【摘要】 在对车辆发动机转速的测量过程中,存在着测量时间与测量精度的矛盾。文中提出了一种动态调整测量次数的频率测量法,合理地解决了这个矛盾,使得测量系统能在满足实时性的要求的同时,尽可能获得高精度的发动机转速测量。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。同时还提供了对该设计的实现方法。更多还原

【Abstract】 There is a contradiction between the detect time and precision in tachometry of vehicle motor. In this paper,a frequency measurement base on self-adjusting detect times was proposed,has resolved this contradiction reasonably,and leads to get the higher precision while the measurement is real-time. 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. Simultaneously has also provided to this design realization method.更多还原