. In addition, in step S17, instead of stopping the air conditioning, the degree of air conditioning may be limited (reduced) while continuing the air conditioning. Step S17 corresponds to the "air conditioning restriction unit".

If the refrigerant pressure is less than the first threshold TH1, the process proceeds to step S18, and it is determined whether the refrigerant pressure is the second threshold TH2 or more. The second threshold TH2 is a pressure threshold lower than the first threshold TH1. Then, if the refrigerant pressure is equal to or higher than the second threshold value TH2, the process proceeds to step S19, and the limiting rotation speed of the compressor 33 is set based on the refrigerant pressure. At this time, for example, the limiting rotation speed of the compressor 33 may be set using the relationship of FIG. In FIG. 4, the relationship between the refrigerant pressure and the compressor rotation speed is defined. In the range where the refrigerant pressure is equal to or higher than the first threshold value TH1, the compressor rotation speed is set to the limit rotation speed N1 and the refrigerant pressure is set to the second threshold value. In the range that is equal to or higher than TH2 and lower than the first threshold value TH1, the limited rotation speed is variably set within the range of N1 to N2. In the range of N1 to N2, the limited rotation speed is set such that the higher the refrigerant pressure, the lower the rotation speed. In terms of the degree of limitation of the compressor rotation speed, the compressor rotation speed is controlled such that the higher the refrigerant pressure, the higher the limitation degree.

In steps S16 and S19, the compressor rotation speed is limited to a low rotation speed as compared with the normal time before the abnormality occurs in the air conditioning refrigerant circuit 31, whereby the increase in the refrigerant pressure in the refrigerant passage 32 is restricted. That is, as a result, the control mode of the refrigerant circulation in the air conditioning refrigerant circuit 31 is changed when an abnormality occurs in the air conditioning refrigerant circuit 31.

After that, in step S20, the limit rotation speed of the compressor 33 is corrected based on the vehicle speed. For example, the limiting rotation speed of the compressor 33 may be corrected using the relationship shown in FIG. In FIG. 5A, the relationship between the vehicle speed and the rotation speed correction value ΔN1 is defined, and the rotation speed correction value ΔN1 is set as a positive value in the range where the vehicle speed is equal to or higher than the speed threshold THA. Further, as shown in the figure, the higher the vehicle speed, the larger the rotation speed correction value ΔN1 may be set. Then, the rotation speed correction value ΔN1 is added to the rotation speed limit set in step S19, whereby the rotation speed limit is increased and corrected. According to the correction of the limited rotation speed, the correction degree for reducing the limitation speed of the compressor rotation speed is performed based on the vehicle speed being higher than the speed threshold value THA.

In step S21, it is determined whether an air conditioning request is currently made and the vehicle speed is equal to or higher than the speed threshold THB. The speed threshold THB is a speed value higher than the speed threshold THA. And when step S21 is affirmed, it progresses to step S22 and makes an air conditioning into an operating state.

Specifically, in the air-conditioning refrigerant circuit 31, the air conditioning is activated by setting the refrigerant to flow in the first circulation path L1 in addition to the second circulation path L2. This releases the air conditioning restriction. In controlling the rotation speed of the compressor 33, the limiting rotation speed of the compressor 33 is corrected. For example, the limiting rotation speed of the compressor 33 may be corrected using the relationship shown in FIG. In FIG. 5B, the relationship between the vehicle speed and the rotation speed correction value ΔN2 is defined, and the rotation speed correction value ΔN2 is set as a positive value in the range where the vehicle speed is equal to or higher than the speed threshold value THB. Further, as shown in the figure, the higher the vehicle speed, the larger the rotation speed correction value ΔN2 may be set. Then, the rotational speed correction value ΔN2 is added to the rotational speed limit set in step S19 or the rotational speed limit corrected in step S20, whereby the rotational speed limit is increased and corrected. According to the correction of the limited rotation speed, the correction degree for reducing the limitation speed of the compressor rotation speed is performed based on that the vehicle speed is higher than the speed threshold value THB.

In the relationship between FIG. 5(a) and FIG. 5(b), the speed thresholds THA and THB have a relationship of THA<THB. Therefore, when the vehicle speed increases, the degree of drive limitation of the compressor 33 is reduced first, and then the degree of air conditioning limitation is reduced.

Note that in step S22, a process of reducing the degree of air conditioning restriction may be performed instead of the process of releasing the air conditioning restriction. As a process for reducing the degree of air conditioning restriction, for example, the amount of the refrigerant flowing through the first circulation path L1 may be increased by controlling the solenoid valve 42.

If step S21 is negative, the process proceeds to step S17, and the process of stopping the air conditioning or the process of restricting the implementation of the air conditioning is performed. Note that steps S15 to S22 correspond to the "control mode changing unit".

FIG. 6 is a time chart for explaining the battery cooling process more specifically.

In FIG. 6, at timing t1, the ignition switch of the vehicle 10 is turned on, an initial process is performed to enable the vehicle to travel, and then at timing t2, air conditioning is started in response to an air conditioning request. After the timing t2, the compressor rotation speed is feedback-controlled to the target rotation speed determined according to the content of the air conditioning request each time. As a result, the refrigerant pressure gradually rises. Further, the driving of the heat radiation fan 36 is started. In FIG. 6, the driving state of the heat radiation fan 36 is shown as ON/OFF.

After that, the battery temperature gradually rises as the vehicle runs. Then, at timing t3, a battery cooling request is generated when the battery temperature exceeds a predetermined value, and battery cooling is started in accordance with the battery cooling request. After the timing t3, the compressor rotation speed is controlled according to the air conditioning request and the battery cooling request each time. As a result, the compressor rotation speed and the refrigerant pressure increase in response to the battery cooling request.

After that, at timing t4, an abnormality occurs in the air conditioning refrigerant circuit 31 due to the stop failure (OFF failure) of the heat dissipation fan 36, and the refrigerant pressure in the refrigerant passage 32 decreases as the heat dissipation performance of the condenser 34 of the air conditioning refrigerant circuit 31 decreases. Rises.

