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CN-117922239-B - Hybrid electric vehicle integrated thermal management system based on multi-way valve

CN117922239BCN 117922239 BCN117922239 BCN 117922239BCN-117922239-B

Abstract

The invention relates to a hybrid electric vehicle integrated thermal management system based on a multi-way valve, and belongs to the technical field of new energy vehicle thermal management systems. The integrated thermal management system of the hybrid electric vehicle comprises a vehicle controller, a battery temperature control module for adjusting the temperature of a battery pack, an engine cooling module for absorbing heat emitted by an engine and carrying waste heat of the engine, and an electric drive cooling module for absorbing heat emitted by a motor and carrying waste heat of the motor. According to the invention, the whole vehicle controller sends heat distribution instructions to the electric drive cooling module, the engine cooling module and the battery temperature control module, when the battery pack and the passenger cabin have heating requirements, the battery pack and the passenger cabin are fully heated by waste heat, and the cooling liquid heat of each loop is coupled into the battery cooling loop in a direct heat exchange mode, so that the waste heat utilization efficiency is improved, and meanwhile, the available waste heat is distributed according to different working modes.

Inventors

  • MENG SHUN
  • ZHANG YU
  • WEI XIAOFEI
  • YAO MINGYAO
  • QIAN YEJIAN
  • QIU LIANG

Assignees

  • 合肥工业大学

Dates

Publication Date
20260505
Application Date
20240308

Claims (8)

