Control method, device, system and new energy vehicle for thermal management system

Abstract

The present application provides a control method, device, system, and new energy vehicle for a thermal management system. The thermal management system includes a first, second, and third circuits and a coolant circulation pump. The control method includes: when the thermal management system is in operation, obtaining the ambient temperature of each circuit and a preset optimal operating temperature range; when the ambient temperature of any circuit is outside the preset optimal operating temperature range, determining a first opening of a first three-way proportional valve based on the first ambient temperature of the first circuit to adjust a first flow rate flowing into the first circuit; determining a second opening of a second three-way proportional valve based on the first and second temperature differences between the first and second circuits to adjust a second flow rate flowing into the second circuit; determining a first target speed of the coolant circulation pump based on the ambient temperature of each circuit to adjust the total flow rate flowing into the first three-way proportional valve; and adjusting the ambient temperature of each circuit based on the total flow rate, the first flow rate, and the second flow rate.

Description

Technical Field

[0001] The present application relates to the field of new energy technology, and specifically to a control method and device for a thermal management system, a thermal management system, a new energy vehicle, and a storage medium. Background Art

[0002] With the development of new energy, the application of battery electrical thermal management systems is becoming increasingly widespread. Precisely controlling the varying temperatures of multiple electrical devices within a confined space is becoming increasingly important. This involves multiple technical areas, including thermal management, electrical control, energy efficiency, and environmental protection. Therefore, achieving this goal efficiently and accurately has become a significant technical challenge.

[0003] Currently, in the new energy vehicle sector, temperature control for multiple spaces typically relies on a one-to-one approach, where one cooling device controls the temperature of each space. Alternatively, a fixed cooling power is used to independently adjust the temperature of each ambient environment. This approach not only increases energy consumption but also requires more space due to the increased number of components. This also increases the failure rate of the thermal management system. Summary of the Invention

[0004] The purpose of the embodiments of the present application is to provide a control method, device, thermal management system, new energy vehicle and storage medium for a thermal management system, so as to solve the technical defects of the prior art such as high energy consumption and large installation space caused by the large number of thermal management system components.

[0005] To achieve the above objectives, the present application provides, in a first aspect, a control method for a thermal management system. The thermal management system includes a first circuit, a second circuit, a third circuit, and a coolant circulation pump. The coolant circulation pump is connected to a first three-way proportional valve. The first circuit is connected to the second three-way proportional valve via the first three-way proportional valve. The second circuit is connected to the third circuit via the second three-way proportional valve. The control method includes:

[0006] When the thermal management system is in operation, obtain the ambient temperature of each circuit and the preset optimal operating temperature range;

[0007] When the ambient temperature of any one circuit is outside the preset optimal operating temperature range, determining a first opening of the first three-way proportional valve based on the first ambient temperature of the first circuit to adjust a first flow rate flowing into the first circuit;

[0008] determining a second opening of the second three-way proportional valve based on a first temperature difference of the first circuit and a second temperature difference of the second circuit to adjust a second flow rate flowing into the second circuit, wherein the temperature difference refers to a difference between an ambient temperature of the circuit and a preset optimal operating temperature range of the circuit;

[0009] determining a first target speed of the coolant circulation pump based on the ambient temperature of each circuit, and adjusting the speed of the coolant circulation pump to the first target speed to regulate the total flow into the first three-way proportional valve;

[0010] The ambient temperature of each circuit is adjusted based on the total flow rate, the first flow rate, and the second flow rate, so that the ambient temperature of each circuit is within the corresponding preset optimal operating temperature range.

[0011] In an embodiment of the present application, for each circuit, multiple temperature intervals are set for the ambient temperature of each circuit, and the multiple temperature intervals include at least a first temperature interval, a second temperature interval, a third temperature interval and a fourth temperature interval, wherein the upper limit value of the first temperature interval is lower than the lower limit value of the second temperature interval, the upper limit value of the second temperature interval is lower than the lower limit value of the third temperature interval, and the upper limit value of the third temperature interval is lower than the lower limit value of the fourth temperature interval, and the preset optimal operating temperature interval of each circuit is included in the second temperature interval. The control method also includes: determining the first target speed of the coolant circulation pump based on the temperature interval in which the current ambient temperature of each circuit is located.

[0012] In an embodiment of the present application, determining the first target speed of the coolant circulation pump based on the temperature range in which the current ambient temperature of each circuit is located includes: obtaining the current speed, the first power speed regulation cycle and the first temperature speed regulation cycle of the coolant circulation pump; when the ambient temperatures of all circuits are not lower than the lower limit value of the second temperature range corresponding to each circuit and the ambient temperature of any circuit is in the second temperature range corresponding to the circuit, determining the first target speed adjustment coefficient of the coolant circulation pump based on the current power of the coolant circulation pump and the compressor; determining the first ambient temperature speed adjustment coefficient of the coolant circulation pump based on the temperature difference of all circuits; determining the first target speed of the coolant circulation pump according to the current speed, the first power speed regulation cycle, the first temperature speed regulation cycle, the first target speed adjustment coefficient and the first ambient temperature speed regulation coefficient of the coolant circulation pump.

[0013] In an embodiment of the present application, the first target speed of the coolant circulation pump is determined according to formula (1):

[0014] N n =N o -Δ1 n *t1 n +Δ2 n *t2 n (1),

[0015] Among them, N n is the first target speed of the coolant circulation pump, N o is the current speed of the coolant circulation pump, Δ1 n is the first target speed adjustment coefficient, t1n is the first power speed regulation cycle, Δ2 n is the first ambient temperature speed regulation coefficient, t2 n This is the first temperature regulation cycle.

[0016] In an embodiment of the present application, the thermal management system also includes a compressor, and determining the first target speed of the coolant circulation pump based on the temperature range in which the current ambient temperature of each circuit is located includes: when the ambient temperature of all circuits is higher than the upper limit value of the second temperature range corresponding to each circuit, or when the ambient temperature of all circuits is not lower than the lower limit value of the second temperature range corresponding to each circuit and the ambient temperature of any circuit is in the fourth temperature range corresponding to the circuit, the preset maximum speed of the coolant circulation pump is determined as the first target speed of the coolant circulation pump; when the ambient temperature of all circuits is in the second temperature range corresponding to each circuit and the current speed of the coolant circulation pump is less than the preset minimum speed of the coolant circulation pump, the preset minimum speed of the coolant circulation pump is determined as the first target speed of the coolant circulation pump; when the ambient temperature of any circuit is lower than the lower limit value of the second temperature range corresponding to the circuit and the current speed of the compressor is zero, the first target speed of the coolant circulation pump is determined to be zero.

[0017] In an embodiment of the present application, the thermal management system also includes a compressor circuit and a heat dissipation device connected to a coolant circulation pump. The compressor circuit includes a compressor, a heat exchange device connected to the compressor, a condensing device and a gas-liquid separation device. The compressor circuit is connected to the coolant circulation circuit through the heat exchange device. The coolant circulation circuit includes a heat dissipation device, a coolant circulation pump and a first three-way proportional valve connected in sequence. The control method also includes: determining the second target speed of the compressor based on the temperature range in which the current ambient temperature of each circuit is located, and adjusting the speed of the compressor to the second target speed to adjust the flow delivery speed of the circuit where the compressor is located; adjusting the heat exchange speed of the heat exchange device based on the flow delivery speed, so that the flow flowing into the compressor is cooled by the condensing device and then flows into the heat exchange device and exchanges heat with the total flow flowing into the first three-way proportional valve through the coolant circulation pump.

[0018] In an embodiment of the present application, determining the second target speed of the compressor based on the temperature range in which the current ambient temperature of each circuit is located includes: obtaining the current speed of the compressor, the second power speed regulation cycle, and the second temperature speed regulation cycle; when the ambient temperatures of all circuits are not lower than the lower limit value of the second temperature range corresponding to each circuit and the ambient temperature of any circuit is in the second temperature range corresponding to the circuit, determining the second target speed adjustment coefficient of the compressor based on the power of the coolant circulation pump and the compressor; determining the second ambient temperature speed adjustment coefficient of the compressor based on the temperature difference of all circuits; and determining the second target speed of the compressor according to the second target speed adjustment coefficient, the second ambient temperature speed adjustment coefficient, and the current speed of the compressor.

[0019] In an embodiment of the present application, the second target speed of the compressor is determined according to formula (2):

[0020] M=M o -Δ1 n *t1 n +Δ2 n *t2 n (2),

[0021] Wherein, M is the second target speed of the compressor, M o is the current speed of the compressor, Δ1 n is the second target speed adjustment coefficient, t1 n is the second power speed regulation cycle, Δ2 n is the second ambient temperature speed control coefficient, t2 n This is the second temperature regulation cycle.

