A control method of a thermal management system and a thermal management system
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Patents(China)
- Current Assignee / Owner
- AIR INT THERMAL SYST R&D (SHANGHAI) CO LTD
- Filing Date
- 2025-11-12
- Publication Date
- 2026-07-21
Smart Images
Figure CN121157583B_ABST
Abstract
Description
Technical Field
[0001] The embodiments of the present invention relate to thermal management technology, and more particularly to a control method for a thermal management system and a thermal management system. Background Technology
[0002] Thermal management systems, which regulate temperature and achieve cooling and heating, are widely used in many fields, such as new energy vehicles. Reliable control is required during the operation of thermal management systems to ensure their normal functioning.
[0003] Currently, in existing thermal management systems, the individual differences in installation location, pipeline length, and component performance among the various thermal management subsystems can lead to uneven workloads, affecting the performance of the thermal management system. Summary of the Invention
[0004] This invention provides a control method and a thermal management system for achieving load balancing among various thermal management subsystems and improving the performance of the thermal management system.
[0005] In a first aspect, embodiments of the present invention provide a control method for a thermal management system. The thermal management system includes a controller and at least two thermal management subsystems. Each thermal management subsystem includes a compressor, a water pump, and a heater. The compressor, the water pump, and the heater are all electrically connected to the controller. The control method of the thermal management system is executed by the controller. The control method of the thermal management system includes:
[0006] Receive compressor speed information from each of the aforementioned thermal management subsystems;
[0007] Based on the rotational speed information, the rotational speed of the water pump, the output power of the heater, and the rotational speed of the compressor in each of the thermal management subsystems are controlled to balance the load of each of the thermal management subsystems.
[0008] Optionally, the thermal management system includes a first thermal management subsystem and a second thermal management subsystem;
[0009] The step of controlling the speed of the water pump, the output power of the heater, and the speed of the compressor in each of the thermal management subsystems based on the speed information includes:
[0010] If the absolute value of the difference between the compressor speed in the first thermal management subsystem and the compressor speed in the second thermal management subsystem is greater than a preset speed threshold and continues for a preset duration, then the speed of the water pumps in the first thermal management subsystem and the second thermal management subsystem will be adjusted.
[0011] When the pump speed regulation is completed, the output power of the heater and the speed of the compressor in the first thermal management subsystem and the second thermal management subsystem are controlled.
[0012] Optionally, the first thermal management subsystem includes a first compressor and a first heater, and the second thermal management subsystem includes a second compressor and a second heater;
[0013] The control of the output power of the heaters and the speed of the compressors in the first thermal management subsystem and the second thermal management subsystem includes:
[0014] If the absolute value of the difference between the speed of the first compressor and the speed of the second compressor is greater than the preset speed threshold and continues for the preset duration, then the output power of the first heater and the output power of the second heater are adjusted.
[0015] When the output power of the first heater and the output power of the second heater are adjusted, if the absolute value of the difference between the speed of the first compressor and the speed of the second compressor is greater than the preset speed threshold and continues for the preset duration, then the speed of the first compressor and the speed of the second compressor are adjusted.
[0016] Optionally, adjusting the speed of the first compressor and the speed of the second compressor includes:
[0017] If the speed of the first compressor is greater than the speed of the second compressor, then the speed of the first compressor is controlled to decrease;
[0018] If the speed of the first compressor is less than the speed of the second compressor, then the speed of the second compressor is controlled to decrease.
[0019] Optionally, adjusting the output power of the first heater and the output power of the second heater includes:
[0020] If the speed of the first compressor is less than the speed of the second compressor, then the output power of the second heater is increased and the output power of the first heater is decreased.
[0021] If the speed of the first compressor is greater than the speed of the second compressor, then the output power of the first heater is increased and the output power of the second heater is decreased.
[0022] Optionally, controlling the increase of the output power of the second heater and the decrease of the output power of the first heater includes:
[0023] The output power of the second heater is controlled to increase by a preset first step size. When the output power of the second heater reaches a preset first power threshold, the output power of the first heater is controlled to decrease by a preset second step size until the output power of the first heater reaches a preset second power threshold.
[0024] Optionally, the first thermal management subsystem includes a first compressor, a first heat release circuit water pump, and a first heat absorption circuit water pump, and the second thermal management subsystem includes a second compressor, a second heat release circuit water pump, and a second heat absorption circuit water pump.
[0025] Adjusting the speed of the water pumps in the first thermal management subsystem and the second thermal management subsystem includes:
[0026] If the speed of the first compressor is less than the speed of the second compressor, then when the thermal management system is in heating mode, the speed of the first heat release circuit water pump is increased and the speed of the second heat release circuit water pump is decreased.
[0027] When the speed adjustment of the first heat release circuit water pump and the second heat release circuit water pump is completed, the speed of the first heat absorption circuit water pump is increased and the speed of the second heat absorption circuit water pump is decreased.
[0028] Optionally, controlling the speed of the water pump, the output power of the heater, and the speed of the compressor in each of the thermal management subsystems includes:
[0029] The speed of the water pump, the output power of the heater, and the speed of the compressor in each of the thermal management subsystems are controlled sequentially. If the heater is not turned on, the speed of the water pump and the speed of the compressor in each of the thermal management subsystems are controlled sequentially.
[0030] In a second aspect, embodiments of the present invention provide a thermal management system, including: a controller and at least two thermal management subsystems, each of the thermal management subsystems including a compressor, a water pump and a heater, wherein the compressor, the water pump and the heater are all electrically connected to the controller, and the control method described in the first aspect is executed by the controller.
