Electric drive system, vehicle, control method, storage medium and computer program product

Abstract

The invention relates to an electric drive system, a vehicle, a control method, a storage medium and a computer program product. The electric drive system comprises a motor module, a first cooling passage, a pump body, a second cooling passage and a valve body. In the electric drive system, the valve body and the second cooling passage are arranged, so that the second cooling liquid can exchange heat with the motor module or bypass the motor module; by combining the control of the pump body on the first cooling passage, the first cooling liquid flows or stops flowing so as to carry out heat exchange on the motor module or stops heat exchange, so that different heat exchange modes of the electric drive system can be used independently or in a combined manner, and multiple cooling modes are achieved; by means of the technical scheme, the electric drive system can flexibly switch the heat exchange modes according to actual requirements so as to better meet the heat exchange requirements under different working conditions.

Description

Technical Field

[0001] The present application relates to the field of vehicle technology, and in particular to an electric drive system, a vehicle, a control method, a storage medium, and a computer program product. Background Art

[0002] With the rapid development of the new energy vehicle industry, the electric drive system, as a core component of electric vehicles, has become increasingly important. Its performance and reliability directly determine the vehicle's power, economy, and service life. To ensure efficient and stable operation under various operating conditions, precise temperature control of key components in the electric drive system is essential to prevent performance degradation or even damage due to overheating or overcooling.

[0003] Electric drive systems typically use water or air cooling to dissipate heat, exchanging heat between the coolant or air and the electric drive components. However, as the power density of electric drive systems continues to increase, their heat dissipation requirements are also changing dynamically. Especially under high-load conditions, a single cooling mode cannot meet the diverse heat dissipation needs of the system. Summary of the Invention

[0004] An embodiment of the present application provides an electric drive system that adopts multiple cooling modes and can be flexibly switched according to actual needs, so that the electric drive system can better adapt to the heat dissipation requirements under different working conditions.

[0005] In order to achieve the above objectives, according to a first aspect of the present application, an electric drive system is provided, comprising:

[0006] Motor module;

[0007] a first cooling passage, wherein a first coolant can flow through the first cooling passage and the first cooling passage is connected to the motor module for heat exchange;

[0008] a pump body, the pump body being connected to the first cooling passage and capable of controlling the flow of the first coolant in the first cooling passage and exchanging heat with the motor module;

[0009] a second cooling passage, wherein a second coolant can flow through the second cooling passage, the second cooling passage comprising a first branch and a second branch, the first branch being connected to the motor module for heat exchange, and the second branch being staggered from the motor module; and

[0010] A valve body is connected to the second cooling passage, and the valve body is capable of controlling the second coolant of the second cooling passage to flow through the first branch or the second branch.

[0011] Optionally, the motor module includes a first shell and a drive unit, a first cavity is provided in the first shell, the drive unit is provided in the first cavity, the second cooling passage and the first cooling passage are both installed in the first shell, and the second cooling passage and the first cooling passage are connected for heat exchange.

[0012] Optionally, the first branch of the second cooling passage and the first cooling passage are both connected to the first shell for heat exchange, and heat dissipation fins are further provided on the outer periphery of the first shell.

[0013] Optionally, the drive unit includes a rotor and a stator, and the first cooling passage is further connected to the rotor and / or the stator for heat exchange.

[0014] Optionally, the electric drive system also includes a transmission module, in which a first coolant can be stored. The motor module is driven and connected to the transmission module, and the motor module is connected to the transmission module through the first cooling passage. The first coolant in the transmission module can circulate between the transmission module and the motor module through the first cooling passage.

[0015] Optionally, the electric drive system further includes:

[0016] a first temperature sensor, the first temperature sensor being disposed in the second cooling passage and capable of acquiring the temperature of the second coolant in the second cooling passage; and / or

[0017] A second temperature sensor is provided in the motor module and is capable of acquiring the temperature of the motor module; and / or

[0018] The third temperature sensor is disposed in the transmission module and can obtain the temperature of the first coolant in the transmission module.

[0019] Optionally, the transmission module includes a second housing and a transmission unit, a second chamber is provided in the second housing, the second chamber can store a first coolant, the transmission unit is provided in the second chamber, the second housing is connected to the first housing, and the rotor is drive-connected to the transmission unit, and the transmission unit can be lubricated by the first coolant.

[0020] Optionally, the first cooling passage includes a liquid return passage and multiple liquid delivery passages, the multiple liquid delivery passages are all connected to the liquid outlet of the pump body, and the pump body can deliver the first coolant for heat exchange through the liquid delivery passages, one of the liquid delivery passages is provided through the transmission unit and the rotor, and another of the liquid delivery passages is provided between the stator and the first housing;

[0021] The liquid inlet of the pump body is connected to the second chamber, and the first chamber and the second chamber are connected through the liquid return passage. The first coolant in the first chamber can enter the second chamber through the liquid return passage.

[0022] Optionally, the electric drive system further includes a filter, and the liquid inlet of the pump body is connected to the second chamber through the filter.

[0023] Optionally, the first cooling passage further includes a main path, one end of which is capable of flowing into the second coolant, the other end of which is connected to the common end of the valve body, the first branch path is connected to the first connecting end of the valve body, and the second branch path is connected to the second connecting end of the valve body;

[0024] The valve body is capable of controlling one of the first branch and the second branch to be connected to the main circuit, so as to control the second coolant of the main circuit to flow through the first branch or the second branch.

[0025] Optionally, the electric drive system further includes a charging and distribution module, and the charging and distribution module is connected to the main circuit for heat exchange; and / or;

[0026] The electric drive system further includes an electric control module, which is connected to the main circuit for heat exchange.

[0027] According to a second aspect of the present application, a vehicle is provided, comprising the electric drive system of the first aspect.

[0028] Optionally, the second cooling passage is connected to the refrigeration system, and a second coolant of the refrigeration system can flow into the second cooling passage and flow back to the refrigeration system from the second cooling passage.

[0029] According to a second aspect of the present application, a control method is provided. The control method is applied to the electric drive system described in the first aspect or to the vehicle described in the first aspect, and the control method includes:

[0030] Obtaining the working status of the motor module;

[0031] The pump body and the valve body are controlled according to the working state of the motor module so that the first coolant of the first cooling path flows through or stops flowing through the motor module, and the second coolant of the second cooling path flows through the first branch or the second branch.

[0032] Optionally, controlling the pump body and the valve body according to the working state of the motor module to allow the first coolant in the first cooling passage to flow through or stop flowing through the motor module, and allowing the second coolant in the second cooling passage to flow through the first branch or the second branch includes:

[0033] When the motor module is in a non-operating state, controlling the pump body to stop the first coolant from flowing through the motor module through the first cooling passage, and controlling the valve body to allow the second coolant in the second cooling passage to flow through the second branch; and / or,

[0034] When the motor module is in a charging state, the pump body is controlled to allow the first coolant to flow through the motor module via the first cooling passage, and the valve body is controlled to allow the second coolant in the second cooling passage to flow through the first branch; and / or,

[0035] When the working state of the motor module is the waste heat recovery state, the pump body is controlled to make the first coolant flow through the motor module through the first cooling passage, and the valve body is controlled to make the second coolant in the second cooling passage flow through the first branch; and / or,

[0036] When the working state of the motor module is the driving state, the temperature of the second coolant, the temperature of the motor module and the temperature of the first coolant are obtained, and the pump body and the valve body are controlled according to the temperature of the second coolant, the temperature of the motor module and the temperature of the first coolant, so that the first coolant in the first cooling passage flows through or stops flowing through the motor module, and the second coolant in the second cooling passage flows through the first branch or the second branch.

