Dynamic analysis and simulation of driveability and control of a double transition shifting system

"Double Transition Shift" refers to the shift process in a special structured automatic transmission which employs more than one pair of clutches and brakes to perform a gear shift. Since more elements are involved during the shift process, the double transition shift algorithm is much more complicated than the traditional gearbox. Therefore, the development of the control strategy to accomplish the optimal driveability becomes a challenge for automotive control engineers. In this paper, a patented double transition transmission is studied for shifting process using a dynamic analysis and driveability control algorithm simulation. A dynamic model is developed based on multi-body dynamics theory in which all elements interactions with varies motion states and forces are considered. A simulation model of the whole vehicle and the transmission is established. Based on the parametric study, the control strategy is proposed and a well behaved driveability during the double transition shift process is achieved.