[0031] Optionally, the number of thermal management subsystems is two.
[0032] The present invention provides a control method and a thermal management system for a thermal management system. The thermal management system includes a controller and at least two thermal management subsystems. Each thermal management subsystem includes a compressor, a water pump, and a heater. The compressor, water pump, and heater are all electrically connected to the controller. The control method of the thermal management system is executed by the controller and includes: receiving the speed information of the compressor in each thermal management subsystem; and controlling the speed of the water pump, the output power of the heater, and the speed of the compressor in each thermal management subsystem according to the speed information, so as to balance the load of each thermal management subsystem. The control method and thermal management system of the present invention control the speed of the water pump, the output power of the heater, and the speed of the compressor in each thermal management subsystem according to the speed information of the compressor in each thermal management subsystem. For example, the speed of the water pump, the output power of the heater, and the speed of the compressor in each thermal management subsystem are controlled sequentially. First, the speed of the water pump in each thermal management subsystem is adjusted, then the output power of the heater in each thermal management subsystem is adjusted, and finally the speed of the compressor in each thermal management subsystem is adjusted. By adjusting different components sequentially, load balance of each thermal management subsystem is achieved, thereby improving the performance of the thermal management system. Attached Figure Description
[0033] Figure 1 This is a flowchart of a control method for a thermal management system provided in Embodiment 1 of the present invention;
[0034] Figure 2 This is a flowchart of a water pump adjustment method provided in Embodiment 1 of the present invention;
[0035] Figure 3 This is a flowchart of another water pump adjustment method provided in Embodiment 1 of the present invention;
[0036] Figure 4 This is a flowchart of a control method for a thermal management system provided in Embodiment 2 of the present invention;
[0037] Figure 5 This is a flowchart of a heater adjustment method provided in Embodiment 2 of the present invention;
[0038] Figure 6 This is a flowchart of a compressor adjustment method provided in Embodiment 2 of the present invention;
[0039] Figure 7 This is a structural block diagram of a control device for a thermal management system provided in Embodiment 3 of the present invention;
[0040] Figure 8 This is a schematic diagram of a thermal management system provided in Embodiment 4 of the present invention;
[0041] Figure 9This is a schematic diagram of a thermal management system in cabin cooling mode according to Embodiment 4 of the present invention;
[0042] Figure 10 This is a schematic diagram of a thermal management system in battery cooling mode provided in Embodiment 4 of the present invention;
[0043] Figure 11 This is a schematic diagram of a thermal management system in dual cooling modes provided in Embodiment 4 of the present invention;
[0044] Figure 12 This is a schematic diagram of a thermal management system in cabin heating mode according to Embodiment 4 of the present invention;
[0045] Figure 13 This is a schematic diagram of a thermal management system in dual heating modes provided in Embodiment 4 of the present invention. Detailed Implementation
[0046] The present invention will now be described in further detail with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and not intended to limit it. Furthermore, it should be noted that, for ease of description, the accompanying drawings show only the parts relevant to the present invention, and not all of the structures.
[0047] Example 1
[0048] Figure 1 This is a flowchart of a control method for a thermal management system provided in Embodiment 1 of the present invention. This embodiment is applicable to controlling thermal management systems, etc. The thermal management system includes a controller and at least two thermal management subsystems. Each thermal management subsystem includes a compressor, a water pump, and a heater. The compressor, water pump, and heater are all electrically connected to the controller. The method can be executed by the controller in the thermal management system. The controller can be implemented in software and / or hardware. The method specifically includes the following steps:
[0049] Step 110: Receive the compressor speed information from each thermal management subsystem.
[0050] The compressor speed information can be transmitted from the compressor to the controller. The controller can be set up with an interface that is electrically connected to the compressor to receive the speed information transmitted by the compressors in various thermal management subsystems.
[0051] Step 120: Based on the rotation speed information, control the rotation speed of the water pump, the output power of the heater, and the rotation speed of the compressor in each thermal management subsystem to balance the load of each thermal management subsystem.
[0052] Specifically, the speed of the water pump, the output power of the heater, and the speed of the compressor in each thermal management subsystem can be controlled sequentially. If the heater is not turned on, the speed of the water pump and the speed of the compressor in each thermal management subsystem are controlled sequentially. Taking a thermal management system comprising two thermal management subsystems as an example, if the speed difference between the compressors in the two thermal management subsystems exceeds a preset range and remains for a preset duration (for example, the preset range is -1000-1000 rpm, and the preset duration is 30 seconds), then the speed of the water pumps in both thermal management subsystems can be adjusted first, then the output power of the heaters in both thermal management subsystems can be adjusted, and finally the speed of the compressors in both thermal management subsystems can be adjusted. Furthermore, the output power of the heaters in different thermal management subsystems can be adjusted simultaneously, and the speed of the compressors in different thermal management subsystems can be adjusted simultaneously.