[0037] Optionally, when the working state of the motor module is the charging state, after controlling the pump body to allow the first coolant to flow through the motor module through the first cooling passage, and controlling the valve body to allow the second coolant in the second cooling passage to flow through the first branch, the control method further includes:

[0038] After the motor module is in a charging state for a first preset time, obtaining the temperature of the motor module;

[0039] When the temperature of the motor module is lower than a first limit temperature, maintaining the charging power of the motor module unchanged;

[0040] When the temperature of the motor module is not less than a first limit temperature, the charging power of the motor module is reduced.

[0041] Optionally, when the working state of the motor module is a waste heat recovery state, after controlling the pump body to allow the first coolant to flow through the motor module via the first cooling passage, and controlling the valve body to allow the second coolant in the second cooling passage to flow through the first branch, the control method further includes:

[0042] After the motor module is in the waste heat recovery state for a second preset time, obtaining the temperature of the motor module and the temperature of the second coolant;

[0043] When the temperature of the motor module is lower than the first limit temperature or the temperature of the second coolant is lower than the fourth limit temperature, maintaining the heating current of the motor module unchanged;

[0044] When the temperature of the motor module is not less than a first limit temperature and the temperature of the second coolant is not less than a fourth limit temperature, the heating current of the motor module is reduced.

[0045] Optionally, when the operating state of the motor module is a driving state, obtaining the temperature of the second coolant, the temperature of the motor module, and the temperature of the first coolant, and controlling the pump body and the valve body according to the temperature of the second coolant, the temperature of the motor module, and the temperature of the first coolant, so that the first coolant in the first cooling passage flows through or stops flowing through the motor module, and the second coolant in the second cooling passage flows through the first branch or the second branch includes:

[0046] When the temperature of the second coolant is not less than a third limit temperature, controlling the pump body to allow the first coolant to flow through the motor module via the first cooling passage, and controlling the valve body to allow the second coolant in the second cooling passage to flow through the second branch;

[0047] When the temperature of the second coolant is lower than a third limit temperature and the temperature of the motor module is not lower than the second limit temperature, the pump body is controlled to allow the first coolant to flow through the motor module via the first cooling passage, and the valve body is controlled to allow the second coolant in the second cooling passage to flow through the first branch;

[0048] When the temperature of the second coolant is lower than the third limit temperature, the temperature of the motor module is lower than the second limit temperature, and the temperature of the first coolant is not lower than the fifth limit temperature and lower than the seventh limit temperature, the pump body is controlled to stop the first coolant from flowing through the motor module through the first cooling passage, and the valve body is controlled to allow the second coolant in the second cooling passage to flow through the first branch;

[0049] When the temperature of the second coolant is lower than the third limit temperature, the temperature of the motor module is lower than the second limit temperature, and the temperature of the first coolant is not lower than the seventh limit temperature, the pump body is controlled to allow the first coolant to flow through the motor module via the first cooling passage, and the valve body is controlled to allow the second coolant in the second cooling passage to flow through the first branch;

[0050] When the temperature of the second coolant is lower than the third limit temperature, the temperature of the motor module is lower than the second limit temperature, and the temperature of the first coolant is lower than the fifth limit temperature, the pump body is controlled to make the first coolant flow through the motor module through the first cooling passage, and the valve body is controlled to make the second coolant in the second cooling passage flow through the second branch.

[0051] Optionally, when the temperature of the second coolant is lower than a third limit temperature, the temperature of the motor module is lower than a second limit temperature, and the temperature of the first coolant is not lower than a fifth limit temperature and lower than a seventh limit temperature, after controlling the pump body to stop the first coolant from flowing through the motor module via the first cooling passage, and controlling the valve body to allow the second coolant in the second cooling passage to flow through the first branch, the control method further includes:

[0052] After the motor module is in the driving state for a third preset time, obtaining the temperature of the first coolant and the temperature of the motor module;

[0053] When the temperature of the first coolant is greater than the seventh limit temperature or the temperature of the motor module is greater than the second limit temperature, the pump body is controlled to make the first coolant flow through the motor module through the first cooling passage, and the valve body is controlled to make the second coolant in the second cooling passage flow through the first branch.

[0054] Optionally, when the temperature of the second coolant is lower than a third limit temperature, the temperature of the motor module is lower than a second limit temperature, and the temperature of the first coolant is lower than a fifth limit temperature, after controlling the pump body to allow the first coolant to flow through the motor module via the first cooling passage, and controlling the valve body to allow the second coolant in the second cooling passage to flow through the second branch, the control method further includes:

[0055] After the motor module is in the driving state for a fourth preset time, the temperature of the first coolant and the temperature of the motor module are obtained; when the temperature of the first coolant is greater than a sixth limit temperature or the temperature of the motor module is greater than a second limit temperature, the pump body is controlled to stop the first coolant from flowing through the first cooling passage, and the valve body is controlled to allow the second coolant in the second cooling passage to flow through the first branch.

[0056] Optionally, after the motor module is in the driving state for a fourth preset time, the temperature of the first coolant and the temperature of the motor module are obtained; when the temperature of the first coolant is greater than a sixth limit temperature or the temperature of the motor module is greater than a second limit temperature, the pump body is controlled to stop the first coolant from flowing through the first cooling passage, and the valve body is controlled to allow the second coolant in the second cooling passage to flow through the first branch, the control method further includes:

[0057] After waiting for a fifth preset time period, obtaining the temperature of the first coolant and the temperature of the motor module;

[0058] When the temperature of the first coolant is greater than the seventh limit temperature or the temperature of the motor module is greater than the second limit temperature, the pump body is controlled to make the first coolant flow through the motor module through the first cooling passage, and the valve body is controlled to make the second coolant in the second cooling passage flow through the first branch.

[0059] Optionally, when the operating state of the motor module is the driving state, the temperature of the second coolant, the temperature of the motor module, and the temperature of the first coolant are obtained, and the pump body and the valve body are controlled according to the temperature of the second coolant, the temperature of the motor module, and the temperature of the first coolant, so that the first coolant in the first cooling passage flows through or stops flowing through the motor module, and after the second coolant in the second cooling passage flows through the first branch or the second branch, the control method further includes:

[0060] After waiting for a sixth preset time period, obtaining the temperature of the motor module;

[0061] When the temperature of the motor module is lower than the first limit temperature, the driving power of the motor module is kept unchanged; when the temperature of the motor module is not lower than the first limit temperature, the driving power of the motor module is reduced.

[0062] According to a fourth aspect of the present application, a storage medium is provided, on which a computer program or instruction is stored. When the computer program or instruction is executed by a processor, the steps of the control method described in the third aspect are implemented.

[0063] According to a fifth aspect of the present application, a computer program product is provided, comprising a computer program or instructions, which implement the steps of the control method described in the third aspect when executed by a processor.

[0064] In the electric drive system of the embodiment of the present application, the valve body and the second cooling passage are arranged so that the second coolant can exchange heat with the motor module or bypass the motor module; combined with the control of the first cooling passage by the pump body, the first coolant flows or stops flowing to exchange heat with the motor module or stops exchanging heat, so that different heat exchange methods of the electric drive system can be used alone or in combination to have multiple cooling modes; through the above technical solution, the electric drive system can flexibly switch the heat exchange mode according to actual needs to better adapt to the heat exchange requirements under different working conditions.

[0065] Other features and advantages of the present application will be described in detail in the subsequent detailed description. BRIEF DESCRIPTION OF THE DRAWINGS

[0066] To more clearly illustrate the technical solutions in the embodiments of the present application, the following briefly introduces the drawings required for describing the embodiments. Obviously, the drawings described below are only some embodiments of the present application. Those skilled in the art can also derive other drawings based on these drawings without inventive effort.

[0067] In order to more completely understand the present application and its beneficial effects, the following description will be given in conjunction with the accompanying drawings, wherein the same drawing numbers represent the same parts in the following description.

[0068] Figure 1 is a schematic diagram of an electric drive system provided in an exemplary embodiment of the present disclosure.

[0069] Figure 2 yes Figure 1 The schematic diagram of the second cooling passage, valve body, first housing, charging and distribution module and electronic control module of the electric drive system is shown.

