An integrated thermal management system and control method for plug-in hybrid commercial vehicles

Abstract

The present application relates to an integrated thermal management system and control method for a plug-in hybrid commercial vehicle, belonging to the field of vehicle thermal management technology. The plug-in hybrid commercial vehicle integrated thermal management system includes a coolant circuit, which includes a multi-way valve, and an electric drive circuit, a battery circuit, and a first liquid pipeline connected to the multi-way valve; a refrigerant circuit, which exchanges heat with the first liquid pipeline through a first heat exchanger; a warm air circuit, which exchanges heat with the refrigerant circuit through a condenser, and exchanges heat with the warm air circuit and the battery circuit through a second heat exchanger. By combining multiple systems such as the electric drive cooling system, the cab air conditioning and heating system, and the battery thermal management system, multiple mode switching can be achieved, which can effectively utilize the waste heat of the motor system to meet the cooling and heating needs, realize battery low-temperature starting, cab heating, battery heating functions, etc., and the battery circuit does not need to be equipped with a heater, reducing system costs.

Description

Technical Field

[0001] The present application relates to the field of vehicle thermal management technology, and in particular to an integrated thermal management system and control method for a plug-in hybrid commercial vehicle. Background Art

[0002] Existing plug-in hybrid commercial vehicles typically require thermal management across multiple systems, including engine cooling, motor and controller cooling, cabin cooling and heating, and battery cooling and heating. Current technologies typically design and control each system independently.

[0003] In the related technology, patent publication number CN117485094A discloses a distributed hybrid commercial vehicle thermal management system and its control method, which couples battery thermal management, a heating system, and an engine cooling system, and can use the engine's waste heat to heat the battery and the cab.

[0004] However, the power battery system and electric drive cooling system are separate and independent. In pure electric driving mode, the battery cannot utilize the waste heat of the electric drive system. Since the engine is not running at this time, the battery must be heated by an additional heating source, resulting in poor energy efficiency. Furthermore, since the engine waste heat cannot be used in pure electric driving mode, an additional PTC is required to meet the battery heating needs. Summary of the Invention

[0005] In response to the shortcomings or one of the shortcomings of the above-mentioned background technology, the embodiments of the present application provide an integrated thermal management system and control method for a plug-in hybrid commercial vehicle, which can combine multiple systems such as the electric drive cooling system, the cab air conditioning and heating system, and the battery thermal management system to achieve multi-mode switching, effectively utilize the waste heat of the motor system, and meet cooling and heating needs.

[0006] In a first aspect, embodiments of the present application provide an integrated thermal management system for a plug-in hybrid commercial vehicle, comprising:

[0007] A coolant circuit, comprising a multi-way valve, and an electric drive circuit, a battery circuit, and a first liquid pipeline connected to the multi-way valve;

[0008] a refrigerant circuit, exchanging heat with the first liquid pipeline via a first heat exchanger;

[0009] The warm air circuit exchanges heat with the refrigerant circuit through a condenser, and the warm air circuit exchanges heat with the battery circuit through a second heat exchanger.

[0010] In the first aspect, in some embodiments, one end of the warm air circuit is connected to the condenser inlet, and the other end is connected to the second heat exchanger outlet via a first three-way valve, and the remaining outlet of the first three-way valve is connected to the condenser inlet;

[0011] The condenser outlet is connected to the second heat exchanger inlet through a second three-way valve, and the remaining outlet of the second three-way valve is connected to the second heat exchanger outlet.

[0012] In the first aspect, in some embodiments, the refrigerant circuit includes a compressor connected to the outlet of the first heat exchanger and the inlet of the condenser, and a first expansion valve connected to the outlet of the condenser and the inlet of the first heat exchanger.

[0013] On the first aspect, in some embodiments, the refrigerant circuit also includes a first stop valve connecting the condenser outlet and the first expansion valve inlet, and a third heat exchanger connected to both ends of the first stop valve, and a second expansion valve is connected between the third heat exchanger inlet and the first stop valve inlet.

[0014] In the first aspect, in some embodiments, the refrigerant circuit further includes a second shut-off valve connecting the compressor inlet and the outlet of the third heat exchanger.

[0015] In the first aspect, in some embodiments, the refrigerant circuit further includes an air conditioning circuit connecting the compressor inlet and the first shut-off valve outlet.

[0016] In the first aspect, some embodiments further include an engine circuit and a main radiator, wherein heat is exchanged between the engine circuit and the heater circuit via a fourth heat exchanger, and two ends of the engine circuit are respectively connected to two ends of the main radiator;

[0017] The coolant circuit also includes a second liquid pipeline connected to the multi-way valve, and a secondary radiator and a four-way valve arranged on the second liquid pipeline. The two ends of the main radiator are connected to the four-way valve and the engine circuit through a third three-way valve.

[0018] On the first aspect, in some embodiments, the multi-way valve is an eight-way valve, the first adjacent interface of the eight-way valve is connected to the electric drive circuit, the first adjacent interface is connected to the battery circuit, the third adjacent interface is connected to the first liquid pipeline, and the fourth adjacent interface is connected to the second liquid pipeline.

[0019] On the first aspect, in some embodiments, the electric drive circuit, battery circuit and warm air circuit are all provided with a pump body for conveying liquid, and the electric drive circuit, battery circuit, refrigerant circuit and the first liquid pipeline are all provided with sensors for detecting liquid pressure and / or temperature.

[0020] In a second aspect, an embodiment of the present application provides a control method for an integrated thermal management system for a plug-in hybrid commercial vehicle. Using any of the above-described integrated thermal management systems for plug-in hybrid commercial vehicles, the control method includes:

[0021] By switching the multi-way valve, the electric drive circuit, the battery circuit, and the first liquid pipeline are connected in series. The first heat exchanger absorbs heat and the condenser releases heat, so that the warm air circuit heats the cab, the electric drive circuit motor cools down, and the battery circuit heats up.

