Vehicle Thermal Equilibrium Cooling System Control Method and Device

Abstract

The present application provides a control method and device for a vehicle thermal balance cooling system. The method includes: detecting whether an air-conditioning refrigeration request and a battery refrigeration request are received, where the air-conditioning refrigeration request carries a first compressor speed and the battery refrigeration request carries a second compressor speed; when the air-conditioning refrigeration request and the battery refrigeration request are received, determining the opening information of the first switching valve and the opening information of the second switching valve according to the ratio of the first compressor speed to the second compressor speed and the charge and discharge state of the vehicle; and controlling the opening of the first switching valve and the opening of the second switching valve based on the opening information of the first switching valve and the opening information of the second switching valve. This method can intelligently allocate the refrigeration capacity for the air-conditioning cooling circuit and the battery cooling circuit.

Description

Technical Field

[0001] The present application relates to the technical field of vehicles, and particularly relates to a control method and device for a vehicle thermal balance cooling system. Background Art

[0002] New energy vehicles are vehicles that use unconventional vehicle fuels as the power source. Hybrid electric vehicles, pure electric vehicles, fuel cell vehicles, etc. all belong to common new energy vehicles. Compared with traditional fuel vehicles, new energy vehicles inevitably face the risk of thermal runaway and spontaneous combustion of the vehicle.

[0003] To avoid thermal runaway of components such as the battery, a battery cooling system is generally provided in new energy vehicles, and the battery cooling system shares some cooling components with the air-conditioning cooling system.

[0004] When the air-conditioning refrigeration demand and the battery cooling demand exist simultaneously, the distribution of the refrigeration capacity between the air-conditioning and the battery is a design difficulty of current vehicles. Summary of the Invention

[0005] In view of this, the present application provides a control method and device for a vehicle thermal balance cooling system.

[0006] Specifically, the following technical solutions are included:

[0007] In a first aspect, a control method for a vehicle thermal balance cooling system is provided. The system includes an air-conditioning cooling circuit and a battery cooling circuit. The air-conditioning cooling circuit includes a first branch and a second branch connected in parallel. The first branch includes a first switching valve and an evaporator connected in series. The second branch includes a second switching valve and a first heat exchange pipeline of a heat exchanger. The battery cooling circuit includes a battery and a second heat exchange pipeline of the heat exchanger. The first heat exchange pipeline and the second heat exchange pipeline are adjacent to each other for heat transfer;

[0008] The method includes:

[0009] Detect whether an air-conditioning refrigeration request and a battery refrigeration request are received. The air-conditioning refrigeration request carries a first compressor speed, and the battery refrigeration request carries a second compressor speed;

[0010] When the air-conditioning refrigeration request and the battery refrigeration request are received, determine the opening information of the first switching valve and the opening information of the second switching valve according to the ratio of the first compressor speed to the second compressor speed and the charge and discharge state of the vehicle;

[0011] Based on the opening information of the first switching valve and the opening information of the second switching valve, control the opening of the first switching valve and the opening of the second switching valve.

[0012] Optionally, determining the opening information of the first switching valve and the opening information of the second switching valve according to the ratio of the first compressor speed to the second compressor speed and the charge and discharge state of the vehicle includes:

[0013] Determine the charge and discharge state of the vehicle, where the charge and discharge state includes a fast charge state, a slow charge state, and a discharge state;

[0014] When the vehicle is in the fast charge state, determine the opening information of the first switching valve and the opening information of the second switching valve based on the ratio of the first compressor speed to the second compressor speed;

[0015] When the vehicle is in the slow charge state or the discharge state, determine the opening information of the second switching valve based on the ratio of the first compressor speed to the second compressor speed, and set the opening information of the first switching valve to fully open.

[0016] Optionally, when only the air-conditioning cooling request is received, determine that the opening information of the first switching valve is fully open and the opening information of the second switching valve is fully closed;

[0017] When only the battery cooling request is received, determine that the opening information of the first switching valve is fully closed and the opening information of the second switching valve is fully open.

[0018] Optionally, the air-conditioning cooling circuit further includes a compressor, and the method further includes:

[0019] When the battery cooling request is received, perform proportional-integral-derivative (PID) control on the speed of the compressor based on the target temperature of the inlet and outlet water of the battery;

[0020] When the battery cooling request is not received but the air-conditioning cooling request is received, control the speed of the compressor according to the first compressor speed in the air-conditioning cooling request.

[0021] Optionally, when the battery cooling request is received, the method further includes:

[0022] Determine the charge and discharge state of the vehicle, and determine the target temperature of the inlet and outlet water of the battery according to the charge and discharge state of the vehicle.

[0023] Optionally, the system further includes a cooling fan and a motor drive circuit. The motor drive circuit includes a motor, a charger, a DC converter, and an inverter connected in series. The air-conditioning cooling circuit further includes a condenser and a first expansion valve. The condenser is connected to the first expansion valve through a refrigerant pipeline;

[0024] The method further includes:

[0025] When receiving the air conditioner cooling request or the battery cooling request, determine the first fan speed of the cooling fan based on the pressure of the refrigerant pipeline;

[0026] Determine whether the temperature of any one of the motor, the inverter, the DC converter, and the charger exceeds the temperature threshold corresponding to the any one of the components;

[0027] When there is a temperature of any one of the components exceeding the temperature threshold corresponding to the any one of the components, determine the second fan speed of the cooling fan according to the temperature of the any one of the components, and use the larger value of the first fan speed and the second fan speed as the target fan speed of the cooling fan;

[0028] When there is no temperature of any one of the components exceeding the temperature threshold corresponding to the any one of the components, use the first fan speed as the target fan speed of the cooling fan;

[0029] Control the cooling fan to operate at the target fan speed.

[0030] Optionally, the method further includes:

[0031] When receiving an over-temperature fault signal sent by any one of the motor, the inverter, the DC converter, and the charger, control the cooling fan to operate at a third fan speed.

[0032] Optionally, the system further includes a motor drive circuit, and the motor drive circuit includes a motor, a motor cooling water pump, an inverter, a charger, and a DC converter connected in series;

[0033] The method further includes any one of the following:

[0034] When detecting that the whole vehicle is in a ready-to-start state, control the motor cooling water pump to operate at a first motor water pump speed;

[0035] Determine whether the temperature of any one of the motor, the inverter, the DC converter, and the charger exceeds the temperature threshold corresponding to the any one of the components. When it exceeds, determine the second motor water pump speed of the motor cooling water pump according to the temperature of the any one of the components, and control the motor cooling water pump to operate at the second motor water pump speed;

[0036] When detecting a cooling request for the charger or the DC converter, control the motor cooling water pump to operate at a third motor water pump speed;

[0037] When receiving an over-temperature fault signal sent by any one of the motor, the inverter, the DC converter, and the charger, control the motor cooling water pump to operate at the maximum motor water pump speed.

[0038] Optionally, the battery cooling circuit further includes a battery cooling water pump, and the method further includes any one of the following:

[0039] When receiving a battery temperature equalization request, determine a first battery water pump speed of the battery cooling water pump according to the temperature information in the battery temperature equalization request, and control the battery cooling water pump to operate at the first battery water pump speed, where the battery temperature equalization request is generated when the temperatures at the battery inlet and outlet exceed a first threshold;

[0040] When receiving the battery refrigeration request, control the battery cooling water pump to operate at a second battery water pump speed, where the battery refrigeration request is generated when the temperature of any battery cell in the battery module is higher than a second threshold.