[0070] Figure 3 Schematic diagram of the structure of the motor module of the electric drive system provided in an exemplary embodiment of the present disclosure.

[0071] Figure 4 3 is a structural diagram of a first working state of an electric drive system provided in an exemplary embodiment of the present disclosure.

[0072] Figure 5 3 is a structural diagram of a second working state of the electric drive system provided in an exemplary embodiment of the present disclosure.

[0073] Figure 6 3 is a structural diagram of the third working state of the electric drive system provided in an exemplary embodiment of the present disclosure.

[0074] Figure 7 3 is a structural diagram of a fourth working state of the electric drive system provided in an exemplary embodiment of the present disclosure.

[0075] Figure 8 is a flowchart of a control method provided in an exemplary embodiment of the present disclosure.

[0076] Description of reference numerals:

[0077] 1. Motor module; 11. First housing; 111. First cavity; 112. Heat dissipation fins; 12. Rotor; 13. Stator;

[0078] 2. First cooling passage; 21. Liquid return passage; 22. Liquid supply passage;

[0079] 3. Pump body; 31. Liquid outlet; 32. Liquid inlet;

[0080] 4. Second cooling passage; 41. First branch; 42. Second branch; 43. Main passage;

[0081] 5. Valve body; 51. Common end; 52. First connection end; 53. Second connection end;

[0082] 6. Transmission module; 61. Second housing; 611. Second cavity; 62. Transmission unit;

[0083] 71. Filter;

[0084] 72. Charging and distribution module;

[0085] 73. Electronic control module.

[0086] 74. A first temperature sensor;

[0087] 75. Second temperature sensor;

[0088] 76. The third temperature sensor. DETAILED DESCRIPTION

[0089] The following will be combined with the drawings in the embodiments of the present application to clearly and completely describe the technical solutions in the embodiments of the present application. Obviously, the embodiments described are only part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative work are within the scope of protection of the present application.

[0090] In the first aspect of the present application, an electric drive system is provided. Figure 1-4It can be seen that the electric drive system includes a motor module 1, a first cooling passage 2, a pump body 3, a second cooling passage 4 and a valve body 5. The first cooling passage 2 can circulate the first coolant, and the first cooling passage 2 is connected to the motor module 1 for heat exchange; the pump body 3 is connected to the first cooling passage 2, and can control the flow of the first coolant in the first cooling passage 2 and exchange heat with the motor module 1; the second cooling passage 4 can circulate the second coolant, and the second cooling passage 4 includes a first branch 41 and a second branch 42. The first branch 41 is connected to the motor module 1 for heat exchange, and the second branch 42 is staggered with the motor module 1; the valve body 5 is connected to the second cooling passage 4, and the valve body 5 can control the second coolant in the second cooling passage 4 to flow through the first branch 41 or the second branch 42.

[0091] The arrangement of the valve body 5 and the second cooling passage 4 enables the second coolant to exchange heat with the motor module 1 or bypass the motor module 1; combined with the control of the first cooling passage 2 by the pump body 3, the first coolant flows or stops flowing to exchange heat with the motor module 1 or stops exchanging heat, so that different heat exchange methods of the electric drive system can be used alone or in combination to have multiple cooling modes; through the above technical solution, the electric drive system can flexibly switch the heat exchange mode according to actual needs to better adapt to the heat exchange requirements under different working conditions.

[0092] For example, the first coolant may be a lubricant such as gear oil or other heat exchange medium; the second coolant may be a refrigerant or water or other heat exchange medium of a vehicle's cooling system.

[0093] In some embodiments, the motor module 1 includes a first shell 11 and a drive unit, a first cavity 111 is provided in the first shell 11, the drive unit is provided in the first cavity 111, the second cooling passage 4 and the first cooling passage 2 are both installed in the first shell 11, and the second cooling passage 4 and the first cooling passage 2 are connected for heat exchange.

[0094] The first coolant in the first cooling passage 2 and the second coolant in the second cooling passage 4 can exchange heat. Through the cooperation of the first cooling passage 2 and the second cooling passage 4, the heat dissipation requirements under different working conditions can be better adapted.

[0095] Illustratively, the second cooling passage 4 may be connected to the first cooling passage 2 in a heat exchange manner via the first branch 41 and / or the second branch 42 .

[0096] In some embodiments, the first branch 41 of the second cooling passage 4 and the first cooling passage 2 are both connected to the first shell 11 for heat exchange, and heat dissipation fins 112 are further provided on the outer periphery of the first shell 11 .

[0097] The first shell 11 can exchange heat with the airflow flowing through the motor module through the heat dissipation fins, and can also exchange heat with the first coolant when the first coolant flows through the first shell 11 through the first cooling passage 2; and the first shell 11 exchanges heat with the second coolant when the second coolant in the second cooling passage 4 flows through its first branch 41; and the first coolant and the second coolant can also exchange heat with the first shell 11 at the same time. At this time, the first coolant and the second coolant also exchange heat with the first shell 11, so as to realize the heat exchange connection between the first branch 41 of the second cooling passage 4 and the first cooling passage 2.

[0098] For example, the first cooling passage 2 may be provided on the outer side of the first shell 11 away from the first cavity 111 , and may be attached to, fixed to, or embedded in the outer side of the first shell 11 ; and / or,

[0099] The first cooling passage 2 is provided in the wall of the first shell 11; and / or,

[0100] The first cooling passage 2 may be provided on the inner side of the first shell 11 facing the first cavity 111 , and may be attached to, fixed to, or embedded in the inner side of the first shell 11 .

[0101] The first branch 41 may be provided on the outside of the first housing 11 away from the first cavity 111 so as to be fitted, fixed or embedded on the outside of the first housing 11; and / or,

[0102] The first branch 41 is provided in the wall of the first housing 11; and / or,

[0103] The first branch 41 may be provided on the inner side of the first shell 11 facing the first cavity, so as to be fitted, fixed or embedded inside the first shell 11 .

[0104] The first branch 41 and the first cooling passage 2 may be arranged on the first shell 11 in a selected and combined manner as required.

[0105] The first shell 11 can exchange heat with the external airflow through the heat dissipation fins 112, so that the motor module 1 has the function of air cooling and heat dissipation; and the heat dissipation method of the heat dissipation fins 112 can also be coordinated with the first coolant and the second coolant, so that the electric drive system has more cooling modes to better adapt to the heat dissipation requirements under different working conditions.

[0106] In some embodiments, there are multiple heat dissipation fins 112 , and the multiple heat dissipation fins 112 are arranged on the outer periphery of the first housing 11 along the circumference of the first housing 11 .

[0107] In some embodiments, the drive unit includes a rotor 12 and a stator 13 , and the first cooling passage 2 is further connected to the rotor 12 and / or the stator 13 for heat exchange.

[0108] The first coolant can flow through the rotor 12 and / or the stator 13 through the first cooling channel to dissipate heat for the rotor 12 and / or the stator 13, which can more effectively dissipate heat for the motor module 1 to ensure that the motor operates in a good working condition and reduce failures caused by overheating.

[0109] In some embodiments, the electric drive system also includes a transmission module 6, which can store a first coolant. The motor module 1 is driven and connected to the transmission module 6, and the motor module 1 is connected to the transmission module 6 through a first cooling passage 2. The first coolant in the transmission module 6 can circulate between the transmission module 6 and the motor module 1 through the first cooling passage 2.

[0110] By storing the first coolant in the transmission module 6, the number of containers for storing the first coolant can be reduced, and the first coolant can also dissipate heat for the transmission module 6 to ensure the normal operation of the transmission module 6 and extend its service life.

