Control method of vehicle-mounted heat pump air-conditioning set

Abstract

The invention discloses a control method of a vehicle-mounted heat pump air-conditioning set. On the basis of a major loop of the vehicle-mounted heat pump air-conditioning set, an air supplementing loop is added; the major loop is internally provided with a main road electronic expansion valve (5), a compressor (1), a gas-liquid separator (12), a condenser (4), and an evaporator (11); the major loop and the air supplementing loop transfer heat through an economizer; the air supplementing loop is provided with an air supplementing electronic expansion valve and a one-way valve; and gas outputfrom the air supplementing loop enters a middle compression valve of the compressor. The control method of the vehicle-mounted heat pump air-conditioning set is especially suitable for operating in low temperature environment, and the reliability is high.

Description

technical field [0001] The invention relates to a control method of a vehicle-mounted heat pump air conditioner unit. Background technique [0002] At present, there are two difficult technical problems in the heating of domestic vehicle-mounted heat pump air conditioners. One is that when operating at low ambient temperature, the suction specific volume of the compressor increases and the pressure ratio is large, which causes a significant drop in the heating energy efficiency ratio. The heating capacity attenuation is severe; the second is that when the ambient temperature is lower than -15°C, due to the high pressure ratio of the compressor, the discharge temperature of the compressor is too high, which may easily cause the carbonization of the lubricating oil to fail, and the compressor will not be effectively lubricated and damaged , it is difficult for the heat pump to operate reliably and stably for a long time. Therefore, it is necessary to design a control method f...

AI Technical Summary

Problems solved by technology

[0002] At present, there are two difficult technical problems in the heating of domestic vehicle-mounted heat pump air conditioners. One is that when operating at low ambient temperature, the suction specific volume of the compressor increases and the pressure ratio is large, which causes a significant drop in the heating energy efficiency ratio. The heating capacity attenuation is severe; the second is that when the ambient temperature is lower than -15°C, due to the high pressure ratio of the compressor, the discharge temperature of the compressor is too high, which may easily cause the carbonization of the lubricating oil to fail, and the compressor will not be effectively lubricated and damaged , it is difficult for the heat pump to operate reliably and stably for a long time

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