Thermal management system for electric truck and electric truck

Abstract

The invention relates to a thermal management system for an electric truck. The thermal management system comprises a control module; a plurality of heat pump modules, the plurality of heat pump modules being identically configured, each of the plurality of heat pump modules including one or more controlled devices and one interface unit; wherein the interface unit in each heat pump module is connected with the control module through a bus, the control module transmits control information to the interface unit in each heat pump module, and the interface unit analyzes information for the corresponding controlled equipment from the control information according to an identifier uniquely associated with the type of the controlled equipment; and wherein the interface unit transmits information for the respective controlled device to the respective controlled device. The invention further relates to an electric truck with the thermal management system.

Description

Technical Field

[0001] The present invention relates to a thermal management system for an electric truck, in particular an electric heavy-duty truck. The present invention also relates to an electric truck having the thermal management system, in particular an electric heavy-duty truck. Background Art

[0002] With the rapid development of new energy heavy-duty truck technology, more urgent and severe challenges are posed to thermal management control technology suitable for large loads, low energy consumption and high stability.

[0003] The capacity of a single heat pump module is limited by the pump capacity and the flow resistance of the circuit. It is difficult for a single heat pump module to meet the large water flow requirements of the vehicle system. In addition, the capacity of a single heat pump module is also limited by the capacity of the compressor and the expansion valve. The cooling or heating capacity of a single heat pump module is difficult to meet the requirements of a heavy-duty truck with a large load.

[0004] In addition, the thermal management system of heavy-duty trucks is significantly different from that of passenger cars, so it is difficult to transfer the thermal management system of passenger cars to heavy-duty trucks. Summary of the invention

[0005] The technical problem to be solved by the present invention is to at least partially overcome the above-mentioned technical defects to realize a stable and efficient thermal management system that meets the thermal requirements of the entire electric truck and has expansion capabilities.

[0006] The present invention relates to a thermal management system for an electric truck, the thermal management system comprising: a control module; a plurality of heat pump modules, the plurality of heat pump modules being constructed identically, each of the plurality of heat pump modules comprising one or more controlled devices and an interface unit; wherein the interface unit in each heat pump module is respectively connected to the control module via a bus, the control module transmits control information to the interface unit in each heat pump module respectively, the interface unit parses information for the corresponding controlled device from the control information according to an identifier uniquely associated with the type of the controlled device; and wherein the interface unit transmits the information for the corresponding controlled device to the corresponding controlled device.

[0007] The thermal management system of the present invention realizes a modular design of heat pumps, especially a dual heat pump module system. Compared with a single heat pump module system, a dual heat pump module system is more complex. It not only has the working function of a single heat pump, but also has the collaborative working function of dual heat pump modules, so that the dual heat pump module system can operate stably and efficiently in all scenarios of the whole vehicle to meet the thermal needs of the whole vehicle. Like the traditional single heat pump module system, the dual heat pump module system can realize the transfer, recovery, heat storage and reuse of the heat of the whole vehicle, thereby reducing energy consumption. However, the capacity of a single heat pump system is difficult to efficiently meet the super-large heat load requirements of various systems of heavy-duty trucks. The dual heat pump module solves the problems of high heat load and high energy consumption of new energy heavy-duty trucks, and further promotes the development of new energy heavy-duty truck technology. The dual heat pump module control system proposed in the present invention can symmetrically control the first coolant loop and the second coolant loop. Therefore, in most scenarios, the dual heat pump modules are synchronously operated at the same frequency and speed, and the heat demand of the whole vehicle is evenly shared by the two heat pump modules. This not only doubles the system capacity, but also allows the components of each heat pump module to work in a more efficient range for a long time, thereby improving the service life of the components of the heat pump module. In the scope of the present invention, "same" for parameters such as speed, temperature, and opening refers to a deviation of no more than 5%.