[0022] In an embodiment of the present application, determining the second target speed of the compressor based on the temperature range in which the current ambient temperature of each circuit is located includes: when the ambient temperatures of all circuits are higher than the upper limit value of the second temperature range corresponding to each circuit, or when the ambient temperatures of all circuits are not lower than the lower limit value of the second temperature range corresponding to each circuit and the ambient temperature of any circuit is in the fourth temperature range corresponding to the circuit, the preset maximum speed of the compressor is determined as the second target speed of the compressor; when the differences between the second ambient temperature of the second circuit and the third ambient temperature of the third circuit and the lower limit value of the second temperature range corresponding to each circuit are both within a preset range and the current speed of the compressor is less than the preset minimum speed of the compressor, the second target speed of the compressor is determined to be zero.

[0023] In an embodiment of the present application, determining the second opening of the second three-way proportional valve based on the first temperature difference of the first circuit and the second temperature difference of the second circuit includes: obtaining the current valve opening and the opening adjustment coefficient of the second three-way proportional valve; determining the temperature difference adjustment coefficient of the second three-way proportional valve based on the first temperature difference of the first circuit and the second temperature difference of the second circuit, and determining the opening adjustment period of the second three-way proportional valve based on the second temperature difference of the second circuit; determining the second opening of the second three-way proportional valve based on the current valve opening, opening adjustment coefficient, temperature difference adjustment coefficient and opening adjustment period of the second three-way proportional valve.

[0024] In the embodiment of the present application, the second opening of the second three-way proportional valve is determined according to formula (3):

[0025] θ2 n =θ2 o +k2*Δ2 k *t2 (3),

[0026] Among them, θ2 n is the second opening of the second three-way proportional valve, θ2 o is the current valve opening of the second three-way proportional valve, k2 is the opening adjustment coefficient, Δ2 k is the temperature difference adjustment coefficient, and t2 is the opening adjustment cycle.

[0027] A second aspect of the present application provides a control device for a thermal management system, comprising:

[0028] a memory configured to store instructions;

[0029] The controller is configured to call the instructions from the memory and implement the above-mentioned control method for the thermal management system when executing the instructions.

[0030] A third aspect of the present application provides a thermal management system, comprising:

[0031] a coolant circulation pump connected to the first three-way proportional valve, the coolant circulation pump being used to adjust a total flow into the first three-way proportional valve;

[0032] The first circuit, the second circuit and the third circuit, the first circuit is connected to the second three-way proportional valve through the first three-way proportional valve, the second circuit is connected to the third circuit through the second three-way proportional valve, the first three-way proportional valve is used to adjust the first flow flowing into the first circuit, and the second three-way proportional valve is used to adjust the second flow flowing into the second circuit.

[0033] In an embodiment of the present application, the thermal management system further includes:

[0034] A heat dissipation device connected to a coolant circulation pump;

[0035] The compressor circuit includes a compressor, a heat exchange device connected to the compressor, a condensing device, and a gas-liquid separation device. The compressor circuit is connected to the coolant circulation circuit through the heat exchange device. The coolant circulation circuit includes a one-way valve, a heat dissipation device, a coolant circulation pump, and a first three-way proportional valve connected in sequence. The flow entering the compressor is cooled by the condensing device and then flows into the heat exchange device to exchange heat with the total flow flowing into the first three-way proportional valve through the coolant circulation pump;

[0036] The first circuit includes a battery and an electric heater, the second circuit includes a controller and a motor driver, and the third circuit includes a body motor, a body motor controller, and a power module.

[0037] A fourth aspect of the present application provides a new energy vehicle, comprising the thermal management system described above.

[0038] A fifth aspect of the present application provides a machine-readable storage medium having instructions stored thereon. When the instructions are executed by a processor, the processor is configured to execute the above-mentioned control method for a thermal management system.

[0039] The above technical solution provides a control method for a thermal management system, wherein the thermal management system includes a first circuit, a second circuit, a third circuit and a coolant circulation pump, the coolant circulation pump is connected to a first three-way proportional valve, the first circuit is connected to the second three-way proportional valve through the first three-way proportional valve, and the second circuit is connected to the third circuit through the second three-way proportional valve, the first circuit includes a battery and an electric heater, the second circuit includes a controller and a motor driver, and the third circuit includes a body motor, a body motor controller, and a power module. When the thermal management system is in operation, the ambient temperature of each circuit and a preset optimal operating temperature range are obtained; when the ambient temperature of any circuit is outside the preset optimal operating temperature range, the first opening of the first three-way proportional valve is determined based on the first ambient temperature of the first circuit to adjust the first flow rate flowing into the first circuit; the second opening of the second three-way proportional valve is determined based on the first and second temperature differences between the first and second circuits to adjust the second flow rate flowing into the second circuit; the first target speed of the coolant circulation pump is determined based on the ambient temperature of each circuit to adjust the total flow rate flowing into the first three-way proportional valve; and the ambient temperature of each circuit is adjusted based on the total flow rate, the first flow rate, and the second flow rate. This method connects multiple circuits through only two three-way proportional valves, and controls the flow of multiple closed-loop circuits at the same time by controlling the three-way proportional valves to achieve temperature control of each circuit. While effectively reducing components, it also reduces the installation space of the thermal management system and effectively reduces the energy consumption of the thermal management system.

[0040] Other features and advantages of the embodiments of the present application will be described in detail in the subsequent detailed description. BRIEF DESCRIPTION OF THE DRAWINGS

[0041] The accompanying drawings are used to provide a further understanding of the embodiments of the present application and constitute a part of the specification. Together with the following detailed description, they are used to explain the embodiments of the present application but do not constitute a limitation on the embodiments of the present application. In the accompanying drawings:

[0042] Figure 1 A schematic diagram of an application environment of a control method for a thermal management system according to an embodiment of the present application is schematically shown;

[0043] Figure 2 The following schematically shows a flow chart of a control method for a thermal management system according to an embodiment of the present application;

[0044] Figure 3 Schematically shows a flow chart for controlling the opening of a three-way proportional valve according to an embodiment of the present application;

[0045] Figure 4 A schematic diagram of a control flow for a three-way proportional valve according to an embodiment of the present application is shown;

[0046] Figure 5 A schematic diagram of a control flow for a coolant circulation pump according to an embodiment of the present application is shown;

[0047] Figure 6 A schematic diagram of a control flow for a compressor according to an embodiment of the present application is shown;

[0048] Figure 7 The internal structure diagram of a computer device according to an embodiment of the present application is schematically shown.

[0049] Description of Reference Numerals

[0050] 101 Coolant circulation pump 102 First three-way proportional valve

[0051] 103 First Circuit 104 Second Circuit

[0052] 105 Third circuit 106 Second three-way proportional valve

[0053] 107 Radiator 108 Compressor

[0054] 109 Heat exchange device 110 Condensing device

[0055] 111 Gas-liquid separation device 112 Check valve

[0056] 113 Battery 114 Electric Heater

[0057] 115 Controller 116 Motor Driver

[0058] 117 Upper motor 118 Upper motor controller

[0059] 119 Power Module DETAILED DESCRIPTION

[0060] To make the purpose, technical solutions, and advantages of the embodiments of the present application clearer, the technical solutions in the embodiments of the present application will be clearly and completely described below in conjunction with the drawings in the embodiments of the present application. It should be understood that the specific implementation methods described herein are only used to illustrate and explain the embodiments of the present application and are not intended to limit the embodiments of the present application. All other embodiments obtained by ordinary technicians in this field based on the embodiments of the present application without making creative efforts are within the scope of protection of this application.

[0061] It should be noted that if the embodiments of the present application involve directional indications (such as up, down, left, right, front, back, etc.), the directional indications are only used to explain the relative position relationship, movement status, etc. between the various components under a certain specific posture (as shown in the accompanying drawings). If the specific posture changes, the directional indications will also change accordingly.

[0062] In addition, if there are descriptions involving "first" and "second" in the embodiments of the present application, the descriptions of "first" and "second" are only for descriptive purposes and cannot be understood as indicating or implying their relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include at least one of such features. In addition, the technical solutions between the various embodiments can be combined with each other, but they must be based on the ability of ordinary technicians in this field to implement them. When the combination of technical solutions is contradictory or cannot be implemented, it should be deemed that such a combination of technical solutions does not exist and is not within the scope of protection required by this application.

[0063] The control method for a thermal management system provided in this application can be applied to Figure 1 In the application environment shown in the figure, Figure 1 As shown, a thermal management system is provided, comprising:

[0064] A coolant circulation pump 101 is connected to the first three-way proportional valve 102 and is used to adjust the total flow rate flowing into the first three-way proportional valve 102;

[0065] A first circuit 103, a second circuit 104, and a third circuit 105. The first circuit 103 is connected to the second three-way proportional valve 106 via a first three-way proportional valve 102, and the second circuit 104 is connected to the third circuit 105 via the second three-way proportional valve 106. The first three-way proportional valve 102 is used to adjust a first flow rate flowing into the first circuit 103, and the second three-way proportional valve 106 is used to adjust a second flow rate flowing into the second circuit 104.

