Air conditioning unit and electronic expansion valve control method

Abstract

The invention discloses an air conditioning unit and an electronic expansion valve control method. The air conditioning unit comprises a refrigerant circulation loop, a compressor, a condenser, an electronic expansion valve, an evaporator and a controller. The electronic expansion valve control method is configured to obtain first operation parameters, second operation parameters, third operation parameters, evaporator pressure and compressor power in the operation of the air conditioning unit, wherein the first operation parameters are the air suction pressure and the air suction temperature of the compressor, the second operation parameters are the exhaust pressure and the exhaust temperature of the compressor, and the third operation parameters are the condenser pressure and the condenser liquid outlet temperature; and the target opening degree of the electronic expansion valve is determined based on the first operation parameters, the second operation parameters, the third operation parameters, the evaporator pressure and the compressor power; The opening degree of the electronic expansion valve is controlled through the target opening degree, so that the opening degree of the electronic expansion valve is accurately controlled, and lagging actions or frequent actions of the electronic expansion valve are reduced.

Description

technical field [0001] The present application relates to the field of air-conditioning control, and more specifically, relates to an air-conditioning unit and an electronic expansion valve control method. Background technique [0002] The expansion valve is a key component of the air-conditioning system. The adjustment speed and stability of the expansion valve are related to the stability of the air-conditioning system and the effect of cooling and heating, which indirectly affects the user's comfort. When the stability of the system is poor, there will be long-term fluctuations, which will affect the service life of the air conditioning unit. Therefore, the adjustment of the expansion valve is very important in the air conditioning system. Especially under low temperature conditions, the state change of the air conditioning system is relatively sensitive, and the expansion valve needs to be precisely controlled, so as to avoid fluctuations and quickly achieve equilibrium...

AI Technical Summary

Problems solved by technology

This solution needs to add a liquid level sensor, which increases the cost of the unit; the unit failure caused by the failure of the liquid level sensor is newly added, which increases the failure rate of the unit; there is a certain hysteresis and volatility in the liquid level measurement, which causes the action of the electronic expansion valve to lag. Therefore, there are periodic and frequent actions of the electronic expansion valve during control, which affects the life of the valve and the unit

[0004] Therefore, how to precisely control the opening of the electronic expansion valve and reduce the action lag and frequent action of the electronic expansion valve is a technical problem to be solved at present.

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