[0008] In addition, because it is difficult to make the actual vehicle components or layout of the two heat pump modules completely consistent or symmetrical, it is also difficult to make the water system performance completely consistent, which will affect the capacity output and control stability of the refrigerant circuit. According to the present invention, the refrigerant circuit of each module is independently closed-loop controlled within the module, which can solve the technical problem that the instability of the water circuit affects the control stability of the refrigerant circuit. Because the two refrigerant circuits have the same control target, through the closed-loop adjustment of each refrigerant circuit, the thermal management requirements of the entire vehicle are finally achieved in a coordinated manner.

[0009] In an embodiment according to the present invention, the multiple heat pump modules include a first heat pump module and a second heat pump module; the multiple controlled devices in the first heat pump module form a first coolant circuit and a first refrigerant circuit, the interface unit in the first heat pump module is a first interface unit, and the control module is connected to the first interface unit through a first bus; the multiple controlled devices in the second heat pump module form a second coolant circuit and a second refrigerant circuit, the interface unit in the second heat pump module is a second interface unit, and the control module is connected to the second interface unit through a second bus; and wherein the first refrigerant circuit and the second refrigerant circuit are independent of each other, and the first coolant circuit and the second coolant circuit are connected in parallel.

[0010] In an embodiment according to the present invention, the interface unit in the first heat pump module is connected to the control module via a first bus, and the control module transmits control information to the interface unit in the first heat pump module via the first bus; and the interface unit in the second heat pump module is connected to the control module via a second bus, and the control module transmits control information to the interface unit in the second heat pump module via the second bus.

[0011] In an embodiment according to the present invention, the first coolant circuit includes a first heat exchanger, and a first multi-way valve and a first pump as controlled devices; the first refrigerant circuit includes a first condenser, a first evaporator, a first compressor and a first expansion valve as controlled devices, wherein the first heat exchanger is coupled to the first condenser and / or the first evaporator; and the second coolant circuit includes a second heat exchanger, and a second multi-way valve and a second pump as controlled devices, and the second refrigerant circuit includes a second condenser, a second evaporator, a second compressor and a second expansion valve as controlled devices, wherein the second heat exchanger is coupled to the second condenser and / or the second evaporator.

[0012] In an embodiment according to the present invention, the first interface unit sends information resolved according to the first identifier to the first multi-way valve, information resolved according to the second identifier to the first pump, information resolved according to the third identifier to the first compressor, and information resolved according to the fourth identifier to the first expansion valve; and the second interface unit sends information resolved according to the first identifier to the second multi-way valve, information resolved according to the second identifier to the second pump, information resolved according to the third identifier to the second compressor, and information resolved according to the fourth identifier to the second expansion valve.

[0013] In an embodiment of the present invention, according to target requirements, the control module uses the information resolved according to the first identifier sent by the first interface unit to adjust the opening of the first multi-way valve, and uses the information resolved according to the second identifier sent by the first interface unit to adjust the speed of the first pump; and the control module uses the information resolved according to the first identifier sent by the second interface unit to adjust the opening of the second multi-way valve, and uses the information resolved according to the second identifier sent by the second interface unit to adjust the speed of the second pump; wherein the speed of the first pump and the speed of the second pump are adjusted so that the coolant flow of the first heat pump module and the second heat pump module are the same.

[0014] In an embodiment of the present invention, 2 to 10 seconds before the first multi-way valve is switched, the rotational speed of the first pump first drops to the minimum rotational speed, and then returns to normal operation after the switching of the first multi-way valve is completed; similarly, 2 to 10 seconds before the second multi-way valve is switched, the rotational speed of the second pump first drops to the minimum rotational speed, and then returns to normal operation after the switching of the second multi-way valve is completed.

[0015] In an embodiment of the present invention, according to the same target requirements, the control module uses the information resolved according to the fourth identifier and sent by the first interface unit to adjust the speed of the first compressor, and uses the information resolved according to the sixth identifier and sent by the first interface unit to adjust the opening of the first expansion valve; and uses the information resolved according to the fourth identifier and sent by the second interface unit to adjust the speed of the second compressor, and uses the information resolved according to the sixth identifier and sent by the second interface unit to adjust the opening of the second expansion valve.

