Automobile air conditioner diagnosis method, system and equipment

Abstract

The embodiment of the invention discloses automobile air conditioner diagnosis method, system and equipment. The method comprises the steps of judging whether refrigerant concentration of an automobile air conditioner is normal or not; judging whether an environmental temperature is normal or not; judging whether a first node pressure value in an automobile air conditioner refrigerant loop is normal or not; judging whether a second node pressure value in the automobile air conditioner refrigerant loop is normal or not; judging whether an air outlet temperature of the automobile air conditioneris normal or not; judging whether refrigerant transmittance of the automobile air conditioner is normal or not; and diagnosing the automobile air conditioner according to a judgment result. The automobile diagnosis method provided by the embodiment of the invention is low in influence of artificial experience, rapid in diagnosis speed and high in accuracy, and the automobile diagnosis method is simpler and more convenient during process systematization application.

Description

technical field [0001] Embodiments of the present invention relate to the field of air conditioner fault diagnosis, in particular to a method, system and equipment for automobile air conditioner diagnosis. Background technique [0002] Automobile air-conditioning system, here specifically refers to the automobile indoor refrigeration system, which is composed of several major subsystems such as air-conditioning loop system, refrigeration medium, wind power transmission system, and electronic control system. The air-conditioning circuit is a closed pipeline system that provides a mixed medium flow of refrigerant (also called refrigerant) and refrigeration oil to generate heat exchange, generally including a compressor, a condenser, a drying tank, an expansion valve, and an evaporation box. Refrigeration medium refers to the flow medium that flows in the air-conditioning circuit to generate heat exchange. It is a mixture of refrigerant and refrigeration oil, in which the refri...

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Problems solved by technology

[0003] Automobile air conditioners have been used for a period of time, due to deterioration of refrigerant, refrigeration oil, mechanical wear or control failure of air conditioning components, failure of sensors or electronic control systems, failure of wind transmission system, etc., which may cause poor operation of the air conditioner

[0004] The existing air-conditioning fault diagnosis method usually uses a series of cumbersome tests on the car air-conditioning by the maintenance technicians of the auto repair shop based on personal knowledge and experience, and then makes a manual diagnosis based on their own experience and test results. It is difficult to guarantee standardization, professionalism and accuracy. Maintenance technicians with little experience or knowledge often need to spend a lot of time troubleshooting, and may not even get accurate diagnosis results

At present, there are also some technologies to judge the working status of automobile air conditioners by measuring the high and low pressure of the automobile air conditioning system and the temperature of the air outlet. However, due to the lack of system diagnosis, the judgment results deviate greatly from the actual situation.

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