Vehicle thermal management method and system
Through the thermal domain controller, the refrigerant and coolant circuits inside the vehicle are unifiedly controlled, which solves the problems of high computing costs and low thermal management efficiency in the prior art, and achieves a lower cost and efficient thermal management solution.
Patent Information
- Application Number
- CN202510366424.8
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2025-03-26
- Publication Date
- 2025-05-13
AI Technical Summary
The existing vehicle thermal management technology has shortcomings in computing cost control and thermal management efficiency, resulting in improved system energy consumption and reduced thermal management efficiency.
The medium in the refrigerant circuit or coolant circuit flows through the target object through the thermal domain controller to meet its thermal needs and achieve unified thermal management of all preset objects in the vehicle.
It reduces the calculation cost of heat management, improves the efficiency of heat management, and can meet the heating needs of some passenger compartments without the need for air conditioning, further reducing the heating cost.
Smart Images
Figure CN119974896A_ABST
Abstract
Description
Technical Field
[0001] The present application relates to the field of vehicle thermal management technology, and in particular to a vehicle thermal management method and system. Background Art
[0002] In the existing field of vehicle thermal management technology, in order to achieve temperature control in different areas inside the vehicle, a distributed control strategy is usually adopted. Specifically, this strategy distributes the thermal management control functions of each area of the vehicle to multiple independent electronic control units (ECUs). Each ECU must independently execute the judgment and control logic related to thermal management to ensure that the temperature in the corresponding area is maintained within the preset range. Although this technical solution has achieved regionalized precise temperature control to a certain extent, it also brings about a significant increase in computing costs. Since each ECU needs to perform independent computing processing, the computing cost is increased, which not only puts higher requirements on hardware resources, but also leads to an increase in the overall system energy consumption and reduces the thermal management efficiency.
[0003] In summary, although the existing vehicle thermal management technology has met the needs of regional temperature control to a certain extent, it still has shortcomings in computing cost control and thermal management efficiency. A more low-cost and efficient thermal management solution is urgently needed to improve it. Summary of the invention
[0004] The present application provides a vehicle thermal management method and system to reduce the computational cost of thermal management and improve thermal management efficiency.
[0005] The present application provides a vehicle thermal management method, comprising:
[0006] During the operation of the vehicle, a temperature parameter of a preset object is obtained, where the preset object is an object in the vehicle that needs to be heated or cooled;
[0007] Determining the heat demand of the preset object according to the temperature parameters of the preset object;
[0008] When a target object with thermal demand appears in the preset objects, the medium in the refrigerant circuit or the coolant circuit is controlled by the thermal domain controller to flow through the target object to meet the thermal demand of the target object, wherein the thermal domain controller is used to control the refrigerant circuit and the coolant circuit to meet the reduction of thermal demand of all preset objects.
[0009] The beneficial effect of the present application is that the refrigerant circuit or the coolant circuit can be controlled by the thermal domain controller to flow through the target object, thereby meeting the thermal requirements of all preset objects that need heating or cooling. Compared with the distributed control strategy, the present application can uniformly meet the thermal requirements of all preset objects that need heating or cooling through the thermal domain controller, thereby reducing the computational cost of thermal management and improving the thermal management efficiency.
[0010] In one embodiment, determining the thermal demand of the preset object according to the temperature parameter of the preset object includes:
[0011] When the preset object is a passenger cabin, determining the heat demand of the preset object according to a comparison result between the temperature of the passenger cabin and the temperature set by the user;
[0012] When the preset object is a battery, the thermal demand of the battery is determined according to the current temperature of the battery and a preset temperature and thermal demand correspondence table;
[0013] When the preset object is a motor, whether the motor needs cooling is determined according to the current temperature of the motor and the correspondence between the preset temperature and the cooling level.
[0014] In one embodiment, when the target object is a passenger compartment and the thermal demand is a heating demand, controlling the medium in the refrigerant circuit or the coolant circuit to flow through the target object through the thermal domain controller to meet the thermal demand of the target object includes:
[0015] Determine whether there is waste heat in the battery circuit or motor circuit through the thermal domain controller;
[0016] When there is waste heat in the battery circuit or the motor circuit, the waste heat in the battery circuit or the motor circuit is recovered to the refrigerant circuit through the coolant circuit by the thermal domain controller;
[0017] The plate heat exchanger is controlled by a heat domain controller to transfer the waste heat to the passenger compartment circuit, so as to heat the passenger compartment circuit.
[0018] The beneficial effect of this embodiment is that when there is waste heat in the battery circuit or the motor circuit, the waste heat in the battery circuit or the motor circuit is recovered to the refrigerant circuit through the coolant circuit by the thermal domain controller; the plate heat exchanger is controlled by the thermal domain controller to transfer the waste heat to the passenger compartment circuit to achieve heating of the passenger compartment circuit, thereby meeting the heating needs of at least part of the passenger compartment without the need for air conditioning for heating, thereby reducing heating costs.
[0019] In one embodiment, the method further comprises:
[0020] When the plate heat exchanger is controlled by the thermal domain controller to transfer the waste heat to the passenger compartment circuit, determining whether the waste heat meets the heating demand of the passenger compartment;
[0021] When the waste heat cannot meet the heating demand of the passenger compartment, the electric compressor is controlled by the thermal domain controller to perform auxiliary heating on the passenger compartment.