[0016] In an embodiment of the present invention, the control module includes a battery thermal management unit, an electric drive and electronic control thermal management unit, an air conditioning thermal management unit, a thermal management mode selection unit and a unit capacity allocation unit, wherein the thermal management mode selection unit selects a thermal management mode according to the requirements of the battery thermal management unit, the electric drive and electronic control thermal management unit and the air conditioning thermal management unit, and the unit capacity allocation unit allocates output capacity to the first heat pump module and allocates output capacity to the second heat pump module according to the selected thermal management mode.

[0017] In an embodiment of the present invention, the first coolant circuit and the second coolant circuit are connected in parallel with the vehicle coolant circuit of the electric truck through a valve device, wherein the valve device is a three-way valve, wherein the vehicle coolant circuit includes a battery pack coolant circuit and an electric drive electronic control coolant circuit, wherein the first multi-way valve and the second multi-way valve are respectively connected to the battery pack coolant circuit and / or the electric drive electronic control coolant circuit. The valve device described herein is a three-way valve, and may also be other types of valves according to different scenarios. Here, the series connection of the dual heat pump module system and the battery pack coolant circuit and / or the electric drive electronic control coolant circuit can be realized by the first multi-way valve and the second multi-way valve. For the first multi-way valve and the second multi-way valve, the temperature and flow rate of the coolant refluxed in the coolant circuit are different, so the opening of the first multi-way valve and the second multi-way valve can be adjusted, and the speed of the first pump and the second pump can be adjusted when necessary to achieve substantially the same coolant flow rate. Similarly, according to the allocated capacity, the compressor and expansion valve in each module can also be adjusted to provide different cooling capacity or heating capacity to meet the needs of the whole vehicle. Thus, independent control of the refrigerant circuits provides compensation and balancing for capacity differences between the heat pump modules (eg due to long-term use).

[0018] Another aspect of the present invention also relates to an electric truck having a thermal management system according to the present invention. The embodiments and advantages of the thermal management system are naturally also applicable to the electric truck according to the present invention.

[0019] In general, the dual heat pump module system control architecture proposed in the present invention provides a new control idea for the thermal management control technology of new energy heavy-duty trucks. The development of more efficient thermal management technology makes it possible for new energy heavy-duty trucks to achieve greater power performance, greater charging power, and higher energy efficiency requirements. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] The above-mentioned features and advantages of the present invention and the methods for achieving them are described in detail below in conjunction with specific embodiments and with reference to the accompanying drawings, but the features of the present invention are not limited to the features of the specific embodiments. In the accompanying drawings: Figure 1 A working principle diagram of a thermal management system according to the present invention is shown; Figure 2 A schematic diagram showing a thermal management system according to the present invention; and Figure 3 A schematic block diagram of a thermal management system according to the present invention is shown. DETAILED DESCRIPTION

[0021] In order to make the purpose, technical solution and advantages of the embodiment of the present invention clearer, the technical solution of the embodiment of the present invention will be clearly and completely described below in conjunction with the accompanying drawings of the embodiment of the present invention. Obviously, the described embodiment is a part of the embodiment of the present invention, not all of the embodiments. Based on the described embodiment of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0022] Unless otherwise defined, the technical or scientific terms used herein shall have the usual meanings understood by persons of ordinary skill in the field to which the invention belongs. The words "first", "second" and similar terms used in the patent application specification and claims of the present invention do not indicate any order, quantity or importance, but are only used to distinguish different components. Words such as "include" or "comprise" mean that the elements or objects appearing before the word include the elements or objects listed after the word and their equivalents, without excluding other elements or objects. "Front", "back", "upper", "lower", "left", "right" and the like are only used to indicate relative positional relationships. When the absolute position of the described object changes, the relative positional relationship may also change accordingly.

[0023] The drawings in the present invention are not drawn strictly according to the actual scale, and are regarded as provisions of the present invention only when the size and position relationship are clearly stated, and the specific size and quantity of each structure can be determined according to actual needs.

