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.
In developing a tiny crawler-type cultivator, the chassis speed needs to be accurately obtained in order to meet the requirements of precision agriculture for straight walking. This paper focuses on solving the problem of chassis speed measurement. Firstly, the principle of speed measuring device and the special M/T method is introduced. Then we use STM32F407ZGT6 as the hardware development environment and give the program flow chart to achieve the special M/T method. Finally, according to the demand of this project, the experimental results are obtained by taking different data, which prove the reliability of the special M/T method.
In developing a tiny crawler-type cultivator, the chassis speed needs to be accurately obtained in order to meet the requirements of precision agriculture for straight walking. This paper focuses on solving the problem of chassis speed measurement. Firstly, the principle of speed measuring device and the special M/T method is introduced. Then we use STM32F407ZGT6 as the hardware development environment and give the program flow chart to achieve the special M/T method. Finally, according to the demand of this project, the experimental results are obtained by taking different data, which prove the reliability of the special M/T method.