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

Abstract

The invention provides a control method, device and system for a thermal management system and a new energy vehicle. The thermal management system comprises a first loop, a second loop, a third loop and a cooling liquid circulating pump, and the control method comprises the steps that under the condition that the thermal management system is in operation, the environment temperature of each loop and the preset optimal working temperature interval are obtained; when the environment temperature of any loop is out of the preset optimal working temperature interval, the first opening degree of a first three-way proportional valve is determined based on the first environment temperature of the first loop so as to adjust the first flow flowing into the first loop; determining a second opening degree of a second three-way proportional valve based on the first and second temperature differences of the first and second loops so as to adjust a second flow flowing into the second loop; based on the environment temperature of each loop, a first target rotating speed of a cooling liquid circulating pump is determined, and the total flow flowing into a first three-way proportional valve is adjusted; the ambient temperature of each loop is adjusted based on the total flow, the first flow, and the second flow.

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 more and more widespread. It is more important to be able to accurately control the different temperatures of multiple electrical devices in a limited space, which involves multiple technical fields such as thermal management technology, electrical control technology, energy efficiency and environmental protection. Therefore, how to achieve this goal efficiently and accurately has become an important technical challenge.

[0003] At present, in the field of new energy vehicles, a one-to-one control method is usually used to control the temperature of multiple spaces, that is, one cooling device controls the temperature of one space. Or a fixed cooling power is used to adjust the temperature of each environment separately. This method not only increases energy consumption, but also increases the required installation space due to the increase in required components, and the failure rate of the thermal management system will also increase with the increase in components. 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 high energy consumption and large installation space caused by the large number of thermal management system components in the prior art.

[0005] In order to achieve the above-mentioned object, the first aspect of the present application provides 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 through the first three-way proportional valve, the second circuit is connected to the third circuit through the second three-way proportional valve, and the control method includes:

[0006] When the thermal management system is in operation, obtain the ambient temperature of each circuit and preset the 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 adjust the total flow into the first three-way proportional valve;

[0010] 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 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, 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 control 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, and the control method also includes: determining a 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 control cycle.

[0022] In an embodiment of the present application, determining the second target speed of the compressor based on the temperature interval 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 interval corresponding to each circuit, or when the ambient temperatures of all circuits are not lower than the lower limit value of the second temperature interval corresponding to each circuit and the ambient temperature of any circuit is in the fourth temperature interval 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 interval 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.

[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, the opening adjustment coefficient, the temperature difference adjustment coefficient and the 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 a 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 is connected to the first three-way proportional valve, and the coolant circulation pump is used to adjust the total flow rate flowing into the first three-way proportional valve;

[0032] The first circuit, the second circuit and the third circuit, the first circuit is connected with the second three-way proportional valve through the first three-way proportional valve, the second circuit is connected with the third circuit through the second three-way proportional valve, the first three-way proportional valve is used to adjust the first flow rate flowing into the first circuit, and the second three-way proportional valve is used to adjust the second flow rate 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] A compressor circuit, 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 a 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 flowing into 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, which, when executed by a processor, configure the processor 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 a 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 circuit includes a battery and an electric heater, the second circuit includes a controller and a motor driver, and the third circuit includes a top motor, a top 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; 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 only through 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 specific implementation section. 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 specific implementations, 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 A schematic diagram of a control method for a thermal management system according to an embodiment of the present application is shown;

[0044] Figure 3 A schematic diagram of a three-way proportional valve opening control process according to an embodiment of the present application is shown schematically;

[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 process for a coolant circulation pump according to an embodiment of the present application is shown;

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

[0048] Figure 7 The internal structure 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] In order to make the purpose, technical solution and advantages of the embodiments of the present application clearer, the technical solution 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 used to limit the embodiments of the present application. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without making creative work 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...), the directional indications are only used to explain the relative position relationship, movement status, etc. between the components under a certain specific posture (as shown in the accompanying drawings). If the specific posture changes, the directional indication will also change accordingly.