At timing t5, the refrigerant pressure becomes higher than the second threshold value TH2, and after that timing t5, the rotation speed of the compressor 33 is controlled by the limited rotation speed set based on the refrigerant pressure. At this time, the higher the refrigerant pressure, the lower the rotational speed of the compressor 33 is set as the rotational speed limit. Further, at the timing t5, the air conditioning is stopped regardless of the fact that the air conditioning request is generated. After the timing t5, the battery temperature gradually rises, but an excessive rise is suppressed. The refrigerant pressure is maintained at a pressure lower than the first threshold TH1 which is the high pressure upper limit value. Although not shown, if the refrigerant pressure reaches the first threshold value TH1, the compressor rotation speed is reduced to the limit rotation speed N1.

Although it is considered that the battery temperature rises due to the energizing current when the compressor 33 is driven, this embodiment assumes that the cooling performance of the cooling system is higher than the temperature rise.

After that, at timing t6, the limit rotation speed of the compressor 33 is increased and corrected as the vehicle speed increases to the speed threshold THA. At this time, the heat radiation of the condenser 34 is promoted by the traveling wind of the vehicle 10, so that the compressor rotation speed can be increased correspondingly without the increase of the refrigerant pressure.

After that, at timing t7, air conditioning is started as the vehicle speed further increases to the speed threshold value THB. At this time, since the vehicle 10 is traveling at a high speed, it is possible to dissipate heat from the condenser 34 required for air conditioning operation, and start of air conditioning is permitted.

According to this embodiment described in detail above, the following excellent effects can be obtained.

Under the situation where the battery cooling request is generated and it is determined that the air conditioning refrigerant circuit 31 is abnormal due to the failure of the heat radiation fan 36, the air conditioning refrigerant circuit is continuously cooled by the temperature adjustment unit 52. The control mode of the refrigerant circulation in 31 is changed. In this case, the increase in the refrigerant pressure in the refrigerant passage 32 is limited as compared with that before the abnormality in the air conditioning refrigerant circuit 31. More specifically, in order to suppress the pressure increase in which the refrigerant pressure in the refrigerant passage 32 exceeds a predetermined high-pressure upper limit value, the compressor 33 is driven in a drive-restricted state. As a result, even if an abnormality occurs in the air conditioning refrigerant circuit 31, the refrigerant can be circulated in a manner according to the occurrence of the abnormality. As a result, the battery can be properly cooled when an abnormality occurs in the air conditioning refrigerant circuit 31 while simplifying the configuration. Further, when the heat radiation fan 36 fails, it is possible to continuously cool the battery 51 while protecting the pipes and the like forming the refrigerant passage 32.

When the drive of the compressor 33 is restricted due to the failure of the heat dissipation fan 36, the air conditioning by the air conditioning refrigerant circuit 31 is restricted. In this case, for example, when both the air conditioning request and the battery cooling request are generated, the battery cooling request is prioritized. That is, in order to cool the battery 51, the refrigerant is circulated in the refrigerant passage 32. Thereby, the deterioration of the battery 51 due to the excessive rise in the battery temperature can be suitably suppressed.

When the drive limitation and the air conditioning limitation of the compressor 33 are performed due to the failure of the heat radiation fan 36, the air conditioning limitation is such that the refrigerant flows in the second circulation path L2 including the bypass passage 41 (the temperature adjustment unit 52). In addition, the refrigerant is restricted from flowing in the first circulation path L1 including the evaporator 35. In this case, battery cooling can be suitably performed while restricting air conditioning by suppressing vaporization of the refrigerant in the evaporator 35.

When the drive of the compressor 33 is restricted due to the failure of the heat dissipation fan 36, the restriction of air conditioning is released or the degree of restriction of air conditioning is decreased based on the vehicle speed being higher than a predetermined speed threshold THB. I decided to do it. When the vehicle speed is high, it is possible to perform the air conditioning in addition to the battery cooling, even in the situation where the driving of the compressor 33 is limited, by taking into consideration that the condenser 34 dissipates heat by the traveling wind. It will be possible. In this case, for example, it is possible to switch from a state in which the air conditioning is stopped to a state in which the air conditioning is performed as the air conditioning restriction.

Under the condition that the drive of the compressor 33 is restricted, the degree of the drive restriction of the compressor 33 is reduced based on the vehicle speed being higher than the speed threshold THA. When the vehicle speed is high, it is possible to reduce the degree of drive limitation of the compressor 33 and increase the degree of battery cooling by taking into consideration that heat is dissipated by the condenser 34 due to traveling wind.

Under the condition that the drive of the compressor 33 is restricted, the degree of the drive restriction of the compressor 33 is reduced based on the vehicle speed being higher than the speed threshold THA (first speed threshold) so that the vehicle speed is lower than the speed threshold THA. The degree of air conditioning restriction is reduced based on the fact that it is larger than the large speed threshold THB (second speed threshold). This makes it possible to reduce the degree of drive limitation of the compressor 33 and reduce the degree of air conditioning limitation according to the magnitude of the vehicle speed. In this case, when the vehicle speed increases, the degree of drive limitation of the compressor 33 is first reduced, and then the degree of air conditioning limitation is reduced. Therefore, when the heat radiation fan 36 fails, it is possible to appropriately perform air conditioning while giving priority to battery cooling.

When the radiation fan 36 fails, the cooling state of the refrigerant in the condenser 34 is different from that in the normal state of the radiation fan 36, and the driving state of the compressor 33 or the refrigerant when the compressor 33 is driven is different. Changes in pressure occur. In this case, based on the drive state of the compressor 33 or a control parameter indicating the refrigerant pressure when the compressor 33 is driven, the change in the refrigerant pressure after the occurrence of the stop failure of the heat radiation fan 36 is grasped to limit the drive of the compressor 33. The battery cooling can be appropriately performed according to the driving state of the compressor 33, and thus the magnitude of the refrigerant pressure, by adjusting the degree.