[0022] By switching the multi-way valve, the electric drive circuit and the battery circuit are connected in series, and the heat generated by the operation of the electric drive circuit motor is absorbed by the batteries in the battery circuit, thereby achieving the goal of cooling the electric drive circuit motor and heating the battery in the battery circuit.

[0023] By switching the multi-way valve, the battery circuit and the first liquid pipeline are connected in series, and the first heat exchanger is used to absorb heat to achieve cooling of the battery circuit batteries;

[0024] By switching the multi-way valve, the electric drive circuit and the second liquid pipeline are connected in series, and the auxiliary radiator is used to dissipate heat to achieve cooling of the electric drive circuit motor.

[0025] By switching the multi-way valve, the battery circuit and the second liquid pipeline are connected in series, and the auxiliary radiator is used to dissipate heat to achieve battery cooling in the battery circuit;

[0026] By switching the multi-way valve, the electric drive circuit and the first liquid pipeline and the second liquid pipeline are connected in series, the auxiliary radiator is used to dissipate heat, and the first heat exchanger absorbs heat to assist in heat dissipation, thereby achieving cooling of the electric drive circuit motor.

[0027] The beneficial effects of the technical solution provided by this application include:

[0028] An embodiment of the present application provides an integrated thermal management system and control method for a plug-in hybrid commercial vehicle, including a coolant circuit, which includes a multi-way valve, and an electric drive circuit, a battery circuit, and a first liquid pipeline connected to the multi-way valve; a refrigerant circuit, which exchanges heat with the first liquid pipeline through a first heat exchanger; a warm air circuit, which exchanges heat with the refrigerant circuit through a condenser, and exchanges heat with the warm air circuit and the battery circuit through a second heat exchanger.

[0029] Since the multi-way valve couples multiple circuits, it is convenient to achieve series connection between any two or more circuits and multiple mode switching by switching the connection mode of the multi-way valve to meet the needs of different working conditions. That is, by combining multiple systems such as the electric drive cooling system, the cab air conditioning and heating system, and the battery thermal management system, multiple mode switching can be achieved, which can effectively utilize the waste heat of the motor system to meet the cooling and heating needs, realize low-temperature battery starting, cab heating, battery heating functions, etc., and the battery circuit does not need to be equipped with a heater, reducing system costs. BRIEF DESCRIPTION OF THE DRAWINGS

[0030] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the following briefly introduces the drawings required for use in the description of the embodiments. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without any creative work.

[0031] Figure 1 This is a schematic diagram of the structure of the thermal management system according to an embodiment of the present application;

[0032] Figure 2 This is a schematic structural diagram of a refrigerant circuit according to an embodiment of the present application;

[0033] Figure 3 A schematic diagram of the layout of the vehicle thermal management system according to an embodiment of the present application;

[0034] Figure 4 This is a simplified diagram of energy interactions among different systems in an embodiment of the present application.

[0035] In the accompanying drawings, the components represented by the reference numerals are as follows:

[0036] 1. Multi-way valve; 2. Electric drive circuit; 3. Battery circuit; 4. First heat exchanger; 5. Warm air circuit; 6. Condenser; 7. Second heat exchanger; 8. First three-way valve; 9. Second three-way valve; 10. Compressor; 11. First expansion valve; 12. First stop valve; 13. Third heat exchanger; 14. Second expansion valve; 15. Second stop valve; 16. Air conditioning circuit; 17. Engine circuit; 18. Main radiator; 19. Fourth heat exchanger; 20. Auxiliary radiator; 21. Four-way valve; 22. Third three-way valve; 23. Pump body; 24. Sensor; 25. Gas-liquid separator; 26. One-way valve; 27. Heater; 28. Proportional control valve. DETAILED DESCRIPTION

[0037] To make the purpose, technical solutions, and advantages of the embodiments of this application more clear, the technical solutions in the embodiments of this application will be clearly and completely described below in conjunction with the drawings in the embodiments of this application. Obviously, the described embodiments are part of the embodiments of this application, not all of the embodiments. Based on the embodiments in this application, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of this application.

[0038] In response to the shortcomings or one of the shortcomings of the above-mentioned background technology, the embodiments of the present application provide an integrated thermal management system and control method for a plug-in hybrid commercial vehicle, which can combine multiple systems such as the electric drive cooling system, the cab air conditioning and heating system, and the battery thermal management system to achieve multi-mode switching, effectively utilize the waste heat of the motor system, and meet cooling and heating needs.

[0039] See also Figures 1 to 2 As shown, the first aspect of the embodiment of the present application provides an integrated thermal management system for a plug-in hybrid commercial vehicle, comprising:

[0040] A coolant circuit, comprising a multi-way valve 1, an electric drive circuit 2, a battery circuit 3, and a first liquid pipeline connected to the multi-way valve 1;

[0041] The refrigerant circuit exchanges heat with the first liquid pipeline via the first heat exchanger 4;

[0042] The warm air circuit 5 exchanges heat with the refrigerant circuit through the condenser 6 , and the warm air circuit 5 exchanges heat with the battery circuit 3 through the second heat exchanger 7 .

[0043] The integrated thermal management system for plug-in hybrid commercial vehicles of the embodiment of the present application couples multiple circuits through a multi-way valve 1, and conveniently realizes series connection between any two or more circuits by switching the connection mode of the multi-way valve 1, realizes multiple mode switching, and meets the requirements of different working conditions.

[0044] For example, in this embodiment, the multi-way valve 1 is coupled to the electric drive circuit 2, the battery circuit 3, and the first liquid pipeline. The first liquid pipeline exchanges heat with the refrigerant circuit through the first heat exchanger 4, and the warm air circuit 5 exchanges heat with the refrigerant circuit through the condenser 6. At the same time, heat is exchanged between the warm air circuit 5 and the battery circuit 3 through the second heat exchanger 7.

