Electric vehicle jet heat pump air conditioning system and control method thereof

Abstract

The invention provides an electric vehicle jet heat pump air conditioning system and a control method thereof. The heat pump air conditioning system has the advantages of low energy consumption and high efficiency. On the premise of ensuring the comfort of passengers, the cruising mileage of an electric vehicle is increased under the condition of low temperature in winter. The electric vehicle jet heat pump air conditioning system comprises an electric secondary compressor, a four-way valve, an out-vehicle heat exchanger, an electronic valve, a reservoir, an ejector, an in-vehicle heat exchanger and a gas-liquid separator; the high-pressure port of the electric secondary compressor is connected with the main fluid inlet of the ejector after passing through the four-way valve, the in-vehicle heat exchanger, the electronic valve and the reservoir in sequence; the medium-pressure port of the electric secondary compressor is connected with jet fluid outlet of the ejector; the low-pressure port of the electric secondary compressor is connected through the gas-liquid separator, the four-way valve and the out-vehicle heat exchanger in sequence (the ejector is not passed under a low pressure, and is deleted). Compared with the conventional automobile air conditioner, the electric vehicle jet heat pump air conditioning system has the advantages of high efficiency of a heat pump system and very high practicability.

Description

technical field [0001] The invention belongs to an electric vehicle air conditioning system, in particular to an electric vehicle jet heat pump air conditioning system and a control method thereof. Background technique [0002] The traditional vehicle air-conditioning system is a single-refrigeration air-conditioning system. The heating in winter comes from the circulating hot water of the engine, while electric vehicles use batteries as driving power, which makes their air-conditioning systems different from those of fuel vehicles. At present, the electric air-conditioning system of electric vehicles generally adopts an electric heat pump air-conditioning system, which is also a single-refrigeration air-conditioning system. The heat pump fails to work at low temperatures (below -5°C), so the heating source uses PTC for heating, and the power consumption of PTC is very high. At the same time, it is difficult to further improve the heating energy efficiency ratio of traditi...

AI Technical Summary

Problems solved by technology

At present, the electric air-conditioning system of electric vehicles generally adopts an electric heat pump air-conditioning system, which is also a single-refrigeration air-conditioning system. The heat pump fails to work at low temperatures (below -5°C), so the heating source uses PTC for heating, and the power consumption of PTC is very high. At the same time, the heating energy efficiency ratio of traditional heat pump air conditioners is difficult to further improve, which is not conducive to improving the driving range of electric vehicles

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