Note that the abnormality determination unit that determines whether or not there is an abnormality in the air conditioning refrigerant circuit 31 may use a configuration that determines that a heat radiation abnormality due to clogging in the condenser 34 (clogging abnormality) has occurred. This abnormality is, for example, a clogging of the condenser fin. For example, in step S11 of FIG. 3, the presence or absence of clogging abnormality in the condenser 34 is determined based on the refrigerant pressure on the upstream side of the condenser 34. In step S11 of FIG. 3, it is possible to perform both the determination that the heat dissipation fan 36 is stopped or the output is reduced, and the determination that the condenser 34 is clogged abnormally. Is. In this case, in a broad sense, it is sufficient to determine that the heat radiation in the condenser 34 is abnormal.

Another embodiment in which a part of the configuration of the first embodiment is changed will be described below. In the following description, the same components as those in the first embodiment are designated by the same reference numerals and the description thereof will be omitted.

(Second embodiment)
In the present embodiment, when it is determined that a failure has occurred in the heat radiating fan 36 as an abnormality in the air conditioning refrigerant circuit 31 under the condition that the battery cooling request is not generated, based on the vehicle traveling prediction after the present time, In the future, it will be predicted whether or not a situation in which a battery cooling request will occur will be predicted, and if it is predicted that a situation in which a battery cooling request will occur will be imposed, drive limitation of the compressor 33 will be implemented.

FIG. 7 is a flowchart showing a processing procedure of battery cooling in the present embodiment, and this processing is executed by replacing the processing of FIG. Note that, in FIG. 7, the same steps as those in FIG. 3 are given the same step numbers.

In FIG. 7, as a process different from that of FIG. 3, when the heat dissipation fan 36 fails and the battery cooling request is not issued (YES in step S11 and NO in step S13), the process proceeds to step S31. In step S31, it is predicted based on the vehicle traveling prediction after the present time whether or not a situation in which a battery cooling request occurs will occur. At this time, the control device 60 predicts whether or not a situation in which a battery cooling request occurs will be based on the traveling destination of the vehicle 10 registered in advance in the navigation device or the like. More specifically, the presence/absence of a battery cooling request in the future is predicted based on the traveling distance to the traveling destination, the required time, the road surface inclination on the traveling route, and the like. For example, it is predicted that the longer the travel distance to the travel destination, the longer the required time, and the more the road surface slope on the travel route is uphill, the higher the possibility that the battery cooling request will occur. In addition, the outside temperature and the weight of the vehicle 10 loaded may be taken into consideration.

Thereafter, in step S32, it is determined whether or not the prediction result of step S31 is a prediction result that a battery cooling request will occur. Then, if it is not the prediction result that the battery cooling request is generated, the process proceeds to step S14, and the compressor 33 is brought into the non-driving state.

If it is a predicted result that a battery cooling request will occur, the process proceeds to step S15, and the process of limiting the compressor rotation speed is performed based on the refrigerant pressure as described above. The processing after step S15 is as already described.

However, if it is predicted in step S31 that a battery cooling request will occur, it is better to increase the degree of drive restriction in the drive state of the compressor 33 than when the battery cooling request is currently occurring. Specifically, in the case where the drive restriction of the compressor 33 is implemented due to the affirmative determination in step S13, the step S16 is performed more than in the case where the drive restriction of the compressor 33 is implemented due to the affirmative determination in step S32. Alternatively, it is advisable to set the limit rotation speed set in step S19 to a small value.

As described above, according to the second embodiment, even if the battery cooling request is not generated at the time of the failure of the heat radiation fan 36, the battery cooling can be preliminarily performed based on the necessity of battery cooling after the present time. .. In this case, even if the heat generation amount of the battery sharply increases due to a sudden increase in the electric load or the like under the condition that the heat dissipation fan 36 is out of order, the increase in the battery temperature can be suppressed. That is, even when the cooling is insufficient and the temperature rises, it is possible to suppress the excessive rise of the battery temperature during traveling. As a result, the battery 51 can be protected.

Since it is predicted based on the traveling destination of the vehicle 10 whether or not a battery cooling request will occur, it is possible to appropriately cope with a rise in battery temperature due to a sudden change in traveling load.

When the drive limit of the compressor 33 is limited on the basis that it is predicted that a battery cooling request will occur, compared to the case where the drive limit of the compressor is limited based on the actual battery cooling request being generated, The degree of drive restriction in the drive state of is increased. In this case, battery cooling can be appropriately performed while suppressing excessive battery cooling and excessive air conditioning restriction.

(Other embodiments)
The above embodiment may be modified as follows, for example.

In the above embodiment, the drive of the compressor 33 is restricted when an abnormality occurs in the air conditioning refrigerant circuit 31, but this may be changed. For example, the control device 60 may control the expansion valve 38, and the expansion valve 38 may be controlled to limit an increase in the refrigerant pressure in the refrigerant passage 32. In this case, the amount of refrigerant passing through the expansion valve 38 is adjusted, and the refrigerant pressure is limited accordingly.

-As a restriction on air conditioning, it is possible to reduce the amount of refrigerant passing through the expansion valve 38 or to set the amount of refrigerant passing through the expansion valve 38 to zero. In this case, switching of the circulation paths L1 and L2 and adjustment of the amount of refrigerant passing through the expansion valve 38 may be performed as restrictions on air conditioning.