[0062] In addition, if there are descriptions involving "first", "second", etc. in the embodiments of the present application, the descriptions of "first", "second", etc. are only used for descriptive purposes and cannot be understood as indicating or suggesting their relative importance or implicitly indicating the number of technical features indicated. 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 the field to implement them. When the combination of technical solutions is contradictory or cannot be implemented, it should be deemed that such 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 the coolant circulation pump 101 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, wherein 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, wherein 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] A compressor circuit, 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 a 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 that are connected in sequence. The flow rate 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 rate 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 body motor 117 , a body 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 may refer to a cooling water pump suitable for conveying clean water or liquid of physical and chemical properties in a high-pressure operation system, and is used to convey the total flow to the first three-way proportional valve 102 in this technical solution.

[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. The three-way proportional valve may refer to a valve device with three ports, one inlet and two outlets (left inlet, right and bottom outlet) on the valve body.

[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 may be a general term for a series of devices used to conduct and release heat. In the present technical solution, the heat dissipation device may be composed of a radiator and a heat dissipation 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 increases low-pressure gas to high-pressure gas.

[0073] The first end of the heat exchange device 109 is connected to the gas-liquid separation device 111, and the second end is connected to the condensing device 110. The heat exchange device may refer to a device that transfers part of the heat of a hot fluid to a cold fluid, also known as a heat exchanger. In the present technical solution, the heat exchange device 109 is used for heat exchange between the compressor circuit and the cooling circulation 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 kind of heat exchanger, which can convert gas or vapor into liquid and transfer the heat in the pipe to the air near the pipe in a very fast way.

[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 exchange device 109. The gas-liquid separator may refer to a separation device that uses the principles of centrifugal separation and wire mesh filtration to achieve liquid removal. Its working principle is that when the liquid refrigerant enters the gas-liquid separator, the expansion speed decreases, causing the liquid to separate or hit a baffle, thereby separating the liquid.

[0076] The first end of the one-way valve 112 is connected to the first end of the first circuit 103, and the second end is connected to the heat sink 107. The one-way valve is a check valve, which can refer to a directional control valve in which the airflow can only flow in one direction but not in the opposite direction. In the present technical solution, the flow into the first circuit flows out through the battery 113 and then flows into the one-way valve 112. Under the action of the one-way valve 112, the flow cannot flow back to the battery 113, and can only flow into the heat sink 107 through the one-way valve 112. In this way, the temperature jitter of the first circuit caused by the flow flowing back into the first circuit can be avoided.

[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. Among them, the electric heater can refer to W-PTC, which refers to an electrical appliance that uses electric 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 dissipation device 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 dissipation device 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 their power source (or use conventional vehicle fuels and adopt new on-board 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 present application embodiment 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, 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, the third circuit includes a top motor, a top motor controller, and a power module, and 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 embodiments 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 controller, a 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 the 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 prioritize the ambient temperature of the first circuit to be within the suitable temperature range, and secondly, the ambient temperature of the second circuit should be prioritized to be within the suitable temperature range. In the present 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, the third end of the first three-way proportional valve is connected to the first end of the second three-way proportional valve, and 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, and 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 first circuit controlled, including the space size of the first circuit, the length of the cooling line and the cross-sectional area. At the same time, the opening adjustment cycle 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 cycle. 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, 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 the difference between the ambient temperature of the circuit and a preset optimal operating temperature range of the circuit.

[0088] In the embodiment 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 the present 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, so 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 give priority to ensuring that the ambient temperature of the second circuit is in a suitable 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 adjust 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, and 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 according to the second circuit controlled, including the space size, cooling line length and cross-sectional area of ​​the second circuit. 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, that is, the difference between the current ambient temperature of the first circuit and the preset optimal working temperature, and the second temperature difference of the second circuit, that is, the difference between the current ambient temperature of the second circuit and the preset optimal working temperature, and the opening adjustment cycle 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, opening adjustment coefficient, temperature difference adjustment coefficient and opening adjustment cycle of the second three-way proportional valve.

[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 adjust the total flow into the first three-way proportional valve.

[0095] In the embodiment 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 at low power to reach the preset optimal operating temperature range corresponding to each circuit, the regulation of the controller can be divided into two independent regulation stages based on the energy operation mode. Specifically, the first regulation stage is energy distribution, and the first flow of the first circuit and the second flow of the second circuit are adjusted in sequence 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 circuit and the second circuit. The second regulation stage is energy transmission. In the present 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 flowing into the first three-way proportional valve is adjusted by controlling the speed of the coolant circulation pump, so that 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. 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 adjust the total flow 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, 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.