[0024] Figure 1 The working principle diagram of the thermal management system according to the present invention is shown. Starting from the power supply P being powered on (the whole vehicle being powered on), the requirements of the battery thermal management unit 10, the electric drive and electronic control thermal management unit 20 and the air conditioning thermal management unit 30 are calculated or detected respectively, and then the current thermal management mode is obtained in the thermal management mode selection unit 40. The thermal management mode may include multiple modes, such as battery cooling mode, air conditioning heating mode, air conditioning refrigeration mode, etc., or a combination of several modes. The module capacity allocation unit 50 allocates output capacity to each heat pump module according to the selected thermal management mode, and sends control information to each heat pump module respectively. Each control information is used to control the operation of each controlled device in the corresponding heat pump module to achieve the allocated output capacity.

[0025] The battery thermal management unit 10 , the electric drive and electric control thermal management unit 20 , the air conditioning thermal management unit 30 , the thermal management mode selection unit 40 and the module capacity allocation unit 50 together constitute a control module 3000 .

[0026] exist Figure 1 Three heat pump modules are schematically shown in Figure 2 ), these heat pump modules can be constructed identically or expanded to four, five or more. Figure 1 In the schematic diagram of , three heat pump modules are shown in order to reflect the scalability. The first heat pump module, the second heat pump module and the third heat pump module are constructed identically, and corresponding components have corresponding reference numerals.

[0027] exist Figure 2 In the embodiment of the present invention, the thermal management system has only two heat pump modules, namely, a first heat pump module 100 and a second heat pump module 200. The first heat pump module 100 includes a first coolant circuit and a first refrigerant circuit. The first coolant circuit includes a first multi-way valve 104, a first pump 106, a first heat exchanger 108 and a first heater 118, and the first refrigerant circuit includes a first compressor 110, a first condenser 112, a first expansion valve 114 and a first evaporator, wherein the first heat exchanger 108 is coupled to the first evaporator.

[0028] The second heat pump module 200 includes a second coolant circuit and a second refrigerant circuit. The second coolant circuit includes a second multi-way valve 204, a second pump 206, a second heat exchanger 208 and a second heater 218. The second refrigerant circuit includes a second compressor 210, a second condenser 212, a second expansion valve 214 and a second evaporator, wherein the second heat exchanger 208 is coupled to the second evaporator. Figure 2 The first heat pump module 100 and the second heat pump module 200 shown in FIG. 1 correspond to each other. Figure 1 The third heat pump module in the embodiment includes a third multi-way valve 304 , a third pump 306 , a third compressor 310 , a third expansion valve 314 and a third heater 318 .

[0029] The first coolant circuit and the second coolant circuit are connected in parallel through the three-way valve 12 and are connected to the whole vehicle coolant circuit of the electric truck.

[0030] The module capacity allocation unit 50 allocates output capacity to the first heat pump module 100, the second heat pump module 200 and the possible third heat pump module according to the selected thermal management mode, and sends control information to the first heat pump module 100, the second heat pump module 200 and the possible third heat pump module respectively. Each control information is used to control each controlled device in the corresponding heat pump module, that is, a multi-way valve, a pump, a compressor, an expansion valve and a heater, etc. to achieve the allocated output capacity, thereby meeting various requirements.

[0031] Here, the coolant demand unit 60 obtains or uses the heat (in the present invention, the heat can also be cold) of the coolant provided by the first pump 106, the second pump 206 and the third pump 306, and feeds back the relevant parameters of the coolant demand unit 60 (such as battery temperature, etc.) to the control module. In addition, the multi-way valve mode demand unit 70 obtains the multi-way valve mode of the first multi-way valve 104, the second multi-way valve 204 and the third multi-way valve 304, and feeds back its own demand to the control module. In addition, the refrigerant demand unit 80 obtains the heat of the refrigerant side provided by the first compressor 110, the second compressor 210, the third compressor 310 and the first expansion valve 114, the second expansion valve 214, and the third expansion valve 314, and sends its own related parameters to the control module. The heater demand unit 90 obtains the heat of the coolant provided by the first heater 118, the second heater 218 and the third heater 318, and sends its own related parameters to the control module.