[0066] The heat dissipation device 107 is connected to the coolant circulation pump 101;

[0067] The compressor circuit includes a compressor 108, a heat exchange device 109 connected to the compressor 108, a condensing device 110, and a gas-liquid separation device 111. The compressor circuit is connected to the coolant circulation circuit through the heat exchange device 109. The coolant circulation circuit includes a one-way valve 112, a heat dissipation device 107, a coolant circulation pump 101, and a first three-way proportional valve 102 connected in sequence. The flow flowing into the compressor 108 is cooled by the condensing device 110 and then flows into the heat exchange device 109 to exchange heat with the total flow flowing into the first three-way proportional valve 102 through the coolant circulation pump 101;

[0068] The first circuit 103 includes a battery 113 and an electric heater 114 , the second circuit 104 includes a controller 115 and a motor driver 116 , and the third circuit 105 includes a bodywork motor 117 , a bodywork motor controller 118 , and a power module 119 .

[0069] In this embodiment, it should be noted that the first end of the coolant circulation pump 101 is connected to the heat dissipation device 107, and the second end is connected to the heat exchange device 109. The coolant circulation pump can be a cooling water pump suitable for conveying clean water or liquids of physical and chemical properties in a high-pressure operating system. In this technical solution, it is used to convey the total flow to the first three-way proportional valve 102.

[0070] The first end of the first three-way proportional valve 102 is connected to the heat exchange device 109, the second end is connected to the first circuit 103, and the third end is connected to the second three-way proportional valve 106. The first end of the second three-way proportional valve 106 is connected to the first three-way proportional valve 102, the second end is connected to the second circuit 104, and the third end is connected to the third circuit 105. A three-way proportional valve may be a valve device having three inlets, one for inlet and two for outlets (left inlet, right outlet, and bottom outlet).

[0071] The first end of the heat dissipation device 107 is connected to the one-way valve 112, the second circuit 104 and the third circuit 105. The heat dissipation device can refer to a series of devices used to conduct and release heat. In this technical solution, the heat dissipation device can be composed of a radiator and a cooling fan.

[0072] The first end of the compressor 108 is connected to the condensing device 110, and the second end is connected to the gas-liquid separation device 111. The compressor may refer to a driven fluid machine that boosts low-pressure gas to high-pressure gas.

[0073] The first end of the heat exchanger 109 is connected to the gas-liquid separator 111, and the second end is connected to the condensing device 110. A heat exchanger may be a device that transfers part of the heat of a hot fluid to a cold fluid, also known as a heat exchanger. In this technical solution, the heat exchanger 109 is used to exchange heat between the compressor circuit and the cooling cycle circuit.

[0074] The first end of the condensing device 110 is connected to the compressor 108, and the second end is connected to the heat exchange device 109. The condensing device is a type of heat exchanger that can convert gas or vapor into liquid and transfer the heat in the pipe to the air near the pipe in a very fast manner.

[0075] The first end of the gas-liquid separator 111 is connected to the compressor 108, and the second end is connected to the heat exchanger 109. The gas-liquid separator may be a separation device that uses the principles of centrifugal separation or wire mesh filtration to achieve liquid removal. Its operating principle is that when liquid refrigerant enters the gas-liquid separator, the expansion velocity decreases, causing the liquid to separate or hit a baffle, thereby separating the liquid.

[0076] The first end of one-way valve 112 is connected to the first end of first circuit 103, and the second end is connected to heat sink 107. A one-way valve is a check valve, which can be a directional control valve that allows airflow to flow in one direction only. In this technical solution, the flow into the first circuit flows out through battery 113 and then flows into one-way valve 112. Under the action of one-way valve 112, the flow cannot flow back to battery 113 and can only flow through one-way valve 112 to heat sink 107. This prevents temperature fluctuations in the first circuit caused by flow back into the first circuit.

[0077] The first end of the battery 113 is connected to the electric heater 114, and the second end is connected to the one-way valve 112. The first end of the electric heater 114 is connected to the first three-way proportional valve 102, and the second end is connected to the battery 113. The electric heater may be a W-PTC, which refers to an electrical appliance that uses electrical energy to achieve a heating effect. The first end of the controller 115 is connected to the second three-way proportional valve 106, and the second end is connected to the motor driver 116. The first end of the motor driver 116 is connected to the first end of the controller 115, and the second end is connected to the heat sink 107. The first end of the upper motor 117 is connected to the upper controller 118, and the second end is connected to the power module 119. The first end of the upper motor controller 118 is connected to the second three-way proportional valve 106, and the second end is connected to the upper motor 117. The first end of the power module 119 is connected to the upper motor 117, and the second end is connected to the heat sink 107.

[0078] In this embodiment, it should be noted that the thermal management system can be applied to new energy vehicles, where new energy vehicles refer to vehicles that use unconventional vehicle fuels as a power source (or use conventional vehicle fuels and adopt new vehicle-mounted power devices), and integrate advanced technologies in vehicle power control and drive to form automobiles with advanced technical principles, new technologies, and new structures.

[0079] Figure 2 The following schematically shows a flow chart of a control method for a thermal management system according to an embodiment of the present application. Figure 2 As shown, the embodiment of the present application provides a control method for a thermal management system, which can be applied to Figure 1 The thermal management system shown in the figure includes a first circuit, a second circuit, a third circuit, and a coolant circulation pump. The coolant circulation pump is connected to a first three-way proportional valve. The first circuit is connected to a second three-way proportional valve through the first three-way proportional valve, and the second circuit is connected to the third circuit through the second three-way proportional valve. The first circuit includes a battery and an electric heater, the second circuit includes a controller and a motor driver, and the third circuit includes a body motor, a body motor controller, and a power module. The control method includes:

[0080] Step 201 : When the thermal management system is in operation, obtain the ambient temperature of each circuit and the preset optimal operating temperature range.

[0081] In the embodiment of the present application, it should be noted that each circuit includes different components. For example, the first circuit may include a battery and an electric heater, the second circuit may include a controller and a motor driver, and the third circuit may include a top-mounted controller, a top-mounted motor, and a power module. Different components require different operating temperatures. Therefore, each circuit has a corresponding preset optimal operating temperature range, where the preset optimal operating temperature range can be set according to actual needs. At the same time, a temperature sensor ( Figure 1 (not shown) to collect the ambient temperature of each circuit in real time. Therefore, when the thermal management system is in operation, the controller can obtain the ambient temperature of each circuit so as to adjust the ambient temperature of each circuit based on the current ambient temperature according to actual needs.

[0082] Step 202 : When the ambient temperature of any circuit is outside a preset optimal operating temperature range, determine a first opening of a first three-way proportional valve based on a first ambient temperature of the first circuit to adjust a first flow rate flowing into the first circuit.

[0083] In the embodiment of the present application, it should be noted that the suitable temperature range of the first circuit is smaller, the second circuit is second, and the suitable temperature range of the third circuit is larger. Therefore, when regulating the ambient temperature of the first circuit, the second circuit, and the third circuit, the first circuit should be regulated first to ensure that the ambient temperature of the first circuit is within the suitable temperature range, and secondly, the ambient temperature of the second circuit should be ensured to be within the suitable temperature range. In this technical solution, the first end of the first three-way proportional valve is connected to the coolant circulation pump, the second end of the first three-way proportional valve is connected to the first circuit, and the third end of the first three-way proportional valve is connected to the first end of the second three-way proportional valve. The total flow delivered by the coolant circulation pump will flow into the first circuit and the second three-way valve respectively through the first three-way proportional valve, and the flow flowing into the first circuit can be adjusted by controlling the opening of the first three-way proportional valve. Therefore, when the current ambient temperature of any circuit is outside the preset optimal operating temperature range of the circuit, the first opening of the first three-way proportional valve can be determined based on the first ambient temperature of the first circuit to adjust the first flow flowing into the first circuit. Specifically, the larger the first opening degree is, the larger the first flow rate flowing into the first circuit is, and the smaller the first opening degree is, the smaller the first flow rate flowing into the first circuit is.

