Engine Rotational Speed Measuring System Design Based on Single Chip Computer

Automobile engine rotational speed is an important parameter of engine running states, which can comprehensively reflect engine's working status and quality. In this study, frequency spectrum analysis method was adopted to measure the Automobile engine rotational speed. In this system C8051F340 single chip computer was used as control center, and connected with other relevant circuit elements. The signal analysis and processing of this system was realized by Fourier Fast Transform method. Testing results show that the system has good and stable performance, and high accuracy. Compared with traditional DSP chip, C851F340 single-chip computer has advantages of low energy consumption and low cost. It also can be used to measure sound frequency, voltage frequency and frequencies in other relevant industries.