[0022] The beneficial effect of this embodiment is that when waste heat cannot meet the heating demand of the passenger compartment, the electric compressor can be controlled by the thermal domain controller to perform auxiliary heating on the passenger compartment, thereby meeting the heating demand of the passenger compartment while reducing the heating cost.
[0023] In one embodiment, the method further comprises:
[0024] When there is no waste heat in the battery circuit or the motor circuit, the electric compressor is controlled by the thermal domain controller to heat the passenger compartment.
[0025] In one embodiment, when the target object is a battery and the thermal demand is a heating demand, controlling the medium in the refrigerant circuit or the coolant circuit to flow through the target object through the thermal domain controller to meet the thermal demand of the target object includes:
[0026] obtaining a temperature of the battery;
[0027] When the battery temperature is within the temperature range of normal heating conditions, the battery circuit water pump drives the coolant to self-circulate and heat the battery;
[0028] When the temperature of the battery is lower than the critical temperature corresponding to the extremely cold working condition, the high-voltage electric heater is controlled by the thermal domain controller to heat the battery, and the heating amount is preferentially allocated to the battery.
[0029] The beneficial effects of this embodiment are as follows: under extremely cold conditions, since the evaporating temperature, intake air density and refrigerant mass flow rate are all low, excessive air-conditioning compressor speed will cause liquid in the intake air, and the exhaust temperature of the compressor will also be too high. Therefore, under extremely cold conditions, the high-voltage electric heater is controlled by the thermal domain controller to heat the battery, and the heating amount is allocated to the battery first, thereby avoiding the problem of liquid in the intake air and excessive exhaust temperature caused by excessive air-conditioning compressor speed, thereby improving the safety of thermal management.
[0030] In one embodiment, when the target object is a battery and a passenger compartment, and the thermal requirements of the battery and the passenger compartment are the same, controlling the medium in the refrigerant circuit or the coolant circuit to flow through the target object through the thermal domain controller to meet the thermal requirements of the target object includes:
[0031] Controlling the four-way valve connecting the battery and the passenger compartment to open through a thermal domain controller so that the battery and the passenger compartment are in communication;
[0032] The plate heat exchanger is controlled by a thermal domain controller to heat or cool the connected battery and passenger compartment, so as to meet the thermal requirements of the battery and the passenger compartment at the same time.
[0033] The beneficial effect of this embodiment is that when the target objects are the battery and the passenger compartment, and the thermal requirements of the battery and the passenger compartment are the same, the battery and the passenger compartment can be connected by controlling the thermal domain controller, so that the plate heat exchanger can heat or cool the connecting area between the battery and the passenger compartment to meet the thermal requirements of the battery and the passenger compartment at the same time, without the need to heat or cool the two separately, further reducing the cost of thermal management.
[0034] In one embodiment, when the target object is a battery and a motor, and the thermal requirements of the battery and the motor are both cooling requirements, controlling the medium in the refrigerant circuit or the coolant circuit to flow through the target object through the thermal domain controller to meet the thermal requirements of the target object includes:
[0035] Controlling the six-way valve connecting the battery and the motor to open through a thermal domain controller so that the battery and the motor are connected;
[0036] The coolant is controlled by a thermal domain controller to heat or cool the connected battery and motor to meet the thermal requirements of the battery and motor at the same time.
[0037] The beneficial effect of this embodiment is that when the target objects are batteries and motors, and the thermal demands of the batteries and motors are both cooling demands, the coolant is controlled by the thermal domain controller to heat or cool the connected batteries and motors, so as to simultaneously meet the thermal demands of the batteries and motors without the need to cool them separately, thereby further reducing the cost of thermal management.
[0038] The present application also provides a vehicle thermal management system, which is used in the vehicle thermal management method described in any one of the above embodiments, including:
[0039] A thermal domain controller, which is used to connect to the refrigerant circuit and the coolant circuit respectively, and to control the flow direction of the medium in the refrigerant circuit and the coolant circuit to meet the thermal demand of all preset objects, wherein the preset objects are objects in the vehicle that need to be heated or cooled;
[0040] The refrigerant circuit is connected to each air conditioning module in the vehicle;
[0041] The coolant circuit is connected to various preset objects in the car.
[0042] In one embodiment, the thermal management system further comprises:
[0043] A four-way valve is used to connect the battery and the passenger compartment in the preset object, and when the battery and the passenger compartment have the same heat demand, the battery and the passenger compartment are connected so that the plate heat exchanger deflates to meet the heat demand of the battery and the passenger compartment;
[0044] The six-way valve is used to connect the battery and the motor in the preset object. When the battery and the motor have the same thermal requirements, the battery and the motor are connected so that the plate heat exchanger deflates to meet the thermal requirements of the battery and the motor.
[0045] Other features and advantages of the present application will be described in the following description, and partly become apparent from the description, or be understood by practicing the present application. The purpose and other advantages of the present application can be realized and obtained by the structures specifically pointed out in the written description, claims, and drawings.
