Automobile engine speed measurement apparatus and method

A technology for measuring automobile engine and rotational speed, which is applied in the direction of devices using electric/magnetic methods to achieve the effect of large dynamic range and measurement accuracy

Inactive Publication Date: 2005-12-07
曹广忠
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The technical problem to be solved by the present invention is a device and method for quickly obtaining the engine speed of an automobile while measuring the exhaust noise of the automobile

Method used

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  • Automobile engine speed measurement apparatus and method
  • Automobile engine speed measurement apparatus and method
  • Automobile engine speed measurement apparatus and method

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0030] Embodiment one: if figure 2 , 3 As shown, the microphone assembly 1 includes a microphone S0 and a preamplifier U0, and the preamplifier U0 is connected to the output end of the microphone S0 and the input end of the analog processing circuit 2; the microphone S0 is the input of the automobile exhaust noise signal into the device of the present invention In part, S0 can use a test condenser microphone, such as model AWA14421, sensitivity 50mv / Pa, dynamic range 20-142dB; U0 can use a condenser microphone preamplifier, such as model AWA14602, test range 25-130dB, transmission gain 0dB.

[0031] The conversion circuit 3 includes an analog-to-digital conversion circuit U16 and a digital signal processor U17 connected in sequence, the input of the analog-to-digital conversion circuit U16 is connected to the output of the analog processing circuit 2; the flash memory connected to the digital signal processing U17 The device U20 is a device for extracting the rotational spee...

Embodiment 2

[0052] Embodiment 2: The overall concept of this embodiment is the same as that of Embodiment 1, but its analog processing circuit 2 adopts an analog automatic gain control circuit AGC, without a microprocessor. The conversion circuit 3 also uses an analog spectrum analyzer, Fourier converter, etc. to cooperate with a frequency-voltage converter (F-V converter). After obtaining the fundamental frequency f value, it does not need to use a formula to calculate, but uses a calibrated pointer The type measuring instrument displays the rotational speed and noise value. The same advantages and performance indicators as in Embodiment 1 can be obtained.

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Abstract

This invention discloses a car engine rotational velocity test device and a method including an analog process circuit and a converting circuit connected with the output of a microphone assembly and the input of a display circuit orderly, among which, the noise signal at the air vent is received by the microphone assembly and processed to become an engine rotational velocity signal or a value or a noise signal quantity value by the analog process circuit and the converting circuit. The analog process circuit includes a multiple selector for automatically controlling amplified output level to ensure a large dynamic sphere test and its accuracy.

Description

technical field [0001] The invention relates to a device and method for measuring the rotational speed of an automobile engine, in particular to a device and a method for measuring the rotational speed of an automobile engine by using characteristics of aerodynamic noise. Background technique [0002] At present, after the assembly of the car is completed, the value of the engine speed of the car is generally indicated by the tachometer inside the car. Motor vehicle quality inspection departments and vehicle researchers cannot effectively understand the engine noise at different speeds, nor can they study the working conditions of the engine through the noise at different speeds. The traditional noise detection method uses a sound level meter to measure the value of the noise, but cannot simultaneously obtain the speed value of the automobile engine. [0003] In the Chinese patent published on May 6, 1992, the application number is 91215837.9, and the name is "vibration tac...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01P3/44
Inventor 曹广忠
Owner 曹广忠
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