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CN-116906165-B - Thermal management system and coolant filling strategy of hybrid vehicle type

CN116906165BCN 116906165 BCN116906165 BCN 116906165BCN-116906165-B

Abstract

The invention discloses a thermal management system of a hybrid vehicle type, which comprises a high-temperature cooling system, a low-temperature cooling system and a battery cooling system which are communicated through pipelines, wherein the high-temperature cooling system comprises an engine, a high-temperature radiator, a proportional three-way valve I, a proportional three-way valve II, a heater, a heat exchanger, a high-pressure heater, an electronic water pump I and an expansion tank I, the low-temperature cooling system and the battery cooling system share the expansion tank II, and the expansion tank I and the expansion tank II are arranged at a filling port of a vehicle cooling liquid to play a role in liquid storage and accumulation, and are used for balancing the operating pressure of the cooling system when the cooling system operates. Through the arrangement of the thermal management system, the cooling system loop can be ensured to be smooth in the process of manually filling the cooling liquid, the blockage of parts such as a water valve and the like is avoided, and the filling quantity of the cooling liquid in the process of manually filling the cooling liquid can be ensured to meet the requirement of target setting. The invention also provides a mixed motor vehicle type cooling liquid filling strategy.

Inventors

  • HUANG HAOZHE
  • ZHANG ZHIWEN
  • WANG FUGUI
  • ZHANG GENYUN

Assignees

  • 奇瑞汽车股份有限公司

Dates

Publication Date
20260512
Application Date
20230629

Claims (8)