[0111] In some embodiments, the electric drive system further comprises:

[0112] A first temperature sensor 74 is provided in the second cooling passage 4 and can obtain the temperature of the second coolant and can control whether to exchange heat with the motor module 1 through the second coolant according to the temperature of the second coolant; and / or

[0113] A second temperature sensor 75 is provided in the motor module 1 and can obtain the temperature of the motor module 1. The second temperature sensor 75 can flexibly switch the cooling mode according to the temperature of the motor module 1 to better adapt to the heat dissipation requirements of the motor module 1 at different temperatures; and / or

[0114] The third temperature sensor 76 is arranged in the transmission module 6, and can obtain the temperature of the first coolant in the transmission module 6. It can control whether heat is exchanged with the motor module 1 through the first coolant according to the temperature of the first coolant entering the first cooling passage 2, and control whether heat is exchanged between the first coolant and the second coolant.

[0115] In some embodiments, the transmission module 6 includes a second shell 61 and a transmission unit 62. A second cavity 611 is provided in the second shell 61, and the second cavity 611 can store the first coolant. The transmission unit 62 is provided in the second cavity 611. The second shell 61 is connected to the first shell 11, and the rotor 12 is drive-connected to the transmission unit 62. The transmission unit 62 can be lubricated by the first coolant.

[0116] The first coolant can be used for heat exchange with the motor module 1 and the transmission module 6 to ensure the normal operation of the motor module 1 and the transmission module 6 and extend their service life; it can also be used for lubrication of the transmission unit 62 in the second shell 61 of the transmission module 6 to ensure efficient, stable and long-term operation of the transmission unit 62.

[0117] In some embodiments, the first cooling passage 2 includes a liquid return passage 21 and multiple liquid delivery passages 22. The multiple liquid delivery passages 22 are all connected to the liquid outlet 31 of the pump body 3. The pump body 3 can deliver the first coolant for heat exchange through the liquid delivery passages 22. One liquid delivery passage 22 is provided between the transmission unit 62 and the rotor 12, and the other liquid delivery passage 22 is provided between the stator 13 and the first housing 11.

[0118] The liquid inlet 32 ​​of the pump body 3 is connected to the second chamber 611 . The first chamber 111 and the second chamber 611 are connected through the liquid return passage 21 . The first coolant in the first chamber 111 can enter the second chamber 611 through the liquid return passage 21 .

[0119] The pump body 3 extracts the first coolant from the bottom of the second chamber 611 through the liquid inlet 32, and transports the first coolant through the transmission unit 62 and the rotor 12 through its liquid outlet 31 through a liquid delivery passage 22 to dissipate heat for the transmission unit 62 and the rotor 12. Finally, the first coolant that has passed through the rotor 12 can flow out of the rotor 12 and fall to the bottom of the second chamber 611 under the action of gravity; the pump body 3 also inputs the first coolant through its liquid outlet 31 through another liquid delivery passage 22 to between the stator 13 and the first shell 11 to dissipate heat for the stator 13 and the first shell 11, and after flowing through the stator 13 and the first shell 11, it falls to the bottom of the second chamber 611 under the action of gravity; and the first coolant at the bottom of the first shell 11 can enter the bottom of the second chamber 611 through the liquid return passage 21, completing the circulation of the first coolant.

[0120] Exemplarily, the rotor 12 may have an opening away from the transmission module 6 for allowing the first coolant to flow out, or there may be multiple openings around the rotor 12 for allowing the first coolant to flow out; there may be an opening between the stator 13 and the first housing 11 for allowing the first coolant to flow out, or there may be an opening on the stator 13 for allowing the first coolant to flow out.

[0121] In some embodiments, there is space in the wall of the first shell 11 for the first branch 41 to pass through, thereby heat-exchange connected with the first branch 41; or, the first branch 41 is attached to the outer periphery of the first shell 11 to heat-exchange connected with the first shell 11.

[0122] In some embodiments, a slot is provided on the inner side of the first cavity 111 of the first shell 11, and a liquid supply passage 22 is provided between the stator 13 and the first shell 11 through the slot; or, a slot is provided on the side of the rotor 12 close to the first shell 11, and a liquid supply passage 22 is provided between the stator 13 and the first shell 11 through the slot; or, a slot is provided on both the inner side of the first cavity 111 of the first shell 11 and the side of the rotor 12 close to the first shell 11, and the slots of the two are opposite to each other, and a liquid supply passage 22 is provided between the stator 13 and the first shell 11 through the opposite slots.

[0123] In some embodiments, the electric drive system further includes a filter 71 , and the liquid inlet 32 ​​of the pump body 3 is connected to the second chamber 611 through the filter 71 , so as to filter the first coolant in the second chamber 611 through the filter 71 .

[0124] In some embodiments, the first cooling passage 2 further includes a main passage 43, one end of which is capable of flowing into the second coolant, the other end of which is connected to the common end 51 of the valve body 5, the first branch passage 41 is connected to the first connection end 52 of the valve body 5, and the second branch passage 42 is connected to the second connection end 53 of the valve body 5;

[0125] The valve body 5 can control one of the first branch 41 and the second branch 42 to be connected to the main path 43 , so as to control the second coolant in the main path 43 to flow through the first branch 41 or the second branch 42 .

[0126] After the second coolant flows into the main path 43, the valve body 5 can rotate one of the first connection end 52 and the second connection end 53 to connect with the common end 51, control one of the first branch 41 and the second branch 42 to connect with the main path 43, and then control the second coolant of the main path 43 to flow through the first branch 41 or the second branch 42.

[0127] Exemplarily, the valve body 5 is any one of three-way valve types such as a bypass valve, a solenoid valve, and a temperature control valve.

[0128] In some embodiments, the electric drive system further includes a charging and distribution module 72 , which is connected to the main road 43 for heat exchange. Specifically, the main road 43 may pass through and / or be attached to the charging and distribution module 72 ; and / or;

[0129] The electric drive system further includes an electric control module 73 , which is connected to the main road 43 for heat exchange. Specifically, the main road 43 may pass through and / or adhere to the electric control module 73 .

[0130] After the second coolant flows into the main path 43 , the second coolant can dissipate heat from the charging and distribution module 72 and the electronic control module 73 to ensure normal operation of the charging and distribution module 72 and the electronic control module 73 .

[0131] The following describes several working states of the electric drive system: Figure 4 It can be seen that this is the working state where both the first coolant and the second coolant exchange heat with the motor module; Figure 5 It can be seen that this is the working state in which neither the first coolant nor the second coolant exchanges heat with the motor module; Figure 6 It can be seen that this is the working state in which the first coolant exchanges heat with the motor module and the second coolant does not exchange heat with the motor module; Figure 7 It can be seen that this is the working state in which the second coolant exchanges heat with the motor module, and the first coolant does not exchange heat with the motor module; it is worth noting that Figure 4-7 In the figure, the dotted line indicates the state where the first coolant does not flow in the first cooling passage and the second coolant does not flow in the second cooling passage, and the solid line indicates the state where the first coolant does not flow in the first cooling passage and the second coolant flows in the second cooling passage.

[0132] According to a second aspect of the present application, a vehicle is provided, comprising the electric drive system of the first aspect.

[0133] The vehicle of the second aspect has all the beneficial effects of the electric drive system of the first aspect described above, which will not be described in detail in this disclosure.

[0134] The vehicle may be a fuel vehicle, a plug-in hybrid vehicle, a new energy vehicle, etc., and this disclosure does not make any specific limitations on this.

[0135] In some embodiments, the vehicle further includes a refrigeration system, the second cooling passage 4 is connected to the refrigeration system, and the second coolant of the refrigeration system can flow into the second cooling passage 4 and flow back to the refrigeration system from the second cooling passage 4 .

[0136] The second cooling pipeline uses the refrigerant of the refrigeration system as the second coolant, which can effectively reduce costs. In addition, in a low-temperature environment, the first coolant and the second coolant exchange heat in the first shell 11, and the waste heat recovery efficiency is high.