  1. 1. Hybrid electric vehicle integrated thermal management system based on multi-way valve, characterized by comprising: the battery temperature control module is provided with a battery cooling loop (3) for conveying cold energy or heat energy to the battery pack, and a six-way valve (33) is arranged on the battery cooling loop (3); An engine cooling module having an engine circuit (4) providing a heat dissipation function for an engine, the engine circuit (4) being in communication with an engine first heating branch (7), the engine first heating branch (7) being for transferring engine residual heat; The electric drive cooling module is provided with an electric drive cooling loop (6) for providing a heat dissipation function for the motor, the electric drive cooling loop (6) is communicated with an electric drive first heating branch (8), and the electric drive first heating branch (8) is used for transmitting motor waste heat; The vehicle control unit sends a heat distribution instruction to the first heating branch (7) of the engine, the first electric drive heating branch (8) and the six-way valve (33) when the battery pack has a heating requirement, and the battery cooling loop (3) and the first heating branch (7) of the engine or the first electric drive heating branch (8) are mutually communicated through the six-way valve (33) so as to heat the battery pack by utilizing motor waste heat or engine waste heat; The engine loop (4) is also communicated with an engine second heating branch (5), the engine second heating branch (5) is used for transmitting engine waste heat, the electric drive cooling loop (6) is also communicated with an electric drive second heating branch (10), and the electric drive second heating branch (10) is used for transmitting motor waste heat; When the passenger cabin has a heating requirement, the whole vehicle controller sends out a heat distribution instruction to the second heating branch (5) of the engine and the second heating branch (10) of the electric drive, and the passenger cabin is heated by utilizing the waste heat of the engine and the waste heat of the motor; The battery cooling loop (3) comprises a first water pump (31), a PTC heater (32) communicated with the first water pump (31), and a first water cooling part (34) which is arranged on the battery pack and is respectively connected with the six-way valve (33) and the first water pump (31); the engine loop (4) comprises a second water pump (41) and a first radiator (44) connected with the second water pump (41); The second heating branch (5) of the engine comprises a bypass pipe arranged at one side of the engine loop (4), and a warm air core (52) for heating the passenger cabin is arranged on the bypass pipe; The electric drive cooling loop (6) comprises a third water pump (61) and a second radiator (62) connected with the third water pump (61); The first heating branch circuit (7) of the engine comprises a first three-way proportional valve (71), the first three-way proportional valve (71) is communicated with the engine loop (4), the second heating branch circuit (5) of the engine and the six-way valve (33), and when the six-way valve (33) is communicated with the first three-way proportional valve (71), a first thermal coupling loop for heating the battery pack is formed between the battery temperature control module and the engine cooling module; The electric drive first heating branch circuit (8) comprises a second three-way proportional valve (81) which is arranged on the electric drive cooling circuit (6) and is communicated with the six-way valve (33), and when the six-way valve (33) is communicated with the second three-way proportional valve (81), a second thermal coupling circuit for heating the battery pack is formed between the battery temperature control module and the electric drive cooling module; the electric drive second heating branch circuit (10) comprises a third three-way proportional valve (101) arranged on the electric drive first heating branch circuit (8), and the third three-way proportional valve (101) is communicated with the second three-way proportional valve (81) and the warm air core (52) and is used for providing motor waste heat for the warm air core (52) so as to heat the passenger cabin.
  2. 2. The integrated thermal management system of a hybrid vehicle according to claim 1, wherein a bypass pipe of the second heating branch (5) of the engine is provided with a third SOV on-off valve (51) and a fourth SOV on-off valve (53), and when the passenger compartment is heated by using the waste heat of the engine, the third SOV on-off valve (51) and the fourth SOV on-off valve (53) are opened, and when the passenger compartment is heated by using the waste heat of the motor, the third SOV on-off valve (51) and the fourth SOV on-off valve (53) are closed.
  3. 3. The hybrid electric vehicle integrated thermal management method based on the multi-way valve is characterized in that the method adopts a waste heat distribution strategy to realize thermal management, and is suitable for the hybrid electric vehicle integrated thermal management system in claim 2, and the waste heat distribution strategy comprises the following steps: Step one, judging whether a battery pack and a passenger cabin have heating requirements or not through a whole vehicle controller; step two, when the whole vehicle controller judges that the battery pack does not have the heating requirement and the passenger cabin has the heating requirement, the passenger cabin is heated by utilizing waste heat; And step three, when the whole vehicle controller judges that the battery pack has the heating requirement, judging whether the waste heat is sufficient, and sending a heat distribution instruction according to the judging result, wherein the heat distribution situation is as follows: The first situation is that the passenger cabin has heating requirements and enough waste heat, and the passenger cabin and the battery pack are heated by the waste heat; Secondly, the passenger cabin has heating requirements and insufficient waste heat, and at the moment, the passenger cabin is heated by the waste heat, and the battery pack is heated by a PTC heater (32) of the battery temperature control module; thirdly, the passenger cabin has no heating requirement and enough waste heat, and the waste heat is utilized to heat the battery pack; And in the fourth case, the passenger cabin has no heating requirement and insufficient waste heat, and the PTC heater (32) of the battery temperature control module is used for heating the battery pack.
