Filtering and measuring of the rotating speed signal in the truck AMT system

In order to improve the metrical precision of the rotating speed in the truck automated mechanical transmission (AMT) system and then enhance the power and economic performances of the truck equipped with AMT system, an analogous finite impulse response (FIR) filtering algorithm and a self-tuned dynamic multiple cycles measuring algorithm based on the cycle measurement method are proposed. The algorithms can solve the problem that the rotating speed signal is apt to be disturbed and the variational scope of the speed is wide. Based on the two algorithms, an experimental system adopting complex programmable logic device (CPLD) is established. Experimental results show that the metrical precision of the speed is highly improved in the whole scope of the rotating speed and the interference issue is solved. Furthermore, the execution of the speed measurement task and the real-time control task can be harmonized effectively adopting the algorithms.