[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 in the red area, the third temperature interval in the yellow area, the second temperature interval in the green area, and the first temperature interval in 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, the components may be damaged. The yellow area is a rated dangerous area. In the present 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 the coolant circulation pump adjustment command is triggered, the controller determines the first target speed of the coolant circulation pump according to the triggering condition to control the speed of the coolant circulation pump to perform periodic increasing or decreasing adjustment. Specifically, the first target speed of the coolant circulation pump can be determined based on the ambient temperature of each circuit, and for each circuit, the first temperature interval, the second temperature interval, the third temperature interval and the fourth temperature interval 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 interval where the current ambient temperature of each circuit is located. Therefore, after determining the first target speed, the controller adjusts the speed of the coolant circulation pump to the first target speed to adjust the total flow into the first three-way proportional valve, so that the refrigeration energy at the inlet of the first three-way proportional valve is increased. Therefore, the flow is distributed through the first three-way proportional valve and the second three-way proportional valve to adjust the ambient temperature of each circuit. It should be noted that the power of the coolant circulation pump changes due to the change in speed. When the deviation between the power of the coolant circulation pump and the power of the cooling circulation circuit reaches the set threshold, the speed adjustment of the coolant circulation pump generated by the power will be triggered. Furthermore, since the cooling cycle 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 is stopped, thereby ensuring that the coolant circulation pump operates at low power and meets the cooling demand.

[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 adjustment 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 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 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 cycle and the first temperature speed regulation cycle 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 according to 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 control 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 temperature of all circuits is higher than the upper limit of the second temperature range corresponding to each circuit, or 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 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. Therefore, when the ambient temperature of the three circuits is higher than the upper limit of the suitable temperature range corresponding to each circuit, or when the ambient temperature of the three circuits is not lower than the lower limit of the suitable temperature range corresponding to each circuit and the ambient temperature of any circuit is in the dangerous temperature range, the preset maximum speed N of the coolant circulation pump is set to 0. 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 Set as the first target speed of the coolant circulation pump, that is, N n =N min .

[0109] In this embodiment, 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. Specifically, the second temperature range is the green area of ​​the suitable temperature range. Therefore, when 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, the first flow, and the second flow, 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, the controller adjusts the first flow rate flowing into the first circuit by controlling the first opening of the first three-way proportional valve, adjusts the second flow rate flowing into the second circuit by controlling the second opening of the second three-way proportional valve, and adjusts the total flow rate flowing into the first three-way proportional valve by controlling the first target speed of the coolant circulation pump. Specifically, the first three-way valve adjusts the first flow rate according to the ambient temperature of the first circuit, and gives priority to ensuring that the first circuit is in a suitable temperature range. The second three-way proportional valve adjusts the second flow rate according to the ambient temperature of the second circuit, and gives priority to ensuring that the second circuit is in a suitable temperature range. Therefore, the third circuit is the first to have a high temperature abnormality, while the ambient temperatures of the other two circuits are in a state of being rated high. At this time, the coolant circulation pump adjustment condition will be triggered, and the controller will increase 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, and then the first three-way proportional valve and the second three-way proportional valve will perform flow distribution to achieve ambient temperature regulation of the circuit, 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 abnormal low temperature, while the ambient temperature of the other two circuits is 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 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 one-way valve, a heat dissipation device, a coolant circulation pump, and a first three-way proportional valve connected in sequence, and the control method also includes: determining a 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 for heat exchange 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 also includes a compressor circuit and a heat sink connected to the coolant circulation pump, and the compressor circuit includes a compressor, a heat exchange device connected to the compressor, a condensing device and a gas-liquid separation device. Among them, the first end of the compressor is connected to the condensing device, and the second end is connected to the gas-liquid separation device. The first end of the heat exchange device is connected to the gas-liquid separation device, and the second end is connected to the condensing device. The first end of the condensing device is connected to the compressor, and the second end is connected to the heat exchange device. The first end of the gas-liquid separation device is connected to the compressor, and the second end is connected to the heat exchange device. The compressor circuit is connected to the coolant circulation circuit through the heat exchange device, and the coolant circulation circuit includes a heat sink, a coolant circulation pump, and a first three-way proportional valve connected in sequence. Among them, the first end of the one-way valve is connected to the first end of the first circuit, and the second end is connected 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 is connected to the heat exchange device. The first end of the first three-way proportional valve is connected to the heat exchange device, the second end is connected to the first circuit, and the third end is connected to the second three-way proportional valve. In order to ensure that the thermal management system can control 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 sequentially adjusts the first flow of the first circuit and the second flow 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 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 the present 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 flowing into the first three-way proportional valve is adjusted by controlling the speed of the coolant circulation pump, so that 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 6As shown, a control flow diagram for a compressor is provided. After the compressor adjustment command is triggered, the controller periodically adjusts the second target speed of the compressor according to the corresponding conditions, thereby adjusting the total refrigeration flow flowing into the first three-way proportional valve. Specifically, the controller can determine the second target speed of the compressor based on the temperature interval where the current ambient temperature of each circuit is located, and after determining the second target speed, adjust the speed of the compressor to the second target speed to adjust 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 flows into the heat exchange device after being cooled by the condensing device and exchanges heat with the total flow flowing into the first three-way proportional valve through the coolant circulation pump. When the ambient temperature of the three circuits reaches the preset optimal operating temperature interval, the compressor speed adjustment condition is not met, and the controller stops adjusting the speed of the compressor. At the same time, when the deviation between the power of the coolant circulation pump and the power of the condensing pump reaches the set threshold, the compressor speed adjustment generated by the power is triggered. Since the cooling circulation circuit also produces adjustment at this time, the deviation between the powers gradually decreases until it is less than the set threshold, and the compressor speed adjustment is stopped, thereby ensuring that the compressor is at low power and meets the refrigeration 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 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 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 control cycle.