[0053] In one implementation, the thermal management system is a vehicle thermal management system, and its operating modes include a passenger compartment cooling mode, a battery cooling mode, or a heating mode. Each thermal management subsystem includes a compressor, a heater, and multiple water pumps, such as heat absorption circuit water pumps, heat release circuit water pumps, and battery water pumps. Taking a thermal management system comprising two thermal management subsystems as an example... Figure 2 This is a flowchart of a water pump adjustment method provided in Embodiment 1 of the present invention. Figure 3 This is a flowchart of another water pump adjustment method provided in Embodiment 1 of the present invention. (See reference) Figure 2 and Figure 3If the speed difference between the compressors in the two thermal management subsystems exceeds a preset range and remains so for a preset duration, in passenger cabin cooling mode, the heat absorption circuit water pump is preferentially adjusted. Every minute, the speed of the heat absorption circuit water pump in the thermal management subsystem with the lower compressor speed is increased by a calibrated value (this value is adjustable) to increase the heat load of that thermal management subsystem and increase its compressor speed. Simultaneously, every minute, the speed of the heat absorption circuit water pump in the thermal management subsystem with the higher compressor speed is decreased by a calibrated value (this value is adjustable) to reduce the heat load of that thermal management subsystem and decrease its compressor speed. If the speed of the heat absorption circuit water pump reaches the upper limit, such as 7000 rpm (this value is adjustable), or the speed of the heat pump's heat absorption circuit water pump reaches the lower limit, such as 4000 rpm (this value is adjustable), the pump speed is maintained unchanged to keep the pump operating within its normal effective operating range. In battery cooling or heating mode, the battery water pump is adjusted first. Every minute, the speed of the battery water pump in the thermal management subsystem with the lower compressor speed is increased by a certain value (adjustable) to increase the heat load of that subsystem and increase its compressor speed. Simultaneously, every minute, the speed of the battery water pump in the thermal management subsystem with the higher compressor speed is decreased by a certain value (adjustable) to reduce the heat load and decrease its compressor speed. If the battery water pump speed reaches 7000 rpm (adjustable) or 4000 rpm (adjustable), the pump speed is kept constant to maintain its normal effective operating range. If the pump adjustment reaches the upper limit of 7000 rpm or the lower limit of 4000 rpm, the pump output status under the current operating condition is recorded as a feedforward value for the next operation under the same conditions, enabling the system to reach a balanced operating state more quickly and enter the next adjustment phase. In addition, before adjusting the pump speed, first determine whether there is a fault in the system (this can be determined by the signals transmitted by components in the system such as the compressor, pump, and heater). If there is no fault in the system, adjust the pump speed. You can also adjust the pump opening. The process of adjusting the pump opening is similar to that of adjusting the pump speed. For details, please refer to the above process of adjusting the pump speed. It will not be repeated here.
[0054] It should be noted that the specific number of power levels and the specific duration of operation in this embodiment can be determined according to the actual energy compensation requirements, and are not limited here.
[0055] The control method for the thermal management system provided in this embodiment includes: receiving the compressor speed information of each thermal management subsystem; and controlling the speed of the water pump, the output power of the heater, and the speed of the compressor in each thermal management subsystem according to the speed information, so as to balance the load of each thermal management subsystem. The control method for the thermal management system provided in this embodiment controls the speed of the water pump, the output power of the heater, and the speed of the compressor in each thermal management subsystem according to the compressor speed information. For example, the speed of the water pump, the output power of the heater, and the speed of the compressor in each thermal management subsystem are controlled sequentially. First, the speed of the water pump in each thermal management subsystem is adjusted, then the output power of the heater in each thermal management subsystem is adjusted, and finally the speed of the compressor in each thermal management subsystem is adjusted. By adjusting different components sequentially, load balance of each thermal management subsystem is achieved, thereby improving the performance of the thermal management system.
[0056] Example 2
[0057] Figure 4 This is a flowchart of a control method for a thermal management system provided in Embodiment 2 of the present invention. This embodiment can be applied to controlling thermal management systems, etc. The thermal management system includes a controller and at least two thermal management subsystems. Each thermal management subsystem includes a compressor, a water pump, and a heater. The compressor, water pump, and heater are all electrically connected to the controller. The method can be executed by the controller in the thermal management system. The controller can be implemented in software and / or hardware. The method specifically includes the following steps:
[0058] Step 210: Receive the compressor speed information from each thermal management subsystem.
[0059] The compressor speed information can be transmitted from the compressor to the controller. The controller can be set up with an interface that is electrically connected to the compressor to receive the speed information transmitted by the compressors in various thermal management subsystems.
[0060] In one embodiment, the thermal management system includes two thermal management subsystems, namely a first thermal management subsystem and a second thermal management subsystem. The first thermal management subsystem includes a first compressor, a first heater, a first heat release circuit water pump, and a first heat absorption circuit water pump, and the second thermal management subsystem includes a second compressor, a second heater, a second heat release circuit water pump, and a second heat absorption circuit water pump.
[0061] Step 220: If the absolute value of the difference between the compressor speed in the first thermal management subsystem and the compressor speed in the second thermal management subsystem is greater than a preset speed threshold and continues for a preset duration, then adjust the speed of the water pumps in the first thermal management subsystem and the second thermal management subsystem.
[0062] The adjustment of the pump speeds in the first and second thermal management subsystems includes: if the speed of the first compressor is less than the speed of the second compressor, then when the thermal management system is in heating mode, the speed of the first heat-releasing circuit pump is increased and the speed of the second heat-releasing circuit pump is decreased; when the speed adjustment of the first and second heat-releasing circuit pumps is completed, the speed of the first heat-absorbing circuit pump is increased and the speed of the second heat-absorbing circuit pump is decreased. For example, the preset speed threshold is 1000 rpm, and the preset duration is 3 seconds. The control process for increasing and decreasing the pump speed can be referred to in the above embodiment. Figure 2 and Figure 3 The specific details will not be repeated here.
[0063] Step 230: When the water pump speed adjustment is completed, if the absolute value of the difference between the speed of the first compressor and the speed of the second compressor is greater than the preset speed threshold and continues for a preset time, then adjust the output power of the first heater and the output power of the second heater.