[0032] The relevant parameters of the coolant demand unit 60, the multi-way valve mode demand unit 70, the refrigerant demand unit 80 and the heater demand unit 90 are collected and fed back to the control module for recalculating the demands of the battery thermal management unit 10, the electric drive and electronic control thermal management unit 20 and the air conditioning thermal management unit 30, and continuing to complete the work of demand judgment and capacity allocation, so that the thermal management system can accurately allocate the capacity of each module and operate efficiently and stably.

[0033] Furthermore, in the present invention, the demand of the entire vehicle can be obtained by only monitoring the coolant demand unit 60, the multi-way valve mode demand unit 70, the refrigerant demand unit 80 and the heater demand unit 90.

[0034] Combination Figure 2 , the present invention is explained in a specific multi-way valve mode or thermal management mode. The first multi-way valve 104 and the second multi-way valve 204 shown here are only schematic (i.e., no interface with other systems is shown), because the multi-way valve is also connected to other circuits for cooling or heating other systems. For example, the battery cooling mode is selected here, the demand system 14 is a battery pack here, and the multi-way valve is controlled so that the coolant flows through the battery pack and directly returns to the heat pump module without passing through other systems. During operation, the temperature of the battery pack is detected, which can be completed in the battery thermal management unit 10, and then the battery cooling mode is selected in the thermal management mode selection unit 40 according to the measured temperature, and then the control information is sent to the first heat pump module 100 and the second heat pump module 200 respectively according to the mode (in the module capacity allocation unit 50). The control information for the first heat pump module 100 is parsed to form information for controlling the first compressor 110 and information for controlling the first expansion valve 114, information for controlling the first multi-way valve 104, and information for controlling the first pump 106. The control information for the second heat pump module 200 is parsed to form information for controlling the second compressor 210, information for controlling the second expansion valve 214, information for controlling the second multi-way valve 204, and information for controlling the second pump 206. Specifically, the speed of the first compressor and the opening of the first expansion valve 114 are controlled, and the speed of the second compressor 210 and the opening of the second expansion valve 214 are controlled. At the same time, according to the target demand, the opening of the first multi-way valve 104 and the speed of the first pump 106 are adjusted, and the opening of the second multi-way valve 204 and the speed of the second pump 206 are adjusted, wherein the speed of the first pump 106 and the speed of the second pump 206 are adjusted so that the coolant flow of the first heat pump module 100 and the second heat pump module 200 is the same. In addition, the compressor and the expansion valve can be adjusted so that the coolant passing through the heat exchanger has the same temperature. Thus, the two modules can work in a balanced manner and ensure that the output capacity is basically the same.

[0035] In addition, Figure 2 A variation can also be produced based on the battery heating mode. Figure 2 The difference is that the first heat exchanger can be coupled to the first condenser, so that the coolant absorbs heat from the first condenser and is heated, and the first heater 118 can assist in heating the coolant, so that the coolant can heat the battery. Similarly, the second heat exchanger can be coupled to the second condenser at this time, so that the coolant absorbs heat from the second condenser and is heated, and the second heater 218 also assists in heating the coolant.

[0036] Figure 3 A schematic block diagram of a thermal management system according to the present invention is shown. A control module 3000 in the thermal management system is connected to a first heat pump module 100 via a first bus 301 and sends first control information to the first heat pump module 100 via the first bus 301. A control module 3000 in the thermal management system is connected to a second heat pump module 200 via a second bus 302 and sends second control information to the second heat pump module 200 via the second bus 302. In the present invention, the first bus 301 is particularly connected to a first interface unit 3100 in the first heat pump module 100. The first interface unit 3100 parses information for each controlled device in the first heat pump module 100 from the first control information. The second interface unit 3200 parses information for each controlled device in the second heat pump module 200 from the second control information.

[0037] In the present invention, Figure 2 or Figure 3 As shown, the first heat pump module 100 and the second heat pump module 200 have exactly the same construction including exactly the same controlled devices.

