Patent ID: 7232402
Filing Date: 2007-06-19
Classification: F16D,F16F,F16H,Y10T

Abstract:
1. A powertrain having an internal combustion engine characterized as generating compression pulses during start and/or stop modes of operation and torsionals during other modes of operation and an electrically variable transmission, comprising: a transmission housing; a torsional damper assembly enclosed within said transmission housing; a damper flange, in said torsional damper assembly, rotatable with said engine, having a damper spring enabling the torsional damper assembly to absorb such engine torsionals during the other modes of operation; a lock-out clutch selectively engageable with said damper flange for locking out said damper spring; at least one electric motor in the electrically variable transmission operable to selectively cancel the engine compression pulses when the damper spring is locked out; and an auxiliary pump powered by an electric motor and operable to pump hydraulic fluid to said torsional damper assembly and the transmission when the engine is not operating.