Diagnosis and improvement method for low-frequency abnormal sound of air conditioning compressor under idling working condition of blade electric vehicle

Abstract

The invention discloses a diagnosis and improvement method for low-frequency abnormal sound of an air conditioning compressor under an idling working condition of a blade electric vehicle. The diagnosis and improvement method mainly comprises the following steps that abnormal sound sources are analyzed, and through simulating calculation and spectral analysis, a sound source part is determined preliminarily; then a final sound source part is determined by adopting an acoustic camera imaging technology; then sound source noise analysis is performed, specifically, noise time domain and frequencydomain analysis, sound filter analysis and sound quality analysis are involved; a rotor shaft vibration frequency response test is performed on air conditioning compressors of the blade electric vehicle and a competitive vehicle model, and a structure which generates the noise of the blade electric vehicle is determined; then, a rotor shaft starting control strategy of the air conditioning compressor of the blade electric vehicle is adjusted, and rotor shaft positioning starting is changed to rotor shaft non-positioning starting; and finally, improvement is performed in two aspects of the structure design and the manufacturing machining technology of the air conditioning compressor of the blade electric vehicle. According to the diagnosis and improvement method, the abnormal noise of theair conditioning compressor can be effectively detected and lowered.

Description

technical field [0001] The invention relates to the field of pure electric low-frequency noise control, in particular to a method for diagnosing and improving low-frequency abnormal noise of an air conditioner compressor under the idling condition of a pure electric vehicle. Background technique [0002] In recent years, with the development of social economy and the enhancement of human environmental awareness, and for the long-term consideration of future generations: the world is committed to reducing air pollution emissions, different from traditional vehicles that use internal combustion engines as energy, more and more large automobile groups The company has shifted its development goals to new energy vehicles such as hybrid electric vehicles, plug-in hybrid electric vehicles, pure electric vehicles, and hydrogen fuel cell vehicles. And more and more widely used. However, in addition to the noise and vibration problems existing in traditional cars, especially the uniq...

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Problems solved by technology

[0005] Although pure electric vehicles do not have the engine noise problem of traditional gasoline vehicles, they have their own unique electrical system noise problems, especially the noise problem of their air-conditioning compressors.

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