[0038] In the prior art, the control module 3000 is connected to an interface unit via a bus, and the interface unit is responsible for parsing the control information sent by the control module 3000 and generating information for the corresponding controlled devices. In the case where there are 6 controlled devices, the only interface unit is designed to parse out the information for the 6 controlled devices. If the number or type of the controlled devices changes, the interface unit needs to be redesigned. For example, in the case where there are 12 controlled devices, the only interface unit is designed to parse out the information for the 12 controlled devices. This greatly increases the workload of the designers of the interface unit.

[0039] In the present invention, based on the fact that each heat pump module includes exactly the same controlled device, an interface unit can be designed for a known controlled device. In the case where multiple heat pump modules are required, the interface unit can be reused without being redesigned. This reduces the workload of the interface unit designer and simplifies the design of the thermal management system.

[0040] In the present invention, the control module 3000 is connected to the first interface unit 3100 via an independent first bus 301. Control information for the first heat pump module 100 is transmitted only via the first bus 301. Control information for the second heat pump module 200 is transmitted only via the second bus 302. In an embodiment according to the present invention, the bus can be configured as a CAN bus or a LIN bus, for example.

[0041] The first interface unit 3100 and the second interface unit 3200 parse the control information to obtain information for the corresponding controlled device according to the identifier uniquely associated with the type of the controlled device. Figure 3 In the embodiment shown. The first identifier ID1 is associated with the multi-way valve, and the interface unit can parse out information about the multi-way valve according to the first identifier ID1; the second identifier ID2 is associated with the pump, and the interface unit can parse out information about the pump according to the second identifier ID2; the third identifier ID3 is associated with the compressor, and the interface unit can parse out information about the compressor according to the third identifier ID3; the fourth identifier ID4 is associated with the expansion valve, and the interface unit can parse out information about the expansion valve according to the fourth identifier ID4. Such interface units are multiplexed as the first interface unit 3100 and the second interface unit 3200.

[0042] In the case where a thermal management system includes two or even more heat pump modules, the interface unit does not need to be redesigned. In other words, the interface units in each heat pump module are designed identically. The control information received by each interface unit through the corresponding bus is only used for each controlled device in this heat pump module. The control information is, for example, a string of data, which includes multiple data frames. Each data frame contains a unique identifier (ID). The interface unit parses the corresponding data frame according to the identifier (ID), and the data in the data frame forms a control command for the corresponding controlled device. The association relationship between the identifier (ID) and the controlled device is pre-defined in the interface module, and this association relationship is the same in each interface module.

[0043] In the embodiment of the present invention, the control module 3000 can, for example, adjust the opening of the first multi-way valve 104 according to the target demand using the information parsed according to the first identifier D1 issued by the first interface unit 3100, and adjust the speed of the first pump 106 according to the information parsed according to the second identifier ID2 issued by the first interface unit 3100. The control module 3000 can, for example, adjust the opening of the second multi-way valve 204 according to the target demand using the information parsed according to the first identifier ID1 issued by the second interface unit 3200, and adjust the speed of the second pump 206 according to the information parsed according to the second identifier ID2 issued by the second interface unit 3200. The speed of the first pump and the speed of the second pump are adjusted so that the coolant flow of the first heat pump module 100 and the second heat pump module 200 are the same.

[0044] It is currently known that the water circuit of the integrated heat pump system is relatively complex, and common problems include heat mixing between systems and water circuit backflow that does not meet the expected design. The dual heat pump module integrated system exacerbates the complexity of the water circuit, which not only places high design requirements on product design, but also poses great challenges to system control. Taking into account the actual layout environment of the entire vehicle, the dual heat pump module system cannot be strictly symmetrical in physical structure, and there are certain differences in the pipelines. When these differences are large, it will affect the actual water channel flow resistance of the two modules, resulting in a large difference in the water flow of the two modules, and even the risk of water mixing between the two modules. Unexpected flow direction will not only cause energy loss, but also affect the thermal management function; the large difference in water flow between the two modules will also lead to a large difference in the output capacity of the two modules. Long-term differences will cause the module with larger output capacity to consume life faster. In summary of the above problems, by collaboratively adjusting the speed of the pump of each module or the opening of the multi-way valve of each module, the water flow performance of the two modules in each system mode can be monitored separately, and the pump speed can be calibrated to not only meet the flow requirements of the entire vehicle system but also be basically equal. The balance of water flow can ensure that the output capacity of the two modules is basically consistent and solve the above-mentioned problems.