[0045] By switching the multi-way valve 1, the electric drive circuit 2, the battery circuit 3, and the first liquid pipeline can be connected in series. The refrigerant circuit is in operation, so that the first heat exchanger 4 absorbs the heat generated by the operation of the motor of the electric drive circuit 2. At the same time, the heat generated by the operation of the motor can heat the battery of the battery circuit 3. The condenser 6 releases heat to heat the heater core of the warm air circuit 5, so that the warm air circuit 5 heats the cab, the electric drive circuit 2 motor cools down, and the battery of the battery circuit 3 heats up.

[0046] By switching the multi-way valve 1, the electric drive circuit 2 and the battery circuit 3 are connected in series, and the batteries in the battery circuit 3 absorb the heat generated by the operation of the motor of the electric drive circuit 2, thereby achieving the goal of cooling the motor of the electric drive circuit 2 and heating the batteries in the battery circuit 3;

[0047] By switching the multi-way valve 1, the electric drive circuit 2 and the first and second liquid pipelines are connected in series, so that the auxiliary radiator 20 dissipates heat and the first heat exchanger 4 absorbs heat. At this time, the heater circuit 5 can prevent the heater core from heating up due to the heat release of the condenser 6 by closing the valve or pump body 23, thereby independently cooling the motor of the electric drive circuit 2.

[0048] By switching the multi-way valve 1, the battery circuit 3 and the first liquid pipeline are connected in series, and the first heat exchanger 4 is used to absorb heat. At this time, the warm air circuit 5 can prevent the heating core from heating up due to the heat release of the condenser 6 by closing the valve or pump body 23, thereby independently cooling the batteries in the battery circuit 3.

[0049] It should be noted that the refrigerant circuit can be connected to the air-conditioning circuit 16 to meet the driving cooling needs. This application couples multiple circuits through the multi-way valve 1 to achieve the ability to transfer the waste heat of the electric drive circuit to any circuit, thereby effectively utilizing the waste heat of the electric drive circuit.

[0050] That is, this application designs an integrated thermal management system architecture that can combine multiple systems such as the electric drive cooling system, the cab air conditioning and heating system, the battery thermal management system, etc., to achieve multi-mode switching, effectively utilize the waste heat of the motor system, and meet cooling and heating needs.

[0051] In some optional embodiments, see Figures 1 to 2 As shown, the embodiment of the present application provides an integrated thermal management system for a plug-in hybrid commercial vehicle. One end of the warm air circuit 5 of the plug-in hybrid commercial vehicle integrated thermal management system is connected to the inlet of the condenser 6, and the other end is connected to the outlet of the second heat exchanger 7 through the first three-way valve 8. The remaining outlet of the first three-way valve 8 is connected to the inlet of the condenser 6;

[0052] The outlet of the condenser 6 is connected to the inlet of the second heat exchanger 7 through the second three-way valve 9 , and the remaining outlet of the second three-way valve 9 is connected to the outlet of the second heat exchanger 7 .

[0053] The warm air circuit 5 of the integrated thermal management system for the plug-in hybrid commercial vehicle in the embodiment of the present application is provided with a first three-way valve 8 and a second three-way valve 9. The bypass of the first three-way valve 8 is connected to the inlet of the condenser 6. When the heater core of the warm air circuit 5 does not need to be heated, the first three-way valve 8 can switch the bypass to allow the coolant in the circuit to flow directly back to the condenser 6, thereby avoiding heat exchange and temperature rise of the heater core of the warm air circuit 5.

[0054] Conversely, when the heater core of the warm air circuit 5 needs to be heated, the first three-way valve 8 can be controlled to switch back to the main circuit. Furthermore, by controlling the valve opening of the first three-way valve 8, the flow rate of the main circuit and the bypass circuit can be controlled, thereby controlling the heating speed and temperature of the heater core of the warm air circuit 5.

[0055] The bypass of the second three-way valve 9 is connected to the outlet of the second heat exchanger 7. When the heat required to heat up the batteries in the battery circuit 3 is insufficient, the main path of the second three-way valve 9 can be switched so that the coolant flows directly through the second heat exchanger 7 to achieve heat exchange with the battery circuit 3 and make up for the heat shortage.

[0056] On the contrary, when the heat required for heating the batteries in the battery circuit 3 can be met by the waste heat of the motor in the electric drive circuit 2, the bypass of the second three-way valve 9 can be switched to allow the coolant to bypass the second heat exchanger 7 and return to the condenser 6, so that the battery circuit 3 does not need to be equipped with a heater to assist in heating the batteries.

[0057] In some optional embodiments, see Figures 1 to 2 As shown, an embodiment of the present application provides an integrated thermal management system for a plug-in hybrid commercial vehicle. The refrigerant circuit of the integrated thermal management system for the plug-in hybrid commercial vehicle includes a compressor 10 connected to the outlet of the first heat exchanger 4 and the inlet of the condenser 6, and a first expansion valve 11 connected to the outlet of the condenser 6 and the inlet of the first heat exchanger 4.

[0058] The refrigerant circuit of the integrated thermal management system for a plug-in hybrid commercial vehicle in an embodiment of the present application includes a compressor 10, a condenser 6, a first expansion valve 11, and a first heat exchanger 4 connected in series. When the compressor 10 is working, the first expansion valve 11 is opened, so that the first heat exchanger 4 absorbs heat from the outside and the condenser 6 releases heat to the outside.

[0059] For example, by switching the multi-way valve 1, the electric drive circuit 2, the battery circuit 3, and the first liquid pipeline can be connected in series, and the pump body 23 is used to drive the coolant circulation of the series circuit. The waste heat generated by the operation of the motor of the electric drive circuit 2 heats the coolant, and the coolant passes through the battery of the battery circuit 3, thereby heating the battery.