[0046] The technical solution of the present application is further described in detail below through the accompanying drawings and embodiments. BRIEF DESCRIPTION OF THE DRAWINGS
[0047] The accompanying drawings are used to provide a further understanding of the present application and constitute a part of the specification. Together with the embodiments of the present application, they are used to explain the present application and do not constitute a limitation of the present application. In the accompanying drawings:
[0048] Figure 1 This is a flow chart of a vehicle thermal management method in one embodiment of the present application;
[0049] Figure 2 This is a schematic diagram of the structure of a vehicle thermal management system in one embodiment of the present application. DETAILED DESCRIPTION
[0050] The preferred embodiments of the present application are described below in conjunction with the accompanying drawings. It should be understood that the preferred embodiments described herein are only used to illustrate and explain the present application and are not used to limit the present application.
[0051] Figure 1 Flow chart of a vehicle thermal management method in one embodiment of the present application, such as Figure 1 As shown, the method can be implemented as the following steps S101-S103:
[0052] In step S101, during the operation of the vehicle, a temperature parameter of a preset object is obtained, where the preset object is an object in the vehicle that needs to be heated or cooled;
[0053] In step S102, the heat demand of the preset object is determined according to the temperature parameter of the preset object;
[0054] In step S103, when a target object with thermal demand appears in the preset objects, the medium in the refrigerant circuit or the coolant circuit is controlled by the thermal domain controller to flow through the target object to meet the thermal demand of the target object, wherein the thermal domain controller is used to control the refrigerant circuit and the coolant circuit to meet the reduced thermal demand of all preset objects.
[0055] In the present application, during the operation of the vehicle, the temperature parameters of a preset object are obtained, and the preset object is an object in the vehicle that needs to be heated or cooled; usually, the objects that need to be heated in the vehicle include the passenger compartment and the battery, and the objects that need to be cooled include the motor in addition to the passenger compartment and the battery.
[0056] The thermal demand of the preset object is determined according to the temperature parameters of the preset object. Specifically, when the preset object is a passenger compartment, the thermal demand of the preset object is determined according to the comparison result between the temperature of the passenger compartment and the temperature set by the user; when the preset object is a battery, the thermal demand of the battery is determined according to the current temperature of the battery and a correspondence table between the preset temperature and the thermal demand; when the preset object is a motor, it is determined whether the motor needs to be cooled according to the current temperature of the motor and the correspondence between the preset temperature and the cooling level.
[0057] For example, the cooling and heating requirements of the passenger compartment, battery, and motor can be determined in the following ways:
[0058] The thermal demand of the passenger compartment is determined as follows:
[0059] Calculate the interior temperature in the car - the target interior temperature corresponding to the user-set temperature is > 0, indicating that the passenger compartment needs to be cooled at this time;
[0060] Calculate the interior temperature in the car - the target interior temperature corresponding to the user-set temperature is less than 0, which means that the passenger compartment needs to be heated at this time;
[0061] Calculated vehicle interior temperature - Target vehicle interior temperature corresponding to the user-set temperature = 0°C, which means that the compressor is running at a small displacement to maintain the current power.
[0062] For example: When the passenger compartment needs to be cooled, the power of the air conditioner is calculated by air volume*specific heat*(front evaporator intake temperature-front evaporator target temperature).
[0063] The thermal demand of the battery is determined as follows:
[0064] Battery Cooling:
[0065] Level 1 (self-circulation): The battery temperature is 25-32°C, and the coolant is driven by the battery circuit water pump for passive cooling;
[0066] Level 2 (low priority cooling): Battery temperature is 32-40°C. The refrigerant and coolant flowing through the plate heat exchanger (°Chiller) exchange heat. The refrigerant absorbs heat from the coolant for active cooling. The cooling capacity is allocated to the passenger compartment first.
[0067] Level 3 (medium priority cooling): Battery temperature 40-45°C, maintain active cooling at level 2, and request passenger compartment cooling to be downgraded, with cooling capacity still prioritized for the passenger compartment;
[0068] Level 4 (high priority cooling): Battery temperature > 45°C, maintain active cooling at level 2, with cooling capacity allocated to the battery first.
[0069] For example: when the battery temperature is 25°C, only the battery circuit water pump is turned on to drive the coolant to achieve the battery's uniform temperature requirement.
[0070] Battery heating:
[0071] Level 1 (self-circulation): The battery temperature is 5-25°C, and the coolant is driven by the battery circuit water pump for self-circulation heating;
[0072] Level 2 (low priority heating): Battery temperature -15 to 5°C, heated by high-voltage electric heater, heat transferred to the battery through a four-way valve, heating is allocated to the passenger compartment first;
[0073] Level 3 (medium priority heating): Battery temperature -27 to -15°C, maintain active heating at level 2, and request passenger compartment heating to be degraded, with the passenger compartment still given priority.
[0074] Level 4 (high priority heating): Battery temperature -27 to -35°C, maintain active heating at level 2, and the heating capacity is allocated to the battery first.
[0075] For example: when the battery temperature is -10°C and the high-voltage electric heating is turned on, the water heated in the passenger compartment circuit transfers heat to the battery through the four-way valve. When the battery temperature is heated to above 5°C, the high-voltage electric heating is turned off and self-circulation is carried out through the battery circuit water pump.