[0045] In an embodiment of the present invention, 2 to 10 seconds before the first multi-way valve is switched, the rotational speed of the first pump first drops to the minimum rotational speed, and then returns to normal operation after the first multi-way valve is switched; similarly, 2 to 10 seconds before the second multi-way valve is switched, the rotational speed of the second pump first drops to the minimum rotational speed, and then returns to normal operation after the second multi-way valve is switched.

[0046] When the mode multi-way valve is switched, the water flow and direction during the switching process are unexpected. The switching time of the multi-way valve is generally 2 to 10 seconds. It is inevitable that there will be water mixing between systems during the switching process, causing heat loss. The dual heat pump module system has a larger flow rate, and the heat loss during the switching process is more serious. In order to reduce the heat loss during the switching process, each module requires coordinated control between parts. Before the multi-way valve has a switching requirement, the pump speed in the coolant circuit is reduced to the minimum speed in advance. After the multi-way valve is switched, the pump resumes normal operation. The coordinated control between parts minimizes heat loss without affecting the heat dissipation requirements of each system.

[0047] In the embodiment of the present invention, the control module 3000 adjusts the speed of the first compressor 110 according to the same target demand using the information parsed according to the third identifier ID3 sent by the first interface unit 3100, and adjusts the opening of the first expansion valve 114 according to the information parsed according to the fourth identifier ID4 sent by the first interface unit 3100. The control module 3000 adjusts the speed of the second compressor 210 according to the same target demand using the information parsed according to the third identifier ID3 sent by the second interface unit 3200, and adjusts the opening of the second expansion valve 214 according to the information parsed according to the fourth identifier ID4 sent by the second interface unit 3200.

[0048] Although at least one exemplary implementation has been described in the foregoing overview and detailed description, it should be appreciated that a large number of variations exist. It should also be appreciated that the exemplary implementation is merely illustrative and should not be considered as limiting in any way the scope, applicability, and configuration of the device according to the present invention. More specifically, the description of the specific implementation is intended to provide a professional with guidance for implementing at least one exemplary implementation, and various modifications may be made to the functionality and layout of the components described without departing from the scope of protection defined by the claims and equivalent feature combinations.

Claims

1. A thermal management system for an electric truck, characterized in that: The thermal management system comprises: Control module; a plurality of heat pump modules, the plurality of heat pump modules being identically constructed, each of the plurality of heat pump modules comprising one or more controlled devices and an interface unit; wherein the interface unit in each heat pump module is connected to the control module via a bus, the control module transmits control information to the interface unit in each heat pump module, and the interface unit parses information for the corresponding controlled device from the control information according to an identifier uniquely associated with the type of the controlled device; and The interface unit transmits information for the corresponding controlled device to the corresponding controlled device.

2. The thermal management system according to claim 1, characterized in that: The plurality of heat pump modules include a first heat pump module and a second heat pump module; The plurality of controlled devices in the first heat pump module form a first coolant loop and a first refrigerant loop, the interface unit in the first heat pump module is a first interface unit, and the control module is connected to the first interface unit via a first bus; The plurality of controlled devices in the second heat pump module form a second coolant loop and a second refrigerant loop, the interface unit in the second heat pump module is a second interface unit, and the control module is connected to the second interface unit via a second bus; and The first refrigerant circuit and the second refrigerant circuit are independent of each other, and the first coolant circuit and the second coolant circuit are connected in parallel.