When the abnormality occurs in the air conditioning refrigerant circuit 31, the upper limit value of the refrigerant pressure in the normal time and the abnormality occurrence time is set as a configuration for limiting the increase in the refrigerant pressure in the refrigerant passage 32 compared to the normal time before the occurrence of the abnormality. Alternatively, the upper limit value of the compressor rotation speed corresponding to the upper limit value of the refrigerant pressure may be made different so that the upper limit value of the refrigerant pressure or the upper limit value of the compressor rotation speed when an abnormality occurs is smaller than the upper limit value at the normal time. For example, the upper limit value of the compressor rotation speed when an abnormality occurs is set to be smaller than the upper limit value of the compressor rotation speed when normal. With such a configuration, when an abnormality occurs in the air-conditioning refrigerant circuit 31, if the compressor rotation speed at that time is relatively low, it is not always necessary to immediately reduce the compressor rotation speed, and the rotation speed is lower than that in normal operation. When the rotation speed upper limit value is exceeded, the compressor rotation speed may be limited by the upper limit value.

When the air conditioning is limited, the distribution of the amount of the refrigerant flowing through the first circulation route L1 and the amount of the refrigerant flowing through the second circulation route L2 may be adjusted based on the battery temperature. Specifically, when a failure occurs in the heat radiation fan 36, the control device 60 flows through the second circulation path L2 and the amount of refrigerant flowing through the first circulation path L1 based on the relationship of FIG. The distribution with the amount of refrigerant (L2 refrigerant amount) is adjusted. In FIG. 8, the distribution ratio is adjusted so that the higher the battery temperature, the less the L2 refrigerant amount relative to the L1 refrigerant amount. It should be noted that this processing may be performed in step S17 of FIG. 3, for example.

-When an abnormality occurs in the air conditioning refrigerant circuit 31, the control mode of the refrigerant circulation in the air conditioning refrigerant circuit 31 may be changed by the following methods. Note that, here, a configuration will be described in which the drive of the compressor 33 is restricted when a failure of the heat radiation fan 36 occurs. Below, the time chart in a 1st method is shown in FIG. 9, and a flowchart is shown in FIG. Further, a time chart in the second method is shown in FIG. 11 and a flow chart is shown in FIG. FIG. 13 shows a time chart in the third method, and FIG. 14 shows a flow chart. 10, FIG. 12, and FIG. 14 are flowcharts showing the processing procedure of battery cooling, respectively, and any one of them is repeatedly executed by the control device 60 at a predetermined cycle. In each of these flowcharts, the process is omitted, but it is premised that a battery cooling request is made.

First, the first method will be explained. As shown in FIG. 9, when the heat dissipation fan 36 fails at timing t11, the refrigerant pressure rises, and at timing t12, the refrigerant pressure rises to the first threshold value TH1. As a result, after the timing t12, the compressor rotation speed is controlled at the limited rotation speed N1. As described above, the first threshold value TH1 is a pressure threshold value determined based on the high-pressure upper limit value within the range that suppresses high-pressure breakage of the refrigerant pipe or the valve opening pressure of the safety valve.

In the battery cooling process by the control device 60, in step S41 in FIG. 10, it is determined whether or not the heat dissipation fan 36 has a failure that causes a stop or an output reduction. If the heat dissipation fan 36 has not failed, the process proceeds to step S42, and the compressor 33 is normally driven.

If the heat dissipation fan 36 has a failure, the process proceeds to step S43, and it is determined whether the refrigerant pressure is equal to or higher than the first threshold value TH1. If the refrigerant pressure is equal to or higher than the first threshold value TH1, the process proceeds to step S44, and the compressor rotation speed is limited to the limited rotation speed N1. If the refrigerant pressure is less than the first threshold value TH1, the process proceeds to step S45 and the current drive state of the compressor 33 is maintained. That is, the target rotation speed of the compressor 33 is left as it is (that is, in the normal drive state or the drive limited state).

According to the first method described above, when the refrigerant pressure rises to the first threshold value TH1 at the time of failure of the heat dissipation fan 36, after that, drive limitation of the compressor 33 is implemented in a uniform manner.

Next, the second method will be explained. As shown in FIG. 11, when a failure of the heat radiation fan 36 occurs at timing t21, the refrigerant pressure rises, and at timing t22, the refrigerant pressure rises to the first threshold value TH1. As a result, at the timing t22, the compressor rotation speed is controlled at the limited rotation speed N1, and the refrigerant pressure starts decreasing. After that, at timing t23, when the refrigerant pressure decreases to the second threshold value TH2 which is lower than the first threshold value TH1, the limiting rotation speed of the compressor 33 is NA1 larger than N1 (that is, the rotation speed having a smaller limiting degree than N1). Will be updated.

After that, when the refrigerant pressure rises again and rises to the first threshold value TH1 at the timing t24, the compressor rotation speed is controlled at the limited rotation speed N1, and thereafter, the refrigerant pressure falls and drops to the second threshold value TH2 at the timing t25. Then, the limited rotation speed of the compressor 33 is updated to NA2 that is larger than N1 and smaller than NA1 (that is, the rotation speed that has a larger degree of limitation than when TH2 was reached last time). After that, the same processing is repeated as necessary.

In the battery cooling process by the control device 60, it is determined in step S51 in FIG. 12 whether or not the heat dissipation fan 36 has a failure that causes a stop or an output reduction. If the heat dissipation fan 36 has not failed, the process proceeds to step S52, and the compressor 33 is normally driven.

If the heat dissipation fan 36 has a failure, the process proceeds to step S53, and it is determined whether the refrigerant pressure is equal to or higher than the first threshold value TH1. If the refrigerant pressure is equal to or higher than the first threshold value TH1, the process proceeds to step S54, and the compressor rotation speed is limited to the limited rotation speed N1. If the refrigerant pressure is less than the first threshold TH1, the process proceeds to step S55, and it is determined whether the refrigerant pressure is the second threshold TH2 or more. Then, if the refrigerant pressure is equal to or higher than the second threshold value TH2, the process proceeds to step S56, and the current drive state of the compressor 33 is held.

