Rapid measurement device of speed of automobile engine

Abstract

The invention relates to a rapid measurement device of speed of an automobile engine. The rapid measurement device mainly consists of a shock wave signal acquisition assembly (A) and a signal simulation processing assembly (B). The rapid measurement device is characterized in that the shock wave signal acquisition assembly (A) comprises an impact force sensor (1) and a rapid chucking device (2), wherein, the rapid chucking device (2) comprises a jaw opening, a return torsion spring (3), elastic arms (4), a locking device (5) and an elastic handle (6), the impact force sensor (1) is arranged atone end of a long bar which is fixed on the jaw opening, the return torsion spring (3) is arranged on jaw opening arms, the elastic handles (6) are respectively arranged at one end of the jaw openingarms, one of the jaw opening arms is the elastic arm (4), and the locking device (5) is arranged between the two elastic arms (4). The rapid chucking device (2) can help rapidly and stably mount theimpact force sensor in an automobile exhaust tube and can help rapidly disassemble the impact force sensor after measurement.

Description

technical field [0001] The invention belongs to a fast measuring device for the rotational speed of an automobile engine, which collects the exhaust gas shock wave generated by the exhaust valve switch in the exhaust pipe of the automobile, and then amplifies the collected signal through a signal simulation processing component and converts it into an engine rotational speed value. Based on the high sensitivity of the impact sensor and the design of the signal processing circuit, the measurement device has the characteristics of high measurement accuracy and good system reliability, and the quick clamping device is easy to operate, and can quickly and accurately measure the engine speed. Background technique [0002] The speed of the car engine is given based on the car tachometer that measures the mechanical quantity. The existing non-contact measurement methods on the car inspection line mainly include: using the pressure change in the high-voltage coil to measure the engin...

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Problems solved by technology

[0002] The speed of the car engine is given based on the car tachometer that measures the mechanical quantity. The existing non-contact measurement methods on the car inspection line mainly include: using the pressure change in the high-voltage coil to measure the engine speed value. This measurement method needs to start the car. The front end cover, and then install the sensor, the operation is cumbersome, and it cannot meet the rapid detection requirements on the detection line; the noise signal in the exhaust pipe of the automobile is used to simulate and process the speed value of the automobile engine, this measurement method is greatly affected by external noise, and the measurement accuracy is low. And the cost of measuring equipment is high

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