Apparatus for damping mechanical resonance in a vehicle powered by an engine

摘要

Shunt results from drive line resonance of a vehicle's transmission super-imposing cyclic oscillations onto the speed of the vehicle's engine (1). A feedback loop comprising at least one of a band pass filter (22) having a high frequency cut-off characteristic greater than first order, a feed back loop in which the loop gain is a function of transmission ratio, and a non-linear transfer element (25) arranged to have a gain whose magnitude increases with the magnitude of the input to the non-linear transfer element. Additionally shunt may also be controlled by a feed-forward controller (41-43) based on an engine demand signal.