[0120] In one embodiment, determining the second target speed of the compressor based on the temperature interval 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 interval corresponding to each circuit, or when the ambient temperatures of all circuits are not lower than the lower limit value of the second temperature interval corresponding to each circuit and the ambient temperature of any circuit is in the fourth temperature interval 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 interval 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 temperature of all circuits is higher than the upper limit of the second temperature range corresponding to each circuit, or 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 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. 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. Therefore, when the ambient temperature of the three circuits is higher than the upper limit of the suitable temperature range corresponding to each circuit, or when the ambient temperature of the three circuits is not lower than the lower limit of the suitable temperature range corresponding to each circuit and the ambient temperature of any circuit is in the dangerous temperature range, the preset maximum speed M 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 a 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 the second temperature interval of 20°C 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 application 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 a thermal management system when executing the instructions.

[0127] An embodiment of the present application provides a storage medium on which a program is stored. When the program is executed by a processor, the above-mentioned control method for a thermal management system is implemented.

[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 those shown in the figure, or combine certain components, or have a different arrangement of components.

[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 suitable for executing 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 adopt the form of a complete hardware embodiment, a complete software embodiment or an embodiment in combination with software and hardware. Moreover, the present application may adopt the form of a computer program product implemented on one or more computer-usable storage media (including but not limited to disk storage, CD-ROM, optical storage, etc.) that contain computer-usable program code.

[0133] The present application is described with reference to flowcharts and / or block diagrams of methods, devices (systems) and computer program products according to 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 processes and / or boxes in the flowchart and / or block diagram, can be implemented by computer program instructions. These computer program instructions can be provided to a processor of a general-purpose computer, a special-purpose computer, an embedded processor or other programmable data processing device to generate a machine, so that the instructions executed by the processor of the computer or other programmable data processing device generate instructions for implementing the processes in the flowchart and / or block diagram. Figure 1 A process or multiple processes and / or boxes Figure 1 A device that provides the functions specified in a block or multiple blocks.

[0134] These computer program instructions may also be stored in a computer-readable memory capable of directing a computer or other programmable data processing device to operate in a specific manner, so that the instructions stored in the computer-readable memory produce an article of manufacture including an instruction device, which implements the process Figure 1 A process or multiple processes and / or boxes Figure 1 A function specified in one or more boxes.

[0135] These computer program instructions can also be loaded onto a computer or other programmable data processing device so that a series of operating steps are executed on the computer or other programmable device to produce a computer-implemented process, thereby providing instructions for implementing the process. Figure 1 A process or multiple processes and / or boxes Figure 1 The steps for the functions specified in one or more boxes.