If the refrigerant pressure is less than the second threshold value TH2, the process proceeds to step S57, and the limit rotation speed of the compressor 33 that is higher than the limit rotation speed N1 is set in order to reduce the degree of the drive limit of the compressor 33. According to this step S57, for example, at timings t23 and t25 in FIG. 11, NA1 and NA2 are set as the limiting rotation speeds, respectively. At this time, when the increase in the refrigerant pressure is repeated, the limiting rotation speed NAi is set according to the number of repetitions i, and the larger the number of repetitions i, the smaller the limiting rotation speed NAi compared to the previous value (that is, It is set to a value with a greater degree of restriction than the previous value).

According to the second method described above, when the failure of the heat radiation fan 36 occurs, the drive limitation of the compressor 33 is started on condition that the refrigerant pressure has risen to the first threshold value TH1. In this case, the limiting rotation speed of the compressor 33 is gradually updated to a small value (that is, a value having a large limiting degree) while suppressing the refrigerant pressure from exceeding the first threshold value TH1.

However, the limited rotation speed set in step S57 of FIG. 12 may be the same rotation speed each time (that is, the rotation speed of the same degree of limitation). Alternatively, in step S57, a configuration may be adopted in which a rotation speed that is not limited is set.

Next, the third method will be explained. As shown in FIG. 13, when a failure of the heat radiation fan 36 occurs at timing t31, the refrigerant pressure rises, and at timing t32, the refrigerant pressure rises to the first threshold value TH1. As a result, at the timing t32, the compressor rotation speed is controlled at the limited rotation speed N1, and the refrigerant pressure starts decreasing. After that, at timing t33, when the refrigerant pressure decreases to the second threshold value TH2 which is lower than the first threshold value TH1, the limit rotation speed of the compressor 33 is NB1 larger than N1 (that is, the rotation speed having a smaller limit degree than N1). Will be updated.

After timing t33, the change in increase in the refrigerant pressure is monitored at a predetermined time interval ΔT, and, for example, at timings t34 and t35, the limiting rotation speed of the compressor 33 is gradually updated to a large value (that is, a value with a small limiting degree). The time interval ΔT may be a constant time or a gradually decreasing time. The update width ΔNx for gradually increasing the limited rotation speed may be a constant value or a value that gradually decreases. Then, at timing t34, the speed limit is updated to a small value based on the refrigerant pressure rising to the first threshold value TH1. After that, the same processing is repeated.

In the battery cooling process by the control device 60, it is determined in step S61 in FIG. 14 whether or not the heat dissipation fan 36 has a failure that causes a stop or an output reduction. If no failure has occurred in the heat radiation fan 36, the process proceeds to step S62, and the compressor 33 is normally driven.

If the heat dissipation fan 36 has failed, the process proceeds to step S63, and it is determined whether the refrigerant pressure is equal to or higher than the first threshold value TH1. If the refrigerant pressure is equal to or higher than the first threshold value TH1, the process proceeds to step S64, and it is determined whether or not the refrigerant pressure becomes equal to or higher than the first threshold value TH1 for the first time after the failure of the heat radiation fan 36 occurs. .. If it is the first time, the process proceeds to step S65, and the compressor rotation speed is limited to the limited rotation speed N1 (timing t32 in FIG. 13). If it is not the first time, the limit rotation speed is reduced by a predetermined value in order to increase the degree of drive limitation of the compressor 33 from the previous value (timing t36 in FIG. 13).

If the refrigerant pressure is less than the first threshold TH1, the process proceeds to step S67, and it is determined whether the refrigerant pressure is the second threshold TH2 or more. Then, if the refrigerant pressure is equal to or higher than the second threshold value TH2, the process proceeds to step S68, and after the refrigerant pressure reaches the first threshold value TH1, a predetermined time has elapsed since the last time it was updated to the side in which the speed limit is increased. It is determined whether or not. When the result in step S68 is affirmative, the process proceeds to step S69, and the limit rotation speed is increased by a predetermined value (timings t34 and t35 in FIG. 13).

If either of steps S67 and S69 is denied, the process proceeds to step S70, and the current drive state of the compressor 33 is held.

According to the third method described above, when the failure of the heat radiation fan 36 occurs, the drive limitation of the compressor 33 is started on condition that the refrigerant pressure rises to the first threshold value TH1. In this case, the limiting rotation speed of the compressor 33 is gradually updated from the limiting rotation speed N1 having a large degree of limitation to a large value while suppressing the refrigerant pressure from exceeding the first threshold value TH1.

As the abnormality determination in the air conditioning refrigerant circuit 31, it may be configured to determine that the refrigerant leakage is occurring in the air conditioning refrigerant circuit 31. The processing procedure of battery cooling in this configuration will be described with reference to FIG. Here, when a refrigerant leak occurs as an abnormality in the air-conditioning refrigerant circuit 31, there is a concern that the battery may be insufficiently cooled due to a decrease in heat conversion capacity in the air-conditioning refrigerant circuit 31. As a change, the implementation of air conditioning is limited to compensate for the shortage of battery cooling.

In FIG. 15, in step S81, it is determined whether a refrigerant leak has occurred in the air conditioning refrigerant circuit 31 as an abnormality in the air conditioning refrigerant circuit 31. For example, based on the detection value of the refrigerant pressure sensor 37, the presence/absence of refrigerant leakage abnormality is determined. It is also possible to determine the presence/absence of a refrigerant leakage abnormality based on the detection value of the refrigerant pressure sensor 37 while taking into consideration the driving state of the compressor 33 such as the compressor rotation speed.

If no refrigerant leakage abnormality has occurred, step S81 is denied and the process proceeds to step S82 to drive the compressor 33 normally. At this time, the control device 60 executes the rotation speed control of the compressor 33 based on the air conditioning request and the battery cooling request.

If a refrigerant leakage abnormality has occurred, the affirmative decision is made in step S81 and the operation proceeds to step S83. In step S83, it is determined whether a battery cooling request has been issued. If the battery cooling request is not generated, the process proceeds to step S85, and the compressor 33 is brought into a non-driving state. At this time, if air conditioning is being performed in response to the air conditioning request at the time when the refrigerant leakage abnormality occurs, the air conditioning is stopped as the drive of the compressor 33 is stopped.

