Damping oscillations in two mass flywheel drive system.

摘要

The output drive train (10) of an internal combustion engine (56) has a two-mass flywheel (12,13), the difference between the angular velocities of the primary and secondary masses being fed via a negative feedback connecting (68,52) to control the fuel supply to the engine, thereby to damp unwanted oscillations in the flywheel. The crankshaft torque is calculated in a simulator (61) of a Luenberger observer circuit (51) to produce a calculated primary mass angular velocity signal which is compared (66) with a calculated secondary mass angular velocity signal. The observer circuit is adjusted by comparing (60) calculated and actual primary mass angular velocity signals. If desired both angular velocities may be measured, in which case the observer circuit (51) is replaced by a comparator.