Control of the Transmission Ratio Derivative in Passenger Car Powertrain with CVT

The continuously variable transmission (CVT) differs from the traditional automatic transmission (AT) in that it introduces an additional degree of freedom - the transmission ratio derivative (TRD) - into the control system. Based on the derived equation expressing dynamics of a car with CVT, the author analysed the influence of the TRD on the drive properties. The theoretical results were verified with the use of the Road Load Simulator (RLS).