Apparatus for detecting engine speed by exhaust pressure

Abstract

The invention discloses a device which detects the rotating speed of an engine by exhaust pressure, comprising an engine tail gas pressure collecting device, a pressure sensor, a signal processor, a central processor and a displayer; wherein, the pressure sensor collects the pressure signal of the tail gas in the engine tail gas pressure collecting device and converts the pressure signal into an electric signal which is transmitted to the signal processor so as to be converted into a digital pulse signal which is transmitted to the central processor, and the central processor calculates and displays the rotating speed value by the displayer according to the pulse signal; the device collects the frequency signal of engine exhaust pressure by utilizing the proportion relationship of engine exhaust frequency and rotating speed and the correspondence relationship of transient increasing and reducing of exhaust pressure and the frequency, thus obtaining a rotating speed signal, avoiding influence of external factor on the detection result, guaranteeing the accuracy of the detection result, being simple and convenient for use during detection, and being capable of directly testing the rotating speed of the vehicle engine on any random occasion; and the device has small volume and convenient carrying.

Description

technical field [0001] The invention relates to a device for detecting engine performance, in particular to a device for detecting engine speed through exhaust pressure. Background technique [0002] The engine speed is an important performance index of the engine. During the production and maintenance process, the engine speed needs to be tested. [0003] In the prior art, the engine speed test instrument is mainly composed of a sensor and a corresponding circuit. The sensor directly senses the movement of the moving parts of the engine, and the speed signal is output after being processed by the processing circuit. The existing engine speed measuring instruments can basically achieve accurate measurement. [0004] However, the existing measuring instruments must contact or sense the moving parts of the engine, all of which are based on mechanical principles, the use process is relatively complicated, and it is difficult to carry and install the instrument. Moreover, the ...

AI Technical Summary

Problems solved by technology

[0004] However, the existing measuring instruments must contact or sense the moving parts of the engine, all of which are based on mechanical principles, the use process is relatively complicated, and it is difficult to carry and install the instrument

Moreover, the existing measuring instruments must contact or sense the rotating parts of the engine, and are installed and fixed in the car body near the engine, especially in the car body after assembly, it is extremely inconvenient to disassemble, maintain and install

In order to solve the above problems, a method and device for detecting the speed of the engine through the noise of the engine have appeared. Although the use of this device is relatively simple, the engine speed can also be measured according to the noise in theory, but it is easy to be interfered by external factors, such as , other sound signals are more likely to affect the detection results, causing large deviations in the detection results

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