  4. 4. The integrated thermal management method of a hybrid vehicle of claim 3, wherein the waste heat distribution strategy is divided into a first waste heat distribution strategy, a second waste heat distribution strategy, and a third waste heat distribution strategy, wherein, When the vehicle enters a pure electric mode, the whole vehicle controller distributes heat by adopting a first waste heat distribution strategy, waste heat in the second step and the third step is motor waste heat, and after the whole vehicle controller sends a heat distribution instruction or judges that the passenger compartment and the battery pack have no heating requirement, the whole vehicle controller judges whether the vehicle is in the pure electric mode or not, if the vehicle is in the pure electric mode, the first to the third steps are repeatedly executed, otherwise, the first waste heat distribution strategy is ended; When the vehicle enters a pure oil mode, the whole vehicle controller distributes heat by adopting a second waste heat distribution strategy, waste heat in the second and third steps is engine waste heat, and after the whole vehicle controller sends a heat distribution instruction or judges that the passenger compartment and the battery pack have no heating requirement, the whole vehicle controller judges whether the vehicle is in the pure oil mode, if the vehicle is in the pure oil mode, the first to third steps are repeatedly executed, otherwise, the second waste heat distribution strategy is ended; When the vehicle enters the hybrid oil-electric mode, the whole vehicle controller distributes heat by adopting a third waste heat distribution strategy, the waste heat in the second step and the third step is motor waste heat or engine waste heat, after the whole vehicle controller sends a heat distribution instruction or after judging that the passenger cabin and the battery pack have no heating requirement, the whole vehicle controller judges whether the vehicle is in the hybrid oil-electric mode, if the vehicle is in the hybrid oil-electric mode, the first step to the third step are repeatedly executed, and otherwise, the third waste heat distribution strategy is ended.
  5. 5. The method for integrated thermal management of a hybrid vehicle of claim 4, wherein when the third waste heat distribution strategy is adopted, if the motor waste heat and the engine waste heat both meet the current heating requirement, the engine waste heat is preferentially used for heating the passenger compartment and/or the battery pack.
  6. 6. The hybrid vehicle integrated thermal management method of claim 4, wherein: When the passenger cabin is heated by utilizing motor waste heat, the third SOV on-off valve (51) and the fourth SOV on-off valve (53) are closed, the second three-way proportional valve (81) is communicated with the third three-way proportional valve (101), the third three-way proportional valve (101) is communicated with the warm air core (52), cooling liquid in the electric drive cooling loop (6) flows through the warm air core (52) to heat the passenger cabin, if the temperature difference between the air outlet temperature of the passenger cabin and the target temperature of the passenger cabin reaches a first set value, the second three-way proportional valve (81) enlarges a valve opening at one side communicated with the second radiator (62), and if the temperature difference between the target temperature of the passenger cabin and the air outlet temperature of the passenger cabin reaches a second set value, the second three-way proportional valve (81) reduces a valve opening at one side communicated with the second radiator (62); When the battery pack is heated by utilizing the waste heat of the motor, the second three-way proportional valve (81) is communicated with the six-way valve (33), the cooling liquid in the electric drive cooling loop (6) flows through the first water cooling part (34) to heat the battery pack, if the temperature difference between the temperature of the cooling liquid at the inlet of the first water cooling part (34) and the preheating target temperature of the cooling liquid at the inlet of the battery pack reaches a third set value, the second three-way proportional valve (81) enlarges the valve opening at one side communicated with the second radiator (62), and if the temperature difference between the preheating target temperature of the cooling liquid at the inlet of the battery pack and the temperature of the cooling liquid at the inlet of the first water cooling part (34) reaches a fourth set value, the second three-way proportional valve (81) reduces the valve opening at one side communicated with the second radiator (62).
  7. 7. The hybrid vehicle integrated thermal management method of claim 4, wherein: when the passenger cabin is heated by utilizing the waste heat of the engine, the third SOV on-off valve (51) and the fourth SOV on-off valve (53) are opened, the cooling liquid in the engine loop (4) flows through the warm air core (52) to heat the passenger cabin, if the temperature difference between the air outlet temperature of the passenger cabin and the target temperature of the passenger cabin reaches a first set value, the valve opening of the third SOV on-off valve (51) and the fourth SOV on-off valve (53) is reduced, and if the temperature difference between the target temperature of the passenger cabin and the air outlet temperature of the passenger cabin reaches a second set value, the valve opening of the third SOV on-off valve (51) and the valve opening of the fourth SOV on-off valve (53) are increased; When the battery pack is heated by utilizing the waste heat of the engine, the first three-way proportional valve (71) is communicated with the six-way valve (33), the cooling liquid in the engine loop (4) flows through the first water cooling part (34) to heat the battery pack, if the temperature difference between the temperature of the cooling liquid at the inlet of the first water cooling part (34) and the preheating target temperature of the cooling liquid at the inlet of the battery pack reaches a third set value, the first three-way proportional valve (71) enlarges the opening of the valve at one side communicated with the first radiator (44), and if the temperature difference between the preheating target temperature of the cooling liquid at the inlet of the battery pack and the temperature of the cooling liquid at the inlet of the first water cooling part (34) reaches a fourth set value, the first three-way proportional valve (71) reduces the opening of the valve at one side communicated with the first radiator (44).
  8. 8. The method for integrated heat management of a hybrid vehicle according to claim 4, wherein when the battery pack is heated by using the waste heat of the engine, the six-way valve (33) is switched to a state in which the battery cooling circuit (3) is connected to or disconnected from the first heating branch (7) of the engine based on different time intervals to adjust the flow rate of the first heating branch (7) of the engine.