[0041] On the other hand, a control device for a vehicle thermal balance cooling system is provided. The system includes an air-conditioning cooling circuit and a battery cooling circuit. The air-conditioning cooling circuit includes a first branch and a second branch connected in parallel. The first branch includes a first switching valve and an evaporator connected in series. The second branch includes a second switching valve and a first heat exchange pipeline of a heat exchanger. The battery cooling circuit includes a battery and a second heat exchange pipeline of the heat exchanger. The first heat exchange pipeline and the second heat exchange pipeline are adjacent to perform heat transfer;

[0042] The device includes:

[0043] A detection module, configured to detect whether an air-conditioning refrigeration request and a battery refrigeration request are received. The air-conditioning refrigeration request carries a first compressor speed, and the battery refrigeration request carries a second compressor speed;

[0044] A determination module, configured to, when receiving the air-conditioning refrigeration request and the battery refrigeration request, determine opening information of the first switching valve and opening information of the second switching valve according to a ratio of the first compressor speed to the second compressor speed and a charge-discharge state of the vehicle;

[0045] A control module, configured to control the opening of the first switching valve and the opening of the second switching valve based on the opening information of the first switching valve and the opening information of the second switching valve.

[0046] The embodiment of the present application provides a control method and device for a vehicle thermal balance cooling system. In this method, when receiving two refrigeration requests, namely an air-conditioning refrigeration request and a battery refrigeration request, the opening information of a first switching valve and a second switching valve can be determined according to the ratio of the rotational speed of a first compressor carried in the air-conditioning refrigeration request to the rotational speed of a second compressor carried in the battery refrigeration request, and the current charge and discharge state of the vehicle. The first switching valve is located in the air-conditioning cooling circuit, and the second switching valve is located in the battery cooling circuit. Therefore, the present application can intelligently allocate the refrigeration capacity based on the refrigeration requirements of the vehicle occupant compartment, the refrigeration requirements of the battery, and the current charge and discharge state of the vehicle, and can effectively meet the refrigeration requirements of the battery while taking into account the refrigeration requirements of the occupant compartment. BRIEF DESCRIPTION OF THE DRAWINGS

[0047] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the following will briefly introduce the drawings required for the description of the embodiments. Obviously, the drawings in the following description are only some embodiments of the present application. For those of ordinary skill in the art, other drawings can be obtained based on these drawings without creative efforts.

[0048] Figure 1 It is a system framework diagram of the vehicle thermal balance cooling system provided by the embodiment of the present application;

[0049] Figure 2 It is a flowchart of a control method for a vehicle thermal balance cooling system provided by the embodiment of the present application;

[0050] Figure 3 It is a flowchart of another control method for a vehicle thermal balance cooling system provided by the embodiment of the present application;

[0051] Figure 4 It is a flowchart of yet another control method for a vehicle thermal balance cooling system provided by the embodiment of the present application;

[0052] Figure 5 It is a flowchart of still another control method for a vehicle thermal balance cooling system provided by the embodiment of the present application;

[0053] Figure 6 It is a signal transmission logic diagram of a vehicle thermal balance cooling system provided by the embodiment of the present application;

[0054] Figure 7 It is a schematic diagram of a control device for a vehicle thermal balance cooling system provided by the embodiment of the present application.

[0055] Among them, the reference numerals involved in the drawings include:

[0056] 100 - Controller, 101 - Compressor, 102 - Condenser, 103 - First Expansion Valve, 104 - First On - Off Valve, 105 - Evaporator, 106 - Second Expansion Valve, 107 - Second On - Off Valve, 108 - Heat Exchanger, 109 - Battery Cooling Water Pump, 110 - Battery, 111 - Radiator, 112 - Motor Cooling Water Pump, 113 - Charger, 114 - DC Converter, 115 - Inverter, 116 - Motor Controller, 117 - First Expansion Water Tank, 118 - Second Expansion Water Tank, 119 - Cooling Fan, 120 - Motor.

[0057] Through the above - mentioned drawings, specific embodiments of the present application have been shown, and more detailed descriptions will be given hereinafter. These drawings and textual descriptions are not intended to limit the scope of the concept of the present application in any way, but to illustrate the concept of the present application to those skilled in the art by referring to specific embodiments. Detailed Embodiments

[0058] Next, the technical solutions in the embodiments of the present application will be clearly and completely described in conjunction with the drawings in the embodiments of the present application. Obviously, the described embodiments are part of the embodiments of the present application, rather than all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the scope of protection of the present application.

[0059] Unless otherwise defined, all technical terms used in the embodiments of the present application have the same meaning as commonly understood by those of ordinary skill in the art. Some technical terms that appear in the embodiments of the present application are described below.

[0060] To make the technical solutions and advantages of the present application clearer, the following will further describe the embodiments of the present application in detail in conjunction with the drawings.

[0061] In a first aspect, an embodiment of the present application provides a control method for a vehicle thermal balance cooling system.

[0062] To make the solution of the present application easier to understand, hereby in conjunction with Figure 1 , the vehicle thermal balance cooling system involved in the present application is introduced. The vehicle thermal balance cooling system in the embodiments of the present application includes an air - conditioning cooling circuit and a battery cooling circuit. Refer to Figure 1, the air-conditioning cooling circuit may include a first branch and a second branch connected in parallel. The first branch includes a first switching valve 104 and an evaporator 105 connected in series. The second branch includes a second switching valve 107 and a first heat exchange pipeline of a heat exchanger 108. The battery cooling circuit includes a battery 110 and a second heat exchange pipeline of the heat exchanger 108. The first heat exchange pipeline and the second heat exchange pipeline are adjacent to each other for heat transfer. In some embodiments, the air-conditioning cooling circuit may further include a compressor 101, a condenser 102, and a first expansion valve 103 connected in series. The second branch may further include a second expansion valve 106. The battery cooling circuit may further include a battery cooling water pump 109.

[0063] Based on the above vehicle thermal balance cooling system, referring to Figure 2 , the control method provided by the embodiment of the present application includes steps 201-203.

[0064] Step 201, detect whether an air-conditioning refrigeration request and a battery refrigeration request are received. The air-conditioning refrigeration request carries a first compressor speed, and the battery refrigeration request carries a second compressor speed.

[0065] It should be noted that the control method provided by the embodiment of the present application may be executed by a vehicle controller, or by multiple controllers cooperating with each other. The following only takes the vehicle controller as the execution subject of the method as an example for description.

[0066] In step 201, the vehicle controller may detect whether an air-conditioning refrigeration request and a battery refrigeration request are received. The air-conditioning refrigeration request and the battery refrigeration request may be sent to the vehicle controller simultaneously, or sent to the vehicle controller after an interval of time. The vehicle controller may detect whether two refrigeration requests are received. When it is determined that two refrigeration requests are received, step 202 is executed.

[0067] The air-conditioning refrigeration request here may be generated and sent by an air-conditioning controller based on the state information of each component in the air-conditioning cooling circuit. The battery refrigeration request may be generated and sent by a battery management system (Battery Management System, abbreviated as BMS) based on the state information of each component in the battery cooling circuit. In another embodiment, each component in the air-conditioning cooling circuit and the battery cooling circuit may also be directly connected to the vehicle controller through a CAN network or a hard wire, and the vehicle controller uniformly monitors, makes logical judgments, and controls each component.

[0068] Step 202, when an air-conditioning refrigeration request and a battery refrigeration request are received, determine the opening information of the first switching valve 104 and the opening information of the second switching valve 107 according to the ratio of the first compressor speed to the second compressor speed and the charge and discharge state of the vehicle.