[0084] In this embodiment, if Figure 3As shown, a control flow diagram for a three-way proportional valve is provided, in which the first opening of the first three-way proportional valve is determined based on the current ambient temperature of the first circuit. Specifically, the current valve opening and the opening adjustment coefficient of the first three-way proportional valve are obtained, wherein the opening adjustment coefficient is determined according to the controlled first circuit, including the space size of the first circuit, the length of the cooling pipe and the cross-sectional area. At the same time, the opening adjustment period and the temperature difference adjustment coefficient of the first three-way proportional valve are determined based on the first temperature difference of the first circuit, that is, the difference between the current ambient temperature and the preset optimal working temperature. Thus, the controller calculates the first opening of the first three-way proportional valve based on the current valve opening of the first three-way proportional valve, the opening adjustment coefficient, the temperature difference adjustment coefficient and the opening adjustment period. Specifically, the first opening can be calculated according to the following formula, including:

[0085] θ1 n =θ1 o +k1*Δ1 k *t1,

[0086] Among them, θ1 n is the second opening of the first three-way proportional valve, θ1 o is the current valve opening of the first three-way proportional valve, k1 is the opening adjustment coefficient, Δ1 k is the temperature difference adjustment coefficient, and t1 is the opening adjustment cycle.

[0087] Step 203 : Determine a second opening of the second three-way proportional valve based on a first temperature difference of the first circuit and a second temperature difference of the second circuit to adjust a second flow rate flowing into the second circuit, wherein the temperature difference refers to the difference between the ambient temperature of the circuit and a preset optimal operating temperature range of the circuit.

[0088] In the embodiments of the present application, it should be noted that the temperature difference refers to the difference between the ambient temperature of the circuit and the preset optimal operating temperature range of the circuit. After determining the first opening of the first three-way proportional valve based on the first ambient temperature of the first circuit to adjust the first flow rate flowing into the first circuit, the initial regulation of the first circuit is completed, and the controller further performs initial regulation on the second circuit and the third circuit in sequence. In this technical solution, the first end of the second three-way proportional valve is connected to the first three-way proportional valve, the second end of the second three-way proportional valve is connected to the second circuit, and the third end of the second three-way proportional valve is connected to the third circuit. Therefore, the flow diverted to the second three-way proportional valve will be diverted to the second circuit and the third circuit. When the controller regulates the ambient temperature of the second circuit and the third circuit, it should prioritize ensuring that the ambient temperature of the second circuit is within the appropriate temperature range. Therefore, the second opening of the second three-way proportional valve can be determined based on the first temperature difference of the first circuit and the second temperature difference of the second circuit to regulate the second flow rate flowing into the second circuit. Specifically, the larger the second opening, the larger the second flow rate flowing into the second circuit, and the smaller the second opening, the smaller the second flow rate flowing into the second circuit.

[0089] In one embodiment, determining the second opening of the second three-way proportional valve based on the first temperature difference of the first circuit and the second temperature difference of the second circuit includes: obtaining the current valve opening and the opening adjustment coefficient of the second three-way proportional valve; determining the temperature difference adjustment coefficient of the second three-way proportional valve based on the first temperature difference of the first circuit and the second temperature difference of the second circuit, and determining the opening adjustment period of the second three-way proportional valve based on the second temperature difference of the second circuit; determining the second opening of the second three-way proportional valve based on the current valve opening, the opening adjustment coefficient, the temperature difference adjustment coefficient and the opening adjustment period of the second three-way proportional valve.

[0090] In this embodiment, in this embodiment, as Figure 3 As shown, a schematic diagram of a three-way proportional valve opening control process is provided. The second opening of the second three-way proportional valve is determined based on the first temperature difference of the first circuit and the second temperature difference of the second circuit. Specifically, the current valve opening and the opening adjustment coefficient of the second three-way proportional valve are obtained, wherein the opening adjustment coefficient is determined based on the controlled second circuit, including the space size of the second circuit, the length of the cooling pipe, and the cross-sectional area. At the same time, the temperature difference adjustment coefficient of the second three-way proportional valve is determined based on the first temperature difference of the first circuit, i.e., the difference between the current ambient temperature of the first circuit and the preset optimal operating temperature, and the second temperature difference of the second circuit, i.e., the difference between the current ambient temperature of the second circuit and the preset optimal operating temperature, and the opening adjustment period of the second three-way proportional valve is determined based on the second temperature difference of the second circuit. Thus, the controller calculates the second opening of the second three-way proportional valve based on the current valve opening of the second three-way proportional valve, the opening adjustment coefficient, the temperature difference adjustment coefficient, and the opening adjustment period.

[0091] In one embodiment, the second opening of the second three-way proportional valve is determined according to formula (3):

[0092] θ2 n =θ2 o +k2*Δ2 k *t2 (3),

[0093] Among them, θ2 n is the second opening of the second three-way proportional valve, θ2 o is the current valve opening of the second three-way proportional valve, k2 is the opening adjustment coefficient, Δ2 k is the temperature difference adjustment coefficient, and t2 is the opening adjustment cycle.

[0094] Step 204 : determining a first target speed of the coolant circulation pump based on the ambient temperature of each circuit, and adjusting the speed of the coolant circulation pump to the first target speed to regulate the total flow into the first three-way proportional valve.

[0095] In the embodiments of the present application, it should be noted that, in order to ensure that the thermal management system regulates the ambient temperature of the three circuits to within the preset optimal operating temperature range corresponding to each circuit at low power, the controller's regulation can be divided into two independent regulation stages based on the energy operation mode. Specifically, the first regulation stage is energy distribution, which sequentially adjusts the first flow rate of the first circuit and the second flow rate of the second circuit by controlling the first opening of the first three-way proportional valve and the second opening of the second three-way proportional valve in sequence to complete the preliminary regulation of the ambient temperature of the first and second circuits. The second regulation stage is energy transmission. In this technical solution, the first end of the coolant circulation pump is connected to the heat dissipation device, and the second end of the coolant circulation pump is connected to the first three-way proportional valve. The total flow rate flowing into the first three-way proportional valve is adjusted by controlling the speed of the coolant circulation pump, so that the cooling energy at the inlet of the first three-way proportional valve is increased, thereby changing the current ambient temperature of the three circuits. Specifically, the first target speed of the coolant circulation pump can be determined based on the ambient temperature of each circuit. After determining the first target speed, the controller adjusts the speed of the coolant circulation pump to the first target speed to regulate the total flow rate flowing into the first three-way proportional valve.

[0096] In one embodiment, for each circuit, multiple temperature intervals are set for the ambient temperature of each circuit, and the multiple temperature intervals include at least a first temperature interval, a second temperature interval, a third temperature interval and a fourth temperature interval, wherein the upper limit value of the first temperature interval is lower than the lower limit value of the second temperature interval, the upper limit value of the second temperature interval is lower than the lower limit value of the third temperature interval, and the upper limit value of the third temperature interval is lower than the lower limit value of the fourth temperature interval. The preset optimal operating temperature interval of each circuit is included in the second temperature interval, and the control method also includes: determining the first target speed of the coolant circulation pump based on the temperature interval in which the current ambient temperature of each circuit is located.

[0097] In this embodiment, it should be noted that Figure 4 As shown, a control flow diagram for a three-way proportional valve is provided. When the first opening of the first three-way proportional valve increases, the first flow rate flowing into the first circuit increases. When the second opening of the second three-way proportional valve increases, the second flow rate flowing into the second circuit increases. For each circuit, multiple temperature intervals are set for the ambient temperature of each circuit. The multiple temperature intervals include a first temperature interval, a second temperature interval, a third temperature interval, and a fourth temperature interval. Figure 4 As shown, the temperature intervals from bottom to top may be the fourth temperature interval of the red area, the third temperature interval of the yellow area, the second temperature interval of the green area, and the first temperature interval of the yellow area. Among them, the red area is a dangerous temperature. If the components are continuously at a dangerous temperature for a certain period of time, it may cause damage to the components. The yellow area is a rated dangerous area. In this technical solution, the first temperature interval and the third temperature interval are both rated dangerous areas. The first temperature interval is an area where the temperature is too low, and the third temperature interval is an area where the temperature is too high. The green area is a suitable temperature, which is a temperature range suitable for the operation of components. Therefore, for each loop, the preset optimal operating temperature interval of each loop should be within the suitable temperature range, that is, the preset optimal operating temperature interval of each loop is included in the second temperature interval. As Figure 4 As shown, for each circuit, the blue area in the second temperature range may be the preset optimal operating temperature range of each circuit.