[0064] The adjustment of the output power of the first heater and the output power of the second heater includes: if the speed of the first compressor is less than the speed of the second compressor, then the output power of the second heater is increased and the output power of the first heater is decreased; if the speed of the first compressor is greater than the speed of the second compressor, then the output power of the first heater is increased and the output power of the second heater is decreased.
[0065] Specifically, when controlling the output power of the second heater to increase and the output power of the first heater to decrease, the output power of the second heater can be increased by a preset first step size. When the output power of the second heater reaches a preset first power threshold, the output power of the first heater is controlled to decrease by a preset second step size until the output power of the first heater reaches a preset second power threshold. The preset first step size and the preset second step size can be the same or different, and are not limited here.
[0066] Figure 5 This is a flowchart of a heater adjustment method provided in Embodiment 2 of the present invention. (See reference) Figure 5When the absolute value of the difference between the speeds of the first and second compressors exceeds a preset speed threshold and remains so for a preset duration, if the speed of the first compressor is less than that of the second compressor, the output power of the first heater is reduced by a calibrated value (adjustable) every minute. Since the total load of the first thermal management subsystem remains unchanged, this adjustment indirectly increases the compressor heat load of the first thermal management subsystem, thereby increasing the speed of the first compressor. Simultaneously, the output power of the second heater is increased by a calibrated value (adjustable) every minute. Since the total load of the second thermal management subsystem remains unchanged, this adjustment indirectly reduces the compressor heat load of the second thermal management subsystem, thereby reducing the speed of the second compressor. If the output power of the first heater reaches its upper limit (approaching 100%, calibrable) or the output power of the second heater reaches its lower limit (approaching 0%, calibrable), the output power of both the first and second heaters remains unchanged. If the speed of the first compressor is greater than that of the second compressor, the output power of the first heater increases, and the output power of the second heater decreases. For details, refer to the case where the speed of the first compressor is less than that of the second compressor; this will not be elaborated further here. If the heater's power regulation has reached the upper limit of 100% or the lower limit of 0%, the heater's operating output status under the current condition is recorded as a feedforward value for the next operation under the same conditions. This allows the system to reach a balanced operating state more quickly and enter the next adjustment phase. Additionally, before adjusting the heater's output power, it is necessary to determine if the system is fault-free (this can be determined by analyzing signals transmitted from components such as the compressor, water pump, and heater). If the system is fault-free, then the heater's output power can be adjusted.
[0067] Step 240: When the output power of the first heater and the output power of the second heater are adjusted, if the absolute value of the difference between the speed of the first compressor and the speed of the second compressor is greater than the preset speed threshold and continues for a preset time, then adjust the speed of the first compressor and the speed of the second compressor.
[0068] The adjustment of the speeds of the first and second compressors includes: if the speed of the first compressor is greater than the speed of the second compressor, then the speed of the first compressor is reduced; if the speed of the first compressor is less than the speed of the second compressor, then the speed of the second compressor is reduced. Specifically, Figure 6 This is a flowchart of a compressor adjustment method provided in Embodiment 2 of the present invention. (Reference) Figure 6When the absolute value of the difference between the speed of the first compressor and the speed of the second compressor is greater than the preset speed threshold and continues for a preset time, if the speed of the first compressor is less than the speed of the second compressor, the speed of the second compressor is reduced. The speed can be reduced by a calibrated value, such as 50 rpm per second. In order to prevent the system from experiencing control overshoot, the speed of the second compressor needs to be slowly adjusted and the upper limit speed of the second compressor is limited to min[9000, C1+1500] rpm (9000 rpm is the maximum speed of the compressor, and C1 is the real-time speed of the first compressor). The lower limit speed can be calibrated and is not less than 4000 rpm (calibrable). The calibration range is 4000-min[9000, C1+1500] rpm to avoid severely limiting the system capacity. Since the total heat output demand of the thermal management system remains unchanged, reducing the speed of the second compressor will automatically and slowly increase the speed of the first compressor. After a period of closed-loop adjustment, the speed of the second compressor stabilizes at C1+1500rpm (calibrable). The first and second compressors enter a new dynamic equilibrium control state, meeting the maximum output demand of the system, and the speed difference between the first and second compressors remains stable within an acceptable range. If the speed of the first compressor is lower than that of the second compressor, the speed of the first compressor is reduced. The specific process is similar to that of reducing the speed of the second compressor, and will not be repeated here. Furthermore, before adjusting the compressor speed, it is necessary to determine whether there are any faults in the system (this can be determined by the signals transmitted by components in the system such as the compressor, water pump, and heater). If there are no faults in the system, then the compressor speed can be adjusted.
[0069] It should be noted that the values of the parameters in this embodiment are only for illustrative purposes and can be determined according to actual control requirements, and are not limited here.
[0070] The control method of the thermal management system provided in this embodiment can achieve load balancing of different thermal management subsystems by sequentially adjusting the speed of the water pump, the output power of the heater (the output power of the heater in different thermal management subsystems can be adjusted simultaneously), and the speed of the compressor (the speed of the compressor in different thermal management subsystems can be adjusted simultaneously). This can improve the performance of the thermal management system, achieve load balancing quickly, minimize the differences in compressor speed between different thermal management subsystems, extend the service life of the compressor, and reduce the after-sales cost of the thermal management system.
[0071] Example 3
[0072] Figure 7 This is a structural block diagram of a control device for a thermal management system provided in Embodiment 3 of the present invention. (Reference) Figure 7The thermal management system includes a controller and at least two thermal management subsystems. Each thermal management subsystem includes a compressor, a water pump, and a heater, all of which are electrically connected to the controller. The control device of the thermal management system is integrated into the controller. The control device of the thermal management system includes an information receiving module 01 and a control module 02. The information receiving module 01 is used to receive the compressor speed information of each thermal management subsystem. The control module 02 is used to control the speed of the water pump, the output power of the heater, and the speed of the compressor in each thermal management subsystem based on the speed information, so as to balance the load of each thermal management subsystem.