[0137] According to the third aspect of the present application, a control method is provided, combining Figure 8 It can be seen that the control method is applied to the electric drive system of the first aspect or to the vehicle of the second aspect, and the control method includes:

[0138] S101, obtaining the working status of the motor module 1;

[0139] The operating status of a vehicle's motor module 1 can be determined in a variety of ways. For example, automotive motors are typically equipped with multiple sensors that monitor the motor's operating status in real time. The vehicle's onboard computer (e.g., the Vehicle Control Unit (VCU)) receives and processes the sensor data to determine the operating status of the motor module 1. The operating status of the motor module 1 includes, but is not limited to, non-operating, charging, waste heat recovery, and driving status.

[0140] S201, control the pump body 3 and the valve body 5 according to the working state of the motor module 1, so that the first coolant of the first cooling passage 2 flows through or stops flowing through the motor module 1, and the second coolant of the second cooling passage 4 flows through the first branch 41 or the second branch 42.

[0141] By controlling the pump body 3 and the valve body 5, the first coolant and / or the second coolant can dissipate heat for the motor module 1. During this process, the pump body 3 and the valve body 5 can be flexibly controlled according to the working state of the motor module 1 to better adapt to the heat dissipation requirements under different working conditions.

[0142] In some embodiments, controlling the pump body 3 and the valve body 5 according to the working state of the motor module 1 so that the first coolant of the first cooling passage 2 flows through or stops flowing through the motor module 1, and the second coolant of the second cooling passage 4 flows through the first branch 41 or the second branch 42 includes:

[0143] When the motor module 1 is in a non-working state, the pump body 3 is controlled to stop the first coolant from flowing through the motor module 1 through the first cooling passage 2, and the valve body 5 is controlled to allow the second coolant of the second cooling passage 4 to flow through the second branch 42 to bypass the motor module 1; when the motor module 1 is in a non-working state, the motor module 1 is not working and there is no need to dissipate heat through the first coolant and the second coolant.

[0144] When the working state of the motor module 1 is the charging state, the pump body 3 is controlled to make the first coolant flow through the motor module 1 through the first cooling passage 2, and the valve body 5 is controlled to make the second coolant of the second cooling passage 4 flow through the first branch 41; when the working state of the motor module 1 is the charging state, the windings, IGBTs and other components of the motor module 1 are used as components in the current boost / voltage boost circuit to increase the charging voltage or charging current. At this time, the motor module 1 generates more heat, and the first coolant and the second coolant are used to dissipate heat from the motor module 1 through cooperation.

[0145] When the working state of the motor module 1 is the waste heat recovery state, the pump body 3 is controlled to make the first coolant flow through the motor module 1 through the first cooling passage 2, and the valve body 5 is controlled to make the second coolant of the second cooling passage 4 flow through the first branch 41; when the working state of the motor module 1 is the waste heat recovery state, the motor module 1 generates heat, and while the second coolant exchanges heat with the motor module 1 on the outside of the motor module 1, the first coolant exchanges heat with the motor module 1 inside the motor module 1, and finally transfers the heat energy to the second coolant to complete the heat recovery of the motor module 1 as much as possible.

[0146] When the working state of the motor module 1 is the driving state, the temperature of the second coolant, the temperature of the motor module 1 and the temperature of the first coolant are obtained, and the pump body 3 and the valve body 5 are controlled according to the temperature of the second coolant, the temperature of the motor module 1 and the temperature of the first coolant, so that the first coolant of the first cooling passage 2 flows through or stops flowing through the motor module 1, and the second coolant of the second cooling passage 4 flows through the first branch 41 or the second branch 42; the working conditions of the motor module 1 in the driving state are more complex and changeable. The cooling mode of the motor module 1 is controlled according to the temperature of the second coolant, the temperature of the motor module 1 and the temperature of the first coolant to better adapt to the heat dissipation requirements under different working conditions.

[0147] The control modes under the above-mentioned working states can all be integrated and set, or one or more of them can be selected and set according to needs.

[0148] In some embodiments, when the working state of the motor module 1 is the charging state, after controlling the pump body 3 to allow the first coolant to flow through the motor module 1 through the first cooling passage 2, and controlling the valve body 5 to allow the second coolant in the second cooling passage 4 to flow through the first branch 41, the control method further includes:

[0149] After the motor module 1 is in the charging state for a first preset time, the temperature of the motor module is obtained.

[0150] When the temperature of the motor module 1 is lower than the first limit temperature, the charging power of the motor module 1 is kept unchanged. By keeping the charging power of the motor module 1 below the first limit temperature, the charging speed of the motor module 1 is ensured to be more stable.

[0151] When the temperature of the motor module 1 is not less than the first limit temperature, the charging power of the motor module 1 is reduced to prevent the temperature of the motor module 1 from being too high, thereby affecting the normal operation and service life of the motor module 1 .

[0152] For example, when the motor module 1 is in a charging state, it can be determined once every first preset time. When the temperature of the motor module 1 is lower than the first limit temperature, the charging power of the motor module 1 is kept unchanged. By allowing the motor module 1 to maintain its charging power below the first limit temperature, the charging speed of the motor module 1 is ensured to be more stable.

[0153] In some embodiments, when the motor module 1 is in the waste heat recovery state, after controlling the pump body 3 to allow the first coolant to flow through the motor module 1 through the first cooling passage 2, and controlling the valve body 5 to allow the second coolant in the second cooling passage 4 to flow through the first branch 41, the control method further includes:

[0154] After the motor module 1 is in the waste heat recovery state for a second preset time, the temperature of the motor module and the temperature of the second coolant are obtained.

[0155] When the temperature of the motor module 1 is lower than the first limit temperature or the temperature of the second coolant is lower than the fourth limit temperature (when the temperature of the second coolant is lower than the fourth limit temperature, the external ambient temperature is lower), the heating current of the motor module 1 is kept unchanged to ensure the waste heat recovery effect of the motor module 1.

[0156] When the temperature of the motor module 1 is not less than the first limit temperature and the temperature of the second coolant is not less than the fourth limit temperature, the heating current of the motor module 1 is reduced. At this time, the temperature of the motor module 1 is too high and the external ambient temperature is not too low. The heating current of the motor module 1 is reduced to avoid affecting the normal operation and service life of the motor module 1.

[0157] For example, when the motor module 1 is in the waste heat recovery state, it can be determined once every second preset time. When the temperature of the motor module 1 is lower than the first limit temperature or the temperature of the second coolant is lower than the fourth limit temperature, the heating current of the motor module 1 is kept unchanged to ensure the waste heat recovery effect of the motor module 1.

[0158] In some embodiments, when the working state of the motor module 1 is the driving state, obtaining the temperature of the second coolant, the temperature of the motor module 1, and the temperature of the first coolant, and controlling the pump body 3 and the valve body 5 according to the temperature of the second coolant, the temperature of the motor module 1, and the temperature of the first coolant, so that the first coolant of the first cooling passage 2 flows through or stops flowing through the motor module 1, and the second coolant of the second cooling passage 4 flows through the first branch 41 or the second branch 42 includes:

[0159] When the temperature of the second coolant is not less than the third limit temperature, the pump body 3 is controlled to allow the first coolant to flow through the motor module 1 through the first cooling passage 2, and the valve body 5 is controlled to allow the second coolant in the second cooling passage 4 to flow through the second branch 42 to bypass the motor module 1.

[0160] At this time, the air-conditioning compressor of the vehicle's refrigeration system is overloaded. In order to prioritize the cooling of the passenger compartment, it is necessary to control the valve body 5 to allow the second coolant of the second cooling passage 4 to flow through the second branch 42 to bypass the motor module 1. The motor module 1 dissipates heat through the first coolant.

[0161] When the temperature of the second coolant is lower than the third limit temperature and the temperature of the motor module 1 is not lower than the second limit temperature, the pump body 3 is controlled to allow the first coolant to flow through the motor module 1 through the first cooling passage 2, and the valve body 5 is controlled to allow the second coolant in the second cooling passage 4 to flow through the first branch 41.