If a battery cooling request is made, the process proceeds to step S84 and it is determined whether the refrigerant pressure is equal to or higher than a predetermined threshold value TH11. The threshold value TH11 is, for example, a pressure lower limit value that allows the temperature control unit 52 to cool the battery. The threshold value TH11 may be determined based on the relationship between the refrigerant pressure and the heat exchange capacity of the temperature adjustment unit 52. Then, if the refrigerant pressure is less than the threshold value TH11 in step S84, the process proceeds to step S85, and the compressor 33 is brought into a non-driving state. That is, when the refrigerant pressure is excessively reduced, battery cooling becomes impossible, and the drive of the compressor 33 is stopped.

If the refrigerant pressure is equal to or higher than the threshold value TH11, the process proceeds to step S86. In step S86, the refrigerant pressure is maintained at a pressure equal to or higher than the predetermined pressure Pa by driving the compressor 33 in order to continue the battery cooling even in the situation where the refrigerant leakage abnormality occurs. That is, the control of the refrigerant pressure is performed at a level at which the heat conversion in the temperature adjustment unit 52 is possible. The predetermined pressure Pa is a pressure that enables at least the minimum battery cooling, and may be a pressure of “TH11+α” with the threshold TH11 as a reference, for example.

After that, in step S87, it is determined whether or not an air conditioning request is currently made. When step S87 is positive, the process proceeds to step S88. At this time, if both the air conditioning request and the battery cooling request are generated, step S87 is affirmed. If step S87 is denied, this process ends.

In step S88, it is determined whether or not the current situation is such that the air conditioning request and the battery cooling request are not satisfied even if the output of the compressor 33 is increased. Then, when step S88 is denied, that is, when both requests can be satisfied, the process proceeds to step S90 to activate the air conditioning. In step S90, in the air conditioning refrigerant circuit 31, the air conditioning is activated by setting the refrigerant to flow in the first circulation path L1 in addition to the second circulation path L2.

If step S88 is positive, the process proceeds to step S89. In step S89, it is determined whether the vehicle speed is equal to or higher than the speed threshold THC. If the result at step S89 is affirmative, the process proceeds to step S90 to activate the air conditioning.

If step S89 is denied, the process proceeds to step S91 to stop the air conditioning. At this time, in the air conditioning refrigerant circuit 31, the refrigerant is allowed to flow in the second circulation path L2, and the refrigerant is stopped from flowing in the first circulation path L1. This limits the implementation of air conditioning.

If the vehicle speed becomes equal to or higher than the speed threshold value THC under the condition that the air conditioning is stopped in step S91, that is, the step S88 is affirmative and the step S89 is negative, the step S89 is affirmative and the step S90 is affirmative. At, the air conditioning is activated (the restriction on the air conditioning is lifted). At this time, in step S90, the degree of air conditioning restriction may be reduced instead of canceling the air conditioning restriction.

The effects of this embodiment will be described below.

When a refrigerant leak occurs as an abnormality in the air conditioning refrigerant circuit 31, it is possible that the ability of heat conversion in the air conditioning refrigerant circuit 31 decreases, but by restricting the execution of air conditioning by the air conditioning refrigerant circuit 31. , The shortage of battery cooling can be compensated. As a result, the battery can be cooled in the most appropriate state when an abnormality occurs.

Under the situation where an air conditioning request and a battery cooling request are generated and it is determined that an abnormality is occurring in the air conditioning refrigerant circuit 31, even if the output of the compressor 33 is increased, the air conditioning request and the battery cooling request are not satisfied. Under the conditions, the implementation of air conditioning was restricted. In this case, by considering the situation in which the air conditioning request and the battery cooling request are generated and the compressor driving state, it is possible to implement the appropriate air conditioning restriction while continuing the battery cooling.

-Based on the vehicle speed being higher than the speed threshold THC, the air conditioning restriction is released or the degree of air conditioning restriction is reduced. Considering that when the vehicle speed is high, heat is dissipated from the condenser 34 by the traveling wind, it is possible to switch from a state in which the air conditioning is stopped to a state in which the air conditioning is performed as the air conditioning restriction.

-The following processing may be performed as a response when a refrigerant leakage abnormality occurs. When the air conditioning is restricted, the distribution of the amount of the refrigerant flowing through the first circulation path L1 and the amount of the refrigerant flowing through the second circulation path L2 may be adjusted based on the battery temperature. Specifically, when the refrigerant leakage abnormality occurs, the control device 60, based on the relationship of FIG. 8, the amount of the refrigerant flowing through the first circulation path L1 (L1 refrigerant quantity) and the refrigerant flowing through the second circulation path L2. The distribution with the amount (L2 refrigerant amount) is adjusted. Note that this process may be performed in step S91 of FIG. 15, for example.

-When a refrigerant leakage abnormality occurs, it may be configured to perform surplus air conditioning control, taking into account that both an air conditioning request and a battery cooling request will occur after the present time. FIG. 16 is a flowchart for explaining such processing. This process is performed by the control device 60 at a predetermined cycle.

In FIG. 16, in step S101, it is determined whether or not one or both of the air conditioning request and the battery cooling request are currently occurring, and in the following step S102, it is determined whether a refrigerant leakage abnormality has occurred. To judge. When both steps S101 and S102 are affirmed, the process proceeds to step S103. In step S103, it is predicted whether or not both the air-conditioning request and the battery cooling request will occur based on the vehicle traveling prediction after the present time. At this time, when the vehicle is traveling, it is possible to predict that both an air conditioning request and a battery cooling request will occur in the future due to changes in the outside air temperature after the present time and traveling conditions such as high speed traveling. It is also possible to predict that at the time of occurrence of the refrigerant leakage abnormality (abnormality of the air conditioning refrigerant circuit 31), both future air conditioning demand and battery cooling demand cannot be satisfied.

