Transcritical carbon dioxide electric vehicle thermal management system and control method thereof

Abstract

The invention discloses a transcritical carbon dioxide electric vehicle thermal management system and a control method. The transcritical carbon dioxide electric vehicle thermal management system comprises a compressor, a gas cooler, a first electronic expansion valve, a liquid storage device, a second electronic expansion valve and an evaporator. The compressor is a 3 + 1 cylinder air supplementing piston type compressor, an air suction port a of the compressor is connected with three main air cylinders for main circulation compression, an air suction port b of the compressor is connected with one auxiliary air cylinder for air supplementing compression, two paths of refrigerants are mixed after compression is completed, and the compression frequencies of the two paths of refrigerants areconsistent; an outlet of the compressor is connected with the liquid accumulator through the gas cooler and the first electronic expansion valve; a gas outlet of the liquid accumulator is connected with a gas suction port b of the compressor; and a liquid outlet of the liquid storage device is connected with an air suction port a of the compressor through the second electronic expansion valve andthe evaporator. The problem that the transcritical carbon dioxide refrigeration performance is insufficient is solved, the progress that the green refrigerant CO2 is put into practical application ispromoted, and great contribution is made to environmental protection and energy conservation.

Description

technical field [0001] The invention belongs to the technical field of transcritical carbon dioxide systems, in particular to a thermal management system for a transcritical carbon dioxide electric vehicle and a control method thereof. Background technique [0002] Due to poor environmental performance, traditional refrigerants are gradually facing the trend of being eliminated. while CO 2 As a natural refrigerant, it has obvious advantages. First, CO 2 It is non-toxic and non-flammable. It has very little mass when used as a heat pump system or an air-conditioning system. Even after a leak occurs, the concentration is very low and will not cause fatal harm to the human body. Secondly, CO 2 It is pure natural gas, will not cause damage to the environment and the atmosphere, is green and environmentally friendly, and meets the requirements of sustainable development. Not only that, CO 2 It is rich in content in the natural environment, low in price and good in economy. ...

AI Technical Summary

Problems solved by technology

[0003] However, according to the existing research on transcritical CO 2 Cycle studies found that transcritical CO 2 When the cycle is used as an air conditioner, the cooling performance at high ambient temperature (above 35°C) is not ideal. Meet the comfort requirements of the human body

This shortcoming seriously hinders the transcritical CO 2 The comprehensive promotion and application of green refrigerants has hindered the progress of the development of green refrigerants

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