[0162] At this time, the temperature of the motor module 1 is too high, and the second coolant can participate in the heat exchange of the motor module 1 . Therefore, the first coolant and the second coolant cooperate to dissipate heat from the motor module 1 .

[0163] When the temperature of the second coolant is lower than the third limit temperature, the temperature of the motor module 1 is lower than the second limit temperature, and the temperature of the first coolant is not lower than the fifth limit temperature and lower than the seventh limit temperature, the pump body 3 is controlled to stop the first coolant from flowing through the first cooling passage 2 through the motor module 1, and the valve body 5 is controlled to allow the second coolant in the second cooling passage 4 to flow through the first branch 41.

[0164] At this time, the first coolant is in the efficient operating temperature range and can exchange heat with the motor module 1 through the second coolant to reduce the temperature of the motor module 1, and the first coolant can maintain its temperature.

[0165] When the temperature of the second coolant is lower than the third limit temperature, the temperature of the motor module 1 is lower than the second limit temperature, and the temperature of the first coolant is not lower than the seventh limit temperature, the pump body 3 is controlled to allow the first coolant to flow through the motor module 1 through the first cooling passage 2, and the valve body 5 is controlled to allow the second coolant in the second cooling passage 4 to flow through the first branch 41;

[0166] At this time, the temperature of the motor module 1 is not too high, and the second coolant can participate in the heat exchange of the motor module 1. The first coolant temperature is too high and is prone to high-temperature failure. The second coolant can exchange heat with the motor module 1 and the first coolant to reduce the temperature of the motor module 1 and the first coolant.

[0167] When the temperature of the second coolant is lower than the third limit temperature, the temperature of the motor module 1 is lower than the second limit temperature, and the temperature of the first coolant is lower than the fifth limit temperature, the pump body 3 is controlled to allow the first coolant to flow through the motor module 1 through the first cooling passage 2, and the valve body 5 is controlled to allow the second coolant in the second cooling passage 4 to flow through the second branch 42 to bypass the motor module 1.

[0168] At this time, the temperature of the motor module 1 is not too high, and the second coolant can participate in the heat exchange of the motor module 1. The first coolant has a low temperature, high viscosity, and low transmission efficiency. Heat exchange is only performed between the first coolant and the motor module to increase the temperature of the first coolant.

[0169] In some embodiments, when the temperature of the second coolant is lower than the third limit temperature, the temperature of the motor module 1 is lower than the second limit temperature, and the temperature of the first coolant is not lower than the fifth limit temperature and lower than the seventh limit temperature, after controlling the pump body 3 to stop the first coolant from flowing through the motor module 1 through the first cooling passage 2, and controlling the valve body 5 to allow the second coolant in the second cooling passage 4 to flow through the first branch 41, the control method further includes:

[0170] After the motor module 1 is in the driving state for a third preset time, the temperature of the first coolant is obtained.

[0171] When the temperature of the first coolant is greater than the seventh limit temperature or the temperature of the motor module 1 is greater than the second limit temperature, the pump body 3 is controlled to allow the first coolant to flow through the motor module 1 through the first cooling passage 2, and the valve body 5 is controlled to allow the second coolant in the second cooling passage 4 to flow through the first branch 41.

[0172] Alternatively, after the motor module 1 is in the driving state for a third preset time, the temperature of the motor module 1 is obtained.

[0173] When the temperature of the motor module 1 is greater than the second limit temperature, the pump body 3 is controlled to allow the first coolant to flow through the motor module 1 through the first cooling passage 2 , and the valve body 5 is controlled to allow the second coolant in the second cooling passage 4 to flow through the first branch 41 .

[0174] At this time, the first coolant is prone to failure due to high temperature, and the second coolant can be used to exchange heat with the motor module 1 and the first coolant to reduce the temperature of the motor module 1 and the first coolant.

[0175] For example, when the motor module 1 is in the driving state, it can be determined once every third preset time that when the temperature of the first coolant is greater than the seventh limit temperature or the temperature of the motor module 1 is greater than the second limit temperature, the pump body 3 is controlled to make the first coolant flow through the motor module 1 through the first cooling passage 2, and the valve body 5 is controlled to make the second coolant in the second cooling passage 4 flow through the first branch 41.

[0176] In some embodiments, when the temperature of the second coolant is lower than the third limit temperature, the temperature of the motor module 1 is lower than the second limit temperature, and the temperature of the first coolant is lower than the fifth limit temperature, after controlling the pump body 3 to allow the first coolant to flow through the motor module 1 through the first cooling passage 2, and controlling the valve body 5 to allow the second coolant in the second cooling passage 4 to flow through the second branch 42 to bypass the motor module 1, the control method further includes:

[0177] After the motor module 1 is in the driving state for a fourth preset time, the temperature of the first coolant is obtained.

[0178] When the temperature of the first coolant is greater than the sixth limit temperature, the pump body 3 is controlled to stop the first coolant from flowing through the first cooling passage 2 through the motor module 1 , and the valve body 5 is controlled to allow the second coolant in the second cooling passage 4 to flow through the first branch 41 .

[0179] Alternatively, after the motor module 1 is in the driving state for a fourth preset time, the temperature of the motor module is obtained.

[0180] When the temperature of the motor module 1 is greater than the second limit temperature, the pump body 3 is controlled to stop the first coolant from flowing through the motor module 1 through the first cooling passage 2 , and the valve body 5 is controlled to allow the second coolant in the second cooling passage 4 to flow through the first branch 41 .

[0181] At this time, the gear oil is in the efficient operating temperature range and can exchange heat with the motor module 1 through the second coolant to reduce the temperature of the motor module 1, and the first coolant can maintain its temperature.

[0182] For example, when the motor module 1 is in the driving state, it can be determined once every fourth preset time that when the temperature of the first coolant is greater than the sixth limit temperature or the temperature of the motor module 1 is greater than the second limit temperature, the pump body 3 is controlled to stop the first coolant from flowing through the first cooling passage 2 through the motor module 1, and the valve body 5 is controlled to allow the second coolant in the second cooling passage 4 to flow through the first branch 41.

[0183] In some embodiments, after the motor module 1 is in the driving state for a fourth preset time, when the temperature of the first coolant is greater than the sixth limit temperature or the temperature of the motor module 1 is greater than the second limit temperature, the pump body 3 is controlled to stop the first coolant from flowing through the motor module 1 through the first cooling passage 2, and the valve body 5 is controlled to stop the second coolant in the second cooling passage 4 from flowing through the first branch 41. The control method further includes:

[0184] After waiting for a fifth preset time period, obtaining the temperature of the first coolant;

[0185] When the temperature of the first coolant is greater than the seventh limit temperature, the pump body 3 is controlled to allow the first coolant to flow through the motor module 1 through the first cooling passage 2, and the valve body 5 is controlled to allow the second coolant in the second cooling passage 4 to flow through the first branch 41;

[0186] Alternatively, after waiting for a fifth preset time period, the temperature of the motor module 1 is obtained;

[0187] When the temperature of the motor module 1 is greater than the second limit temperature, the pump body 3 is controlled to allow the first coolant to flow through the motor module 1 through the first cooling passage 2 , and the valve body 5 is controlled to allow the second coolant in the second cooling passage 4 to flow through the first branch 41 .

[0188] At this time, the first coolant is prone to failure due to high temperature, and the second coolant can be used to exchange heat with the motor module 1 and the first coolant to reduce the temperature of the motor module 1 and the first coolant.

[0189] Exemplarily, the temperature of the first coolant and the temperature of the motor module 1 are obtained once every fifth preset time period; when the temperature of the first coolant is greater than the seventh limit temperature or the temperature of the motor module 1 is greater than the second limit temperature, the pump body 3 is controlled to make the first coolant flow through the motor module 1 through the first cooling passage 2, and the valve body 5 is controlled to make the second coolant in the second cooling passage 4 flow through the first branch 41.