After that, in step S104, surplus air conditioning is performed with respect to the current request before both the air conditioning request and the battery cooling request occur. In this case, if the air conditioning has already been performed in response to the air conditioning request, the vehicle interior air conditioning (cooling) is made stronger than at the present time, for example, by lowering the set temperature of the air conditioning. If the air conditioning is not performed, the air conditioning (cooling) is started regardless of whether or not there is a current air conditioning request. It is also possible to estimate the future timing at which both the air conditioning request and the battery cooling request occur based on the vehicle travel prediction, and to start the surplus air conditioning at a timing that is a predetermined time back from the timing.

According to the above configuration, before the air conditioning request and the battery cooling request both occur, the excess air conditioning (excess air conditioning) for the current request is performed to improve the vehicle interior environment. You can

It is also possible to use other than the refrigerant pressure in the refrigerant passage 32 as the “control parameter”. For example, since the driving state of the compressor 33 changes depending on the energizing current of the compressor 33, the compressor energizing current may be acquired as a control parameter. In this case, for example, based on the compressor energization current detected by the current sensor 65, it is determined that the refrigerant pressure is rising after the stop failure of the heat radiation fan 36, and the compressor 33 is driven based on the determination result. Adjust the degree of restriction. In addition, the configuration may be such that the compressor torque or the compressor output is acquired as the control parameter.

The electric compressor 33 has a structure in which the driving state is controlled by changing the rotation speed, and the driving state is controlled by changing the refrigerant discharge amount per one rotation. It may be configured.

As the compressor of the air conditioning refrigerant circuit 31, a mechanical compressor driven by the power of the engine 11 may be used instead of the electric compressor 33. In this configuration, the rotating shaft of the compressor is connected to the output shaft of the engine 11 via a connecting member such as a belt, and the compressor is driven as the engine 11 rotates. In this case, for example, a multistage or continuously variable transmission is provided in the rotation input section of the compressor, and the rotational speed of the compressor can be controlled by controlling the transmission. Then, under the situation where the battery cooling request is generated and it is determined that the abnormality has occurred in the air conditioning refrigerant circuit 31, it is preferable to drive the compressor in a drive limited state (a state in which the rotation speed is limited).

The on-vehicle electric equipment supplied with power from the battery 51 may be other than the rotating electric machine 21, and may be, for example, a heater for heating the interior of the vehicle, a heater for heating an exhaust purification catalyst, or various auxiliary equipment such as an electric pump. May be

The vehicle applicable in the present disclosure may be other than a hybrid vehicle, and may be, for example, a vehicle including an internal combustion engine as a traveling power source, an electric vehicle including a rotating electric machine as a traveling power source, or a fuel cell vehicle. Good.

The control unit and the method thereof described in the present disclosure are realized by a dedicated computer provided by configuring a processor and a memory programmed to execute one or more functions embodied by a computer program. May be done. Alternatively, the control unit and the method thereof described in the present disclosure may be realized by a dedicated computer provided by configuring a processor with one or more dedicated hardware logic circuits. Alternatively, the control unit and the method thereof described in the present disclosure are based on a combination of a processor and a memory programmed to execute one or a plurality of functions and a processor configured by one or more hardware logic circuits. It may be implemented by one or more dedicated computers configured. Further, the computer program may be stored in a computer-readable non-transition tangible recording medium as an instruction executed by a computer.

Although the present disclosure has been described according to the embodiments, it is understood that the present disclosure is not limited to the embodiments and the structure. The present disclosure also includes various modifications and modifications within an equivalent range. In addition, various combinations and forms, and other combinations and forms including only one element, more, or less than those, also fall within the scope and spirit of the present disclosure.