[0073] Based on the above embodiments, the thermal management system includes a first thermal management subsystem and a second thermal management subsystem; the control module 02 includes a speed adjustment unit and a control unit; wherein, the speed adjustment unit is used to adjust the speed of the water pump in the first thermal management subsystem and the second thermal management subsystem if the absolute value of the difference between the speed of the compressor in the first thermal management subsystem and the speed of the compressor in the second thermal management subsystem is greater than a preset speed threshold and continues for a preset time; the control unit is used to control the output power of the heater and the speed of the compressor in the first thermal management subsystem and the second thermal management subsystem when the speed adjustment of the water pump is completed.
[0074] Based on the above embodiments, the first thermal management subsystem includes a first compressor and a first heater, and the second thermal management subsystem includes a second compressor and a second heater; the control unit includes a power regulation subunit and a speed regulation subunit; wherein, the power regulation subunit is used to adjust the output power of the first heater and the output power of the second heater if the absolute value of the difference between the speed of the first compressor and the speed of the second compressor is greater than a preset speed threshold and continues for a preset duration; the speed regulation subunit is used to adjust the speed of the first compressor and the speed of the second compressor when the output power of the first heater and the output power of the second heater have been adjusted, if the absolute value of the difference between the speed of the first compressor and the speed of the second compressor is greater than a preset speed threshold and continues for a preset duration.
[0075] Based on the above implementation, the speed regulation subunit is specifically used to control the speed of the first compressor to decrease if the speed of the first compressor is greater than the speed of the second compressor; and to control the speed of the second compressor to decrease if the speed of the first compressor is less than the speed of the second compressor.
[0076] In one embodiment, the power regulation subunit is specifically used to control the output power of the second heater to increase and the output power of the first heater to decrease if the speed of the first compressor is less than the speed of the second compressor; and to control the output power of the first heater to increase and the output power of the second heater to decrease if the speed of the first compressor is greater than the speed of the second compressor.
[0077] Optionally, the power regulation subunit is used to control the output power of the second heater to increase and the output power of the first heater to decrease. Specifically, it controls the output power of the second heater to increase by a preset first step size. When the output power of the second heater reaches a preset first power threshold, it controls the output power of the first heater to decrease by a preset second step size until the output power of the first heater reaches a preset second power threshold.
[0078] Optionally, the first thermal management subsystem includes a first compressor, a first heat release circuit water pump, and a first heat absorption circuit water pump; the second thermal management subsystem includes a second compressor, a second heat release circuit water pump, and a second heat absorption circuit water pump. When adjusting the speed of the water pumps in the first and second thermal management subsystems, the speed regulation unit specifically controls the speed of the first heat release circuit water pump to increase and the speed of the second heat release circuit water pump to decrease when the thermal management system is in heating mode, if the speed of the first compressor is less than the speed of the second compressor; and when the speed regulation of the first and second heat release circuit water pumps is complete, it controls the speed of the first heat absorption circuit water pump to increase and the speed of the second heat absorption circuit water pump to decrease.
[0079] Optionally, the control module 02 is specifically used to sequentially control the speed of the water pump, the output power of the heater, and the speed of the compressor in each thermal management subsystem. If the heater is not turned on, the control module 02 sequentially controls the speed of the water pump and the speed of the compressor in each thermal management subsystem.
[0080] The control device for the thermal management system provided in this embodiment belongs to the same inventive concept as the control method for the thermal management system provided in any embodiment of the present invention, and has corresponding beneficial effects. For technical details not covered in this embodiment, please refer to the control method for the thermal management system provided in any embodiment of the present invention.
[0081] Example 4
[0082] Figure 8 This is a schematic diagram of a thermal management system provided in Embodiment 4 of the present invention. (Reference) Figure 8 The thermal management system includes a controller and at least two thermal management subsystems. Each thermal management subsystem includes a compressor, a water pump, and a heater. The compressor, water pump, and heater are all electrically connected to the controller. The control method of the thermal management system described in any embodiment of the present invention is executed by the controller in the thermal management system. The specific process can be referred to in any of the above embodiments, and will not be repeated here.
[0083] Optionally, the number of thermal management subsystems is two.
[0084] Specifically, Figure 8The diagram illustrates two thermal management subsystems, namely the first thermal management subsystem 100 and the second thermal management subsystem 200. (See diagram for details.) Figure 8 As shown, the first thermal management subsystem 100 and the second thermal management subsystem 200 are left and right mirror images of each other. The first thermal management subsystem 100 includes a first compressor 1, a first shut-off valve 3, a first heat pump condenser 5, a first liquid storage tank 7, a first electronic expansion valve 9, a first heat pump evaporator 11, a first compressor outlet pressure sensor 13, a first compressor inlet pressure sensor 15, a first heater 17 (water heater), a first three-way valve 19, a first five-way valve 21, a first battery water pump 23, a second three-way valve 25, a first heat absorption circuit water pump 27, a first heat release circuit water pump 29, and a second five-way valve 31. The second thermal management subsystem 200 includes a second compressor 2, a second shut-off valve 4, a second heat pump condenser 6, a second liquid storage tank 8, a second electronic expansion valve 10, a second heat pump evaporator 12, a second compressor outlet pressure sensor 14, a second compressor inlet pressure sensor 16, a second heater 18 (water heater), a third three-way valve 20, a third five-way valve 22, a second battery water pump 24, a fourth three-way valve 26, a first heat absorption circuit water pump 28, a second heat release circuit water pump 30, and a fourth five-way valve 32. The thermal management system also includes a battery inlet water temperature sensor 33, a high-voltage battery pack 34, a battery outlet water temperature sensor 35, a heating core inlet temperature sensor 36, a heating core 37, a cooling core inlet temperature sensor 38, a cooling core 39, a blower 40, a motor charging module inlet water temperature sensor 41, a motor charging module 42, a motor charging module outlet water temperature sensor 43, a radiator 44, and a fan 45.