[0098] In this embodiment, for multiple temperature intervals of any one circuit, the upper limit of the first temperature interval is lower than the lower limit of the second temperature interval, the upper limit of the second temperature interval is lower than the lower limit of the third temperature interval, and the upper limit of the third temperature interval is lower than the lower limit of the fourth temperature interval. Figure 4As shown, taking the first loop as an example, the temperature range of the first temperature interval of the first loop may include [10°C, 20°C), the temperature range of the second temperature interval may include [20°C, 30°C), the temperature range of the third temperature interval may include [30°C, 40°C), and the temperature range of the fourth temperature interval may include 40°C and above. Taking the second loop as an example, the temperature range of the first temperature interval of the second loop may include [10°C, 20°C), the temperature range of the second temperature interval may include [20°C, 40°C), the temperature range of the third temperature interval may include [40°C, 50°C), and the temperature range of the fourth temperature interval may include 50°C and above. Taking the third loop as an example, the temperature range of the first temperature interval of the third loop may include [0°C, 10°C), the temperature range of the second temperature interval may include [10°C, 50°C), the temperature range of the third temperature interval may include [40°C, 50°C), and the temperature range of the fourth temperature interval may include 50°C and above.

[0099] In this embodiment, if Figure 5 As shown, a control flow diagram for a coolant circulation pump is provided. When a coolant circulation pump adjustment command is triggered, the controller determines a first target speed of the coolant circulation pump based on the triggering condition to control the coolant circulation pump's speed to periodically increase or decrease. Specifically, the first target speed of the coolant circulation pump can be determined based on the ambient temperature of each circuit. For each circuit, a first temperature range, a second temperature range, a third temperature range, and a fourth temperature range are set for the ambient temperature of each circuit. Therefore, the first target speed of the coolant circulation pump can be determined based on the temperature range in which the current ambient temperature of each circuit falls. Thus, after determining the first target speed, the controller adjusts the speed of the coolant circulation pump to the first target speed to regulate the total flow into the first three-way proportional valve, thereby increasing the cooling energy at the inlet of the first three-way proportional valve. Thus, the flow is then distributed through the first and second three-way proportional valves to adjust the ambient temperature of each circuit. It should be noted that as the speed of the coolant circulation pump changes, its power also changes. When the deviation between the coolant circulation pump power and the power of the cooling circulation circuit reaches a set threshold, the power-generated coolant circulation pump speed adjustment is triggered. In addition, since the cooling circulation loop is also adjusted at this time, the power deviation gradually decreases until it is less than the set threshold, and the speed adjustment of the coolant circulation pump will be stopped, thereby ensuring that the coolant circulation pump operates at low power and meets the cooling demand conditions.

[0100] In one embodiment, determining the first target speed of the coolant circulation pump based on the temperature range in which the current ambient temperature of each circuit is located includes: obtaining the current speed, the first power speed regulation cycle and the first temperature speed regulation cycle of the coolant circulation pump; when the ambient temperatures of all circuits are not lower than the lower limit value of the second temperature range corresponding to each circuit and the ambient temperature of any circuit is in the second temperature range corresponding to the circuit, determining the first target speed adjustment coefficient of the coolant circulation pump based on the current power of the coolant circulation pump and the compressor; determining the first ambient temperature speed adjustment coefficient of the coolant circulation pump based on the temperature difference of all circuits; determining the first target speed of the coolant circulation pump according to the current speed, the first power speed regulation cycle, the first temperature speed regulation cycle, the first target speed adjustment coefficient and the first ambient temperature speed regulation coefficient of the coolant circulation pump.

[0101] In this embodiment, if Figure 5 As shown, when the ambient temperature of all circuits is not lower than the lower limit of the second temperature interval corresponding to each circuit and the ambient temperature of any one circuit is in the second temperature interval corresponding to the circuit, the first target speed adjustment coefficient of the coolant circulation pump is determined based on the current power of the coolant circulation pump and the compressor. Specifically, the second temperature interval is the green area of ​​the suitable temperature range. Therefore, when the ambient temperature of the three circuits is not lower than the lower limit of the suitable temperature range and the ambient temperature of any one circuit is in the suitable temperature range, the first target speed adjustment coefficient of the coolant circulation pump is determined based on the current power of the coolant circulation pump and the compressor. It should be noted that when the difference between the current power of the coolant circulation pump and the compressor is greater than the set maximum allowable value, the first target speed adjustment coefficient increases with the positive value of the excess part, and when the difference between the current power of the coolant circulation pump and the compressor is less than the set minimum allowable value, the first target speed adjustment coefficient decreases with the negative value of the excess part. At the same time, the current speed, the first power speed regulation period and the first temperature speed regulation period of the coolant circulation pump are obtained, and the first ambient temperature speed regulation coefficient of the coolant circulation pump is determined based on the temperature difference of all circuits. It should be noted that when the temperature difference of the ambient temperatures of the three circuits is positive, the first ambient temperature speed regulation coefficient is a rated positive value. When the temperature difference of the ambient temperatures of the three circuits is negative, the first ambient temperature speed regulation coefficient is a rated negative value. In other cases, the first ambient temperature speed regulation coefficient is 0.

[0102] In this embodiment, after obtaining the current speed of the coolant circulation pump, the first power speed regulation cycle, the first temperature speed regulation cycle, the first target speed adjustment coefficient and the first ambient temperature speed regulation coefficient, the controller can determine the first target speed of the coolant circulation pump based on the current speed of the coolant circulation pump, the first power speed regulation cycle, the first temperature speed regulation cycle, the first target speed adjustment coefficient and the first ambient temperature speed regulation coefficient.

[0103] In one embodiment, the first target speed of the coolant circulation pump is determined according to formula (1):

[0104] N n =N o -Δ1 n *t1 n +Δ2 n *t2 n (1),

[0105] Among them, N n is the first target speed of the coolant circulation pump, N o is the current speed of the coolant circulation pump, Δ1 n is the first target speed adjustment coefficient, t1 n is the first power speed regulation cycle, Δ2 n is the first ambient temperature speed regulation coefficient, t2 n This is the first temperature regulation cycle.

[0106] In one embodiment, the thermal management system also includes a compressor, and determining the first target speed of the coolant circulation pump based on the temperature range in which the current ambient temperature of each circuit is located includes: when the ambient temperature of all circuits is higher than the upper limit value of the second temperature range corresponding to each circuit, or when the ambient temperature of all circuits is not lower than the lower limit value of the second temperature range corresponding to each circuit and the ambient temperature of any circuit is in the fourth temperature range corresponding to the circuit, the preset maximum speed of the coolant circulation pump is determined as the first target speed of the coolant circulation pump; when the ambient temperature of all circuits is in the second temperature range corresponding to each circuit and the current speed of the coolant circulation pump is less than the preset minimum speed of the coolant circulation pump, the preset minimum speed of the coolant circulation pump is determined as the first target speed of the coolant circulation pump; when the ambient temperature of any circuit is lower than the lower limit value of the second temperature range corresponding to the circuit and the current speed of the compressor is zero, the first target speed of the coolant circulation pump is determined to be zero.

[0107] In this embodiment, the thermal management system further includes a compressor, such as Figure 5As shown, when the ambient temperatures of all circuits are higher than the upper limit of the second temperature range corresponding to each circuit, or when the ambient temperatures of all circuits are not lower than the lower limit of the second temperature range corresponding to each circuit and the ambient temperature of any one circuit is in the fourth temperature range corresponding to the circuit, the preset maximum speed of the coolant circulation pump is determined as the first target speed of the coolant circulation pump. Specifically, the second temperature range is the green area of ​​the suitable temperature range, and the fourth temperature range is the red area of ​​the dangerous temperature range. Therefore, when the ambient temperatures of the three circuits are higher than the upper limit of the suitable temperature range corresponding to each circuit, or when the ambient temperatures of the three circuits are not lower than the lower limit of the suitable temperature range corresponding to each circuit and the ambient temperature of any one circuit is in the dangerous temperature range, the preset maximum speed N of the coolant circulation pump is set to max As the first target speed of the coolant circulation pump, let N n =N max .

[0108] In this embodiment, when the ambient temperature of all circuits is within the second temperature range corresponding to each circuit and the current speed of the coolant circulation pump is less than the preset minimum speed of the coolant circulation pump, the preset minimum speed of the coolant circulation pump is determined as the first target speed of the coolant circulation pump. Specifically, the second temperature range is the green area of ​​the suitable temperature range, and the preset minimum speed of the coolant circulation pump can be set according to the specifications of the selected coolant circulation pump. Therefore, when the ambient temperature of the three circuits is within the suitable temperature range corresponding to each circuit and the current speed of the coolant circulation pump is less than the preset minimum speed of the coolant circulation pump, the preset minimum speed N of the coolant circulation pump is set. min As the first target speed of the coolant circulation pump, let N n =N min .

[0109] In this embodiment, if the ambient temperature of any circuit is lower than the lower limit of the second temperature range corresponding to the circuit and the current speed of the compressor is zero, the first target speed of the coolant circulation pump is determined to be zero. Specifically, the second temperature range is the green area of ​​the suitable temperature range. Therefore, if the ambient temperature of any circuit among the three circuits is lower than the lower limit of the suitable temperature range corresponding to the circuit and the current speed of the compressor is 0, that is, the compressor is stopped, the first target speed of the coolant circulation pump is determined to be 0, that is, let N n =0.

