Method for controlling the torque of a powertrain

摘要

A method is presented for controlling torque of a powertrain (11,15) by minimising the error between the actual powertrain torque (as read by the torque sensor(121)) and the desired powertrain torque (as requested by the vehicle driver). Since torque sensors are known to drift under certain conditions, such as high ambient temperature, the output of the torque sensor is adjusted by an offset value. This offset value is determined by reading the torque sensor output when the speed ratio (engine speed/turbine speed) is substantially unity, and the net torque at the torque converter is substantially zero. This adjusted output is then filtered to avoid abrupt fluctuations in the powertrain torque, and used to improve powertrain control so that better drive feel and increased fuel economy can be achieved.