[0076] The thermal demand of the motor is determined as follows:
[0077] Normally, the motor only needs cooling, not heating. Therefore, only the motor cooling is introduced:
[0078] Level 1 (self-circulation): The motor inlet water temperature is less than 65°C, and the coolant is driven by the motor circuit water pump for self-circulation;
[0079] Level 2 (low priority cooling): The motor inlet water temperature is 65℃~70℃. The refrigerant and coolant flowing through the plate heat exchanger (℃hiller) exchange heat. The refrigerant absorbs the heat in the coolant for active cooling and transfers the cold to the motor through the six-way valve (mixed water).
[0080] Level 3 (medium priority cooling): The motor inlet water temperature is 73℃~80℃, and the active cooling of level 2 is maintained. At the same time, the cooling level of the passenger compartment is requested to be downgraded, and the cooling capacity is still allocated to the passenger compartment first.
[0081] Level 4 (high priority heating): Motor inlet water temperature > 80°C, maintain active cooling at level 2, and the cooling capacity is allocated to the motor first.
[0082] For example: the motor temperature is 75℃ and the battery temperature is 50℃. At this time, thermal runaway may have occurred. The battery has a higher priority than the motor, and the high-priority cooling of the battery is given priority, so the cooling capacity is allocated to the battery first.
[0083] When a target object with thermal demand appears in the preset objects, the medium in the refrigerant circuit or the coolant circuit is controlled by the thermal domain controller to flow through the target object to meet the thermal demand of the target object, wherein the thermal domain controller is used to control the refrigerant circuit and the coolant circuit to meet the reduction of thermal demand of all preset objects.
[0084] In addition, it should be noted that in the above cooling or heating scenario examples, when the battery cooling level is greater than or equal to level 2, the compressor will intervene to assist in cooling the battery. At the same time, when the battery heating level is greater than or equal to level 2, the compressor will intervene to assist in heating the battery. Similarly, when the motor cooling level is greater than or equal to level 2, the compressor will intervene to assist in cooling the motor.
[0085] Specifically, the initial entry condition of the motor LTR (Low temperature radiator) cooling sub-mode: passive cooling at this time, the air conditioning compressor does not intervene, based on the initial motor mode request, battery mode request, fault status and other comprehensive judgments, the initial entry condition of the motor LTR cooling sub-mode is output, that is, when the following conditions A||B||C (take or, if any one is met), the initial condition of the motor LTR cooling sub-mode is met. When none of the following conditions are met, the initial condition is not met.
[0086] A: When the initial motor mode request level ≠ 2||3||4, condition A is met;
[0087] B: The request level corresponding to the battery mode (not greater than 4) ≥ the initial motor mode request level, condition B is met;
[0088] C: When the air conditioning system fails, condition C is met.
[0089] The motor LTR cooling sub-mode enters the Chiller (plate / tube heat exchanger) cooling sub-mode switching conditions: active cooling at this time, the air conditioning compressor intervenes.
[0090] Based on comprehensive judgments such as the initial motor mode request, battery mode request, and fault status, the output motor LTR cooling sub-mode enters the Chiller cooling sub-mode switching condition, that is, when the following conditions A&B&C are established (take AND, if all are satisfied, then it is satisfied), the switching condition is met.
[0091] If any of the following conditions is not met, the switching condition is not satisfied.
[0092] A: When the initial motor mode request level = 2||3||4, condition A is met;
[0093] B: Battery mode request level (not greater than 4) < initial motor mode request level, condition B is met;
[0094] C: When the air conditioning system has no faults, condition C is met.
[0095] Among them, Chiller (plate / tube heat exchanger) includes a casing with two fluids inside. Taking battery cooling as an example, the casing exchanges heat between high-temperature water and low-temperature refrigerant, the water temperature is reduced, and the water circulates in the water circuit through a water pump, thereby reducing the temperature of the battery and electronic control components.
[0096] The beneficial effect of the present application is that the refrigerant circuit or the coolant circuit can be controlled by the thermal domain controller to flow through the target object, thereby meeting the thermal requirements of all preset objects that need heating or cooling. Compared with the distributed control strategy, the present application can uniformly meet the thermal requirements of all preset objects that need heating or cooling through the thermal domain controller, thereby reducing the computational cost of thermal management and improving the thermal management efficiency.
[0097] In one embodiment, the above step S102 may be implemented as the following steps A1-A3:
[0098] In step A1, when the preset object is a passenger compartment, the heat demand of the preset object is determined according to a comparison result between the temperature of the passenger compartment and the temperature set by the user;
[0099] In step A2, when the preset object is a battery, the thermal demand of the battery is determined according to the current temperature of the battery and a preset temperature and thermal demand correspondence table;
[0100] In step A3, when the preset object is a motor, it is determined whether the motor needs cooling according to the current temperature of the motor and the correspondence between the preset temperature and the cooling level.
[0101] The preset objects may be the passenger compartment, battery, and motor. The cooling and heating requirements of the passenger compartment, battery, and motor may be determined in the following ways:
[0102] The thermal demand of the passenger compartment is determined as follows:
[0103] Calculate the interior temperature in the car - the target interior temperature corresponding to the user-set temperature is > 0, indicating that the passenger compartment needs to be cooled at this time;
[0104] Calculate the interior temperature in the car - the target interior temperature corresponding to the user-set temperature is less than 0, which means that the passenger compartment needs to be heated at this time;
[0105] Calculated vehicle interior temperature - Target vehicle interior temperature corresponding to the user-set temperature = 0°C, which means that the compressor is running at a small displacement to maintain the current power.
