This method uses the two of timer/counter on MCU reasonably,one is time indices and another is the counter of the engine plus,leads this system hardware to be simple and reliable.

• 该方法合理地利用常用单片机系统的两个定时/计数器作为测量时标信号及发动机转数计数,使得系统的硬件电路简单、可靠。