关键词: 硬件角产生器, N2HET, 齿轮转速, 角度测量

Abstract: In order to improve the resolution of the engine control system for gear speed and angle measurement, a high-resolution gear angle and speed measurement system based on the hardware angle generator (HWAG) module of the RM57L843 processor is introduced. HWAG module has programmable hardware filter, which is used to reduce the interference of input noise and reduce the demand for filtering function of system hardware circuit. The HWAG module uses the time-interpolation algorithm to generate K angle ticks based on the previous pulse cycle, and the angle counter accumulates each angle ticks. The HWAG is connected to a high-end timer N2HET and provides it with gear angle information. The N2HET module processes angle and time signals at the same time to obtain speed value. Compared with the traditional method, the resolution of angle measurement is improved by K times.

Key words: hardware angle generator, N2HET, gear speed, speed measurement