[0085] The outlet of the first compressor 1, the refrigerant circuit inlet of the first heat pump condenser 5, the refrigerant circuit outlet of the first heat pump condenser 5, the first liquid receiver 7, the first electronic expansion valve 9, the refrigerant circuit inlet of the first heat pump evaporator 11, the refrigerant circuit outlet of the first heat pump evaporator 11, and the inlet of the first compressor 1 are connected in sequence. The outlet of the second compressor 2, the refrigerant circuit inlet of the second heat pump condenser 6, the refrigerant circuit outlet of the second heat pump condenser 6, the second liquid receiver 8, the second electronic expansion valve 10, the refrigerant circuit inlet of the second heat pump evaporator 12, the refrigerant circuit outlet of the second heat pump evaporator 12, and the inlet of the second compressor 1 are connected in sequence. The water circuit inlet of the first heat pump condenser 5, the first heater 17, and one end of the first three-way valve 19 are sequentially connected. The other two ends of the first three-way valve 19 are respectively connected to one end of the third three-way valve 20 and one end of the first five-way valve 21. The other four ends of the first five-way valve 21 are respectively connected to one end of the third five-way valve 22, one end of the second three-way valve 25, the inlet of the first battery water pump 23, and one end of the second five-way valve 31. The other two ends of the second three-way valve 25 are respectively connected to the water circuit outlet of the first heat pump evaporator 11 and one end of the fourth three-way valve 26. The other two ends of the third three-way valve 20 are respectively connected to the third five-way valve 22 and the outlet of the second heater 18. The other two ends of the fourth three-way valve 26 are respectively connected to the water circuit outlet of the second heat pump evaporator 12 and the third five-way valve 22. The other four ends of the second five-way valve 31 are respectively connected to the inlet of the first heat release circuit water pump 29, one end of the fourth five-way valve 32, the outlet of the radiator 44, and the inlet of the first heat absorption circuit water pump 27. The other four ends of the third five-way valve 22 are respectively connected to the fourth three-way valve 26, the inlet of the second battery water pump 24, the fourth five-way valve 32, and the third three-way valve 20. The other four ends of the fourth five-way valve 32 are respectively connected to the inlet of the second heat release circuit water pump 30, the inlet of the second heat absorption circuit water pump 28, the inlet of the radiator 44, and the outlet. The outlet of the first battery water pump 23 is connected to the outlet of the second battery water pump 24 and to the inlet of the high-voltage battery pack 34. The connecting pipes of the first three-way valve 19 and the third three-way valve 20 are connected to the inlet of the heating core 37. The connecting pipes of the second three-way valve 25 and the fourth three-way valve 26 are connected to the inlet of the cooling core 39. The connecting pipes of the first five-way valve 21 and the third five-way valve 22 are connected to the inlet of the motor charging module 42.The connecting pipes of the second five-way valve 31 and the fourth five-way valve 32 are connected to the outlet of the high-voltage battery pack 34. The inlet of the first heat release circuit water pump 29 is connected to the inlet of the second heat release circuit water pump 30 and to the outlet of the heating core 37. The inlet of the first heat absorption circuit water pump 27 and the inlet of the first heat absorption circuit water pump 28 are connected to the outlet of the cooling core 39. The connecting pipes of the second five-way valve 31 and the fourth five-way valve 32 are connected to the outlet of the radiator 44. The inlet of the radiator 44 is connected to the outlet of the motor charging module 42. The fan 45 is located on one side of the radiator 44.