[0136] In a typical configuration, a computing device includes one or more processors (CPU), 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 include permanent and non-permanent, removable and non-removable media that can be implemented by any method or technology to store information. 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 disk read-only memory (CD-ROM), digital versatile disk (DVD) or other optical storage, magnetic cassettes, magnetic tape 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 temporary computer readable media (transitory media), such as modulated data signals and carrier waves.

[0139] It should also be noted that the terms "include", "comprises" or any other variations thereof are intended to cover non-exclusive inclusion, so that a process, method, commodity or device including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, commodity or device. In the absence of more restrictions, the elements defined by the sentence "comprises a ..." do not exclude the existence of other identical elements in the process, method, commodity or device including the elements.

[0140] The above are only 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 changes and variations. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present application should be included in 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, 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, the second circuit is connected to the third circuit through the second three-way proportional valve, and the control method includes: When the thermal management system is in operation, obtaining the ambient temperature of each circuit and the preset optimal operating temperature range; 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; 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 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 adjust 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, a plurality of temperature intervals are set for the ambient temperature of each circuit, and the plurality of 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, 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, and 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 interval of the current ambient temperature of each circuit 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 temperature of all circuits is not lower than the lower limit value of the second temperature interval corresponding to each circuit and the ambient temperature of any circuit is in the second temperature interval corresponding to the circuit, determining the 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; Determining a first ambient temperature speed control 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 cycle, the first temperature speed regulation cycle, 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): N n =N o -D1 n *t1 n +Δ2 n *t2 n (1), 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 control coefficient, t2 n This is the first temperature speed 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 interval in which the current ambient temperature of each loop is located includes: When the ambient temperature of all circuits is higher than the upper limit value of the second temperature interval corresponding to each circuit, or when the ambient temperature of all circuits is not lower than the lower limit value of the second temperature interval corresponding to each circuit and the ambient temperature of any circuit is in 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 rotation speed of the coolant circulation pump is less than the preset minimum rotation speed of the coolant circulation pump, determining the preset minimum rotation speed of the coolant circulation pump as the first target rotation 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 rotation speed of the compressor is zero, the first target rotation 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, 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: Determine a second target speed of the compressor based on the temperature range of the current ambient temperature of each circuit, and adjust the speed of the compressor to the second target speed to adjust the flow rate 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 interval in which the current ambient temperature of each circuit is located comprises: Acquire the current speed, the second power speed regulation period and the second temperature speed regulation period of the compressor; 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 circuit is in the second temperature interval 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 a second ambient temperature speed control coefficient of the compressor based on the temperature difference 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): M=M o -Δ1 n *t1 n +Δ2 n *t2 n (2), 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 period, Δ2 n is the second ambient temperature speed control coefficient, t2 n This is the second temperature speed 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 interval in which the current ambient temperature of each circuit is located comprises: When the ambient temperatures of all the circuits are higher than the upper limit of the second temperature interval corresponding to each circuit, or when the ambient temperatures of all the 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 in 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 the 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: Determining a second opening degree 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 includes: Obtaining the current valve opening and opening adjustment coefficient of the second three-way proportional valve; Determining a temperature difference adjustment coefficient 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, and determining an opening adjustment period of the second three-way proportional valve based on the second temperature difference of the second circuit; The second opening of the second three-way proportional valve is determined based on the current valve opening, the opening adjustment coefficient, the temperature difference adjustment coefficient and the opening adjustment cycle of the second three-way proportional valve.

11. The control method for a thermal management system according to claim 10, characterized in that: The second opening of the second three-way proportional valve is determined according to formula (3): θ2 n =θ2 o +k2*Δ2 k *t2 (3), 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 period.

12. 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 11 when executing the instructions.

13. A thermal management system, characterized in that: include: A coolant circulation pump connected to the first three-way proportional valve, the coolant circulation pump being used to adjust a total flow rate flowing into the first three-way proportional valve; A first circuit, a second circuit and a third circuit, the first circuit is connected with the second three-way proportional valve through the first three-way proportional valve, the second circuit is connected with the third circuit through the second three-way proportional valve, the first three-way proportional valve is used to adjust a first flow rate flowing into the first circuit, and the second three-way proportional valve is used to adjust a second flow rate flowing into the second circuit.

14. The thermal management system according to claim 13, characterized in that: Also includes: A heat dissipation device connected to the 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 the 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 into the first three-way proportional valve via the coolant circulation pump; 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.

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

16. 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 11.

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