[0060] At the same time, part of the waste heat is absorbed by the first heat exchanger 4 into the refrigerant circuit, and is released from the condenser 6 after being amplified by the work of the compressor 10 of the refrigerant circuit. The pump body 23 is used to drive the coolant circulation of the warm air circuit 5. The warm air circuit 5 transfers the heat released by the condenser 6 back to the battery circuit 3 through the second heat exchanger 7 to supplement the lack of battery waste heat, thereby realizing the heating of the cab by the warm air circuit 5, the cooling of the motor in the electric drive circuit 2, and the heating of the battery in the battery circuit 3.

[0061] In some optional embodiments, see Figures 1 to 2 As shown, an embodiment of the present application provides an integrated thermal management system for a plug-in hybrid commercial vehicle. The refrigerant circuit of the integrated thermal management system for the plug-in hybrid commercial vehicle also includes a first stop valve 12 connecting the outlet of the condenser 6 and the inlet of the first expansion valve 11, and a third heat exchanger 13 connected to both ends of the first stop valve 12. A second expansion valve 14 is connected between the inlet of the third heat exchanger 13 and the inlet of the first stop valve 12.

[0062] The third heat exchanger 13 of the integrated thermal management system for a plug-in hybrid commercial vehicle in the embodiment of the present application is an external radiator installed on the vehicle. By closing the first stop valve 12 and cutting off the refrigerant passage, the refrigerant can pass through the second expansion valve 14 and the third heat exchanger 13, thereby utilizing the third heat exchanger 13 to absorb heat from the outside air.

[0063] It should be noted that when the multi-way valve 1 is switched to connect the electric drive circuit 2, the battery circuit 3, and the first liquid pipeline in series, and the first stop valve 12 is closed, the third heat exchanger 13 can be used to absorb heat from the outside air, thereby preventing the first heat exchanger 4 from absorbing excessive heat and causing the battery in the battery circuit 3 to fail to heat up.

[0064] In some optional embodiments, see Figures 1 to 2 As shown, an embodiment of the present application provides an integrated thermal management system for a plug-in hybrid commercial vehicle. The refrigerant circuit of the integrated thermal management system for the plug-in hybrid commercial vehicle further includes a second shut-off valve 15 connecting the inlet of the compressor 10 and the outlet of the third heat exchanger 13.

[0065] The refrigerant circuit of the integrated thermal management system for the plug-in hybrid commercial vehicle in the embodiment of the present application further includes a second stop valve 15 connecting the inlet of the compressor 10 and the outlet of the third heat exchanger 13 , by opening the second stop valve 15 and the second expansion valve 14 and closing the first stop valve 12 and the first expansion valve 11 .

[0066] Therefore, when the compressor 10 is working, the refrigerant can return to the compressor 10 directly through the second stop valve 15 after passing through the condenser 6, the second expansion valve 14 and the third heat exchanger 13. In this state, the third heat exchanger 13 absorbs heat from the outside air and can use the condenser 6 alone to release heat to heat the heater core of the warm air circuit 5.

[0067] In some optional embodiments, see Figures 1 to 2 As shown, an embodiment of the present application provides an integrated thermal management system for a plug-in hybrid commercial vehicle. The refrigerant circuit of the integrated thermal management system for the plug-in hybrid commercial vehicle also includes an air-conditioning circuit 16 connecting the inlet of the compressor 10 and the outlet of the first shut-off valve 12.

[0068] The refrigerant circuit of the integrated thermal management system for the plug-in hybrid commercial vehicle of the embodiment of the present application also includes an air-conditioning circuit 16 connected to the inlet of the compressor 10 and the outlet of the first shut-off valve 12. Exemplarily, the air-conditioning circuit 16 includes an evaporator and an electronic expansion valve, the evaporator inlet is connected to the electronic expansion valve, the evaporator outlet is connected to the compressor 10, and the electronic expansion valve outlet is connected to the outlet of the second shut-off valve 15.

[0069] By closing the first expansion valve 11, the second expansion valve 14 and the second stop valve 15, and opening the electronic expansion valve and the first stop valve 12, a refrigerant circulation circuit is formed among the compressor 10, the condenser 6, the first stop valve 12, the electronic expansion valve and the evaporator, and the evaporator can be used to absorb heat to achieve cab cooling.

[0070] In some optional embodiments, see Figures 1 to 2 As shown, the embodiment of the present application provides an integrated thermal management system for a plug-in hybrid commercial vehicle, which further includes an engine circuit 17 and a main radiator 18. Heat is exchanged between the engine circuit 17 and the heater circuit 5 via a fourth heat exchanger 19. The two ends of the engine circuit 17 are respectively connected to the two ends of the main radiator 18.

[0071] The coolant circuit also includes a second liquid pipeline connected to the multi-way valve 1, and a secondary radiator 20 and a four-way valve 21 arranged on the second liquid pipeline. The two ends of the main radiator 18 are connected to the four-way valve 21 and the engine circuit 17 through a third three-way valve 22.

[0072] The main radiator 18 of the integrated thermal management system for plug-in hybrid commercial vehicles in this embodiment of the present application is located at the front of the vehicle. When the vehicle is in motion, the main radiator 18 can dissipate heat facing the wind. Specifically, the main radiator 18 is connected in series with the engine circuit 17. This allows the main radiator 18 to cool the engine circuit 17. Simultaneously, heat is exchanged between the engine circuit 17 and the heater circuit 5 via the fourth heat exchanger 19. This allows the engine's waste heat to be used to heat the heater core of the heater circuit 5, effectively utilizing the engine's waste heat.

[0073] Furthermore, multi-way valve 1 is connected to a second liquid line, which is equipped with a secondary radiator 20 and a four-way valve 21. The two ends of main radiator 18 are connected to four-way valve 21 and engine circuit 17 via third three-way valves 22. In hybrid mode, main radiator 18 and secondary radiator 20 are disconnected. Main radiator 18 dissipates heat for the engine, while secondary radiator 20 can be connected to the electric drive circuit 2 and / or battery circuit 3 in series via multi-way valve 1 to dissipate heat for the electric drive circuit 2 and / or battery circuit 3.

