Patent ID: 6286473
Filing Date: 2001-09-11
Classification: F02B,F02N

Abstract:
A system for use in combination with a vehicle including an engine which drives a crankshaft at a first speed, said system being effective to damp oscillations of said first speed and comprising:an electric machine which is operatively mounted to said crankshaft and which is effective to selectively provide torque to said crankshaft, thereby altering said first speed;a sensor which measures said first speed and which generates a first signal based upon said measured first speed; anda controller which is communicatively coupled to said electric machine and to said sensor, said controller being effective to receive said first signal, to partition this signal into an ac component and a dc component, to process this partitioned signal by use of an inverse notch filter and, based upon said processed signal, to communicate a second signal to said electric machine, said second signal being effective to cause said electric machine to selectively provide torque to said crankshaft, effective to alter said first speed in a manner which substantially attenuates said oscillations.