[0086] Furthermore, taking the application of a thermal management system in a vehicle as an example, the thermal management system cools or heats the vehicle's battery and heats or cools the vehicle's passenger compartment. Figure 9 This is a schematic diagram of a thermal management system in cabin cooling mode according to Embodiment 4 of the present invention. (See attached diagram.) Figure 9In the diagram, PT represents a pressure sensor and T represents a temperature sensor. In the passenger cabin cooling mode, the refrigerant in the refrigerant circuit performs work through the first compressor 1 and the second compressor 2. The first shut-off valve 3 and the second shut-off valve 4 are opened. The high-temperature and high-pressure refrigerant exchanges heat with the water circuit through the first heat pump condenser 5 and the second heat pump condenser 6, releasing heat and changing into liquid refrigerant. After flowing through the first liquid storage tank 7 and the second liquid storage tank 8, it passes through the first electronic expansion valve 9 and the second electronic expansion valve 10. The refrigerant then exchanges heat with the water circuit through the first heat pump evaporator 11 and the second heat pump evaporator 12, absorbing heat and returning to the suction port of the first compressor 1 and the second compressor 2. The water circuit is divided into two circuits. The low-temperature water circuit pumps, namely the first heat absorption circuit pump 27 and the second heat absorption circuit pump 28, pump the coolant into the first heat pump evaporator 11 and the second heat pump evaporator 12 to release heat. Then, the coolant passes through the second three-way valve 25 and the fourth three-way valve 26 to the cooling core 39. After absorbing heat from the air, the coolant reduces the outlet air temperature of the cooling core 39. Then, the coolant returns to the inlet of the first heat absorption circuit pump 27 and the second heat absorption circuit pump 28 to enter the next water cycle. The high-temperature water circuit primarily dissipates heat from the vehicle interior into the air. The heat pump water pumps, namely the first heat pump water pump 29 and the second heat pump water pump 30, pump coolant into the first heat pump condenser 5 and the second heat pump condenser 6 to absorb heat. The coolant then passes through the first heater 17, the second heater 18 (in off-state during cooling), and the hot water distribution three-way valves, namely the first three-way valve 19 and the third three-way valve 20. Through system mode switching, the five-way water valves, namely the first five-way valve 21 and the third five-way valve 22, and the motor charging module 42, the coolant reaches the radiator 44. After heat exchange with the air, the released heat lowers the water temperature, allowing it to return to the second five-way valve 31 and the fourth five-way valve 32, before flowing back into the inlets of the first heat pump water pump 29 and the second heat pump water pump 30 for the next water cycle. When the battery and passenger compartment are simultaneously cooled, the cold water flow is controlled by the cold water distribution three-way valves, namely the second three-way valve 25 and the fourth three-way valve 26, achieving closed-loop control of the different target cooling water temperatures for the battery and passenger compartment. When the battery and passenger compartment are heated simultaneously, the hot water flow rate is controlled by the hot water distribution three-way valves, namely the first three-way valve 19 and the third three-way valve 20, to achieve closed-loop control of the different heating target water temperatures of the battery and passenger compartment.
[0087] In this embodiment, the thermal management system employs two parallel thermal management subsystems to provide cooling and heating functions for the vehicle's passenger compartment and battery pack, and cooling functions for the vehicle's electric drive and charging module systems. In cooling mode, the compressor speed is controlled in a closed loop, with the target inlet water temperature for the cooling core at 2-20°C and the target inlet water temperature for the battery at 15-25°C. In heating mode, the compressor speed is controlled in a closed loop, with the target inlet water temperature for the heating core at 30-70°C and the target inlet water temperature for the battery at 35-45°C. The thermal management system uses a three-stage, step-by-step processing approach, sequentially controlling the water pump speed, heater output power, and compressor speed. This approach preserves the left-right symmetrical control strategy of the system components as much as possible, maximizing the inherent performance of each subsystem and extending the system's lifespan.
[0088] Figure 10 This is a schematic diagram of a thermal management system in battery cooling mode according to Embodiment 4 of the present invention. Figure 11 This is a schematic diagram of a thermal management system in dual cooling modes provided in Embodiment 4 of the present invention. Figure 12 This is a schematic diagram of a thermal management system in cabin heating mode according to Embodiment 4 of the present invention. Figure 13 This is a schematic diagram of a thermal management system in dual heating modes provided in Embodiment 4 of the present invention. Figure 11 The dual-cooling mode shown refers to both the passenger cabin and the battery. Figure 13 The dual heating mode shown refers to both passenger cabin and battery heating modes. (Reference) Figure 10- Figure 13 The principles behind the various working modes are similar, and will not be elaborated upon here.
[0089] The thermal management system provided in this embodiment belongs to the same inventive concept as the control method of the thermal management system provided in any embodiment of the present invention, and has corresponding beneficial effects. For technical details not covered in this embodiment, please refer to the control method of the thermal management system provided in any embodiment of the present invention.
[0090] Example 5
[0091] Embodiment 5 of the present invention provides a computer-readable storage medium storing a computer program thereon. When executed by a controller, the program implements the control method of the thermal management system provided in this embodiment of the present invention. The thermal management system includes a controller and at least two thermal management subsystems. Each thermal management subsystem includes a compressor, a water pump, and a heater. The compressor, water pump, and heater are all electrically connected to the controller. The control method of the thermal management system is executed by the controller, and the control method of the thermal management system includes:
[0092] Receive compressor speed information from each thermal management subsystem;
[0093] Based on the rotational speed information, the rotational speed of the water pumps, the output power of the heaters, and the rotational speed of the compressors in each thermal management subsystem are controlled to balance the load of each thermal management subsystem.
[0094] The computer storage medium of this invention can be any combination of one or more computer-readable media. A computer-readable medium can be a computer-readable signal medium or a computer-readable storage medium. A computer-readable storage medium can be, for example,—but not limited to—an electrical, magnetic, optical, electromagnetic, infrared, or semiconductor system, apparatus, or device, or any combination thereof. More specific examples of computer-readable storage media (a non-exhaustive list) include: an electrical connection having one or more wires, a portable computer disk, a hard disk, random access memory (RAM), read-only memory (ROM), erasable programmable read-only memory (EPROM or flash memory), optical fiber, portable compact disk read-only memory (CD-ROM), optical storage device, magnetic storage device, or any suitable combination thereof. In this document, a computer-readable storage medium can be any tangible medium that contains or stores a program that can be used by or in conjunction with an instruction execution system, apparatus, or device.
[0095] Computer-readable signal media may include data signals propagated in baseband or as part of a carrier wave, carrying computer-readable program code. Such propagated data signals may take various forms, including but not limited to electromagnetic signals, optical signals, or any suitable combination thereof. Computer-readable signal media may also be any computer-readable medium other than computer-readable storage media, capable of sending, propagating, or transmitting programs for use by or in connection with an instruction execution system, apparatus, or device.
[0096] Program code contained on a computer-readable medium may be transmitted using any suitable medium, including—but not limited to—wireless, wire, optical fiber, RF, etc., or any suitable combination thereof.