[0074] At the same time, further, when the entire vehicle is running in pure electric mode and the engine is not working, by switching the four-way valve 21 and the third three-way valve 22, the main radiator 18 and the auxiliary radiator 20 can be connected in series, and the main radiator 18 at the front of the vehicle and the auxiliary radiator 20 on the body side can be effectively used to dissipate heat for the electric drive circuit 2 and / or the battery circuit 3, so as to improve the utilization rate of the main radiator 18 at the front of the vehicle.

[0075] For example, the auxiliary radiator 20 in this embodiment can be arranged on the side of the external third heat exchanger 13. When the third heat exchanger 13 is working, it can absorb the heat released by the auxiliary radiator 20 and improve the heat dissipation efficiency of the auxiliary radiator 20. At the same time, a fan can be set on the side of the auxiliary radiator 20 away from the third heat exchanger 13 to assist in heat dissipation.

[0076] In some optional embodiments, see Figures 1 to 2 As shown, an embodiment of the present application provides an integrated thermal management system for a plug-in hybrid commercial vehicle. The multi-way valve 1 of the integrated thermal management system of the plug-in hybrid commercial vehicle is an eight-way valve. The first adjacent interface of the eight-way valve is connected to the electric drive circuit 2, the first adjacent interface is connected to the battery circuit 3, the third adjacent interface is connected to the first liquid pipeline, and the fourth adjacent interface is connected to the second liquid pipeline.

[0077] The multi-way valve 1 of the integrated thermal management system of the plug-in hybrid commercial vehicle in the embodiment of the present application is an eight-way valve. By switching the connection mode of the multi-way valve 1, series connection between any two or more circuits can be achieved, and multiple mode switching can be realized to meet the requirements of different working conditions.

[0078] In some optional embodiments, see Figures 1 to 2 As shown, an embodiment of the present application provides an integrated thermal management system for a plug-in hybrid commercial vehicle, wherein the electric drive circuit 2, the battery circuit 3 and the heater circuit 5 of the integrated thermal management system of the plug-in hybrid commercial vehicle are all provided with a pump body 23 for conveying liquid, and the electric drive circuit 2, the battery circuit 3, the refrigerant circuit and the first liquid pipeline are all provided with a sensor 24 for detecting liquid pressure and / or temperature.

[0079] The electric drive circuit 2, battery circuit 3 and heater circuit 5 of the integrated thermal management system for plug-in hybrid commercial vehicles of the embodiment of the present application are all provided with a pump body 23 for conveying liquid. The electric drive circuit 2, battery circuit 3, refrigerant circuit and the first liquid pipeline are all provided with a sensor 24 for detecting liquid pressure and / or temperature. The pump body 23 can circulate the liquid in the circuit, and the sensor 24 can detect the temperature and pressure of the liquid in the circuit.

[0080] It should be noted that the delivery direction of the pump body 23 can be set according to the actual working conditions, and the sensor 24 can be arranged close to the inlet and outlet of the motor of the electric drive circuit 2, the compressor 10 of the refrigerant circuit or the battery of the battery circuit 3, so as to facilitate the control of the actual temperature of the circuit components.

[0081] See also Figures 1 to 2 As shown, a second aspect of the embodiments of the present application provides a control method for an integrated thermal management system for a plug-in hybrid commercial vehicle. Using the integrated thermal management system for a plug-in hybrid commercial vehicle according to any of the above embodiments, the control method includes:

[0082] By switching the multi-way valve 1, the electric drive circuit 2, the battery circuit 3, and the first liquid pipeline are connected in series. The first heat exchanger 4 absorbs heat and the condenser 6 releases heat, so that the warm air circuit 5 heats the cab, the electric drive circuit 2 motor cools down, and the battery circuit 3 heats up.

[0083] By switching the multi-way valve 1, the electric drive circuit 2 and the battery circuit 3 are connected in series, and the batteries in the battery circuit 3 absorb the heat generated by the operation of the motor of the electric drive circuit 2, thereby achieving the goal of cooling the motor of the electric drive circuit 2 and heating the batteries in the battery circuit 3;

[0084] By switching the multi-way valve 1, the battery circuit 3 and the first liquid pipeline are connected in series, and the first heat exchanger 4 is used to absorb heat to achieve cooling of the batteries in the battery circuit 3;

[0085] By switching the multi-way valve 1, the electric drive circuit 2 and the second liquid pipeline are connected in series, and the auxiliary radiator 20 is used to dissipate heat, thereby achieving cooling of the motor of the electric drive circuit 2.

[0086] By switching the multi-way valve 1, the battery circuit 3 and the second liquid pipeline are connected in series, and the auxiliary radiator 20 is used to dissipate heat, thereby cooling the batteries in the battery circuit 3;

[0087] By switching the multi-way valve 1, the electric drive circuit 2 and the first liquid pipeline and the second liquid pipeline are connected in series, and the auxiliary radiator 20 is used to dissipate heat. At the same time, the first heat exchanger 4 absorbs heat to assist in heat dissipation, thereby achieving cooling of the motor in the electric drive circuit 2;

[0088] The control method of the embodiment of the present application adopts the multi-way valve 1 as an eight-way valve. By switching the connection mode of the multi-way valve 1, series connection between any two or more circuits can be achieved, and multiple mode switching can be achieved to meet the requirements of different working conditions.