[0069] When the air conditioner controller detects the presence of an air conditioner cooling demand, it can generate a corresponding air conditioner cooling request and carry the first compressor speed in the air conditioner cooling request. Among them, the first compressor speed can be calculated by the air conditioner controller based on information such as the temperature difference between the inside and outside of the passenger compartment, the ambient temperature, the target temperature set by the occupant, and the temperature of the evaporator 105, or obtained by looking up a table.

[0070] When the battery management system detects the presence of a battery cooling demand, it can generate a corresponding battery cooling request and carry the second compressor speed in the battery cooling request. Among them, the second compressor speed can be calculated based on the actual inlet and outlet temperatures of the battery 110 and the set target temperature, etc. The set target temperature can be a temperature value or a temperature range when the battery 110 operates stably.

[0071] When the vehicle controller receives the two cooling requests, it can determine the opening information of the first switching valve 104 and the second switching valve 107 based on the ratio of the compressor speeds carried in the two cooling requests and the charge and discharge state of the vehicle. The compressor speeds carried in the two cooling requests can actually represent the magnitudes of the cooling capacities requested by the two cooling requests. Therefore, by means of the ratio of the compressor speeds in the two requests, the magnitude relationship of the cooling capacity demands of the two requests can be reflected. On this basis, combined with the charge and discharge state of the vehicle, the cooling capacity distribution can simultaneously meet the cooling demand of the passenger compartment and the cooling demand of the battery 110 under different vehicle states, making the cooling capacity distribution more reasonable and intelligent.

[0072] Step 203, based on the opening information of the first switching valve 104 and the opening information of the second switching valve 107, control the opening of the first switching valve 104 and the opening of the second switching valve 107.

[0073] After determining the opening information of the first switching valve 104 and the opening information of the second switching valve 107, the vehicle controller can control the opening of the first switching valve 104 and the opening of the second switching valve 107 to achieve the distribution of the cooling capacity.

[0074] In summary, in the vehicle thermal balance cooling system control method provided by the embodiments of the present application, when receiving the two cooling requests of the air conditioner cooling request and the battery cooling request, the opening information of the first switching valve and the second switching valve can be determined according to the ratio of the first compressor speed carried in the air conditioner cooling request and the second compressor speed carried in the battery cooling request, and the charge and discharge state of the vehicle at present. Among them, the first switching valve is located in the air conditioner cooling circuit, and the second switching valve is located in the battery cooling circuit. Therefore, the present application can realize the intelligent distribution of the cooling capacity based on the cooling demand of the vehicle passenger compartment, the cooling demand of the battery, and the current charge and discharge state of the vehicle, and can effectively meet the cooling demand of the battery on the basis of taking into account the cooling demand of the passenger compartment.

[0075] In another embodiment, referring to Figure 3 , a flowchart of another method for controlling a vehicle thermal balance cooling system is provided, and this method can be executed by a vehicle controller. This method may include:

[0076] Step 300, start.

[0077] Step 3011, determine whether a battery refrigeration request is received; if so, execute Step 3012, if not, execute Step 3013.

[0078] Step 3012, determine whether an air-conditioning refrigeration request is received; if so, execute Step 302, if not, execute Step 3033.

[0079] Step 3013, determine whether an air-conditioning refrigeration request is received; if so, execute Step 3034, if not, execute Step 3035.

[0080] Steps 3011-3013 are the processes for the vehicle controller to determine whether a battery refrigeration request and an air-conditioning refrigeration request are received. In this process, the vehicle controller can first determine whether a battery refrigeration request is received, and then determine whether an air-conditioning refrigeration request is received. In another embodiment, the vehicle controller can also first determine whether an air-conditioning refrigeration request is received, and then determine whether a battery refrigeration request is received. Under different judgment results, the vehicle controller executes different steps.

[0081] Step 302, determine the charge-discharge state of the vehicle, and the charge-discharge state includes a fast-charging state, a slow-charging state, and a discharging state; when the vehicle is in the fast-charging state, execute Step 3031, and when the vehicle is in the slow-charging or discharging state, execute Step 3032.

[0082] When the vehicle controller determines that a battery refrigeration request and an air-conditioning refrigeration request are received, it determines that there are currently two different types of refrigeration requirements, and at this time, it determines the charge-discharge state of the current vehicle. Under different charge-discharge states, the magnitude of the battery refrigeration requirement is different. When the vehicle is in the fast-charging state, since it is necessary to ensure a short charging time, it is necessary to ensure the rapid dissipation of the heat caused by fast charging. Therefore, the battery refrigeration requirement is greater during fast charging, and the battery temperature control needs to be more strict. At this time, execute Step 3031. When the vehicle is in the slow-charging state or the discharging state, the battery temperature rises slowly, so the battery refrigeration requirement is smaller than that in the fast-charging state. At this time, execute Step 3032.

[0083] Step 3031, when the vehicle is in the fast-charging state, based on the ratio of the first compressor speed to the second compressor speed, determine the opening information of the first switching valve 104 and the opening information of the second switching valve 107.

[0084] When the vehicle is in the fast charging state, the vehicle controller determines the opening information of the first switching valve 104 and the opening information of the second switching valve 107 based on the ratio of the first compressor speed to the second compressor speed. Exemplarily, when the ratio of the first compressor speed to the second compressor speed is x / y, the opening of the first switching valve 104 and the opening of the second switching valve 107 can also be set to x / y, and at the same time, the sum of the opening of the first switching valve 104 and the opening of the second switching valve 107 is set to 100% to calculate the opening of the first switching valve 104 and the opening of the second switching valve 107.

[0085] In the above embodiment, both the first switching valve 104 and the second switching valve 107 can be electronic proportional valves, and the respective openings of the two electronic proportional valves can be calculated according to the compressor speed ratio.

[0086] In another embodiment, the first switching valve 104 can be a shut-off valve, that is, a control valve with only two states of open and closed, and the second switching valve 107 can be an electronic proportional valve, which can have different degrees of opening within the range of 0-100%. In this case, after determining the ratio of the first compressor speed to the second compressor speed, the opening corresponding to this ratio can be found from the pre-set correspondence table between the ratio and the opening of the electronic proportional valve. This correspondence table can be obtained by the technical personnel through in-vehicle calibration; obtain the compressor speed ratio threshold corresponding to the shut-off valve, and determine the magnitude relationship between the ratio of the first compressor speed to the second compressor speed and the compressor speed ratio threshold. When it is greater than, determine that the opening information of the shut-off valve is open, and when it is less than or equal to, determine that the opening information of the shut-off valve is closed. The compressor speed ratio threshold corresponding to the shut-off valve can be pre-set, for example, it can be 1. This compressor speed ratio threshold can adjust the priority of the two refrigeration requests. For example, if the compressor speed ratio threshold is relatively large, the air-conditioning cooling circuit will only be opened when the air-conditioning refrigeration demand is significantly greater than the battery refrigeration demand, and thus the battery refrigeration demand can be preferentially satisfied.

[0087] In some embodiments, when the first switching valve 104 is a shut-off valve, when the vehicle controller detects that the temperature of the battery 110 is higher than the preset temperature threshold, the shut-off valve is directly closed. Here, the temperature threshold corresponds to the temperature when the battery 110 has an overheat failure. By directly closing the shut-off valve when it is detected that the temperature of the battery 110 is higher than the preset temperature threshold, all the refrigeration capacity can be allocated to the battery cooling circuit in time when the battery 110 may have an overheat failure, so as to avoid battery thermal runaway.

[0088] Step 3032, when the vehicle is in the slow charging state or the discharging state, based on the ratio of the first compressor speed to the second compressor speed, determine the opening information of the second switching valve 107, and set the opening information of the first switching valve 104 to be fully open.

