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Turbocharger abnormal sound diagnosis method

A technology of turbocharger and diagnostic method, which is applied in the field of automobile noise and vibration, can solve the problems of metal knocking abnormal sound without diagnostic analysis method, etc., and achieve the effect of shortening the development cycle, short test cycle and fewer measurement points

Active Publication Date: 2020-07-03
XIANGYANG DAAN AUTOMOBILE TEST CENT
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Problems solved by technology

[0003] At present, common noises such as turbocharger exhaust sound, sub-synchronous noise, and synchronous noise have been analyzed and sorted out, but there is no diagnostic analysis method for the abnormal metal knocking noise studied in the present invention. It is of great significance to improve the noise of the compressor

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Embodiment Construction

[0030] Now, the technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with the accompanying drawings, and the described embodiments are only part of the embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by persons of ordinary skill in the art without making creative efforts belong to the protection scope of the present invention.

[0031] figure 1 , 2 Among them, the abnormal sound diagnosis device includes a tachometer for measuring engine speed, a speed probe for measuring turbocharger rotor speed, a triaxial accelerometer for measuring vibration of a turbocharger wastegate valve actuator, Microphones for measuring interior noise and turbocharger near-field noise, acquisition systems for classifying and integrating various signals, noise and vibration analysis systems for data processing and analysis, and filter playback systems for filteri...

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Abstract

The invention relates to a turbocharger abnormal sound diagnosis method. The method comprises steps of 1) noise vibration analysis; 2) filtering playback, the engine crankshaft rotating speed and theturbocharger rotor rotating speed corresponding to the frequency when abnormal sound occurs in the noise in a vehicle and the turbocharger near-field noise are filtered and separated; 3) excitation source control, the opening and closing time proportion of a turbocharger waste gas bypass valve is controlled by adjusting the duty ratio; 4) subjective evaluation, subjective evaluation is performed on in-vehicle abnormal sounds and turbocharger near-field noise in three states of an original vehicle state, adjustment of the duty ratio of a waste gas bypass valve controller to be zero and fixationof a waste gas bypass valve; 5) confirmation of the source of abnormal noise; and 6) conclusion verification, a pressure stabilizer is arranged at an air outlet of an air compressor of the turbocharger, and the conclusion is verified through objective improvement of abnormal sound quantification. The method is advantaged in that the abnormal sound source is quickly found by controlling possible excitation source state change, and the test period is short.

Description

technical field [0001] The invention belongs to the technical field of automobile noise and vibration, and in particular relates to a method for diagnosing abnormal noise of a turbocharger. Background technique [0002] Small and lightweight supercharged engines are an important direction for the future development of the automotive industry. Among the main noise sources of supercharged engines, in addition to the mechanical noise and combustion noise of the engine, the noise problem caused by the turbocharger is becoming more and more prominent. comfort. Therefore, the problem of turbocharger noise has become an important research topic for automobile companies, and it is necessary to study the diagnostic method of turbocharger abnormal noise. [0003] At present, common noises such as turbocharger exhaust sound, sub-synchronous noise, and synchronous noise have been analyzed and sorted out, but there is no diagnostic analysis method for the abnormal metal knocking noise ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01M13/00
CPCG01M13/00
Inventor 邱永进严辉任冬
Owner XIANGYANG DAAN AUTOMOBILE TEST CENT
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