[0089] For example, by combining and decomposing the functions of the components of this system, the following working modes can be achieved:

[0090]

[0091]

[0092] Note: Battery cooling means that the compressor 10 is turned on and the first heat exchanger 4 is used to reduce the coolant temperature; battery heat dissipation can be achieved by switching the eight-way valve in series with the main and auxiliary radiators to reduce the coolant temperature;

[0093] The working conditions of each component in several typical working modes are as follows:

[0094] a) Hybrid driving mode: Cabin cooling, battery cooling, electric drive cooling

[0095] When the ambient temperature is high and the hybrid mode is used, the eight-way valves AG, DH, FC, and BE are connected respectively, and the four-way valves ab and cd are connected, so that the battery circuit 3 is connected in series with the first liquid circuit where the first heat exchanger 4 is located. At the same time, the electric drive circuit 2 is connected in series with the second liquid circuit where the auxiliary radiator 20 is located. The compressor 10 is controlled to operate, the first stop valve 12 and the second stop valve 15 are closed, the fan next to the auxiliary radiator 20 is turned on, the pump body 23 of the battery circuit 3 and the electric drive circuit 2 is running, the opening of the expansion valve of the air-conditioning circuit 16 is adjusted according to the cooling demand, and the two third three-way valves 22 are switched to bypass and connect to the engine circuit 17.

[0096] At this time, the engine circuit 17, the electric drive circuit 2 and the battery circuit 3 are independent. The engine dissipates heat through the main radiator 18, the coolant of the electric drive circuit 2 is cooled and dissipated through the auxiliary radiator 20 and the fan, and the battery coolant is cooled through the first heat exchanger 4.

[0097] b) Pure electric driving mode: electric drive self-circulation, battery heat dissipation

[0098] When the ambient temperature is low, the eight-way valves AD, GE, FH, and BC are connected, and bd and ac of the four-way valve 21 are connected respectively, so that the battery circuit 3 is connected in series with the second liquid circuit where the auxiliary radiator 20 is located, and the electric drive circuit 2 constitutes an independent self-circulating circuit. At the same time, the four-way valve 21 is switched, and the two third three-way valves are connected to the main circuit where the four-way valve 21 is located, so that the main radiator 18 and the auxiliary radiator 20 are connected in series.

[0099] At this time, the coolant in the battery circuit 3 is cooled by the main radiator 18 and the auxiliary radiator 20. The fan at the auxiliary radiator 20 can be turned on and the speed adjusted according to the temperature detected by the sensor 24 at the inlet and outlet of the auxiliary radiator 20. After the temperature of the electric drive circuit 2 rises to the point where heat dissipation is required, the pump body 23 of the electric drive circuit 2 is turned on and enters the self-circulation mode.

[0100] c) Pure electric driving mode: cab heating, electric drive cooling, battery heating

[0101] When the ambient temperature is low and the vehicle is driven in pure electric mode, when the temperature of the electric drive circuit 2 is low, the eight-way valves AF, BE, CD, and GH are connected respectively, so that the electric drive circuit 2 and the battery circuit 3 are simultaneously connected in series with the first liquid circuit where the first heat exchanger 4 is located, and the two third three-way valves 22 are switched so that the third three-way valve 22 is connected to the bypass to connect to the engine circuit 17, so that the pump body 23 is running and the proportional control valve 28 is opened. At this time, the electric drive circuit 2 is connected in series with the battery circuit 3, and the waste heat of the electric drive can be used to heat the battery. At the same time, the compressor 10 is running and the first stop valve 12 is opened. At this time, the waste heat of the electric drive is transferred to the refrigerant side through the first heat exchanger 4, and then transferred to the small circuit of the heating system through the condenser 6 after work amplification by the compressor 10.

[0102] The small circuit of the warm air system is a circuit composed of the condenser 6, the second three-way valve 9, the second heat exchanger 7, the fourth heat exchanger 19 and the first three-way valve 8. According to the needs, the main road is switched through the first three-way valve 8 to connect to the warm air circuit 5 to heat the cab, and the second three-way valve 9 can be switched according to the situation to control the second heat exchanger 7 to heat the coolant of the battery circuit 3 to supplement the lack of waste heat of the electric drive; when the temperature of the series circuit rises to meet the battery requirements, the second three-way valve 9 can be switched to take the bypass branch without passing through the second heat exchanger 7; after the temperature rises further, the eight-way valves AF, DH, GC, and BE are connected respectively, so that the four circuits connected by the eight-way valves are connected in series at the same time, and the fan beside the auxiliary radiator 20 is used to dissipate heat to control the water temperature to meet the battery heating water inlet requirements.

[0103] d) Hybrid driving mode: cabin heating, electric drive cooling, battery cooling

[0104] In this mode, the eight-way valves AG, DH, BE, and CF are connected respectively, so that the battery circuit 3 is connected in series with the first liquid circuit where the first heat exchanger 4 is located, and the electric drive circuit 2 is connected in series with the second liquid circuit where the auxiliary radiator 20 is located. The two third three-way valves 22 are connected to the bypass to connect the engine circuit 17, the compressor 10 is working, the side fan of the auxiliary radiator 20 is turned on, the pump body 23 is running, and the proportional control valve 28 is opened. The coolant of the engine circuit 17 heats the coolant of the warm air circuit 5 through the fourth heat exchanger 19 to achieve cab heating, and is cooled through the main radiator 18; the second three-way valve 9 is switched to take the bypass branch without passing through the second heat exchanger 7. The coolant of the electric drive circuit 2 is cooled and dissipated through the auxiliary radiator 20 and the side fan, and the coolant of the battery circuit 3 is cooled through the first heat exchanger 4.

[0105] Exemplarily, the control principle is as follows:

[0106] See also Figures 1 to 4 , Figure 1 The dotted box covers the corresponding parts Figure 3 The integrated unit in Figure 4 The electric drive system corresponds to electric drive circuit 2, the battery system corresponds to battery circuit 3, the heater system corresponds to heater circuit 5, and the engine system corresponds to engine circuit 17. That is, through the integrated unit, one unit can be used to realize the energy interaction of the electric drive system, battery system, air conditioning and heater system, and engine system. In order to make efficient use of the energy of the entire vehicle, it is also necessary to set the corresponding control strategies and programs in advance to meet the functions of the entire vehicle while improving energy consumption economy.

[0107] The program requires inputs including the vehicle's operating mode, operating status, ambient temperature, vehicle speed, temperatures of components requiring cooling in the electric drive system, battery management system status requests, cabin cooling or heating requests, and internal coolant temperature and pressure. The control program analyzes this data, determines the current function mode required by the thermal management unit based on the aforementioned mode list, and controls the components according to the pre-defined mode.