[0106] For example: When the passenger compartment needs to be cooled, the power of the air conditioner is calculated by air volume*specific heat*(front evaporator intake temperature-front evaporator target temperature).
[0107] The thermal demand of the battery is determined as follows:
[0108] Battery Cooling:
[0109] Level 1 (self-circulation): The battery temperature is 25-32°C, and the coolant is driven by the battery circuit water pump for passive cooling;
[0110] Level 2 (low priority cooling): Battery temperature is 32-40°C. The refrigerant and coolant flowing through the plate heat exchanger (°Chiller) exchange heat. The refrigerant absorbs heat from the coolant for active cooling. The cooling capacity is allocated to the passenger compartment first.
[0111] Level 3 (medium priority cooling): Battery temperature 40-45°C, maintain active cooling at level 2, and request passenger compartment cooling to be downgraded, with cooling capacity still prioritized for the passenger compartment;
[0112] Level 4 (high priority cooling): Battery temperature > 45°C, maintain active cooling at level 2, with cooling capacity allocated to the battery first.
[0113] For example: when the battery temperature is 25°C, only the battery circuit water pump is turned on to drive the coolant to achieve the battery's uniform temperature requirement.
[0114] Battery heating:
[0115] Level 1 (self-circulation): The battery temperature is 5-25°C, and the coolant is driven by the battery circuit water pump for self-circulation heating;
[0116] Level 2 (low priority heating): Battery temperature -15 to 5°C, heated by high-voltage electric heater, heat transferred to the battery through a four-way valve, heating is allocated to the passenger compartment first;
[0117] Level 3 (medium priority heating): Battery temperature -27 to -15°C, maintain active heating at level 2, and request passenger compartment heating to be degraded, with the passenger compartment still given priority.
[0118] Level 4 (high priority heating): Battery temperature -27 to -35°C, maintain active heating at level 2, and the heating capacity is allocated to the battery first.
[0119] For example: when the battery temperature is -10°C and the high-voltage electric heating is turned on, the water heated in the passenger compartment circuit transfers heat to the battery through the four-way valve. When the battery temperature is heated to above 5°C, the high-voltage electric heating is turned off and self-circulation is carried out through the battery circuit water pump.
[0120] The thermal demand of the motor is determined as follows:
[0121] Normally, the motor only needs cooling, not heating. Therefore, only the motor cooling is introduced:
[0122] Level 1 (self-circulation): The motor inlet water temperature is less than 65°C, and the coolant is driven by the motor circuit water pump for self-circulation;
[0123] Level 2 (low priority cooling): The motor inlet water temperature is 65℃~70℃. The refrigerant and coolant flowing through the plate heat exchanger (℃hiller) exchange heat. The refrigerant absorbs the heat in the coolant for active cooling and transfers the cold to the motor through the six-way valve (mixed water).
[0124] Level 3 (medium priority cooling): The motor inlet water temperature is 73℃~80℃, and the active cooling of level 2 is maintained. At the same time, the cooling level of the passenger compartment is requested to be downgraded, and the cooling capacity is still allocated to the passenger compartment first.
[0125] Level 4 (high priority heating): Motor inlet water temperature > 80°C, maintain active cooling at level 2, and the cooling capacity is allocated to the motor first.
[0126] For example: the motor temperature is 75℃ and the battery temperature is 50℃. At this time, thermal runaway may have occurred. The battery has a higher priority than the motor, and the high-priority cooling of the battery is given priority, so the cooling capacity is allocated to the battery first.
[0127] In one embodiment, when the target object is a passenger compartment and the thermal demand is a heating demand, the above step S103 of controlling the medium in the refrigerant circuit or the coolant circuit to flow through the target object by the thermal domain controller to meet the thermal demand of the target object can be implemented as the following steps B1-B3:
[0128] In step B1, the thermal domain controller determines whether there is waste heat in the battery circuit or the motor circuit;
[0129] In step B2, when there is waste heat in the battery circuit or the motor circuit, the waste heat in the battery circuit or the motor circuit is recovered to the refrigerant circuit through the coolant circuit by the thermal domain controller;
[0130] In step B3, the plate heat exchanger is controlled by a heat domain controller to transfer the waste heat to the passenger compartment circuit, so as to heat the passenger compartment circuit.
[0131] In this embodiment, when the thermal domain controller determines whether there is waste heat in the battery circuit, the battery temperature can be obtained. When the battery temperature is in the first temperature range, that is, the battery temperature in the above battery heating example is 5 to 25°C, since the battery is only driven by the battery circuit water pump to self-circulate the coolant for heating, it can be assumed that there is no waste heat in the battery circuit. If the battery temperature is in the second temperature range, that is, the battery temperature is -15 to 5°C, since the battery is heated by the high-voltage electric heater, but the battery temperature is not particularly low, it means that there is waste heat in the battery circuit, so the waste heat can be transferred to the battery. At this time, the waste heat is transferred to the battery through the four-way valve, and the waste heat is preferentially allocated to the passenger compartment. If the battery temperature is in the third temperature range, that is, the battery temperature is -27 to -15°C, since the battery is heated by the high-voltage electric heater, it means that there is waste heat in the battery circuit, so the waste heat can be transferred to the battery, but since the battery temperature is low, the priority of passenger compartment heating is downgraded, and the waste heat is still preferentially allocated to the passenger compartment, but the allocation amount is less than the allocation amount when the battery temperature is in the second temperature range. If the battery temperature is in the fourth temperature range, that is, the battery temperature is -27 to -35°C, although the battery is still heated by the high-voltage electric heater, -27°C is already the critical temperature for extremely cold conditions. Therefore, it can be considered that there is no waste heat in the battery circuit at this time, and all heating capacity needs to be allocated to the battery first.