[0110] Step 205 : adjusting the ambient temperature of each circuit based on the total flow rate, the first flow rate, and the second flow rate so that the ambient temperature of each circuit is within the corresponding preset optimal operating temperature range.

[0111] In an embodiment of the present application, a controller regulates a first flow rate flowing into the first circuit by controlling a first opening of a first three-way proportional valve, regulates a second flow rate flowing into the second circuit by controlling a second opening of a second three-way proportional valve, and regulates the total flow rate flowing into the first three-way proportional valve by controlling a first target speed of a coolant circulation pump. Specifically, the first three-way proportional valve regulates the first flow rate according to the ambient temperature of the first circuit, giving priority to ensuring that the first circuit is within a suitable temperature range. The second three-way proportional valve regulates the second flow rate according to the ambient temperature of the second circuit, giving priority to ensuring that the second circuit is within a suitable temperature range. Therefore, the third circuit is the first to experience a high temperature anomaly, while the ambient temperatures of the other two circuits are above the rated value. At this time, the coolant circulation pump adjustment condition is triggered, and the controller increases the speed of the coolant circulation pump, thereby increasing the total flow rate at the inlet of the first three-way proportional valve, thereby changing the ambient temperature of the three circuits. The first three-way proportional valve and the second three-way proportional valve then distribute the flow rates to achieve ambient temperature adjustment of the circuits, thereby ensuring that the ambient temperatures of the three circuits all reach the preset optimal operating temperature range. At the same time, the third circuit is the first to experience abnormally low temperature, while the ambient temperatures of the other two circuits are lower than the rated value. At this time, the coolant circulation pump adjustment condition is triggered, and the controller reduces the speed of the coolant circulation pump, thereby reducing the total flow at the inlet of the first three-way proportional valve. The two three-way proportional valves then distribute the flow to complete the ambient temperature adjustment of each circuit.

[0112] In one embodiment, the thermal management system also includes a compressor circuit and a heat dissipation device connected to the coolant circulation pump. The compressor circuit includes a compressor, a heat exchange device connected to the compressor, a condensing device and a gas-liquid separation device. The compressor circuit is connected to the coolant circulation circuit through the heat exchange device. The coolant circulation circuit includes a one-way valve, a heat dissipation device, a coolant circulation pump, and a first three-way proportional valve connected in sequence. The control method also includes: determining the second target speed of the compressor based on the temperature range in which the current ambient temperature of each circuit is located, and adjusting the speed of the compressor to the second target speed to adjust the flow delivery speed of the circuit where the compressor is located; adjusting the heat exchange speed of the heat exchange device based on the flow delivery speed, so that the flow flowing into the compressor is cooled by the condensing device and then flows into the heat exchange device and exchanges heat with the total flow flowing into the first three-way proportional valve through the coolant circulation pump.

[0113] In this embodiment, it should be noted that the thermal management system further includes a compressor circuit and a heat sink connected to a coolant circulation pump. The compressor circuit includes a compressor, a heat exchanger connected to the compressor, a condenser, and a gas-liquid separator. The compressor has a first end connected to the condenser and a second end connected to the gas-liquid separator. The heat exchanger has a first end connected to the gas-liquid separator and a second end connected to the condenser. The condenser has a first end connected to the compressor and a second end connected to the heat exchanger. The gas-liquid separator has a first end connected to the compressor and a second end connected to the heat exchanger. The compressor circuit is connected to a coolant circulation circuit via the heat exchanger. The coolant circulation circuit includes a heat sink, a coolant circulation pump, and a first three-way proportional valve, which are connected in sequence. The first end of the one-way valve is connected to the first end of the first circuit and the second end to the heat sink. The first end of the heat sink is connected to the one-way valve, the second circuit, and the third circuit. The first end of the coolant circulation pump is connected to the heat sink and the second end to the heat exchanger. The first end of the first three-way proportional valve is connected to the heat exchanger, the second end to the first circuit, and the third end to the second three-way proportional valve. In order to ensure that the thermal management system controls the ambient temperature of the three circuits at low power to reach the preset optimal operating temperature range corresponding to each circuit, the controller's control also includes a third control stage. Specifically, the first control stage is energy distribution, which adjusts the first flow of the first circuit and the second flow of the second circuit in turn by controlling the first opening of the first three-way proportional valve and the second opening of the second three-way proportional valve in turn to complete the preliminary control of the ambient temperature of the first circuit and the second circuit. The second control stage is energy transmission. In this technical solution, the first end of the coolant circulation pump is connected to the heat dissipation device, and the second end of the coolant circulation pump is connected to the first three-way proportional valve. By controlling the speed of the coolant circulation pump to adjust the total flow flowing into the first three-way proportional valve, the refrigeration energy at the inlet of the first three-way proportional valve is increased, thereby changing the current ambient temperature of the three circuits. The third control stage is energy generation, which adjusts the total refrigeration flow flowing into the first three-way proportional valve by controlling the speed of the compressor. As Figure 6A control flow diagram for a compressor is shown. After triggering a compressor adjustment command, the controller periodically adjusts the compressor's second target speed based on corresponding conditions, thereby adjusting the total refrigeration flow rate flowing into the first three-way proportional valve. Specifically, the controller can determine the compressor's second target speed based on the temperature range within which the current ambient temperature of each circuit falls. After determining the second target speed, the controller adjusts the compressor's speed to the second target speed to adjust the flow rate of the circuit in which the compressor resides. The heat exchange rate of the heat exchanger is thereby adjusted based on the flow rate, so that the flow rate flowing into the compressor, after being cooled by the condensing device, flows into the heat exchanger and exchanges heat with the total flow rate flowing into the first three-way proportional valve via the coolant circulation pump. When the ambient temperatures of the three circuits reach a preset optimal operating temperature range, the compressor speed adjustment conditions are no longer met, and the controller ceases adjusting the compressor speed. Simultaneously, when the power difference between the coolant circulation pump and the condensing pump reaches a set threshold, power-driven compressor speed adjustment is triggered. Since the cooling circuit is also adjusting at this time, the power difference gradually decreases until it falls below the set threshold, at which point the compressor speed adjustment ceases, ensuring that the compressor operates at low power and meets cooling conditions.

[0114] In one embodiment, determining the second target speed of the compressor based on the temperature range in which the current ambient temperature of each circuit is located includes: obtaining the current speed of the compressor, the second power speed regulation cycle, and the second temperature speed regulation cycle; when the ambient temperatures of all circuits are not lower than the lower limit value of the second temperature range corresponding to each circuit and the ambient temperature of any circuit is in the second temperature range corresponding to the circuit, determining the second target speed adjustment coefficient of the compressor based on the power of the coolant circulation pump and the compressor; determining the second ambient temperature speed adjustment coefficient of the compressor based on the temperature difference of all circuits; and determining the second target speed of the compressor according to the second target speed adjustment coefficient, the second ambient temperature speed adjustment coefficient, and the current speed of the compressor.

[0115] In this embodiment, if Figure 6As shown, when the ambient temperature of all circuits is not lower than the lower limit of the second temperature interval corresponding to each circuit and the ambient temperature of any one circuit is in the second temperature interval corresponding to the circuit, the second target speed adjustment coefficient of the compressor is determined based on the power of the coolant circulation pump and the compressor. Specifically, the second temperature interval is the green area of ​​the suitable temperature range. Therefore, when the ambient temperature of the three circuits is not lower than the lower limit of the suitable temperature range and the ambient temperature of any one circuit is in the suitable temperature range, the second target speed adjustment coefficient of the compressor is determined based on the current power of the coolant circulation pump and the compressor. It should be noted that when the difference between the current power of the coolant circulation pump and the compressor is greater than the set maximum allowable value, the second target speed adjustment coefficient increases with the positive value of the excess part, and when the difference between the current power of the coolant circulation pump and the compressor is less than the set minimum allowable value, the second target speed adjustment coefficient decreases with the negative value of the excess part. At the same time, the current speed, the second power speed regulation period and the second temperature speed regulation period of the compressor are obtained, and the second ambient temperature speed regulation coefficient of the compressor is determined based on the temperature difference of all circuits. It should be noted that when the temperature difference of the ambient temperatures of the three circuits is positive, the second ambient temperature speed regulation coefficient is a rated positive value. When the temperature difference of the ambient temperatures of the three circuits is negative, the second ambient temperature speed regulation coefficient is a rated negative value. In other cases, the second ambient temperature speed regulation coefficient is 0.