[0108] Consider a typical operating condition for a vehicle using this solution. This vehicle is used in low-temperature regions and requires driving uphill before descending. During this uphill driving condition, the battery temperature is 3°C and the motor and electronic control temperature is -2°C. The driver selects hybrid mode and cab heating. The vehicle controller determines that the battery requires heating, while the electric drive system does not require cooling. Therefore, cab heating is required. The water temperature in battery circuit 3 and heater circuit 5 are relatively low. Based on this, the thermal management system determines that operating mode 13 is being entered. In this state, pumps 23 in battery circuit 3 and electric drive circuit 2 operate, and eight-way valves AD, GH, FC, and BE are connected, placing battery circuit 3 in series with the first liquid circuit, where the first heat exchanger 4 resides. The electric drive circuit 2 forms a self-circulating, independent circuit. Proportional control valve 28 opens, pump 23 operates, and two third three-way valves 22 connect the main circuit to the engine circuit 17. Heater 27 activates to facilitate rapid temperature increase and then shuts down as the water temperature in heater circuit 5 rises. At this time, the electric drive circuit 2 stores heat in its own cycle, and the battery and the heating system both use the waste heat of the engine circuit 17 to heat up.

[0109] The vehicle then proceeds downhill, with the battery temperature reaching 16°C and the electric drive controller at a high temperature. The driver uses pure electric mode, and the cab is heated. At this point, operating mode 17 is determined to have been entered, and the multi-way valve is switched, so that the battery circuit 3 forms a self-circulating independent circuit. The electric drive circuit 2 is connected in series with the first heat exchanger 4 and the auxiliary radiator 20, with AB, GC, DH, and EF connected. The ac and bd terminals of the four-way valve 21 are connected separately. The fan next to the auxiliary radiator 20 is turned on and its speed is adjusted based on the outlet water temperature. The proportional control valve 28 is closed, the pump 23 of the battery circuit 3 is operating, and the compressor 10 is turned on. At this time, the waste heat from the electric drive is transferred to the refrigerant side through the first heat exchanger 4. After being amplified by the work of the compressor 10, it is transferred to the warm air circuit through the condenser 6 to heat the cab. The second three-way valve 9 is connected to the bypass branch, bypassing the second heat exchanger 7. The first three-way valve 8 is connected to the main circuit, allowing the warm air circuit to heat the cab. At this time, the electric drive circuit 2 uses the auxiliary radiator 20 to dissipate heat, and the battery circuit 3 circulates itself, thereby utilizing the residual heat of the motor to assist the cab.

[0110] Compared with the existing technical solutions, the key technical points of this application include:

[0111] 1. This application realizes the energy flow of the electric drive system, battery system, driving cooling system, driving heating system and engine system through multiple heat exchangers and valve assemblies, while meeting the requirements of the vehicle in pure electric driving mode and reducing the number of parts;

[0112] 2. This application analyzes the status and needs of the entire vehicle and sets up a variety of different working modes. While meeting the thermal management needs of the entire vehicle, it can use the lowest energy consumption mode to work, thereby improving the energy economy of the entire vehicle.

[0113] Among them, in operating mode 1, the electric drive circuit 2 dissipates heat through the auxiliary radiator 20, the engine dissipates heat through the main radiator 18, the refrigerant dissipates heat through the third heat exchanger 13, and the air-conditioning circuit 16 is used to cool the cab as needed, and the battery circuit 3 coolant is cooled through the first heat exchanger 4 to cool the battery.

[0114] In operating mode 18, the electric drive circuit 2 stores heat, and the waste heat of the motor is transferred to the refrigerant side circuit through the first heat exchanger 4. On the one hand, the refrigerant side can use the third heat exchanger 13 to absorb heat from the air. On the other hand, it can absorb the waste heat of the motor through the first heat exchanger 4 and transfer it to the warm air circuit 5 through the condenser 6 to heat the cab.

[0115] When the battery needs to be heated, the second three-way valve 9 can be switched to connect the second heat exchanger 7 of the main circuit according to the situation, so as to use the heat pump formed by the circuit where the condenser 6 is located to complete the heating;

[0116] When the coolant temperature of the electric drive circuit 2 further increases, the eight-way valves BE, AF, and CD are connected respectively, so that the battery circuit 3 and the electric drive circuit 2 can be connected in series, allowing the coolant of the electric drive circuit 2 to flow directly through the battery, and the insufficient temperature is then supplemented by the second heat exchanger 7;

[0117] When the coolant at the outlet of the electric drive circuit 2 rises further, the eight-way valves BE, AF, CG, and DH are connected respectively, adjusting the battery circuit 3 to be connected in series with the electric drive circuit 2, and connecting the circuit where the auxiliary radiator 20 is located in series with the battery circuit 3 to control the inlet battery temperature to meet the requirements;

[0118] When the coolant temperature at the outlet of the electric drive circuit 2 rises further and the auxiliary radiator 20 cannot control the coolant temperature to meet the battery requirements, the eight-way valves AB, GC, and DH are connected respectively, the battery circuit 3 is disconnected from the electric drive circuit 2, and the electric drive circuit 2 uses the auxiliary radiator 20 to dissipate heat. The residual heat is transferred to the refrigerant side through the first heat exchanger 4, then to the warm air circuit 5 through the condenser 6, and finally to the battery circuit 3 through the second heat exchanger 7.

[0119] In the description of this application, it should be noted that the terms "upper" and "lower" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on this application. Unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or an indirect connection through an intermediate medium, or it can be internal communication between two elements. For those of ordinary skill in the art, the specific meanings of the above terms in this application can be understood according to the specific circumstances.