[0089] When the vehicle is in the slow charging state or the discharging state, the heating rate of the battery 110 is relatively slow. Therefore, at this time, the opening degree information of the second switching valve 107 can be determined based on the ratio of the first compressor speed to the second compressor speed, so as to adjust the refrigerating capacity obtained by the battery cooling circuit, and the opening degree information of the first switching valve 104 is set to be fully open to fully meet the refrigeration demand of the passenger compartment.

[0090] Step 3033: Determine that the opening degree information of the first switching valve 104 is fully closed, and determine that the opening degree information of the second switching valve 107 is fully open.

[0091] When the vehicle controller only receives the battery refrigeration request, it can fully meet the refrigeration demand of the battery. Therefore, the opening degree information of the first switching valve 104 is set to be fully closed, and the opening degree information of the second switching valve 107 is set to be fully open.

[0092] Step 3034: Determine that the opening degree information of the first switching valve 104 is fully open, and determine that the opening degree information of the second switching valve 107 is fully closed.

[0093] When the vehicle controller only receives the air-conditioning refrigeration request, it can fully meet the refrigeration demand of the passenger compartment. Therefore, the opening degree information of the first switching valve 104 is set to be fully open, and the opening degree information of the second switching valve 107 is set to be fully closed.

[0094] Step 3035: Determine that the opening degree information of both the first switching valve 104 and the second switching valve 107 is fully closed.

[0095] When the vehicle controller does not receive the battery refrigeration request or the air-conditioning refrigeration request, the opening degree information of both the first switching valve 104 and the second switching valve 107 can be set to be fully closed to stop the cooling cycles of the air-conditioning cooling circuit and the first battery cooling sub-circuit, saving power consumption.

[0096] It should be noted that in the embodiments of the present application, steps 3011-3013 have the same effects as step 201 in the previous embodiment, and steps 302, 3031, and 3012 correspond to step 202 in the previous embodiment. These steps can be referred to each other.

[0097] Step 304: Control the opening degrees of the first switching valve 104 and the second switching valve 107 based on the opening degree information of the first switching valve 104 and the second switching valve 107.

[0098] Step 304 in the embodiments of the present application corresponds to step 203 in the previous embodiment. Specifically, reference can be made to step 203, which will not be elaborated here.

[0099] In the embodiments of the present application, the vehicle controller can execute different control logics according to whether a refrigeration request is received, as well as the type and quantity of the received refrigeration request, to control the opening degrees of the first switching valve 104 and the second switching valve 107, so as to realize intelligent and precise adjustment of the distribution of the refrigeration capacity in the battery cooling circuit and the air-conditioning cooling circuit, effectively meet the refrigeration requirements in different scenarios, and greatly reduce the risk of battery thermal runaway.

[0100] In another embodiment, referring to Figure 4 , the vehicle thermal balance cooling system control method provided by the embodiments of the present application may further include the following steps.

[0101] Step 401, start.

[0102] Step 402, determine whether a battery refrigeration request is received; if so, execute Step 405, if not, execute Step 403.

[0103] Step 403, determine whether an air-conditioning refrigeration request is received; if so, execute Step 404, if not, execute Step 406.

[0104] Steps 401-403 are the processes for the vehicle controller to determine whether a refrigeration request is received and what kind of refrigeration request is received. This process can also be replaced by first determining whether an air-conditioning refrigeration request is received, and then determining whether a battery refrigeration request is received.

[0105] Step 404, control the rotation speed of the compressor 101 according to the first compressor rotation speed in the air-conditioning refrigeration request.

[0106] In Step 404, when the vehicle controller determines that only an air-conditioning refrigeration request is received, it can control the rotation speed of the compressor 101 according to the first compressor rotation speed in the air-conditioning refrigeration request. Among them, the first compressor rotation speed can be calculated by the air-conditioning controller according to information such as the temperature difference inside and outside the passenger compartment, the ambient temperature, the target temperature set by the occupant, and the temperature of the evaporator 105, or obtained by looking up a table.

[0107] Step 405, perform proportional-integral-differential (PID) control on the rotation speed of the compressor 101 based on the target temperatures of the inlet and outlet of the battery 110.

[0108] In Step 405, when the vehicle controller receives a battery refrigeration request, it performs PID control on the rotation speed of the compressor 101 according to the target temperatures of the inlet and outlet of the battery 110. It should be noted here that after the vehicle controller determines that a battery refrigeration request is received, it may no longer determine whether an air-conditioning refrigeration request is received, that is, as long as a battery refrigeration request is received, it adjusts the rotation speed of the compressor 101 according to the target temperatures of the inlet and outlet of the battery 110 to ensure the stable operation of the battery and avoid the occurrence of thermal runaway.

[0109] Specifically, the vehicle controller can obtain the target temperature of the inlet and outlet water ports of the battery 110 set in advance, detect the actual temperature of the inlet and outlet water ports of the battery 110, and continuously adjust the speed of the compressor 101 based on the difference between the actual temperature and the target temperature until the speed of the compressor 101 can make the actual temperature of the inlet and outlet water ports of the battery 110 equal to or close to the target temperature.

[0110] Step 406, end.

[0111] In the embodiment of the present application, the vehicle controller executes different logics to adjust the speed of the compressor 101 according to whether a refrigeration request is received and the type of the received refrigeration request, ensuring that as long as a battery refrigeration request is received, the speed of the compressor 101 is continuously adjusted to ensure that the battery operates within the target temperature range, and ensuring that when only an air-conditioning refrigeration request is received, the speed of the compressor 101 is adjusted based on the first compressor speed carried in the air-conditioning refrigeration request to meet the refrigeration requirements of the passenger compartment.

[0112] In some embodiments, when a battery refrigeration request is received, the foregoing method further includes:

[0113] Determine the charge and discharge state of the vehicle, and determine the target temperature of the inlet and outlet water ports of the battery 110 according to the charge and discharge state of the vehicle.

[0114] In different charge and discharge states, the refrigeration requirements of the battery 110 are different. In the embodiment of the present application, different target temperatures of the inlet and outlet water ports can be set for different charge and discharge states. Exemplarily, when the vehicle is in a fast charge state, the temperature of the inlet and outlet water ports of the battery 110 can be set as the first target water temperature. When the vehicle is in a discharge or slow charge state, the temperature of the inlet and outlet water ports of the battery 110 can be set as the second target water temperature, and the second target water temperature can be different from the first target water temperature. By setting the target temperatures of the inlet and outlet water ports in different states, the accuracy of the compressor speed control can be effectively improved, meeting the requirements for the charging time in the fast charge state of the vehicle, and meeting the requirements for cooling the battery in the discharge or slow charge state of the vehicle.

[0115] Reference Figure 1, the vehicle thermal balance cooling system provided by the embodiments of the present application may further include a cooling fan 119 and a motor drive circuit. The motor drive circuit includes a motor 120, a radiator 111, a motor cooling water pump 112, a charger 113, a direct current to direct current (DCDC) converter 114, and an inverter 115 connected in series. The cooling fan 119 is used to help the radiator 111 and the condenser 102 dissipate heat, and the condenser 102 is connected to the first expansion valve 103 through a refrigerant pipeline. In some embodiments, the system may further include a first expansion water tank 117 and a second expansion water tank 118. The first expansion water tank 117 may be connected to the motor drive circuit for replenishing water to the cooling pipeline of the motor drive circuit, and the second expansion water tank 118 may be connected to the battery cooling circuit for replenishing water to the battery cooling circuit.

