基于单片机控制的智能车测速算法研究

Research of smart car spead measurement algorithm based on single chip

针对智能车速度闭环控制需要较高的实时车速测量精度这一问题,对测速传感器及信号处理电路进行了设计,依据数字测速原理,对不同的数字测速算法进行了研究,得出M/T法测速在高、低速行驶范围内都有较好的理论测速精度,并以"飞思卡尔"S12单片机为硬件基础实现了M/T测速算法,采用信号发生器模拟速度传感器信号,通过实验证明了M/T测速算法的优越性,为智能车速度测量提供了理论依据及程序设计范例。

Aimed at the intelligent car adopts speed closed-loop control strategy,precise value of car speed is required,the thesis designs speed measurement sensors and signal processing circuits.By studying different digital speed measurement algorithms,high theoretical speed measurement precision can be obtained with M/T method in the wide range of driving speed according to digital speed measurement principle.At the same time,M/T speed measurement algorithm is achieved on the hardware basis of freescale S12 single chip.Speed sensor signal is simulated by Signal Generator（SG）,and the advantages of M/T speed measurement algorithm are proved with experiments.As the result,theoretical basis and program designing examples are provided for the speed measurement of intelligent car.