[0120] It should be noted that, in this application, relational terms such as "first" and "second" are used only to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any actual relationship or order between these entities or operations. Moreover, the terms "include", "comprise" or any other variants thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device comprising a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or device. In the absence of further restrictions, an element defined by the sentence "comprising a ..." does not exclude the presence of other identical elements in the process, method, article or device comprising the element.

[0121] The foregoing is merely a list of specific embodiments of the present application, intended to enable those skilled in the art to understand or implement the present application. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the present application. Therefore, the present application is not limited to the embodiments shown herein, but is intended to conform to the broadest scope consistent with the principles and novel features of the present application.

Claims

1. An integrated thermal management system for plug-in hybrid commercial vehicles, characterized in that: include: A coolant circuit comprising a multi-way valve (1), an electric drive circuit (2), a battery circuit (3), and a first liquid pipeline connected to the multi-way valve (1); A refrigerant circuit, which exchanges heat with the first liquid pipeline via a first heat exchanger (4); A warm air circuit (5) exchanges heat with the refrigerant circuit via a condenser (6), and a second heat exchanger (7) exchanges heat with the battery circuit (3); It also includes an engine circuit (17) and a main radiator (18), wherein heat is exchanged between the engine circuit (17) and the warm air circuit (5) via a fourth heat exchanger (19), and two ends of the engine circuit (17) are respectively connected to two ends of the main radiator (18); The coolant circuit further includes a second liquid pipeline connected to the multi-way valve (1), and a secondary radiator (20) and a four-way valve (21) provided on the second liquid pipeline. Both ends of the main radiator (18) are connected to the four-way valve (21) and the engine circuit (17) via a third three-way valve (22).

2. The integrated thermal management system for plug-in hybrid commercial vehicles according to claim 1, characterized in that: One end of the warm air circuit (5) is connected to the inlet of the condenser (6), and the other end is connected to the outlet of the second heat exchanger (7) through the first three-way valve (8), and the remaining outlet of the first three-way valve (8) is connected to the inlet of the condenser (6); The outlet of the condenser (6) is connected to the inlet of the second heat exchanger (7) through the second three-way valve (9), and the remaining outlet of the second three-way valve (9) is connected to the outlet of the second heat exchanger (7).

3. The integrated thermal management system for plug-in hybrid commercial vehicles according to claim 1, characterized in that: The refrigerant circuit includes a compressor (10) connected to the outlet of the first heat exchanger (4) and the inlet of the condenser (6), and a first expansion valve (11) connected to the outlet of the condenser (6) and the inlet of the first heat exchanger (4).

4. The integrated thermal management system for a plug-in hybrid commercial vehicle according to claim 3, characterized in that: The refrigerant circuit further includes a first stop valve (12) connected to the outlet of the condenser (6) and the inlet of the first expansion valve (11), and a third heat exchanger (13) connected to both ends of the first stop valve (12), and a second expansion valve (14) is connected between the inlet of the third heat exchanger (13) and the inlet of the first stop valve (12).

5. The integrated thermal management system for a plug-in hybrid commercial vehicle according to claim 4, characterized in that: The refrigerant circuit further includes a second stop valve (15) connecting the inlet of the compressor (10) and the outlet of the third heat exchanger (13).

6. The integrated thermal management system for a plug-in hybrid commercial vehicle according to claim 5, characterized in that: The refrigerant circuit further includes an air conditioning circuit (16) connected to the inlet of the compressor (10) and the outlet of the first stop valve (12).

7. The integrated thermal management system for a plug-in hybrid commercial vehicle according to claim 1, characterized in that: The multi-way valve (1) is an eight-way valve, wherein the first adjacent interface of the eight-way valve is connected to the electric drive circuit (2), the first adjacent interface is connected to the battery circuit (3), the third adjacent interface is connected to the first liquid pipeline, and the fourth adjacent interface is connected to the second liquid pipeline.

8. The integrated thermal management system for a plug-in hybrid commercial vehicle according to claim 1, characterized in that: The electric drive circuit (2), the battery circuit (3) and the warm air circuit (5) are all provided with a pump body (23) for conveying liquid, and the electric drive circuit (2), the battery circuit (3), the refrigerant circuit and the first liquid pipeline are all provided with a sensor (24) for detecting liquid pressure and / or temperature.

9. A control method for an integrated thermal management system for a plug-in hybrid commercial vehicle, using the integrated thermal management system for a plug-in hybrid commercial vehicle according to any one of claims 1 to 8, characterized in that: Control methods include: By switching the multi-way valve (1), the electric drive circuit (2), the battery circuit (3), and the first liquid pipeline are connected in series, and the first heat exchanger (4) absorbs heat and the condenser (6) releases heat, so that the warm air circuit (5) heats the cab, the electric drive circuit (2) cools the motor, and the battery circuit (3) heats the battery; By switching the multi-way valve (1), the electric drive circuit (2) and the battery circuit (3) are connected in series, and the heat generated by the operation of the motor of the electric drive circuit (2) is absorbed by the battery of the battery circuit (3), thereby achieving cooling of the motor of the electric drive circuit (2) and heating of the battery of the battery circuit (3); By switching the multi-way valve (1), the battery circuit (3) and the first liquid pipeline are connected in series, and the first heat exchanger (4) is used to absorb heat to achieve cooling of the battery in the battery circuit (3); By switching the multi-way valve (1), the electric drive circuit (2) and the second liquid pipeline are connected in series, and the auxiliary radiator (20) is used to dissipate heat, thereby achieving cooling of the motor of the electric drive circuit (2); By switching the multi-way valve (1), the battery circuit (3) and the second liquid pipeline are connected in series and the auxiliary radiator (20) is used to dissipate heat, thereby achieving cooling of the battery in the battery circuit (3); By switching the multi-way valve (1), the electric drive circuit (2) and the first liquid pipeline and the second liquid pipeline are connected in series, the auxiliary radiator (20) is used to dissipate heat, and the first heat exchanger (4) absorbs heat to assist in heat dissipation, thereby achieving cooling of the electric drive circuit motor.

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