[0116] The vehicle thermal balance cooling method provided by the embodiments of the present application may further include:

[0117] Step 501, when receiving an air-conditioning refrigeration request or a battery refrigeration request, determine the first fan speed of the cooling fan 119 based on the pressure of the refrigerant pipeline.

[0118] In this step, when receiving an air-conditioning refrigeration request or a battery refrigeration request, the vehicle controller determines the first fan speed of the cooling fan 119 based on the pressure of the refrigerant pipeline. The magnitude of the refrigerant pipeline pressure is closely related to the operating state of the compressor 101. When the refrigerant pipeline pressure is too high, the compressor 101 may enter a stopped state. Therefore, in the embodiments of the present application, the first fan speed of the cooling fan 119 is determined according to the magnitude of the refrigerant pipeline pressure to adjust the condensation effect of the condenser 102 by using the cooling fan 119, and further adjust the magnitude of the pressure in the refrigerant pipeline.

[0119] Specifically, determining the first fan speed of the cooling fan 119 based on the pressure of the refrigerant pipeline may include: looking up the fan speed corresponding to the current pressure value in a pre-established correspondence table of pressure values and fan speeds as the first fan speed according to the pressure value of the refrigerant pipeline.

[0120] The pressure value of the refrigerant pipeline can be measured by a pipeline sensor or determined according to the state of a pressure switch installed on the refrigerant pipeline. Exemplarily, a high-pressure switch, a low-pressure switch, a dual-pressure switch, a triple-pressure switch, etc. can be installed on the refrigerant pipeline. When different types of switches are turned on or the multi-pressure switch is in different pressure states, it can be determined that the pipeline pressure is in the corresponding pressure state. For example, in the case where a high-pressure switch and a low-pressure switch are installed, when only the low-pressure switch is turned on, it can be determined that the current refrigerant pipeline is in a low-pressure state, and the pressure range or pressure value corresponding to the low-pressure state can be used as the pressure value of the refrigerant pipeline. When both the high-pressure switch and the low-pressure switch are turned on, it can be determined that the current refrigerant pipeline is in a high-pressure state, and the pressure range or pressure value corresponding to the high-pressure state can be used as the pressure value of the refrigerant pipeline.

[0121] Step 502: Determine whether the temperature of any one of the components including the motor 120, the inverter 115, the DC converter 114, and the charger 113 exceeds the temperature threshold corresponding to that component.

[0122] In this step, components such as the motor 120, the inverter 115, the DC converter 114, and the charger 113 can continuously send their own temperature information to the vehicle controller through hardwired signals, or these components can indirectly send their own temperature information to the vehicle controller through the motor controller via the CAN network. The vehicle controller can determine whether there is a component whose actual temperature exceeds the temperature threshold corresponding to that component based on the received temperature information. When the actual temperature of a certain component exceeds the temperature threshold corresponding to that component, it indicates that the temperature of that component is too high and cooling treatment is required. At this time, step 503 is executed.

[0123] Step 503: When the temperature of any one of the components exceeds the temperature threshold corresponding to that component, determine the second fan speed of the cooling fan 119 according to the temperature of that component, and use the larger value of the first fan speed and the second fan speed as the target fan speed of the cooling fan 119.

[0124] In this step, when the actual temperature of any one of the components exceeds the temperature threshold corresponding to that component, the vehicle controller can look up the cooling fan speed (or gear) corresponding to the actual temperature of that component from the pre-stored correspondence table between component temperature and cooling fan speed (or gear) as the second fan speed of the cooling fan 119. When the actual temperatures of multiple components all exceed the corresponding temperature thresholds, the maximum cooling fan speed (or the speed corresponding to the maximum gear) found can be determined as the second fan speed of the cooling fan 119.

[0125] After obtaining the first fan speed and the second fan speed, the vehicle controller uses the larger value of the two as the target fan speed of the cooling fan 119, so as to ensure that the refrigeration requirements of the air conditioner or the battery and the refrigeration requirements of the components in the motor drive circuit are all met.

[0126] Step 504, when the temperature of any component does not exceed the temperature threshold corresponding to the component, use the first fan speed as the target fan speed of the cooling fan 119.

[0127] In this step, when the vehicle controller determines that the temperature of any component does not exceed the temperature threshold corresponding to the component, it determines that there is no refrigeration requirement for the components in the current motor drive circuit, so it directly determines the first fan speed as the target fan speed to meet the refrigeration requirements of the air conditioner or the battery.

[0128] Step 505, control the cooling fan 119 to operate at the target fan speed.

[0129] After the vehicle controller determines the target fan speed, it can control the cooling fan 119 to operate at the target fan speed.

[0130] In some embodiments, the vehicle thermal balance cooling system control method provided by the embodiments of the present application further includes:

[0131] When receiving an over-temperature fault signal sent by any one of the motor 120, the inverter 115, the DC converter 114, and the charger 113, control the cooling fan 119 to operate at the third fan speed.

[0132] In this embodiment, when the vehicle controller receives an over-temperature fault signal sent by any one of the motor 120, the inverter 115, the DC converter 114, and the charger 113, it can directly control the cooling fan 119 to operate at the third fan speed. The third fan speed can be the fan speed corresponding to the high gear or the highest speed of the cooling fan 119 to timely improve the refrigeration effect and meet the refrigeration requirements of the components in the motor drive circuit.

[0133] In some embodiments, the vehicle thermal balance cooling system control method further includes any one of the following:

[0134] When it is detected that the vehicle is in a ready-to-start state, control the motor cooling water pump 112 to operate at the first motor water pump speed;

[0135] Determine whether the temperature of any one of the motor 120, the inverter 115, the DC converter 114, and the charger 113 exceeds the temperature threshold corresponding to the component. When it exceeds, determine the second motor water pump speed of the motor cooling water pump 112 according to the temperature of the component, and control the motor cooling water pump 112 to operate at the second motor water pump speed;

[0136] When a refrigeration request for the charger 113 or the DC converter 114 is detected, control the motor cooling water pump 112 to operate at the third motor water pump speed;

[0137] When an over-temperature fault signal sent by any one of the motor 120, the inverter 115, the DC converter 114, and the charger 113 is received, control the motor cooling water pump 112 to operate at the maximum motor water pump speed.

[0138] In the embodiment of the present application, the vehicle controller uses multiple groups of control logics that can be executed in parallel to control the speed of the motor cooling water pump 112. The motor cooling water pump 112 is used to control the cooling water circulation speed of the motor drive circuit.

[0139] Specifically, when the vehicle controller detects that the vehicle is in the ready-to-start state (Ready state), it can control the motor cooling water pump 112 to operate at the first motor water pump speed, so as to start the cooling cycle of the motor drive circuit before the vehicle starts. This can effectively avoid the situation that the components in the motor drive circuit are burned out when the occupant suddenly increases the throttle after starting the vehicle.

[0140] When the vehicle is in operation, the vehicle controller can also determine whether the temperature of any one of the motor 120, the inverter 115, the DC converter 114, and the charger 113 exceeds the temperature threshold corresponding to the component. When it exceeds, it is determined that any one of the components enters the over-temperature state. At this time, determine the second motor water pump speed of the motor cooling water pump 112 according to the temperature of any one of the components, and control the motor cooling water pump 112 to operate at the second motor water pump speed. Specifically, the vehicle controller can pre-store a correspondence table between component temperature and motor water pump speed, and determine the motor water pump speed corresponding to the current component temperature by looking up the table.