[0190] In some embodiments, after obtaining the temperature of the second coolant, the temperature of the motor module 1, and the temperature of the first coolant, and controlling the pump body 3 and the valve body 5 according to the temperature of the second coolant, the temperature of the motor module 1, and the temperature of the first coolant, so as to allow the first coolant of the first cooling passage 2 to flow through or stop flowing through the motor module 1, and the second coolant of the second cooling passage 4 to flow through the first branch or the second branch, the control method further includes:

[0191] After waiting for a sixth preset time period, obtaining the temperature of the motor module 1;

[0192] When the sixth preset time is reached and the temperature of the motor module 1 is lower than the first limit temperature, the driving power of the motor module 1 is kept unchanged to ensure stable driving of the motor module 1;

[0193] When the temperature of the motor module 1 is not less than the first limit temperature, the driving power of the motor module 1 is reduced to ensure safety.

[0194] Exemplarily, the temperature of the motor module 1 is obtained every sixth preset time;

[0195] When the sixth preset time is reached and the temperature of the motor module 1 is lower than the first limit temperature, the driving power of the motor module 1 is kept unchanged to ensure stable driving of the motor module 1;

[0196] When the temperature of the motor module 1 is not less than the first limit temperature, the driving power of the motor module 1 is reduced to ensure safety.

[0197] Specifically, the first preset time, the second preset time, the third preset time, the fourth preset time, the fifth preset time and the sixth preset time can all be set as needed; for example, the first preset time, the second preset time, the third preset time, the fourth preset time, the fifth preset time and the sixth preset time can take values ​​in the range of 30s-60s.

[0198] The first limiting temperature is between 130°C and 140°C; the second limiting temperature is between 80°C and 90°C.

[0199] The third limit temperature is between 50°C and 60°C; the fourth limit temperature is between 0°C and 10°C.

[0200] The fifth limit temperature is between 60°C and 70°C; the sixth limit temperature is between 80°C and 90°C; and the seventh limit temperature is between 110°C and 120°C.

[0201] According to a fourth aspect of the present application, a storage medium is provided, on which a computer program or instruction is stored, and when the computer program or instruction is executed by a processor, the steps of the control method of the third aspect are implemented.

[0202] According to a fifth aspect of the present application, a computer program product is provided, comprising a computer program or instructions, which implement the steps of the control method of the third aspect when the computer program or instructions are executed by a processor.

[0203] According to a sixth aspect of the present application, a controller is provided, on which a computer program or instruction is stored, and when the computer program or instruction is executed by a processor, the steps of the control method of the third aspect are implemented.

[0204] In the description of this application, the terms "first" and "second" are used for descriptive purposes only and should not be understood to indicate or imply relative importance or implicitly specify the number of technical features indicated. Therefore, a feature defined as "first" or "second" may explicitly or implicitly include one or more features. In the description of this application, "plurality" means two or more, unless otherwise specifically defined.

[0205] It should be noted that, in this application, "and / or" describes the relationship between associated objects, indicating that three possible relationships exist. For example, "A and / or B" can represent three situations: A exists alone, A and B exist simultaneously, and B exists alone. In addition, the character " / ", unless otherwise specified, generally indicates that the associated objects are in an "or" relationship.

[0206] In the above embodiments, the description of each embodiment has its own focus. For parts that are not described in detail in a certain embodiment, reference can be made to the relevant descriptions of other embodiments.

[0207] The embodiments, implementation methods and related technical features of the present application can be combined and replaced with each other without conflict.

[0208] The above are merely preferred embodiments of the present application and do not constitute any form of limitation to the present application. However, any simple modifications, equivalent changes, and modifications made to the above embodiments based on the technical essence of the present application without departing from the content of the technical solution of the present application are still within the scope of the technical solution of the present application.

Claims

1. An electric drive system, characterized in that: include: Motor module; a first cooling passage, wherein a first coolant can flow through the first cooling passage and the first cooling passage is connected to the motor module for heat exchange; a pump body, the pump body being connected to the first cooling passage and capable of controlling the flow of the first coolant in the first cooling passage and exchanging heat with the motor module; a second cooling passage, wherein a second coolant can flow through the second cooling passage, the second cooling passage comprising a first branch and a second branch, the first branch being connected to the motor module for heat exchange, and the second branch being staggered from the motor module; and A valve body is connected to the second cooling passage, and the valve body is capable of controlling the second coolant of the second cooling passage to flow through the first branch or the second branch.

2. The electric drive system according to claim 1, characterized in that: The motor module includes a first shell and a drive unit. A first cavity is provided in the first shell. The drive unit is provided in the first cavity. The second cooling passage and the first cooling passage are both installed in the first shell, and the second cooling passage and the first cooling passage are connected for heat exchange.

3. The electric drive system according to claim 2, characterized in that: The first branch of the second cooling passage and the first cooling passage are both connected to the first shell in heat exchange, and heat dissipation fins are further provided on the outer periphery of the first shell.

4. The electric drive system according to claim 2, characterized in that: The drive unit includes a rotor and a stator, and the first cooling passage is further connected to the rotor and / or the stator for heat exchange.

5. The electric drive system according to claim 4, characterized in that: The electric drive system also includes a transmission module, in which a first coolant can be stored. The motor module is driven and connected to the transmission module, and the motor module is connected to the transmission module through the first cooling passage. The first coolant in the transmission module can circulate between the transmission module and the motor module through the first cooling passage.

6. The electric drive system according to claim 5, characterized in that: The electric drive system further includes: a first temperature sensor, the first temperature sensor being disposed in the second cooling passage and capable of acquiring the temperature of the second coolant in the second cooling passage; and / or A second temperature sensor is provided in the motor module and is capable of acquiring the temperature of the motor module; and / or The third temperature sensor is disposed in the transmission module and can obtain the temperature of the first coolant in the transmission module.

7. The electric drive system according to claim 5, characterized in that: The transmission module includes a second housing and a transmission unit. The second housing is provided with a second cavity, which can store a first coolant. The transmission unit is provided in the second cavity. The second housing is connected to the first housing, and the rotor is drivingly connected to the transmission unit. The transmission unit can be lubricated by the first coolant.

8. The electric drive system according to claim 7, characterized in that: The first cooling passage includes a liquid return passage and multiple liquid supply passages, each of which is connected to the liquid outlet of the pump body. The pump body can transport the first coolant for heat exchange through the liquid supply passages. One of the liquid supply passages is provided between the transmission unit and the rotor, and another of the liquid supply passages is provided between the stator and the first housing. The liquid inlet of the pump body is connected to the second chamber, and the first chamber and the second chamber are connected through the liquid return passage. The first coolant in the first chamber can enter the second chamber through the liquid return passage.

9. The electric drive system according to claim 8, characterized in that: The electric drive system further includes a filter, and the liquid inlet of the pump body is connected to the second chamber through the filter.

10. The electric drive system according to any one of claims 1 to 9, characterized in that: The first cooling passage further includes a main path, one end of which is capable of flowing into the second coolant, the other end of which is connected to the common end of the valve body, the first branch path is connected to the first connecting end of the valve body, and the second branch path is connected to the second connecting end of the valve body; The valve body is capable of controlling one of the first branch and the second branch to be connected to the main circuit, so as to control the second coolant of the main circuit to flow through the first branch or the second branch.

11. The electric drive system according to claim 10, characterized in that: The electric drive system further includes a charging and distribution module, which is connected to the main circuit for heat exchange; and / or; The electric drive system further includes an electric control module, which is connected to the main circuit for heat exchange.

12. A vehicle, characterized in that: The electric drive system comprises the electric drive system according to any one of claims 1 to 11.

13. The vehicle according to claim 12, characterized in that The vehicle further includes a refrigeration system, the second cooling passage is connected to the refrigeration system, and a second coolant of the refrigeration system can flow into the second cooling passage and flow back to the refrigeration system from the second cooling passage.