Description

Hybrid electric vehicle integrated thermal management system based on multi-way valve Technical Field The invention belongs to the technical field of new energy automobile heat management systems, and particularly relates to a hybrid automobile integrated heat management system based on a multi-way valve. Background The hybrid electric vehicle combines the characteristics of the traditional fuel oil vehicle and the advantages of the pure electric vehicle, and has wide development prospect and market potential. The whole vehicle thermal management system gradually becomes one of important means for saving energy, reducing emission, prolonging the service life of the vehicle and ensuring the performance of core parts in recent years. Compared with a fuel vehicle, the thermal management system of the hybrid electric vehicle also comprises a battery, an electric drive and whole vehicle control system and the like, and comprises a combined heating and cooling mixed mode with a plurality of targets. Compared with an electric vehicle, the hybrid electric vehicle has a plurality of heat sources of an engine, so that the hybrid electric vehicle can utilize various waste heat types, and it is important to reduce energy consumption as much as possible while the waste heat of an engine system, the waste heat of an electric drive system and the heat of a PTC heater are effectively distributed and utilized for realizing heating requirements of the whole vehicle. At present, the waste heat utilization of the hybrid electric vehicle mainly realizes indirect heat exchange of engine cooling liquid through a plate heat exchanger by an engine cooling system circulation branch. The indirect heat exchange mode is in contact with the heat exchange media at two sides through the intermediate heat transfer medium, heat energy is exchanged through the intermediate heat transfer medium, the heat exchange media are not in direct contact, and the indirect heat exchange mode has the characteristics of higher adaptability and stability, but limited heat exchange efficiency. The direct heat exchange mode refers to the direct contact of heat exchange media at two sides, so that the heat transfer efficiency is high, the heat loss is less, the cost is lower, and the indirect heat exchanger is omitted. Some of the control strategies need to be reasonably matched in the aspect of stability, and the control purposes are achieved efficiently. Because the hybrid electric vehicle has various waste heat types, if the waste heat of different systems of the vehicle can be reasonably distributed and utilized, the integration level of the vehicle can be greatly improved, and the energy consumption of the vehicle can be reduced. In addition, the engine coolant operating temperature is typically much greater than the battery pack inlet coolant demand temperature, which requires a reasonable control scheme to ensure that the battery pack inlet coolant is within the demand temperature range. Disclosure of Invention The invention aims to solve the problems and provide a hybrid electric vehicle integrated thermal management system based on a multi-way valve and with reasonable and efficient waste heat distribution. The invention realizes the above purpose through the following technical scheme: a multi-way valve based hybrid vehicle integrated thermal management system comprising: the battery temperature control module is provided with a battery cooling loop conduction for conveying cold or heat to the battery pack, and a six-way valve conduction is arranged on the battery cooling loop conduction; The engine cooling module is provided with an engine loop conduction for providing a heat dissipation function for the engine, wherein the engine loop conduction is communicated with a first heating branch conduction of the engine, and the first heating branch conduction of the engine is used for transmitting engine waste heat; The electric drive cooling module is provided with an electric drive cooling loop conduction for providing a heat dissipation function for the motor, the electric drive cooling loop conduction is communicated with an electric drive first heating branch conduction, and the electric drive first heating branch conduction is used for transmitting motor waste heat; and when the battery pack has a heating requirement, the whole vehicle controller sends a heat distribution instruction to the first heating branch circuit of the engine, the first heating branch circuit of the electric drive and the six-way valve, and the battery cooling loop and the first heating branch circuit of the engine or the first heating branch circuit of the electric drive are conducted and mutually conducted through the six-way valve, so that the battery pack is heated by utilizing the motor waste heat or the engine waste heat. As a further optimization scheme of the invention, the engine loop conduction is also communicated with an engine second heating branch conduction,