[0097] Computer program code for performing the operations of this invention can be written in one or more programming languages or a combination thereof, including object-oriented programming languages such as Java, Smalltalk, and C++, as well as conventional procedural programming languages such as "C" or similar programming languages. The program code can be executed entirely on the user's computer, partially on the user's computer, as a standalone software package, partially on the user's computer and partially on a remote computer, or entirely on a remote computer or terminal. In cases involving remote computers, the remote computer can be connected to the user's computer via any type of network—including a local area network (LAN) or a wide area network (WAN)—or can be connected to an external computer (e.g., via the Internet using an Internet service provider).
[0098] Note that the above description is merely a preferred embodiment of the present invention and the technical principles employed. Those skilled in the art will understand that the present invention is not limited to the specific embodiments described herein, and various obvious changes, rearrangements, combinations, and substitutions can be made without departing from the scope of protection of the present invention. Therefore, although the present invention has been described in detail through the above embodiments, the present invention is not limited to the above embodiments, and may include many other equivalent embodiments without departing from the concept of the present invention, the scope of which is determined by the scope of the appended claims.
Claims
1. A control method for a thermal management system, characterized in that, The thermal management system includes a controller and at least two thermal management subsystems. Each thermal management subsystem includes a compressor, a water pump, and a heater. The compressor, the water pump, and the heater are all electrically connected to the controller. The control method of the thermal management system is executed by the controller, and the control method of the thermal management system includes: Receive compressor speed information from each of the aforementioned thermal management subsystems; Based on the rotation speed information, the rotation speed of the water pump, the output power of the heater, and the rotation speed of the compressor in each of the thermal management subsystems are controlled to balance the load of each of the thermal management subsystems; The thermal management system includes a first thermal management subsystem and a second thermal management subsystem; The step of controlling the speed of the water pump, the output power of the heater, and the speed of the compressor in each of the thermal management subsystems based on the speed information includes: If the absolute value of the difference between the compressor speed in the first thermal management subsystem and the compressor speed in the second thermal management subsystem is greater than a preset speed threshold and continues for a preset duration, then the speed of the water pumps in the first thermal management subsystem and the second thermal management subsystem will be adjusted. When the pump speed regulation is completed, the output power of the heater and the speed of the compressor in the first thermal management subsystem and the second thermal management subsystem are controlled. The first thermal management subsystem includes a first compressor and a first heater, and the second thermal management subsystem includes a second compressor and a second heater; The control of the output power of the heaters and the speed of the compressors in the first thermal management subsystem and the second thermal management subsystem includes: If the absolute value of the difference between the speed of the first compressor and the speed of the second compressor is greater than the preset speed threshold and continues for the preset duration, then the output power of the first heater and the output power of the second heater are adjusted. When the output power of the first heater and the output power of the second heater are adjusted, if the absolute value of the difference between the speed of the first compressor and the speed of the second compressor is greater than the preset speed threshold and continues for the preset duration, then the speed of the first compressor and the speed of the second compressor are adjusted.
2. The control method for the thermal management system according to claim 1, characterized in that, The adjustment of the speed of the first compressor and the speed of the second compressor includes: If the speed of the first compressor is greater than the speed of the second compressor, then the speed of the first compressor is controlled to decrease; If the speed of the first compressor is less than the speed of the second compressor, then the speed of the second compressor is controlled to decrease.
3. The control method for the thermal management system according to claim 2, characterized in that, The adjustment of the output power of the first heater and the output power of the second heater includes: If the speed of the first compressor is less than the speed of the second compressor, then the output power of the second heater is increased and the output power of the first heater is decreased. If the speed of the first compressor is greater than the speed of the second compressor, then the output power of the first heater is increased and the output power of the second heater is decreased.
4. The control method for the thermal management system according to claim 3, characterized in that, The control of increasing the output power of the second heater and decreasing the output power of the first heater includes: The output power of the second heater is controlled to increase by a preset first step size. When the output power of the second heater reaches a preset first power threshold, the output power of the first heater is controlled to decrease by a preset second step size until the output power of the first heater reaches a preset second power threshold.
5. The control method for the thermal management system according to claim 1, characterized in that, The first thermal management subsystem includes a first compressor, a first heat release circuit water pump, and a first heat absorption circuit water pump; the second thermal management subsystem includes a second compressor, a second heat release circuit water pump, and a second heat absorption circuit water pump. Adjusting the speed of the water pumps in the first thermal management subsystem and the second thermal management subsystem includes: If the speed of the first compressor is less than the speed of the second compressor, then when the thermal management system is in heating mode, the speed of the first heat release circuit water pump is increased and the speed of the second heat release circuit water pump is decreased. When the speed adjustment of the first heat release circuit water pump and the second heat release circuit water pump is completed, the speed of the first heat absorption circuit water pump is increased and the speed of the second heat absorption circuit water pump is decreased.
6. The control method for the thermal management system according to claim 1, characterized in that, The control of the pump speed, heater output power, and compressor speed in each of the thermal management subsystems includes: The speed of the water pump, the output power of the heater, and the speed of the compressor in each of the thermal management subsystems are controlled sequentially. If the heater is not turned on, the speed of the water pump and the speed of the compressor in each of the thermal management subsystems are controlled sequentially.
7. A thermal management system, characterized in that, include: The controller and at least two thermal management subsystems, each of which includes a compressor, a water pump, and a heater, wherein the compressor, the water pump, and the heater are all electrically connected to the controller, and the control method as described in any one of claims 1-6 is executed by the controller.
8. The thermal management system according to claim 7, characterized in that, The number of thermal management subsystems is two.