[0116] In this embodiment, after obtaining the current speed of the compressor, the second power speed regulation cycle, the second temperature speed regulation cycle, the second target speed adjustment coefficient and the second ambient temperature speed regulation coefficient, the controller can determine the second target speed of the compressor based on the current speed of the compressor, the second power speed regulation cycle, the second temperature speed regulation cycle, the second target speed adjustment coefficient and the second ambient temperature speed regulation coefficient.

[0117] In one embodiment, the second target speed of the compressor is determined according to formula (2):

[0118] M=M o -Δ1 n *t1 n +Δ2 n *t2 n (2),

[0119] Wherein, M is the second target speed of the compressor, M o is the current speed of the compressor, Δ1 n is the second target speed adjustment coefficient, t1 n is the second power speed regulation cycle, Δ2 n is the second ambient temperature speed control coefficient, t2 n This is the second temperature regulation cycle.

[0120] In one embodiment, determining the second target speed of the compressor based on the temperature range in which the current ambient temperature of each circuit is located includes: when the ambient temperatures of all circuits are higher than the upper limit value of the second temperature range corresponding to each circuit, or when the ambient temperatures of all circuits are not lower than the lower limit value of the second temperature range corresponding to each circuit and the ambient temperature of any circuit is in the fourth temperature range corresponding to the circuit, determining the preset maximum speed of the compressor as the second target speed of the compressor; when the differences between the second ambient temperature of the second circuit and the third ambient temperature of the third circuit and the lower limit value of the second temperature range corresponding to each circuit are both within a preset range and the current speed of the compressor is less than the preset minimum speed of the compressor, determining the second target speed of the compressor to be zero.

[0121] In this embodiment, if Figure 6 As shown, when the ambient temperatures of all circuits are higher than the upper limit of the second temperature range corresponding to each circuit, or when the ambient temperatures of all circuits are not lower than the lower limit of the second temperature range corresponding to each circuit and the ambient temperature of any one circuit is within the fourth temperature range corresponding to that circuit, the preset maximum speed of the compressor is determined as the second target speed of the compressor. Specifically, the second temperature range is the green area of ​​the suitable temperature range, and the fourth temperature range is the red area of ​​the dangerous temperature range. Therefore, when the ambient temperatures of the three circuits are higher than the upper limit of the suitable temperature range corresponding to each circuit, or when the ambient temperatures of the three circuits are not lower than the lower limit of the suitable temperature range corresponding to each circuit and the ambient temperature of any one circuit is within the dangerous temperature range, the preset maximum speed of the compressor is set to max As the second target speed of the compressor, let M n =M max .

[0122] In this embodiment, the second temperature interval is the green area of ​​the suitable temperature range, and the preset range can be set according to actual needs, for example, including but not limited to being set to no higher than 1°C, so that the current ambient temperature of the loop is as close as possible to the lower limit of the second temperature interval of the loop. Taking the first loop as an example, the second temperature interval of the first loop is [20°C, 30°C). Assuming that the current ambient temperature of the first loop is 21°C, the difference between 21°C and the lower limit of 20°C of the second temperature interval is 1°C. At this time, the difference between the current ambient temperature of the first loop and the lower limit of the second temperature interval is within the preset range. Therefore, when the difference between the second ambient temperature of the second loop and the third ambient temperature of the third loop and the lower limit of the suitable temperature range corresponding to each loop are both within the preset range and the current speed of the compressor is less than the preset minimum speed of the compressor, the second target speed of the compressor is determined to be 0, that is, let M n =0.

[0123] This technical solution connects multiple circuits through only two three-way proportional valves, and controls the flow of multiple closed-loop circuits at the same time by controlling the three-way proportional valves to achieve temperature control of each circuit. While effectively reducing components, it also reduces the installation space of the thermal management system and effectively reduces the energy consumption of the thermal management system.

[0124] The present invention provides a control device for a thermal management system, including:

[0125] a memory configured to store instructions;

[0126] The controller is configured to call the instructions from the memory and implement the above-mentioned control method for the thermal management system when executing the instructions.

[0127] An embodiment of the present application provides a storage medium having a program stored thereon, which, when executed by a processor, implements the above-mentioned control method for a thermal management system.

[0128] In one embodiment, a computer device is provided. The computer device may be a server, and its internal structure diagram may be as follows: Figure 7 As shown. The computer device includes a processor A01, a network interface A02, a memory (not shown in the figure) and a database (not shown in the figure) connected via a system bus. Among them, the processor A01 of the computer device is used to provide computing and control capabilities. The memory of the computer device includes an internal memory A03 and a non-volatile storage medium A04. The non-volatile storage medium A04 stores an operating system B01, a computer program B02 and a database (not shown in the figure). The internal memory A03 provides an environment for the operation of the operating system B01 and the computer program B02 in the non-volatile storage medium A04. The database of the computer device is used to store control method data for a thermal management system. The network interface A02 of the computer device is used to communicate with an external terminal through a network connection. When the computer program B02 is executed by the processor A01, a control method for a thermal management system is implemented.

[0129] Those skilled in the art will understand that Figure 7 The structure shown in the figure is only a block diagram of a part of the structure related to the solution of the present application, and does not constitute a limitation on the computer device to which the solution of the present application is applied. The specific computer device may include more or fewer components than shown in the figure, or combine certain components, or have a different component arrangement.

[0130] An embodiment of the present application provides a device, which includes a processor, a memory, and a program stored in the memory and executable on the processor. When the processor executes the program, steps of a control method for a thermal management system are implemented.

[0131] The present application also provides a computer program product which, when executed on a data processing device, is adapted to execute a program of initializing the steps of a control method for a thermal management system.

[0132] 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 take the form of a complete hardware embodiment, a complete software embodiment, or an embodiment combining software and hardware. Furthermore, the present application may take the form of a computer program product implemented on one or more computer-usable storage media (including but not limited to magnetic disk storage, CD-ROM, optical storage, etc.) containing computer-usable program code.

[0133] 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 produce 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.

[0134] These computer program instructions may also be stored in a computer readable memory that can direct a computer or other programmable data processing device to work 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 The function specified in one or more boxes.

[0135] These computer program instructions can also be loaded onto a computer or other programmable data processing device so that a series of operational steps are executed on the computer or other programmable device to produce a computer-implemented process, thereby providing the instructions executed on the computer or other programmable device 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.

[0136] In a typical configuration, a computing device includes one or more processors (CPUs), input / output interfaces, network interfaces, and memory.

[0137] The memory may include non-permanent memory in a computer-readable medium, random access memory (RAM) and / or non-volatile memory in the form of read-only memory (ROM) or flash RAM. The memory is an example of a computer-readable medium.

[0138] Computer-readable media includes permanent and non-permanent, removable and non-removable media that can be implemented by any method or technology to store information. The information can be computer-readable instructions, data structures, program modules or other data. Examples of computer storage media include, but are not limited to, phase change memory (PRAM), static random access memory (SRAM), dynamic random access memory (DRAM), other types of random access memory (RAM), read-only memory (ROM), electrically erasable programmable read-only memory (EEPROM), flash memory or other memory technology, compact disc read-only memory (CD-ROM), digital versatile disc (DVD) or other optical storage, magnetic cassettes, magnetic disk storage or other magnetic storage devices or any other non-transmission media that can be used to store information that can be accessed by a computing device. As defined herein, computer-readable media does not include transitory computer-readable media (transitory media), such as modulated data signals and carrier waves.

[0139] It should also be noted that the terms "comprises," "includes," or any other variations thereof are intended to encompass non-exclusive inclusion, such that a process, method, commodity, or apparatus that includes a series of elements includes not only those elements but also other elements not explicitly listed, or includes elements inherent to such process, method, commodity, or apparatus. In the absence of further limitations, an element defined by the phrase "comprises a..." does not exclude the presence of other identical elements in the process, method, commodity, or apparatus that includes the element.

[0140] The above are merely embodiments of the present application and are not intended to limit the present application. For those skilled in the art, the present application may have various modifications and variations. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principles of the present application should be included within the scope of the claims of the present application.

