Ratio Control Strategy for an Electromechanical Continuously Variable Transmission Based on Engine Models
Electromechanical control CVT (EM-CVT) is a new type of continuously variable transmission, and its ratio quality is an important parameter validated the performance of vehicle. In order to study the dynamical coupling technology between EM-CVT and engine under the running state of vehicle, the special character of two working models is obtained by engine experiment; according to the principle of the EM-CVT, the relation between vehicle speed and ration is theoretically analyzed. Based on the basic theory of PID control, the improved PID control algorithm is proposed for the speed ratio control of the EM-CVT, and experimental verification is made. The experimental results show that there is a significant effect on the system with this algorithm.
Yungang Li, Pengcheng Wang, Liqun Ai, Xiaoming Sang and Jinglong Bu
Q. Jiang et al., "Ratio Control Strategy for an Electromechanical Continuously Variable Transmission Based on Engine Models", Advanced Materials Research, Vols. 291-294, pp. 2861-2865, 2011