A CO2-enhanced thermal management system for a vehicle and a control method thereof

By designing a vehicle CO2 energy-enhancing thermal management system, using two-stage compression intermediate gas replenishment technology and multi-mode control method, the problem of poor cross-critical CO2 refrigeration performance is solved, and the summer endurance and dehumidification and fog removal function of electric vehicles are improved.

CN115284825BActive Publication Date: 2025-04-01XI AN JIAOTONG UNIV
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Patent Information

Application Number
CN202211058217.9
Authority / Receiving Office
CN · China
Patent Type
Patents(China)
Current Assignee / Owner
Filing Date
2022-08-31
Publication Date
2025-04-01
Estimated Expiration
2042-08-31

AI Technical Summary

Technical Problem

The lack of a complete cross-critical CO2 automotive thermal management system solution and its control method in the prior art, resulting in poor refrigeration performance of cross-critical CO2 cycles, which has an adverse impact on the summer endurance of electric vehicles.

Method used

A vehicle-based CO2 energy-enhancing thermal management system is designed, adopting a technical solution for two-stage compression intermediate gas replenishment, and through the combination of solenoid valves and electronic expansion valves, the control of different modes such as high-temperature refrigeration, low-temperature heating, and dehumidification and defogging are achieved.

Benefits of technology

It improves the refrigeration performance of the transcritical CO2 system, enhances the summer endurance of electric vehicles, and has the function of dehumidification and defogging, meeting the multi-target temperature control needs of electric vehicles.

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Abstract

The present invention discloses a vehicle CO2 energy-enhanced thermal management system and a control method thereof. The present invention discloses the control scheme of the thermal management system in three modes: high-temperature refrigeration, low-temperature heating, and dehumidification and defogging. The system uses four solenoid valves to change the overall flow direction of the refrigerant, and uses a full-pass throttle valve and a solenoid valve to change the series-parallel relationship between the first indoor heat exchanger and the second indoor heat exchanger. In a high-temperature environment, the system adopts a two-stage compression intermediate air supply method to improve the refrigeration performance of the transcritical CO2 system, which is conducive to solving the short board problem of the summer endurance of the transcritical CO2 thermal management system. In a high-temperature environment, the system turns off the compressor intermediate air supply, and all refrigerants are subjected to two-stage compression and then countercurrent heat exchange with the cabin air supply, making full use of the low-temperature heating capacity of the transcritical CO2 system. At the same time, a full-pass throttle valve is used to enable the system to have the ability of dehumidification and defogging, which is used for windshield defogging.
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