[0132] When the waste heat in the battery circuit is distributed to the passenger compartment, the waste heat in the battery circuit or the motor circuit can be recovered to the refrigerant circuit through the coolant circuit by the thermal domain controller; the waste heat is transferred to the passenger compartment circuit by controlling the plate heat exchanger through the thermal domain controller to achieve heating of the passenger compartment circuit.
[0133] Motors usually do not have a heating demand, so the reason why the motor circuit generates waste heat is usually due to the operation of the motor itself. Therefore, whether the motor has waste heat can be determined simply by judging the motor temperature.
[0134] The beneficial effect of this embodiment is that when there is waste heat in the battery circuit or the motor circuit, the waste heat in the battery circuit or the motor circuit is recovered to the refrigerant circuit through the coolant circuit by the thermal domain controller; the plate heat exchanger is controlled by the thermal domain controller to transfer the waste heat to the passenger compartment circuit to achieve heating of the passenger compartment circuit, thereby meeting the heating needs of at least part of the passenger compartment without the need for air conditioning for heating, thereby reducing heating costs.
[0135] In one embodiment, the method can also be implemented as the following steps C1-C2:
[0136] In step C1, when the plate heat exchanger is controlled by the thermal domain controller to transfer the waste heat to the passenger compartment circuit, it is determined whether the waste heat meets the heating demand of the passenger compartment;
[0137] In step C2, when the waste heat cannot meet the heating demand of the passenger compartment, the electric compressor is controlled by the thermal domain controller to perform auxiliary heating on the passenger compartment.
[0138] The beneficial effect of this embodiment is that when waste heat cannot meet the heating demand of the passenger compartment, the electric compressor can be controlled by the thermal domain controller to perform auxiliary heating on the passenger compartment, thereby meeting the heating demand of the passenger compartment while reducing the heating cost.
[0139] In one embodiment, the method can also be implemented as the following steps:
[0140] When there is no waste heat in the battery circuit or the motor circuit, the electric compressor is controlled by the thermal domain controller to heat the passenger compartment.
[0141] In one embodiment, when the target object is a battery and the thermal demand is a heating demand, the step S103 of controlling the medium in the refrigerant circuit or the coolant circuit to flow through the target object by the thermal domain controller to meet the thermal demand of the target object can be implemented as the following steps D1-D3:
[0142] In step D1, obtaining the temperature of the battery;
[0143] In step D2, when the battery temperature is within the temperature range of the normal heating condition, the battery circuit water pump drives the coolant to self-circulate and heat the battery;
[0144] In step D3, when the temperature of the battery is lower than the critical temperature corresponding to the extremely cold working condition, the high-voltage electric heater is controlled by the thermal domain controller to heat the battery, and the heating amount is preferentially allocated to the battery.
[0145] In this embodiment, when the battery temperature is in the temperature range of normal heating conditions, the battery circuit water pump drives the coolant to self-circulate and heat the battery; when the battery temperature is lower than the critical temperature corresponding to the extremely cold condition, the thermal domain controller controls the high-voltage electric heater to heat the battery, and the heating capacity is preferentially allocated to the battery. Continuing with the above battery heating example: when the battery temperature is in the temperature range of normal heating conditions, the battery circuit water pump drives the coolant to self-circulate and heat the battery; that is, when the battery temperature in the above battery heating example is 5 to 25°C, the battery only drives the coolant to self-circulate and heat the battery through the battery circuit water pump. When the battery temperature is -27 to -35°C, -27°C is already the critical temperature for extremely cold conditions. Therefore, the thermal domain controller controls the high-voltage electric heater to heat the battery, and the heating capacity is preferentially allocated to the battery.
[0146] In this embodiment, the battery circuit water pump drives the coolant to self-circulate and heat the battery, which can be implemented as follows:
[0147] The water circuit heating module in the passenger compartment circuit is controlled by the thermal domain controller to heat the coolant in the coolant circuit; the passenger compartment circuit water pump is controlled by the thermal domain controller to pump the heated coolant into the battery circuit water pump; the battery circuit water pump is controlled by the thermal domain controller to pump the heated coolant into the battery circuit to achieve battery heating.
[0148] The beneficial effects of this embodiment are as follows: under extremely cold conditions, since the evaporating temperature, intake air density and refrigerant mass flow rate are all low, excessive air-conditioning compressor speed will cause liquid in the intake air, and the exhaust temperature of the compressor will also be too high. Therefore, under extremely cold conditions, the high-voltage electric heater is controlled by the thermal domain controller to heat the battery, and the heating amount is allocated to the battery first, thereby avoiding the problem of liquid in the intake air and excessive exhaust temperature caused by excessive air-conditioning compressor speed, thereby improving the safety of thermal management.
