Performance of integrated engine-CVT control considering powertrain loss and CVT response lag

Abstract

In this paper, an integrated engine-continuously variable transmission (CVT) control algorithm is suggested by considering the powertrain loss and the inertia torque due to the CVT ratio change. In addition, compensation algorithms to reduce the effect of the CVT ratio response lag on the drive torque are presented. Experimental results show that the optimal engine speed compensation algorithm gives better engine operation around the optimal operation line compared with the optimal torque compensation while showing nearly the same acceleration response. The performance of the proposed integrated engine-CVT control algorithms is compared with that of conventional CVT control, and it is found that better engine operation on the optimal operation line can be achieved by using integrated control during acceleration.