  1. 1. A mixed motor vehicle type cooling liquid filling strategy is characterized in that a mixed motor vehicle type thermal management system comprises a high-temperature cooling system, a low-temperature cooling system and a battery cooling system which are communicated through pipelines, wherein the high-temperature cooling system comprises an engine, a high-temperature radiator (1), a proportional three-way valve I (2), a proportional three-way valve II (3), a heater (4), a heat exchanger (5), a high-pressure heater (6), an electronic water pump I (7) and an expansion tank I (8), the low-temperature cooling system and the battery cooling system share the expansion tank II (9), the expansion tank I (8) and the expansion tank II (9) are arranged at a filling port of a vehicle cooling liquid to play a role of liquid storage and accumulation, and meanwhile, the low-temperature cooling system is used for balancing the operation pressure of the cooling system when the cooling system is operated, the low-temperature cooling system comprises a water cooling intercooler (10), an electronic water pump II (11), a vehicle electric driving system controller (12), an inverter (13) and a low-temperature radiator (14), the battery cooling system comprises a battery (15), a battery cooler (16), the heat exchanger (5), an electronic water pump III (17), an electronic water pump II (17), an electronic water pump (11) and an electronic water pump (26) which are used as an inverter (Ewp) for driving the electronic water pump (10) and an electronic water pump (3913), the B_ Ewp water pump is a battery cooling system water pump, the electronic water pump I (7) is an H_ Ewp water pump, and the H_ Ewp water pump is an electronic water pump with two functions of driving heating and battery heating; The coolant filling strategy execution step includes: Step 1, opening the box covers of an expansion box I (8) and an expansion box II (9), simultaneously screwing off a deflation cap on a pipeline, and statically filling cooling liquid; Step 2, waking up the vehicle, namely enabling the vehicle to be in a high-pressure preparation state, enabling the vehicle gear to be in a P gear, and simultaneously, long-pressing an Auto key and a rear defrosting key for 5s through an air conditioning interface AIPM of a vehicle-to-engine system, and waking up an air conditioning controller CLM and an engine control unit ECU; Step 3, an engine control unit ECU drives a P_ Ewp water pump to work; step 4, the air conditioner controller CLM drives the B_ Ewp water pump to work; step 5, aiming at a control strategy of the high-temperature cooling system, the ECU and the air conditioner controller CLM are required to cooperatively control; Step 6, after the timing of the step 2-5 is finished, the filling function is finished; and 7, repeating the steps to realize the function of filling and exhausting for multiple times, and finally, filling the liquid level of the expansion tank I (8) and the liquid level of the expansion tank II (9) are between a Max line and a Min line and are not changed.
  2. 2. A cooling liquid filling strategy for a hybrid vehicle according to claim 1, wherein the water-cooled intercooler (10), the electronic water pump II (11), the vehicle electric drive system controller (12), the inverter (13) and the low-temperature radiator (14) are communicated through pipelines.
  3. 3. A cooling liquid filling strategy for a hybrid vehicle according to claim 2, wherein the battery (15), the battery cooler (16), the heat exchanger (5) and the electronic water pump III (17) are communicated through pipelines.
  4. 4. A hybrid vehicle coolant filling strategy as in claim 3, wherein the expansion tank I (8) and the expansion tank II (9) are positioned at the highest point of the Z-direction position of the vehicle coolant system, and during filling, the tank covers of the expansion tank I (8) and the expansion tank II (9) are opened to fill the coolant, and the coolant flows to the bottom due to gravity.
  5. 5. The cooling liquid filling strategy of a hybrid vehicle according to claim 1, wherein the cooling liquid filling strategy in step 1 is characterized in that when the cooling liquid is statically filled, the liquid level of the cooling liquid is ensured to be between a Max line and a Min line, the cooling liquid is static and is not lowered within 10 minutes after being observed, and meanwhile, the air discharging cap is screwed on when the air discharging cap opening is observed to overflow from the cooling liquid.
  6. 6. A mixed motor type cooling liquid filling strategy as set forth in claim 1, wherein in the STEP 5, the ECU and the CLM are controlled cooperatively, the three-way valve II and the four actuators of the proportional three-way valve I, E _ Ewp water pump, the H_ Ewp water pump and the engine thermostat Thermostat are controlled sequentially, and timing management is performed by STEP1, wherein the flow direction of the proportional three-way valve II is set to be 1-2, the angle opening is 90 degrees, the water valve motor is driven to be a duty ratio.33 percent, the flow direction of the proportional three-way valve I is set to be 1-3, the angle opening is 240 degrees, the water valve motor is driven to be a duty ratio 88.88 percent, the rotating speed of the E_ Ewp water pump is set to be 1500rpm, the H_ Ewp water pump is set to be in a closed state, the engine thermostat Thermostat is in an open state, and timing is 120 seconds; STEP2, setting the flow direction of a proportional three-way valve II as 1-2, setting the angle opening as 90 degrees, setting the driving duty ratio of a water valve motor as 33.33 percent, setting the flow direction of the proportional three-way valve I as 1-2, setting the angle opening as 90 degrees, setting the driving duty ratio of the water valve motor as 33.33 percent, setting the rotating speed of an E_ Ewp water pump as 1500rpm, setting an H_ Ewp water pump as a closed state, setting an engine thermostat Thermostat as an opened state and timing for 120 seconds; STEP3, setting the flow direction of a proportional three-way valve II as 1-2, the angular opening as 90 degrees, the driving duty ratio of a water valve motor as 33.33 percent, setting the flow direction of a proportional three-way valve I as 1-2 &3, the angular opening as 180 degrees, the driving duty ratio of a water valve motor as 66.66 percent, setting the rotating speed of an E_ Ewp water pump as 3000rpm, setting an H_ Ewp water pump as a closed state, setting an engine thermostat Thermostat as an opened state and timing for 180 seconds; STEP4, setting the circulation direction of a proportional three-way valve II as 1-2 &3, the angle opening as 180 degrees, the driving duty ratio of a water valve motor as 66.66 percent, setting the circulation direction of the proportional three-way valve I as 1-2 &3, the angle opening as 180 degrees, the driving duty ratio of the water valve motor as 66.66 percent, setting the rotating speed of an E_ Ewp water pump as 3000rpm, setting an H_ Ewp water pump as a closed state, setting an engine thermostat Thermostat as an opened state and timing for 120 seconds; STEP5, setting the flow direction of a proportional three-way valve II as 3-2, the angle opening as 0 degree, the driving duty ratio of a water valve motor as 0 percent, setting the flow direction of a proportional three-way valve I as 1-2 &3, the angle opening as 180 degrees, the driving duty ratio of a water valve motor as 66.66 percent, setting an E_ Ewp water pump as a closed state, the duty ratio of an H_ Ewp water pump as 50 percent, and the engine thermostat Thermostat as an open state and timing for 60 seconds; STEP6, setting the flowing direction of a proportional three-way valve II as 3-2, setting the angle opening as 0 degree and the driving duty ratio of a water valve motor as 0 percent, setting the flowing direction as 1-3, setting the angle opening as 240 degrees and the driving duty ratio of the water valve motor as 88.88 percent, setting the rotating speed of an E_ Ewp water pump as 4000rpm, setting the duty ratio of an H_ Ewp water pump as 75 percent, setting an engine thermostat Thermostat as an on state and timing for 60 seconds; STEP7, setting the flow direction of a proportional three-way valve II as 3-2, the angle opening as 0 degree and the driving duty ratio of a water valve motor as 0 degree, setting the flow direction of a proportional three-way valve I as 1-2, the angle opening as 90 degrees and the driving duty ratio of a water valve motor as 33.33 percent, setting the rotating speed of an E_ Ewp water pump as 4000rpm, setting the duty ratio of an H_ Ewp water pump as 75 percent, setting an engine thermostat Thermostat in an opened state and timing for 60 seconds; STEP8, setting the circulation direction of a proportional three-way valve II as 1-2 &3, the angle opening as 180 degrees, the driving duty ratio of a water valve motor as 66.6 percent, setting the circulation direction of the proportional three-way valve I as 1-2 &3, the angle opening as 180 degrees, the driving duty ratio of the water valve motor as 66.6 percent, setting the rotating speed of an E_ Ewp water pump as 4000rpm, setting an H_ Ewp water pump as a closed state, setting an engine thermostat Thermostat as an opened state and timing for 180 seconds; STEP9, setting the circulation direction of the proportional three-way valve II as 1-2 &3, setting the angle opening as 180 degrees, setting the driving duty ratio of the water valve motor as 66.6 percent, setting the circulation direction of the proportional three-way valve I as 1-2 &3, setting the angle opening as 180 degrees, setting the driving duty ratio of the water valve motor as 66.6 percent, setting the E_ Ewp water pump and the H_ Ewp water pump as closed states, and setting the engine thermostat Thermostat as open states.
  7. 7. The cooling liquid filling strategy of the hybrid vehicle type of claim 1, wherein in the STEP 3, the engine control unit ECU drives the P_ Ewp water pump to work and starts timing, and the specific operation is that STEP1 is that the P_ Ewp water pump is started and the duty ratio is 40%, 120s is kept, STEP2 is that the duty ratio of the P_ Ewp water pump is 75%, and 180s is kept.
  8. 8. The cooling liquid filling strategy of the hybrid vehicle type of claim 1, wherein the air conditioner controller CLM in the STEP 4 drives the B_ Ewp water pump to work and starts timing, and the specific operation is that STEP1 is that the B_ Ewp water pump is started and the duty ratio is 40%, 120s is kept, STEP2 is that the duty ratio of the B_ Ewp water pump is 75%, and 180s is kept.

