Importance

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Abstract

A hybrid electric vehicle drive system and a control system for controlling a hybrid drive system are provided. The drive system includes a housing, an input shaft for inputting motive power from an internal combustion engine and an output shaft operatively linked to at least one drive wheel. The drive system also includes a first electric motor disposed within the housing and having a first rotor and a stator fixed to the housing and a second electric motor disposed within the housing and having a second rotor and a stator fixed to the housing. The drive system further includes gearing disposed within the housing and coupled to the second rotor to transmit revolutions of the second rotor to the output shaft. The drive system still further includes a planetary gear set disposed within the housing. The gear set includes a first rotary element coupled to the input shaft, a second rotary element coupled to the first rotor and a third rotary element coupled to the gearing. The gearing transmits revolutions of the third rotary element to the output shaft. The drive system also includes a controllable overrunning coupling assembly including a first coupling member fixed to the housing and a second coupling member coupled to the second rotary element and supported for rotation relative to the first coupling member in an overrun mode and coupled to the first coupling member in a locked mode. The second rotary element is locked to the housing in the locked mode of the coupling assembly.

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First Claim