TORQUE CONTROL OF A VEHICLE POWERTRAIN BASED ON A TIME DERIVATIVE FOR A DYNAMIC TORQUE

摘要

A desired change of a time derivative of dynamic torque (Tqfw), provided to an output shaft from an engine in a vehicle, from a current value to a new desired value is determined. A current rotational speed difference (Δωpres) is determined between a first end of the powertrain in a vehicle, which rotates with a first rotational speed (ω1), and a second end of the powertrain, which rotates with a second rotational speed. The first rotational speed (ω1) is then controlled on the basis of the desired value of the time derivative for the dynamic torque (Tqfw), a spring constant (k) related to a torsional compliance in the powertrain, and the determined current rotational speed difference {Δωpres). Through control of the first rotational speed, the current value for the time derivative for the dynamic torque is also indirectly controlled towards the desired value.