[0141] For some components of the motor drive circuit, such as the charger 113 and the DC converter 114, multiple temperature sensors can be provided inside. These temperature sensors can all transmit the detected temperature information to the motor control unit (abbreviated as MCU) or the vehicle control unit (abbreviated as VCU) through hard wires or the CAN network. For components with multiple temperature sensors, these components can also be built-in with some logic judgment units to perform certain logic judgments to determine whether they are in an over-temperature state, and send a refrigeration request to the motor drive system or the vehicle control unit when it is determined that they are in an over-temperature state. The vehicle control unit can directly receive the refrigeration requests from these components, or receive the refrigeration requests of the components forwarded by the motor control unit, and in response to the refrigeration requests, control the motor cooling water pump 112 to operate at the third motor water pump speed to help these components cool down quickly. The third motor water pump speed can be the speed corresponding to the high gear or the maximum speed.

[0142] When the vehicle control unit receives an over-temperature fault signal sent by any one of the components of the motor 120, the inverter 115, the DC converter 114, and the charger 113, it can directly control the motor cooling water pump 112 to operate at the maximum motor water pump speed to help the over-temperature components cool down as quickly as possible and ensure the working stability of each component of the motor drive circuit.

[0143] In summary, in the embodiments of the present application, the vehicle control unit can also flexibly adjust the speed of the motor water pump according to the vehicle state and the states of each component to ensure the working stability of each component of the motor drive circuit.

[0144] In some embodiments, the vehicle thermal balance cooling system control method further includes any one of the following:

[0145] When receiving a battery temperature equalization request, determine the first battery water pump speed of the battery cooling water pump 109 according to the temperature information in the battery temperature equalization request, and control the battery cooling water pump 109 to operate at the first battery water pump speed, where the battery temperature equalization request is generated when the temperatures of the battery inlet and outlet exceed the first threshold;

[0146] When receiving a battery refrigeration request, control the battery cooling water pump 109 to operate at the second battery water pump speed, where the battery refrigeration request is generated when the temperature of any battery cell in the battery module is higher than the second threshold.

[0147] In the embodiment of the present application, when the temperature difference between the water inlet and the water outlet of the battery exceeds the first threshold, the battery management system may generate a battery temperature equalization request and send the battery temperature equalization request to the vehicle controller. The battery temperature equalization request may carry temperature information such as the temperature difference between the water inlet and the water outlet of the battery. The vehicle controller may, according to the request, look up the mapping relationship table between the temperature difference value between the water inlet and the water outlet of the battery and the battery water pump speed, and determine the battery water pump speed corresponding to the current temperature difference value between the water inlet and the water outlet of the battery as the first battery water pump speed. The first threshold may be the temperature difference value between the inlet and outlet of the battery when the temperature of the battery inlet and outlet is pre-calibrated to be large, resulting in poor battery performance.

[0148] Meanwhile, when the vehicle controller receives a battery cooling request, it may also control the battery cooling water pump 109 to operate at the second battery water pump speed. The battery cooling request may be generated by the battery management system when it detects that the temperature of any battery cell in the battery module is higher than the second threshold. The second threshold may be the temperature value when the battery cell may not work properly due to overheating pre-calibrated.

[0149] It can be seen that in the embodiment of the present application, the vehicle controller can flexibly adjust the speed of the battery cooling water pump 109 in response to the battery temperature equalization request or the battery cooling request, so as to adjust the coolant circulation speed of the battery cooling circuit, improve the battery cooling effect, and improve the battery operating stability.

[0150] It should be noted that in the vehicle thermal balance cooling system involved in the present application, components such as the battery 110 and the battery cooling water pump 109 can be communicatively connected to the battery management system; components such as the motor 120, the DC converter 114, the charger 113, the inverter 115, the motor cooling water pump 112, and the radiator 111 can be communicatively connected to the motor controller; components such as the compressor 101, the condenser 102, the first switching valve 104, and the evaporator 105 can be communicatively connected to the air conditioning controller; components such as the charger 113, the DC converter 114, and the pipeline pressure detector installed on the refrigerant pipeline can also be directly communicatively connected to the vehicle controller. In Figure 1 it, only the controller 100 is taken as an example, and a communication connection between some components and the controller is represented by a dotted line. However, the "controller" here can actually be at least one of the vehicle controller, the battery management system, the electric drive system, or the air conditioning controller, and the communication connection is not limited to Figure 1 the dotted line shown.

[0151] Figure 6 shows the communication methods between different components or controllers and the vehicle controller in the method provided by the embodiment of the present application, as well as the communication methods when the vehicle controller controls the operating parameters of different components. Refer to Figure 6, the battery management system, the motor controller, and the air conditioner controller can communicate with the vehicle controller through the CAN network. The charger 113 and the DC converter 114 can also communicate with the vehicle controller through the CAN network. The pipeline pressure detector can communicate with the vehicle controller through hardwired signals. The vehicle controller can send control signals to the motor cooling water pump 112, the battery cooling water pump 109, the cooling fan 119, the switching valve, etc. in the form of pulse width modulation signals (duty cycle signals). After receiving the control signals, the motor cooling water pump 112, the battery cooling water pump 109, the cooling fan 119, etc. can convert the duty cycle signals into corresponding rotational speed signals, and the switching valve can convert the duty cycle signals into opening degrees. For the case where the switching valve is a shut-off valve, the vehicle controller can directly send an opening / closing request to the switching valve to enable the switching valve to achieve opening / closing switching. The vehicle controller can send a rotational speed signal to the compressor 101 to make the compressor 101 operate at a specified rotational speed. Correspondingly, the motor cooling water pump 112, the battery cooling water pump 109, the cooling fan 119, the compressor 101, etc. can also feedback fault information to the vehicle controller to enable the vehicle controller to obtain the fault information in a timely manner.

[0152] In summary, the vehicle thermal balance cooling system control method provided by the embodiments of the present application can realize that when the air conditioner cooling request and the battery cooling request exist simultaneously, according to the cooling demand amounts corresponding to the two requests and the charging and discharging state of the vehicle currently, intelligently allocate the cooling capacity between the air conditioner cooling circuit and the battery cooling circuit, fully ensure the cooling demand of the battery on the basis of taking into account the cooling demand of the passenger compartment, and effectively reduce the risk of battery thermal runaway. Moreover, the vehicle controller can also flexibly adjust the operating conditions of the cooling fan, the motor cooling water pump, the battery cooling water pump, and the compressor based on the temperature information and fault information of multiple key components, and comprehensively consider the charging and discharging state of the vehicle to ensure that each key component always operates stably.

[0153] On the other hand, the embodiments of the present application also provide a vehicle thermal balance cooling system control device. This device is applied to the aforementioned vehicle thermal balance cooling system. The device includes:

[0154] A detection module 701, configured to detect whether an air conditioner cooling request and a battery cooling request are received. The air conditioner cooling request carries a first compressor rotational speed, and the battery cooling request carries a second compressor rotational speed;

[0155] A determination module 702, configured to, when the air conditioner cooling request and the battery cooling request are received, determine the opening degree information of the first switching valve 104 and the opening degree information of the second switching valve 107 according to the ratio of the first compressor rotational speed to the second compressor rotational speed and the charging and discharging state of the vehicle;

[0156] The control module 703 is configured to control the opening degrees of the first switching valve 104 and the second switching valve 107 based on the opening degree information of the first switching valve 104 and the opening degree information of the second switching valve 107.

[0157] Optionally, the determination module 701 is further configured to determine the charge and discharge state of the vehicle, where the charge and discharge state includes a fast charge state, a slow charge state, and a discharge state; when the vehicle is in the fast charge state, based on the ratio of the first compressor speed to the second compressor speed, determine the opening degree information of the first switching valve 104 and the opening degree information of the second switching valve 107; when the vehicle is in the slow charge state or the discharge state, based on the ratio of the first compressor speed to the second compressor speed, determine the opening degree information of the second switching valve 107, and set the opening degree information of the first switching valve 104 to fully open.

