Method and instrument thereof for acoustic diagnosis of automobile engine

A technology of automobile engine and diagnosis method, which is applied in the direction of instrument, internal combustion engine test, measurement of ultrasonic/sonic wave/infrasonic wave, etc., and can solve the problems that have not been found and reported

Inactive Publication Date: 2010-07-21
罗新宇
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] After retrieval, no report similar to the present invention has been found

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  • Method and instrument thereof for acoustic diagnosis of automobile engine
  • Method and instrument thereof for acoustic diagnosis of automobile engine
  • Method and instrument thereof for acoustic diagnosis of automobile engine

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Embodiment Construction

[0043] Below in conjunction with accompanying drawing and embodiment describe in detail:

[0044] 1. Method

[0045] 1. In step 1., the digital sound sampling equipment is MP3, MP4, recording pen or multimedia computer etc. for use.

[0046] 2. In step ③, the quasi-periodic is that when several periodic signals are superimposed, if the least common multiple of their periods does not exist, the sum signal is no longer a periodic signal, but their frequency description also has the characteristics of a periodic signal , which is called a quasi-periodic signal.

[0047] 3. In step 5., the engine excitation quasi-period frequency of the theory is

[0048] f(ω)=ω / 2×n

[0049] In the formula, f is the theoretical engine excitation quasi-periodic frequency, ω is the engine speed, and n is the number of cylinders. f(ω) is the frequency characteristic of the sound produced by the engine when the engine speed is ω.

[0050] 2. Instrument

[0051] 1. Overall

[0052] Such as figu...

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Abstract

The invention discloses a method and an instrument thereof for an acoustic diagnosis of an automobile engine, which relate to a technique for diagnosing the automobile engine, namely a method and the instrument thereof for determining whether the working condition of the engine is normal or not by using acoustic features of the sound production of the engine. The instrument comprises a sound transducer (1), an analog-digital converter (2) and a data processor (3) which are connected with one another in turn from front to back. The method and the instrument thereof can discover whether the automobile engine works normally or not during driving under the condition of not influencing road automobile running for a traffic control department to realize a non-contact diagnosis and eliminate driveway hidden dangers of a vehicle with an abnormal engine in time; besides, the method and the instrument can also provide a practical diagnostic technique for other automotive vehicles.

Description

technical field [0001] The invention relates to automobile engine diagnosis technology, in particular to an automobile engine acoustic diagnosis method and its instrument; in particular, it relates to a method and its instrument for determining whether the engine is working normally by using the acoustic characteristics of engine sound. Background technique [0002] The car engine makes a sound when it is working, and experienced masters can judge whether its working state is normal [1]. But for ordinary people, it is difficult; in addition, for complex situations, even if you have experience, it is difficult to make accurate judgments. [0003] Many reasons can cause the car engine failure warning light to alarm, but there is no problem with the car itself, but it has to be checked in a repair shop, which is time-consuming and troublesome. Large-scale vehicles often have the phenomenon of cylinder depletion, that is, the phenomenon of fuel being discharged from the cylinde...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01M15/04G01H17/00
Inventor 罗新宇
Owner 罗新宇
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