Control method and system for vehicle air conditioner, and vehicle

Abstract

The invention provides a control method and system for a vehicle air conditioner, and a vehicle, and belongs to the field of vehicles. The control method comprises the following steps that the pressure value of a refrigerant is collected; the pressure value at the current time and the pressure value at the last time are compared; when the pressure value is increased, the pressure value at the current time is compared with a first high-pressure protective value and a first low-pressure protective value, if the pressure value at the current time is larger than the first low-pressure protective value and less than the first high-pressure protective value, a fan of the air conditioner outputs the corresponding rotational speed according to the current pressure value, or otherwise a compressoris cut off; and when the pressure value is decreased, the pressure value at the current time is compared with a second high-pressure protective value and a second low-pressure protective value, if thepressure value at the current time is larger than the second low-pressure protective value and less than the second high-pressure protective value, the fan outputs the corresponding rotational speedaccording to the current pressure value, or otherwise the compressor is cut off. The invention further provides the corresponding control system and the vehicle with the same. According to the controlmethod, the control system and the vehicle, the situation of refrigerant leakage can be effectively reduced.

Description

technical field [0001] The invention relates to the field of vehicles, in particular to a control method, a control system and a vehicle air conditioner. Background technique [0002] During the use of the vehicle air conditioner, when there are abnormal conditions such as blockage of the heat sink, cooling fan not turning, or excessive refrigerant, the pressure of the refrigeration system is too high and the system components are easily damaged. When the refrigerant in the refrigeration system is insufficient or leaks, the refrigerating lubricating oil may also leak, resulting in poor lubrication of the air conditioning system. If the compressor runs in a state of oil shortage, it will cause serious damage. [0003] In order to protect the components of the refrigeration system, a pressure switch protection circuit is usually set in the air-conditioning refrigeration cycle pipeline to control the working state of the air conditioner by closing or disconnecting the pressure ...

AI Technical Summary

Problems solved by technology

[0004] However, due to the existence of high-voltage protection and low-voltage protection in the refrigeration system, some air conditioners will also set medium-voltage protection, that is, to turn on the air-conditioning fan. The method, the number of pressure switches and the number of interfaces increase the possibility of refrigerant leakage

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