14. A control method, characterized in that: The control method is applied to the electric drive system according to any one of claims 1 to 11 or to the vehicle according to claim 12 or 13, and the control method includes: Obtaining the working status of the motor module; The pump body and the valve body are controlled according to the working state of the motor module so that the first coolant of the first cooling path flows through or stops flowing through the motor module, and the second coolant of the second cooling path flows through the first branch or the second branch.

15. The control method according to claim 14, characterized in that: The controlling of the pump body and the valve body according to the working state of the motor module comprises: When the motor module is in a non-operating state, controlling the pump body to stop the first coolant from flowing through the motor module through the first cooling passage, and controlling the valve body to allow the second coolant in the second cooling passage to flow through the second branch; and / or, When the motor module is in a charging state, the pump body is controlled to allow the first coolant to flow through the motor module via the first cooling passage, and the valve body is controlled to allow the second coolant in the second cooling passage to flow through the first branch; and / or, When the working state of the motor module is the waste heat recovery state, the pump body is controlled to make the first coolant flow through the motor module through the first cooling passage, and the valve body is controlled to make the second coolant in the second cooling passage flow through the first branch; and / or, When the working state of the motor module is the driving state, the temperature of the second coolant, the temperature of the motor module and the temperature of the first coolant are obtained, and the pump body and the valve body are controlled according to the temperature of the second coolant, the temperature of the motor module and the temperature of the first coolant, so that the first coolant in the first cooling passage flows through or stops flowing through the motor module, and the second coolant in the second cooling passage flows through the first branch or the second branch.

16. The control method according to claim 15, characterized in that: When the working state of the motor module is the charging state, after controlling the pump body to allow the first coolant to flow through the motor module through the first cooling passage, and controlling the valve body to allow the second coolant in the second cooling passage to flow through the first branch, the control method further includes: After the motor module is in a charging state for a first preset time, obtaining the temperature of the motor module; When the temperature of the motor module is lower than a first limit temperature, maintaining the charging power of the motor module unchanged; When the temperature of the motor module is not less than a first limit temperature, the charging power of the motor module is reduced.

17. The control method according to claim 15, characterized in that: When the working state of the motor module is the waste heat recovery state, after controlling the pump body to allow the first coolant to flow through the motor module through the first cooling passage, and controlling the valve body to allow the second coolant in the second cooling passage to flow through the first branch, the control method further includes: After the motor module is in the waste heat recovery state for a second preset time, obtaining the temperature of the motor module and the temperature of the second coolant; When the temperature of the motor module is lower than the first limit temperature or the temperature of the second coolant is lower than the fourth limit temperature, maintaining the heating current of the motor module unchanged; When the temperature of the motor module is not less than a first limit temperature and the temperature of the second coolant is not less than a fourth limit temperature, the heating current of the motor module is reduced.

18. The control method according to claim 15, characterized in that: The controlling the pump body and the valve body according to the temperature of the second coolant, the temperature of the motor module and the temperature of the first coolant comprises: When the temperature of the second coolant is not less than a third limit temperature, controlling the pump body to allow the first coolant to flow through the motor module via the first cooling passage, and controlling the valve body to allow the second coolant in the second cooling passage to flow through the second branch; When the temperature of the second coolant is lower than a third limit temperature and the temperature of the motor module is not lower than the second limit temperature, the pump body is controlled to allow the first coolant to flow through the motor module via the first cooling passage, and the valve body is controlled to allow the second coolant in the second cooling passage to flow through the first branch; When the temperature of the second coolant is lower than the third limit temperature, the temperature of the motor module is lower than the second limit temperature, and the temperature of the first coolant is not lower than the fifth limit temperature and lower than the seventh limit temperature, the pump body is controlled to stop the first coolant from flowing through the motor module through the first cooling passage, and the valve body is controlled to allow the second coolant in the second cooling passage to flow through the first branch; When the temperature of the second coolant is lower than the third limit temperature, the temperature of the motor module is lower than the second limit temperature, and the temperature of the first coolant is not lower than the seventh limit temperature, the pump body is controlled to allow the first coolant to flow through the motor module via the first cooling passage, and the valve body is controlled to allow the second coolant in the second cooling passage to flow through the first branch; When the temperature of the second coolant is lower than the third limit temperature, the temperature of the motor module is lower than the second limit temperature, and the temperature of the first coolant is lower than the fifth limit temperature, the pump body is controlled to make the first coolant flow through the motor module through the first cooling passage, and the valve body is controlled to make the second coolant in the second cooling passage flow through the second branch.

19. The control method according to claim 18, characterized in that: After controlling the pump body to stop the first coolant from flowing through the motor module via the first cooling passage, and controlling the valve body to allow the second coolant in the second cooling passage to flow through the first branch, the control method further includes: After the motor module is in the driving state for a third preset time, obtaining the temperature of the first coolant; When the temperature of the first coolant is greater than a seventh limit temperature, the pump body is controlled to allow the first coolant to flow through the motor module via the first cooling passage, and the valve body is controlled to allow the second coolant in the second cooling passage to flow through the first branch; or After the motor module is in the driving state for a third preset time, obtaining the temperature of the motor module; When the temperature of the motor module is greater than a second limit temperature, the pump body is controlled to allow the first coolant to flow through the motor module through the first cooling passage, and the valve body is controlled to allow the second coolant in the second cooling passage to flow through the first branch.

20. The control method according to claim 18, characterized in that: When the temperature of the second coolant is lower than the third limit temperature, the temperature of the motor module is lower than the second limit temperature, and the temperature of the first coolant is lower than the fifth limit temperature, after controlling the pump body to allow the first coolant to flow through the motor module via the first cooling passage, and controlling the valve body to allow the second coolant in the second cooling passage to flow through the second branch, the control method further includes: After the motor module is in the driving state for a fourth preset time, obtaining the temperature of the first coolant; When the temperature of the first coolant is greater than a sixth limit temperature, the pump body is controlled to stop the first coolant from flowing through the first cooling passage, and the valve body is controlled to allow the second coolant in the second cooling passage to flow through the first branch; or After the motor module is in the driving state for a fourth preset time, obtaining the temperature of the motor module; When the temperature of the motor module is greater than a second limit temperature, the pump body is controlled to stop the first coolant from flowing through the first cooling passage, and the valve body is controlled to allow the second coolant in the second cooling passage to flow through the first branch.

21. The control method according to claim 20, characterized in that: After controlling the pump body to stop the first coolant from flowing through the first cooling passage, and controlling the valve body to allow the second coolant in the second cooling passage to flow through the first branch, the control method further includes: After waiting for a fifth preset time period, obtaining the temperature of the first coolant; When the temperature of the first coolant is greater than a seventh limit temperature, the pump body is controlled to allow the first coolant to flow through the motor module via the first cooling passage, and the valve body is controlled to allow the second coolant in the second cooling passage to flow through the first branch; or After waiting for a fifth preset time period, obtaining the temperature of the motor module; When the temperature of the motor module is greater than a second limit temperature, the pump body is controlled to allow the first coolant to flow through the motor module through the first cooling passage, and the valve body is controlled to allow the second coolant in the second cooling passage to flow through the first branch.

22. The control method according to any one of claims 15 to 21, characterized in that: After controlling the pump body and the valve body according to the temperature of the second coolant, the temperature of the motor module, and the temperature of the first coolant, the control method further includes: After waiting for a sixth preset time period, obtaining the temperature of the motor module; When the temperature of the motor module is lower than a first limit temperature, maintaining the driving power of the motor module unchanged; When the temperature of the motor module is not less than a first limit temperature, the driving power of the motor module is reduced.

23. A storage medium having a computer program or instruction stored thereon, characterized in that: When the computer program or instruction is executed by a processor, the steps of the control method according to any one of claims 14 to 22 are implemented.

24. A computer program product, characterized in that The method comprises a computer program or instructions, which implement the steps of the control method according to any one of claims 14 to 22 when executed by a processor.

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