Claims

1. A control method for a thermal management system, characterized in that: The thermal management system includes a first circuit, a second circuit, a third circuit, and a coolant circulation pump, wherein the coolant circulation pump is connected to a first three-way proportional valve, the first circuit is connected to a second three-way proportional valve via the first three-way proportional valve, and the second circuit is connected to the third circuit via the second three-way proportional valve. The control method includes: When the thermal management system is in operation, obtaining the ambient temperature of each circuit and a preset optimal operating temperature range; When the ambient temperature of any one circuit is outside a preset optimal operating temperature range, determining a first opening of the first three-way proportional valve based on a first ambient temperature of the first circuit to adjust a first flow rate flowing into the first circuit; Determining a second opening of the second three-way proportional valve based on a first temperature difference of the first circuit and a second temperature difference of the second circuit to adjust a second flow rate flowing into the second circuit, wherein the temperature difference refers to a difference between an ambient temperature of the circuit and a preset optimal operating temperature range of the circuit; determining the second opening of the second three-way proportional valve based on the first temperature difference of the first circuit and the second temperature difference of the second circuit includes: obtaining a current valve opening and an opening adjustment coefficient of the second three-way proportional valve; determining the temperature difference adjustment coefficient of the second three-way proportional valve based on the first temperature difference of the first circuit and the second temperature difference of the second circuit, and determining an opening adjustment period of the second three-way proportional valve based on the second temperature difference of the second circuit; and determining the second opening of the second three-way proportional valve based on the current valve opening, the opening adjustment coefficient, the temperature difference adjustment coefficient, and the opening adjustment period of the second three-way proportional valve; determining a first target speed of the coolant circulation pump based on the ambient temperature of each circuit, and adjusting the speed of the coolant circulation pump to the first target speed to regulate the total flow into the first three-way proportional valve; The ambient temperature of each circuit is adjusted based on the total flow, the first flow, and the second flow, so that the ambient temperature of each circuit is within a corresponding preset optimal operating temperature range.

2. The control method for a thermal management system according to claim 1, characterized in that: For each circuit, multiple temperature intervals are set for the ambient temperature of each circuit, and the multiple temperature intervals include at least a first temperature interval, a second temperature interval, a third temperature interval, and a fourth temperature interval, wherein the upper limit value of the first temperature interval is lower than the lower limit value of the second temperature interval, the upper limit value of the second temperature interval is lower than the lower limit value of the third temperature interval, and the upper limit value of the third temperature interval is lower than the lower limit value of the fourth temperature interval, and the preset optimal operating temperature interval of each circuit is included in the second temperature interval. The control method further includes: The first target speed of the coolant circulation pump is determined based on the temperature range in which the current ambient temperature of each circuit is located.

3. The control method for a thermal management system according to claim 2, characterized in that: Determining the first target speed of the coolant circulation pump based on the temperature range of the current ambient temperature of each circuit includes: Obtaining the current speed, first power speed regulation period, and first temperature speed regulation period of the coolant circulation pump; determining a first target speed adjustment coefficient of the coolant circulating pump based on the coolant circulating pump and the current power of the coolant circulating pump when the ambient temperature of all circuits is not lower than the lower limit of the second temperature range corresponding to each circuit and the ambient temperature of any one circuit is within the second temperature range corresponding to the circuit; Determining a first ambient temperature speed regulation coefficient of the coolant circulation pump based on the temperature difference of all circuits; The first target speed of the coolant circulation pump is determined according to the current speed of the coolant circulation pump, the first power speed regulation period, the first temperature speed regulation period, the first target speed adjustment coefficient, and the first ambient temperature speed regulation coefficient.

4. The control method for a thermal management system according to claim 3, characterized in that: The first target speed of the coolant circulation pump is determined according to formula (1): （1）， in, is the first target speed of the coolant circulation pump, is the current speed of the coolant circulation pump, is the first target speed adjustment coefficient, is the first power speed regulation cycle, is the first ambient temperature speed regulation coefficient, This is the first temperature regulation cycle.

5. The control method for a thermal management system according to claim 2, characterized in that: The thermal management system further includes a compressor, and determining the first target speed of the coolant circulation pump based on the temperature range in which the current ambient temperature of each circuit is located includes: When the ambient temperatures of all circuits are higher than the upper limit of the second temperature interval corresponding to each circuit, or when the ambient temperatures of all circuits are not lower than the lower limit of the second temperature interval corresponding to each circuit and the ambient temperature of any circuit is within the fourth temperature interval corresponding to the circuit, the preset maximum speed of the coolant circulation pump is determined as the first target speed of the coolant circulation pump; When the ambient temperature of all circuits is within the second temperature range corresponding to each circuit and the current speed of the coolant circulation pump is less than the preset minimum speed of the coolant circulation pump, determining the preset minimum speed of the coolant circulation pump as the first target speed of the coolant circulation pump; When the ambient temperature of any circuit is lower than the lower limit of the second temperature range corresponding to the circuit and the current speed of the compressor is zero, the first target speed of the coolant circulation pump is determined to be zero.

6. The control method for a thermal management system according to claim 1, characterized in that: The thermal management system further includes a compressor circuit and a heat dissipation device connected to the coolant circulation pump, the compressor circuit includes a compressor, a heat exchange device connected to the compressor, a condensing device, and a gas-liquid separation device, the compressor circuit is connected to the coolant circulation circuit through the heat exchange device, and the coolant circulation circuit includes the heat dissipation device, the coolant circulation pump, and the first three-way proportional valve connected in sequence, and the control method further includes: determining a second target speed of the compressor based on the temperature range of the current ambient temperature of each circuit, and adjusting the speed of the compressor to the second target speed to regulate the flow delivery speed of the circuit where the compressor is located; The heat exchange speed of the heat exchange device is adjusted based on the flow delivery speed so that the flow flowing into the compressor is cooled by the condensing device and then flows into the heat exchange device for heat exchange with the total flow flowing into the first three-way proportional valve through the coolant circulation pump.

7. The control method for a thermal management system according to claim 6, characterized in that: Determining the second target speed of the compressor based on the temperature range in which the current ambient temperature of each circuit is located includes: Obtaining the current speed, the second power speed regulation period, and the second temperature speed regulation period of the compressor; determining a second target speed adjustment coefficient of the compressor based on the power of the coolant circulation pump and the compressor when the ambient temperature of all circuits is not lower than the lower limit of the second temperature range corresponding to each circuit and the ambient temperature of any circuit is within the second temperature range corresponding to the circuit; determining a second ambient temperature speed control coefficient of the compressor based on the temperature differences of all circuits; The second target speed of the compressor is determined according to the second target speed adjustment coefficient, the second ambient temperature speed adjustment coefficient, and the current speed of the compressor.

8. The control method for a thermal management system according to claim 7, characterized in that: The second target speed of the compressor is determined according to formula (2): （2）， in, is the second target speed of the compressor, is the current speed of the compressor, is the second target speed adjustment coefficient, is the second power speed regulation cycle, is the second ambient temperature speed regulation coefficient, This is the second temperature regulation cycle.

9. The control method for a thermal management system according to claim 6, characterized in that: Determining the second target speed of the compressor based on the temperature range in which the current ambient temperature of each circuit is located includes: When the ambient temperatures of all circuits are higher than the upper limit of the second temperature interval corresponding to each circuit, or when the ambient temperatures of all circuits are not lower than the lower limit of the second temperature interval corresponding to each circuit and the ambient temperature of any circuit is within the fourth temperature interval corresponding to the circuit, the preset maximum speed of the compressor is determined as the second target speed of the compressor; When the differences between the second ambient temperature of the second circuit and the third ambient temperature of the third circuit and the lower limit values ​​of the second temperature intervals corresponding to the respective circuits are both within a preset range and the current speed of the compressor is less than a preset minimum speed of the compressor, the second target speed of the compressor is determined to be zero.

10. The control method for a thermal management system according to claim 1, characterized in that: The second opening of the second three-way proportional valve is determined according to formula (3): （3）， in, is the second opening of the second three-way proportional valve, is the current valve opening of the second three-way proportional valve, is the opening adjustment coefficient, is the temperature difference adjustment coefficient, is the opening adjustment period.

11. A control device for a thermal management system, characterized in that: include: a memory configured to store instructions; A controller is configured to call the instructions from the memory and implement the control method for a thermal management system according to any one of claims 1 to 10 when executing the instructions.

12. A thermal management system, characterized in that: The thermal management system is configured to execute the control method for a thermal management system according to any one of claims 1 to 10.

13. The thermal management system according to claim 12, wherein: Also includes: A heat dissipation device connected to a coolant circulation pump; A compressor circuit, the compressor circuit comprising a compressor, a heat exchange device connected to the compressor, a condensing device, and a gas-liquid separation device, the compressor circuit being connected to a coolant circulation circuit via the heat exchange device, the coolant circulation circuit comprising a one-way valve, the heat dissipation device, the coolant circulation pump, and a first three-way proportional valve connected in sequence, the flow flowing into the compressor being cooled by the condensing device and then flowing into the heat exchange device for heat exchange with the total flow flowing through the coolant circulation pump into the first three-way proportional valve; Among them, the first circuit includes a battery and an electric heater, the second circuit includes a controller and a motor driver, and the third circuit includes a body motor, a body motor controller and a power module.

14. A new energy vehicle, characterized in that: A thermal management system comprising the thermal management system according to any one of claims 12 or 13.

15. A machine-readable storage medium having instructions stored thereon, characterized in that: When the instruction is executed by a controller, the controller is configured to execute the control method for a thermal management system according to any one of claims 1 to 10.

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