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Method for testing engine vibration noise under whole-automobile condition

A testing method, vibration and noise technology, applied in the direction of measuring devices, measuring ultrasonic/sonic/infrasonic waves, instruments, etc., can solve the problems of time-consuming, laborious, large amount, and difficult data acquisition, and achieve the effect of saving production costs and being easy to obtain

Active Publication Date: 2014-03-26
CHONGQING CHANGAN AUTOMOBILE CO LTD
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AI Technical Summary

Problems solved by technology

[0004]1) The bench installation of the engine requires a lot of preparation work, which is time-consuming and labor-intensive (manpower and financial resources);
[0005]2) At present, the engines of most reference models use the anti-theft ECU, which cannot be directly tested on our bench, and the data acquisition is difficult

Method used

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  • Method for testing engine vibration noise under whole-automobile condition

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Embodiment Construction

[0033] Further illustrate this method below in conjunction with accompanying drawing:

[0034] 1 The test equipment to be used

[0035] (1) Vibration and noise test system and sensors.

[0036] (2) Sound intensity measurement system or acoustic holographic test system.

[0037] (3) The microphone used for the test shall comply with the requirements for Class 1 instruments specified in GB / T3785.

[0038] (4) The measuring device used for the test is to cover at least the frequency range from 20Hz to 10000Hz.

[0039] (5) Before and after the test, the test instrument should be calibrated according to the regulations, the two calibration values ​​should not exceed 1dB, and the accuracy of the calibrator should be better than or equal to ±0.5dB.

[0040] (6) The accuracy of the test instruments for vehicle speed and engine speed should be guaranteed to be less than 3%.

[0041] 2 Test conditions

[0042] 2.1 Site conditions: vehicle anechoic chamber

[0043] 2.2 Excep...

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Abstract

The invention provides a method for testing engine vibration noise under a whole-automobile condition. The method can utilize an easily obtained reference automobile resource to quickly accumulate the engine noise data of the reference automobile type so as to establish a noise database of the engine and the other engine of the reference automobile types, guide development and improvement of the novel engine, and guide improvement of the noise vibration level of the whole automobile product.

Description

technical field [0001] The invention belongs to the engine vibration and noise testing technology in automobile and engine engineering, and is used by departments of R&D and manufacturing of passenger cars, engine R&D, scientific research and testing. Background technique [0002] A large number of engine noise data of reference models is indispensable for the development of new engine products and improving the vibration and noise level of the whole vehicle, and it is not available for purchase, and must be accumulated by oneself. With the comparison data of the reference model, it is relatively simple to find the short board in the vibration and noise bucket, so as to solve the problem effectively and quickly. Therefore, it is very meaningful and necessary to study how to conduct engine noise testing in the vehicle state and quickly accumulate relevant empirical data. [0003] It should be said that the best environment for engine noise testing is the engine anechoic roo...

Claims

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Application Information

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IPC IPC(8): G01H17/00
Inventor 杨金才张亮徐永江丁艳平刘含洁
Owner CHONGQING CHANGAN AUTOMOBILE CO LTD
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