[0158] Optionally, the determination module 701 is further configured to, when only receiving an air conditioning cooling request, determine that the opening degree information of the first switching valve 104 is fully open and the opening degree information of the second switching valve 107 is fully closed; when only receiving a battery cooling request, determine that the opening degree information of the first switching valve 104 is fully closed and the opening degree information of the second switching valve 107 is fully open.

[0159] Optionally, the control module 703 is further configured to, when receiving a battery cooling request, perform proportional-integral-derivative (PID) control on the speed of the compressor 101 based on the target temperatures of the inlet and outlet water of the battery 110; when not receiving a battery cooling request but receiving an air conditioning cooling request, control the speed of the compressor 101 according to the first compressor speed in the air conditioning cooling request.

[0160] Optionally, the determination module 701 is further configured to, when receiving a battery cooling request, determine the charge and discharge state of the vehicle, and determine the target temperatures of the inlet and outlet water of the battery 110 according to the charge and discharge state of the vehicle.

[0161] Optionally, the determination module 701 is further configured to:

[0162] When receiving an air conditioning cooling request or a battery cooling request, determine the first fan speed of the cooling fan 119 based on the pressure of the refrigerant pipeline;

[0163] Determine whether the temperature of any one of the motor 120, the inverter 115, the DC converter 114, and the charger 113 exceeds the temperature threshold corresponding to any one of the components;

[0164] When there is a temperature of any one of the components exceeding the temperature threshold corresponding to any one of the components, determine the second fan speed of the cooling fan 119 according to the temperature of any one of the components, and use the larger value of the first fan speed and the second fan speed as the target fan speed of the cooling fan 119;

[0165] When the temperature of none of the components exceeds the temperature threshold corresponding to any component, the first fan speed is used as the target fan speed of the cooling fan 119;

[0166] The control module 703 is further configured to control the cooling fan 119 to operate at the target fan speed.

[0167] Optionally, the control module 703 is further configured to control the cooling fan 119 to operate at the third fan speed when receiving an over-temperature fault signal sent by any one of the motor 120, the inverter 115, the DC converter 114, and the charger 113.

[0168] Optionally, the control module 703 is further configured to:

[0169] When detecting that the whole vehicle is in a ready-to-start state, control the motor cooling water pump 112 to operate at the first motor water pump speed;

[0170] Determine whether the temperature of any one of the motor 120, the inverter 115, the DC converter 114, and the charger 113 exceeds the temperature threshold corresponding to any component. When it exceeds, determine the second motor water pump speed of the motor cooling water pump 112 according to the temperature of any component, and control the motor cooling water pump 112 to operate at the second motor water pump speed;

[0171] When detecting a refrigeration request for the charger 113 or the DC converter 114, control the motor cooling water pump 112 to operate at the third motor water pump speed;

[0172] When receiving an over-temperature fault signal sent by any one of the motor 120, the inverter 115, the DC converter 114, and the charger 113, control the motor cooling water pump 112 to operate at the maximum motor water pump speed.

[0173] Optionally, the control module 703 is further configured to:

[0174] When receiving a battery temperature equalization request, determine the first battery water pump speed of the battery cooling water pump 109 according to the temperature information in the battery temperature equalization request, and control the battery cooling water pump 109 to operate at the first battery water pump speed, where the battery temperature equalization request is generated when the temperatures at the inlet and outlet of the battery exceed the first threshold;

[0175] When receiving a battery refrigeration request, control the battery cooling water pump 109 to operate at the second battery water pump speed, where the battery refrigeration request is generated when the temperature of any battery cell in the battery module is higher than the second threshold.

[0176] It should be noted that the device provided in the embodiments of the present application corresponds to the foregoing method embodiments. The division of modules in this embodiment is only exemplary, and in other embodiments, the division method of modules can be adjusted according to requirements. The specific operation logic of the modules in the device embodiments of the present application can refer to the method embodiments, and will not be elaborated here.

[0177] The vehicle thermal balance cooling system control device provided in the embodiments of the present application can realize that when the air-conditioning refrigeration request and the battery refrigeration request exist simultaneously, according to the refrigeration demand amounts corresponding to the two requests and the current charge and discharge state of the vehicle, the refrigeration capacity is intelligently allocated between the air-conditioning cooling circuit and the battery cooling circuit, fully ensuring the refrigeration demand of the battery on the basis of taking into account the refrigeration demand of the passenger compartment, and effectively reducing the risk of battery thermal runaway. Moreover, the vehicle controller can also flexibly adjust the operating conditions of the cooling fan, the motor cooling water pump, the battery cooling water pump, and the compressor based on the temperature information and fault information of multiple key components, and comprehensively consider the charge and discharge state of the vehicle, so as to ensure that each key component always operates stably.

[0178] In the present application, the terms "first" and "second" are only used for descriptive purposes and cannot be construed as indicating or implying relative importance. The term "plural" means two or more, unless otherwise clearly defined.

[0179] After considering the specification and practicing the present application disclosed herein, those skilled in the art will readily think of other implementation manners of the present application. The present application is intended to cover any variations, uses, or adaptive changes of the present application, and these variations, uses, or adaptive changes follow the general principles of the present application and include the common general knowledge or conventional technical means in the technical field not disclosed in the present application. The specification and the embodiments are only regarded as exemplary.

[0180] It should be understood that the present application is not limited to the exact structure already described and shown in the drawings, and various modifications and changes can be made without departing from its scope. The scope of the present application is only limited by the appended claims.

Claims

1. A control method for a vehicle thermal balance cooling system, characterized in that, the system includes an air-conditioning cooling circuit and a battery cooling circuit. The air-conditioning cooling circuit includes a first branch and a second branch connected in parallel. The first branch includes a first switching valve (104) and an evaporator (105) connected in series. The second branch includes a second switching valve (107) and a first heat exchange pipeline of a heat exchanger (108). The battery cooling circuit includes a battery (110) and a second heat exchange pipeline of the heat exchanger (108). The first heat exchange pipeline and the second heat exchange pipeline are adjacent to each other for heat transfer. The first switching valve (104) is a cut-off valve, and the cut-off valve is a control valve with only two states: open and closed. The second switching valve (107) is an electronic proportional valve. The air-conditioning cooling circuit further includes a compressor (101); the method includes: detecting whether an air-conditioning refrigeration request and a battery refrigeration request are received. The air-conditioning refrigeration request carries a first compressor speed, and the battery refrigeration request carries a second compressor speed; when the air-conditioning refrigeration request and the battery refrigeration request are received, determining the charge and discharge state of the vehicle, where the charge and discharge state includes a fast charge state, a slow charge state, and a discharge state; when the vehicle is in the fast charge state, based on the ratio of the first compressor speed to the second compressor speed, looking up the opening degree of the electronic proportional valve corresponding to the ratio from a preset correspondence table between the ratio and the opening degree of the electronic proportional valve; obtaining a compressor speed ratio threshold corresponding to the cut-off valve. When it is determined that the ratio of the first compressor speed to the second compressor speed is greater than the compressor speed ratio threshold, determining that the opening information of the cut-off valve is open, otherwise determining that the opening state of the cut-off valve is closed; controlling the opening degrees of the first switching valve (104) and the second switching valve (107) based on the opening degree information of the first switching valve (104) and the opening degree information of the second switching valve (107); the method further includes: when it is detected that the temperature of the battery (110) is higher than a preset temperature threshold, directly closing the cut-off valve, where the temperature threshold corresponds to the temperature when the battery (110) has an overheat fault; the method further includes: when the battery refrigeration request is received, determining the charge and discharge state of the vehicle, and determining the target temperature of the inlet and outlet of the battery (110) according to the charge and discharge state of the vehicle. Among them, the set temperature of the inlet and outlet of the battery (110) corresponding to the fast charge state is a first target water temperature, and the set temperature of the inlet and outlet of the battery (110) corresponding to the discharge or slow charge state is a second target water temperature, and the second target water temperature is different from the first target water temperature; performing proportional-integral-derivative (PID) control on the speed of the compressor (101) based on the target temperature of the inlet and outlet of the battery (110).