3. The thermal management system according to claim 2, characterized in that: The interface unit in the first heat pump module is connected to the control module via a first bus, and the control module transmits control information to the interface unit in the first heat pump module via the first bus; and the interface unit in the second heat pump module is connected to the control module via a second bus, and the control module transmits control information to the interface unit in the second heat pump module via the second bus.

4. The thermal management system according to claim 2, characterized in that: The first coolant circuit includes a first heat exchanger, and a first multi-way valve and a first pump as controlled devices; the first refrigerant circuit includes a first condenser, a first evaporator, a first compressor and a first expansion valve as controlled devices, wherein the first heat exchanger is coupled to the first condenser and / or the first evaporator; and The second coolant circuit includes a second heat exchanger, and a second multi-way valve and a second pump as controlled devices, and the second refrigerant circuit includes a second condenser, a second evaporator, a second compressor and a second expansion valve as controlled devices, wherein the second heat exchanger is coupled to the second condenser and / or the second evaporator.

5. The thermal management system according to claim 2, characterized in that: The first interface unit sends information resolved according to the first identifier to the first multi-way valve, information resolved according to the second identifier to the first pump, information resolved according to the third identifier to the first compressor, and information resolved according to the fourth identifier to the first expansion valve; and The second interface unit sends the information resolved according to the first identifier to the second multi-way valve, the information resolved according to the second identifier to the second pump, the information resolved according to the third identifier to the second compressor, and the information resolved according to the fourth identifier to the second expansion valve.

6. The thermal management system according to claim 5, characterized in that: According to the target demand, the control module adjusts the opening of the first multi-way valve using the information resolved according to the first identifier sent by the first interface unit, and adjusts the speed of the first pump using the information resolved according to the second identifier sent by the first interface unit; and The control module adjusts the opening of the second multi-way valve using the information parsed according to the first identifier sent by the second interface unit, and adjusts the speed of the second pump using the information parsed according to the second identifier sent by the second interface unit; The rotation speed of the first pump and the rotation speed of the second pump are adjusted so that the coolant flow rates of the first heat pump module and the second heat pump module are the same.

7. The thermal management system according to claim 6, characterized in that: 2 to 10 seconds before the first multi-way valve is switched, the speed of the first pump first drops to the minimum speed, and then returns to normal operation after the first multi-way valve is switched; similarly, 2 to 10 seconds before the second multi-way valve is switched, the speed of the second pump first drops to the minimum speed, and then returns to normal operation after the second multi-way valve is switched.

8. The thermal management system according to claim 2, characterized in that: According to the same target requirement, the control module adjusts the speed of the first compressor using the information parsed according to the fourth identifier sent by the first interface unit, and adjusts the opening of the first expansion valve using the information parsed according to the sixth identifier sent by the first interface unit; and The rotation speed of the second compressor is adjusted using the information resolved according to the fourth identifier sent by the second interface unit, and the opening degree of the second expansion valve is adjusted using the information resolved according to the sixth identifier sent by the second interface unit.

9. The thermal management system according to claim 2, characterized in that: The control module includes a battery thermal management unit, an electric drive and electronic control thermal management unit, an air conditioning thermal management unit, a thermal management mode selection unit and a unit capacity allocation unit, wherein the thermal management mode selection unit selects a thermal management mode according to the requirements of the battery thermal management unit, the electric drive and electronic control thermal management unit and the air conditioning thermal management unit, and the unit capacity allocation unit allocates output capacity to the first heat pump module and allocates output capacity to the second heat pump module according to the selected thermal management mode.

10. The thermal management system according to claim 2, characterized in that: The first coolant circuit and the second coolant circuit are connected in parallel with the whole vehicle coolant circuit of the electric truck through a valve device, wherein the valve device is a three-way valve, wherein the whole vehicle coolant circuit includes a battery pack coolant circuit and an electric drive and electronic control coolant circuit, wherein the first multi-way valve and the second multi-way valve are respectively connected to the battery pack coolant circuit and / or the electric drive and electronic control coolant circuit.

11. An electric truck, characterized in that: The electric truck has a thermal management system according to any one of claims 1 to 10.

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