[0149] In one embodiment, when the target objects are a battery and a passenger compartment, and the thermal requirements of the battery and the passenger compartment are the same, the above step S103 of controlling the medium in the refrigerant circuit or the coolant circuit to flow through the target object by the thermal domain controller to meet the thermal requirements of the target object can be implemented as the following steps E1-E2:
[0150] In step E1, a four-way valve connecting the battery and the passenger compartment is controlled to open by a thermal domain controller so that the battery and the passenger compartment are connected;
[0151] In step E2, the plate heat exchanger is controlled by the thermal domain controller to heat or cool the connected battery and passenger compartment, so as to meet the thermal requirements of the battery and the passenger compartment at the same time.
[0152] The beneficial effect of this embodiment is that when the target objects are the battery and the passenger compartment, and the thermal requirements of the battery and the passenger compartment are the same, the battery and the passenger compartment can be connected by controlling the thermal domain controller, so that the plate heat exchanger can heat or cool the connecting area between the battery and the passenger compartment to meet the thermal requirements of the battery and the passenger compartment at the same time, without the need to heat or cool the two separately, further reducing the cost of thermal management.
[0153] In one embodiment, the above step S103 of controlling the medium in the refrigerant circuit or the coolant circuit to flow through the target object by the thermal domain controller to meet the thermal demand of the target object can be implemented as the following steps, including:
[0154] Controlling the six-way valve connecting the battery and the motor to open through a thermal domain controller so that the battery and the motor are connected;
[0155] The coolant is controlled by a thermal domain controller to heat or cool the connected battery and motor to meet the thermal requirements of the battery and motor at the same time.
[0156] The beneficial effect of this embodiment is that when the target objects are batteries and motors, and the thermal demands of the batteries and motors are both cooling demands, the coolant is controlled by the thermal domain controller to heat or cool the connected batteries and motors, so as to simultaneously meet the thermal demands of the batteries and motors without the need to cool them separately, thereby further reducing the cost of thermal management.
[0157] Figure 2 This is a schematic diagram of the structure of a vehicle thermal management system of the present application, which is used in the vehicle thermal management method described in any one of the above embodiments, including:
[0158] A thermal domain controller, which is used to connect to the refrigerant circuit and the coolant circuit respectively, and to control the flow direction of the medium in the refrigerant circuit and the coolant circuit to meet the thermal demand of all preset objects, wherein the preset objects are objects in the vehicle that need to be heated or cooled;
[0159] The refrigerant circuit is connected to each air conditioning module in the vehicle;
[0160] The coolant circuit is connected to various preset objects in the car.
[0161] In this embodiment, the preset objects may be a battery, a passenger compartment, a motor, and the air conditioning module may include Figure 2 The electric compressor, air heater, front evaporator, rear evaporator and other modules.
[0162] In one embodiment, the thermal management system further comprises:
[0163] A four-way valve is used to connect the battery and the passenger compartment in the preset object, and when the battery and the passenger compartment have the same heat demand, the battery and the passenger compartment are connected so that the plate heat exchanger deflates to meet the heat demand of the battery and the passenger compartment;
[0164] The six-way valve is used to connect the battery and the motor in the preset object. When the battery and the motor have the same thermal requirements, the battery and the motor are connected so that the plate heat exchanger deflates to meet the thermal requirements of the battery and the motor.
[0165] Those skilled in the art will appreciate that the embodiments of the present application may be provided as methods, systems, or computer program products. Therefore, the present application may adopt the form of a complete hardware embodiment, a complete software embodiment, or an embodiment in combination with software and hardware. Moreover, the present application may adopt the form of a computer program product implemented on one or more computer-usable storage media (including but not limited to disk storage and optical storage, etc.) that contain computer-usable program code.
[0166] The present application is described with reference to the flowcharts and / or block diagrams of the methods, devices (systems), and computer program products according to the embodiments of the present application. It should be understood that each process and / or box in the flowchart and / or block diagram, as well as the combination of the processes and / or boxes in the flowchart and / or block diagram, can be implemented by computer program instructions. These computer program instructions can be provided to a processor of a general-purpose computer, a special-purpose computer, an embedded processor, or other programmable data processing device to generate a machine, so that the instructions executed by the processor of the computer or other programmable data processing device generate instructions for implementing the processes in the flowchart and / or block diagram. Figure 1 A process or multiple processes and / or boxes Figure 1 A device that provides the functions specified in a block or multiple blocks.
[0167] These computer program instructions may also be stored in a computer-readable memory capable of directing a computer or other programmable data processing device to operate in a specific manner, so that the instructions stored in the computer-readable memory produce an article of manufacture comprising an instruction device, which implements the process Figure 1 A process or multiple processes and / or boxes Figure 1 A function specified in one or more boxes.
[0168] These computer program instructions can also be loaded onto a computer or other programmable data processing device so that a series of operating steps are executed on the computer or other programmable device to produce a computer-implemented process, thereby providing instructions for implementing the process. Figure 1 A process or multiple processes and / or boxes Figure 1 A step that specifies a function in one or more boxes.
[0169] Obviously, those skilled in the art can make various changes and modifications to the present application without departing from the spirit and scope of the present application. Thus, if these modifications and variations of the present application fall within the scope of the claims of the present application and their equivalents, the present application is also intended to include these modifications and variations.
