Abstract
Rotating speed is an important parameter to reflect the running condition of the engine, and its real-time measurement and accuracy are directly related to the control accuracy of the engine. In this paper, according to the actual demand for the measurement of engine speed, a system architecture and a hardware design scheme of frequency acquisition circuits are proposed. The overall simulation is carried out by Saber. According to technical requirements, the transfer function of the band-pass filter network and the hysteresis threshold are analyzed and calculated theoretically. By adjusting the RC value of the low-pass filter and introducing the reference voltage to reduce the hysteresis threshold, the acquisition failure caused by the low output excitation when the engine is running at low speed is solved. The high-precision acquisition in the full speed range is realized, with ideal simulation.
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