2. The method according to claim 1, characterized in that, After the step of determining the charge and discharge state of the vehicle when receiving the air-conditioning refrigeration request and the battery refrigeration request, the method further includes: when the vehicle is in the slow charge state or the discharge state, determining the opening information of the second switching valve (107) based on the ratio of the first compressor speed to the second compressor speed, and setting the opening information of the first switching valve (104) to be fully open.

3. The method according to claim 1, wherein, when only receiving the air-conditioning refrigeration request, determining that the opening information of the first switching valve (104) is fully open and the opening information of the second switching valve (107) is fully closed; when only receiving the battery refrigeration request, determining that the opening information of the first switching valve (104) is fully closed and the opening information of the second switching valve (107) is fully open.

4. The method according to claim 1, wherein, the method further includes: when receiving the air-conditioning refrigeration request without receiving the battery refrigeration request, controlling the speed of the compressor (101) according to the first compressor speed in the air-conditioning refrigeration request.

5. The method according to claim 1, wherein, the system further includes a cooling fan (119) and a motor drive circuit. The motor drive circuit includes a motor (120), a charger (113), a DC converter (114) and an inverter (115) connected in series. The air-conditioning cooling circuit further includes a condenser (102) and a first expansion valve (103). The condenser (102) is connected to the first expansion valve (103) through a refrigerant pipeline; the method further includes: when receiving the air-conditioning refrigeration request or the battery refrigeration request, determining the first fan speed of the cooling fan (119) based on the pressure of the refrigerant pipeline; determining whether the temperature of any one of the motor (120), the inverter (115), the DC converter (114) and the charger (113) exceeds the temperature threshold corresponding to the any one of the components; when there is a temperature of any one of the components exceeding the temperature threshold corresponding to the any one of the components, determining the second fan speed of the cooling fan (119) according to the temperature of the any one of the components, and taking the larger value of the first fan speed and the second fan speed as the target fan speed of the cooling fan (119); when there is no temperature of any one of the components exceeding the temperature threshold corresponding to the any one of the components, taking the first fan speed as the target fan speed of the cooling fan (119); controlling the cooling fan (119) to operate at the target fan speed.

6. The method according to claim 5, wherein, the method further includes: when receiving an over-temperature fault signal sent by any one of the motor (120), the inverter (115), the DC converter (114) and the charger (113), controlling the cooling fan (119) to operate at a third fan speed.

7. The method according to claim 1, wherein, the system further includes a motor drive circuit, and the motor drive circuit includes a motor (120), a motor cooling water pump (112), a charger (113), a DC converter (114), and an inverter (115) connected in series; the method further includes any one of the following: when it is detected that the whole vehicle is in a ready-to-start state, controlling the motor cooling water pump (112) to operate at a first motor water pump speed; determining whether the temperature of any one of the motor (120), the inverter (115), the DC converter (114), and the charger (113) exceeds the temperature threshold corresponding to the any one of the components, and when it exceeds, determining a second motor water pump speed of the motor cooling water pump (112) according to the temperature of the any one of the components, and controlling the motor cooling water pump (112) to operate at the second motor water pump speed; when a refrigeration request for the charger (113) or the DC converter (114) is detected, controlling the motor cooling water pump (112) to operate at a third motor water pump speed; when an over-temperature fault signal sent by any one of the motor (120), the inverter (115), the DC converter (114), and the charger (113) is received, controlling the motor cooling water pump (112) to operate at the maximum motor water pump speed.

8. The method according to claim 1, wherein, the battery cooling circuit further includes a battery cooling water pump (109), and the method further includes any one of the following: when a battery temperature equalization request is received, determining a first battery water pump speed of the battery cooling water pump (109) according to the temperature information in the battery temperature equalization request, and controlling the battery cooling water pump (109) to operate at the first battery water pump speed, wherein the battery temperature equalization request is generated when the temperatures of the battery inlet and outlet exceed a first threshold; when the battery refrigeration request is received, controlling the battery cooling water pump (109) to operate at a second battery water pump speed, wherein the battery refrigeration request is generated when the temperature of any one battery cell in the battery module is higher than a second threshold.

9. A control device for a vehicle thermal balance cooling system, wherein, the system includes an air-conditioning cooling circuit and a battery cooling circuit. The air-conditioning cooling circuit includes a first branch and a second branch connected in parallel. The first branch includes a first switching valve (104) and an evaporator (105) connected in series. The second branch includes a second switching valve (107) and a first heat exchange pipeline of a heat exchanger (108). The battery cooling circuit includes a battery (110) and a second heat exchange pipeline of the heat exchanger (108). The first heat exchange pipeline and the second heat exchange pipeline are adjacent to perform heat transfer. The first switching valve (104) is a shut-off valve, and the shut-off valve is a control valve with only two states of open and closed. The second switching valve (107) is an electronic proportional valve. The air-conditioning cooling circuit further includes a compressor (101); the device includes: A detection module for detecting whether an air-conditioning refrigeration request and a battery refrigeration request are received. The air-conditioning refrigeration request carries a first compressor speed, and the battery refrigeration request carries a second compressor speed; A determination module for determining the charge-discharge state of the vehicle when the air-conditioning refrigeration request and the battery refrigeration request are received. The charge-discharge state includes a fast-charging state, a slow-charging state, and a discharging state. When the vehicle is in the fast-charging state, based on the ratio of the first compressor speed to the second compressor speed, look up the opening degree of the electronic proportional valve corresponding to the ratio from a preset correspondence table of the ratio and the opening degree of the electronic proportional valve. Obtain the compressor speed ratio threshold corresponding to the cut-off valve. When it is determined that the ratio of the first compressor speed to the second compressor speed is greater than the compressor speed ratio threshold, determine that the opening information of the cut-off valve is open, otherwise determine that the opening state of the cut-off valve is closed; A control module for controlling the opening degrees of the first switching valve (104) and the second switching valve (107) based on the opening degree information of the first switching valve (104) and the opening degree information of the second switching valve (107); The device is further configured to: directly close the cut-off valve when it is detected that the temperature of the battery (110) is higher than a preset temperature threshold, and the temperature threshold corresponds to the temperature at which the battery (110) has an overheat fault; The determination module is further configured to: determine the charge-discharge state of the vehicle when the battery refrigeration request is received, and determine the target temperature of the inlet and outlet water of the battery (110) according to the charge-discharge state of the vehicle. Among them, the set temperature of the inlet and outlet water of the battery (110) corresponding to the fast-charging state is the first target water temperature, and the set temperature of the inlet and outlet water of the battery (110) corresponding to the discharging or slow-charging state is the second target water temperature, and the second target water temperature is different from the first target water temperature; The control module is further configured to: perform proportional-integral-derivative (PID) control on the speed of the compressor (101) based on the target temperature of the inlet and outlet water of the battery (110).

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