Claims
1. A vehicle thermal management method, characterized in that: include: During the operation of the vehicle, a temperature parameter of a preset object is obtained, where the preset object is an object in the vehicle that needs to be heated or cooled; Determining the heat demand of the preset object according to the temperature parameters of the preset object; When a target object with thermal demand appears in the preset objects, the medium in the refrigerant circuit or the coolant circuit is controlled by the thermal domain controller to flow through the target object to meet the thermal demand of the target object, wherein the thermal domain controller is used to control the refrigerant circuit and the coolant circuit to meet the thermal demand of all preset objects.
2. The method according to claim 1, characterized in that Determining the heat demand of the preset object according to the temperature parameter of the preset object includes: When the preset object is a passenger cabin, determining the heat demand of the preset object according to a comparison result between the temperature of the passenger cabin and the temperature set by the user; When the preset object is a battery, the thermal demand of the battery is determined according to the current temperature of the battery and a preset temperature and thermal demand correspondence table; When the preset object is a motor, whether the motor needs cooling is determined according to the current temperature of the motor and the correspondence between the preset temperature and the cooling level.
3. The method according to claim 1, characterized in that When the target object is a passenger compartment and the thermal demand is a heating demand, controlling the medium in the refrigerant circuit or the coolant circuit to flow through the target object through the thermal domain controller to meet the thermal demand of the target object includes: Determine whether there is waste heat in the battery circuit or motor circuit through the thermal domain controller; When there is waste heat in the battery circuit or the motor circuit, the waste heat in the battery circuit or the motor circuit is recovered to the refrigerant circuit through the coolant circuit by the thermal domain controller; The plate heat exchanger is controlled by a heat domain controller to transfer the waste heat to the passenger compartment circuit, so as to heat the passenger compartment circuit.
4. The method according to claim 3, characterized in that The method further comprises: When the plate heat exchanger is controlled by the thermal domain controller to transfer the waste heat to the passenger compartment circuit, determining whether the waste heat meets the heating demand of the passenger compartment; When the waste heat cannot meet the heating demand of the passenger compartment, the electric compressor is controlled by the thermal domain controller to perform auxiliary heating on the passenger compartment.
5. The method according to claim 3, characterized in that The method further comprises: When there is no waste heat in the battery circuit or the motor circuit, the electric compressor is controlled by the thermal domain controller to heat the passenger compartment.
6. The method according to claim 1, characterized in that When the target object is a battery and the thermal demand is a heating demand, controlling the medium in the refrigerant circuit or the coolant circuit to flow through the target object through the thermal domain controller to meet the thermal demand of the target object includes: obtaining a temperature of the battery; When the battery temperature is within the temperature range of normal heating conditions, the battery circuit water pump drives the coolant to self-circulate and heat the battery; When the temperature of the battery is lower than the critical temperature corresponding to the extremely cold working condition, the high-voltage electric heater is controlled by the thermal domain controller to heat the battery, and the heating amount is preferentially allocated to the battery.
7. The method according to claim 1, characterized in that When the target objects are a battery and a passenger compartment, and the thermal requirements of the battery and the passenger compartment are the same, controlling the medium in the refrigerant circuit or the coolant circuit to flow through the target object through the thermal domain controller to meet the thermal requirements of the target object includes: Controlling the four-way valve connecting the battery and the passenger compartment to open through a thermal domain controller so that the battery and the passenger compartment are in communication; The plate heat exchanger is controlled by a thermal domain controller to heat or cool the connected battery and passenger compartment, so as to meet the thermal requirements of the battery and the passenger compartment at the same time.
8. The method according to claim 1, characterized in that When the target object is a battery and a motor, and the thermal demands of the battery and the motor are both cooling demands, controlling the medium in the refrigerant circuit or the coolant circuit to flow through the target object through the thermal domain controller to meet the thermal demands of the target object includes: Controlling the six-way valve connecting the battery and the motor to open through a thermal domain controller so that the battery and the motor are connected; The coolant is controlled by a thermal domain controller to heat or cool the connected battery and motor to meet the thermal requirements of the battery and motor at the same time.
9. A vehicle thermal management system, used in the vehicle thermal management method according to any one of claims 1 to 8, characterized in that: include: A thermal domain controller, which is used to connect to the refrigerant circuit and the coolant circuit respectively, and to control the flow direction of the medium in the refrigerant circuit and the coolant circuit to meet the thermal demand of all preset objects, wherein the preset objects are objects in the vehicle that need to be heated or cooled; The refrigerant circuit is connected to each air conditioning module in the vehicle; The coolant circuit is connected to various preset objects in the vehicle.
10. The thermal management system according to claim 9, characterized in that: The thermal management system further comprises: A four-way valve is used to connect the battery and the passenger compartment in the preset object, and when the battery and the passenger compartment have the same heat demand, the battery and the passenger compartment are connected so that the plate heat exchanger deflates to meet the heat demand of the battery and the passenger compartment; The six-way valve is used to connect the battery and the motor in the preset object. When the battery and the motor have the same thermal requirements, the battery and the motor are connected so that the plate heat exchanger deflates to meet the thermal requirements of the battery and the motor.