Claims

An air conditioning refrigerant circuit (31) including a refrigerant passage (32) for circulating a refrigerant, a compressor (33) for compressing the refrigerant, a heat source side heat exchanger (34), and a utilization side heat exchanger (35). ,
A battery (51) for supplying electric power to an in-vehicle electric device (21);
A battery cooling unit (52) for cooling the battery by circulating the refrigerant in the refrigerant passage;
A controller (60) which is applied to an in-vehicle cooling system including: and controls a driving state of the compressor based on an air conditioning request and a battery cooling request,
An abnormality determination unit that determines that an abnormality has occurred in the air conditioning refrigerant circuit,
Under the situation where the battery cooling request is generated and it is determined that the abnormality is occurring, the control mode of the refrigerant circulation in the air conditioning refrigerant circuit is changed while continuing the cooling of the battery by the battery cooling unit. A control mode changing unit for
A control device for an in-vehicle cooling system including the.
The control device for the vehicle-mounted cooling system according to claim 1, wherein the control mode changing unit limits the increase in the refrigerant pressure in the refrigerant passage as compared with the time before the abnormality occurs, as the control mode is changed.
The control mode changing unit limits the increase of the refrigerant pressure in the refrigerant passage as the change of the control mode, and the refrigerant pressure in the refrigerant passage suppresses the pressure increase exceeding a predetermined high pressure upper limit value. The control device for a vehicle-mounted cooling system according to claim 1 or 2, which limits driving of the compressor.
The vehicle-mounted cooling system according to claim 2 or 3, further comprising an air-conditioning restriction unit that restricts execution of air conditioning by the air-conditioning refrigerant circuit when the increase in the refrigerant pressure in the refrigerant passage is restricted as a change of the control mode. Control device.
The refrigerant passage has a bypass passage (41) that is provided in parallel with the usage-side heat exchanger and supplies the refrigerant to the battery cooling unit, and a first circulation including the usage-side heat exchanger. It is possible to switch which circulation path of the path (L1) and the second circulation path (L2) that does not include the use-side heat exchanger and includes the bypass path, in which the refrigerant flows.
The in-vehicle cooling system according to claim 4, wherein the air-conditioning restriction unit sets the refrigerant to flow in the second circulation path and restricts the refrigerant to flow in the first circulation path as the air-conditioning restriction. Control device.
The air conditioning restriction unit distributes the amount of the refrigerant flowing through the first circulation path and the amount of the refrigerant flowing through the second circulation path based on the temperature of the battery when the air conditioning is restricted. The controller of the vehicle-mounted cooling system according to claim 5, which is adjusted.
7. The air conditioning restriction unit releases the restriction of the air conditioning or reduces the degree of the restriction of the air conditioning based on the vehicle speed, which is the traveling speed of the vehicle, being higher than a predetermined speed threshold value. The control device for a vehicle-mounted cooling system according to claim 1.
The control mode changing unit is configured to change the control mode such that the vehicle speed, which is the traveling speed of the vehicle, is higher than a predetermined first speed threshold value under the condition that the increase of the refrigerant pressure in the refrigerant passage is limited. Based on, the degree of restriction of the refrigerant pressure is reduced,
7. The air conditioning restriction unit reduces the degree of restriction of the air conditioning based on that the vehicle speed is higher than a second speed threshold value that is higher than the first speed threshold value, according to claim 4. Control device for in-vehicle cooling system.
The control mode changing unit is based on that the vehicle speed, which is the traveling speed of the vehicle, is greater than a predetermined speed threshold value under the condition that the increase of the refrigerant pressure in the refrigerant passage is limited as the change of the control mode. The control device for a vehicle-mounted cooling system according to any one of claims 1 to 8, wherein the degree of restriction of the refrigerant pressure is reduced.
When it is determined that the abnormality has occurred in a situation in which the battery cooling request has not occurred, it is predicted whether or not the situation in which the battery cooling request will occur occurs based on the vehicle traveling prediction after the present time. Equipped with a predictor,
The vehicle-mounted cooling system according to claim 1, wherein the control mode changing unit changes the control mode when the prediction unit predicts that the battery cooling request will be generated. Control device.
The electric device is a rotating electric machine (21) serving as a power source for running the vehicle,
The controller of the vehicle-mounted cooling system according to claim 10, wherein the prediction unit predicts whether or not the battery cooling request will be generated based on a traveling destination of the vehicle.
The control mode changing unit,
As a change of the control mode, it is intended to limit the increase of the refrigerant pressure in the refrigerant passage,
In the case of limiting the refrigerant pressure based on the fact that the battery cooling request is predicted to occur, compared to the case of limiting the refrigerant pressure based on the fact that the battery cooling request is actually generated, The control device for a vehicle-mounted cooling system according to claim 10, wherein the degree of restriction of the refrigerant pressure is increased.
The control device for a vehicle-mounted cooling system according to claim 1, wherein the control mode changing unit includes an air conditioning restriction unit that restricts execution of air conditioning by the air conditioning refrigerant circuit as a change of the control mode.
In the situation where the air conditioning request and the battery cooling request are generated and it is determined that the abnormality is occurring, the air conditioning restriction unit is configured to increase the output of the compressor, and the air conditioning request and the battery cooling are performed. The control device for a vehicle-mounted cooling system according to claim 13, wherein execution of the air conditioning is restricted on condition that the requirement is not satisfied.
In a situation where one or both of the air conditioning request and the battery cooling request have not occurred, when it is determined that the abnormality has occurred, the air conditioning request and the battery cooling are performed based on the vehicle traveling prediction after the present time. A prediction unit that predicts whether or not both of the requests will occur,
The control mode changing unit, when the prediction unit predicts that both the air conditioning request and the battery cooling request will occur, before the air conditioning request and the battery cooling request both occur, the current request The control device for a vehicle-mounted cooling system according to claim 14, wherein the air-conditioning that is redundant with respect to the above is performed.
The refrigerant passage has a bypass passage (41) that is provided in parallel with the usage-side heat exchanger and supplies the refrigerant to the battery cooling unit, and a first circulation including the usage-side heat exchanger. It is possible to switch which circulation path of the path (L1) and the second circulation path (L2) that does not include the use-side heat exchanger and includes the bypass path, in which the refrigerant flows.
16. The air conditioning restriction unit sets, as the restriction of the air conditioning, a state in which the refrigerant flows through the second circulation path, and restricts the refrigerant through the first circulation path. The control device for the vehicle-mounted cooling system according to item 1.
The air conditioning restriction unit distributes the amount of the refrigerant flowing through the first circulation path and the amount of the refrigerant flowing through the second circulation path based on the temperature of the battery when the air conditioning is restricted. The controller of the vehicle-mounted cooling system according to claim 16, which is adjusted.
18. The air conditioning restriction unit releases the restriction of the air conditioning or reduces the degree of the restriction of the air conditioning based on the vehicle speed, which is the traveling speed of the vehicle, being higher than a predetermined speed threshold. The control device for a vehicle-mounted cooling system according to claim 1.
The driving state of the compressor, or a parameter acquisition unit for acquiring the refrigerant pressure in the refrigerant passage as a control parameter,
The control device for a vehicle-mounted cooling system according to claim 1, wherein the control mode changing unit changes the control mode based on the control parameter after the occurrence of the abnormality.
The abnormality determination unit is an abnormality in which the heat radiation fan (36) that blows air to the heat source side heat exchanger in the air conditioning refrigerant circuit is stopped or the output is reduced, heat radiation abnormality due to clogging in the heat source side heat exchanger, The vehicle-mounted cooling according to any one of claims 1 to 19, wherein it is determined that an abnormality has occurred in the air conditioning refrigerant circuit based on at least one of the refrigerant leakage abnormalities in the air conditioning refrigerant circuit. The control unit of the system.
The air-conditioning refrigerant circuit,
The battery;
The battery cooling unit,
An in-vehicle cooling system comprising: the control device according to any one of claims 1 to 20.