Description

Thermal management system and coolant filling strategy of hybrid vehicle type Technical Field The invention belongs to the technical field of automobile heat management, and particularly relates to a heat management system of a hybrid vehicle type and a cooling liquid filling strategy. Background There are two general use scenarios for coolant filling for passenger vehicles, namely filling during the manufacturing phase of the vehicle and after-market repair filling of the vehicle. In the after-sales maintenance process of the vehicle, the cooling liquid is filled manually from the inlet of the expansion tank of the vehicle cooling system. If special filling equipment is used for filling, the filling gun can extract air in the whole cooling system, and meanwhile the tightness of the system is detected, and then the cooling liquid is filled. In the after-sales maintenance process, the filling of the vehicle depends on the gravity of the cooling liquid and the exhaust structure of the cooling system to remove the air in the system, and after the vehicle is filled, the vehicle generally needs to stand for a period of time (some vehicles even need to start an engine, so that an engine water pump drives the cooling liquid to circulate), the change condition of the liquid level of the expansion tank is checked, and the secondary filling is considered. For traditional fuel vehicles, because the cooling system of the vehicle has a simpler structure, the resistance of the whole cooling system is smaller, and the manual filling can meet the requirement of after-sales maintenance under the normal condition. However, for hybrid electric vehicles, the number of cooling components is increased, the number of connecting pipelines is increased, the trend of system pipelines is complex because of the arrangement limitation of vehicle space, and the degassing structure of the system is difficult to remove all air in the cooling system completely. After the mixed vehicle is filled with the cooling liquid manually, the condition that the liquid level of the cooling system is reduced after the vehicle stands for a long time (the air in the system is slowly discharged) easily occurs, so that the actual filling amount of the system is smaller than the target filling amount, in this case, if the vehicle has a severe driving situation, faults such as over-temperature of a power system and the like easily occur, and even the vehicle is thrown safely in severe cases. The application patent of China with the application number of CN202111451293 published in 2022-05-13 provides auxiliary equipment for filling cooling liquid into a new energy automobile, relates to the field of new energy automobiles, can improve the filling speed of cooling liquid in a low-temperature loop, has low cost and small size, and is suitable for filling non-factory sites. The novel energy automobile cooling liquid filling auxiliary equipment comprises a shell, a piston and a driving device, wherein a cavity is formed in the shell, a filling opening and a pressure relief opening are formed in the shell, the filling opening is used for communicating the cavity with a degassing chamber of an automobile cooling system, the pressure relief opening is used for communicating the cavity with the outside, the piston is arranged in the cavity and is in sliding sealing connection with the inner wall of the cavity, the driving device is used for driving the piston to slide between a first position and a second position along the inner wall of the cavity, the filling opening is located outside the first position and the second position, and the pressure relief opening is located between the first position and the second position. However, the technical solution of the patent still cannot solve the technical problem of the present application. Disclosure of Invention Aiming at the defects existing in the prior art, the invention aims to provide a thermal management system and a cooling liquid filling strategy of a hybrid vehicle type, so that in the process of manually filling cooling liquid, the smooth loop of the cooling system can be ensured, the blockage of parts such as a water valve and the like is avoided, the filling quantity of the cooling liquid in the process of manually filling the cooling liquid can meet the requirement of target setting, and the problem that in the prior art, the actual filling quantity is smaller than the target filling quantity when the cooling liquid is manually filled into the hybrid vehicle is solved. In order to achieve the aim, the technical scheme is that the thermal management system of the hybrid vehicle comprises a high-temperature cooling system, a low-temperature cooling system and a battery cooling system which are communicated through pipelines, wherein the high-temperature cooling system comprises an engine, a high-temperature radiator, a proportional three-way valve I, a proportional three-way valve II, a heater, a heat excha