Gm Global Technolgoy Operations, Inc.

K V Hebbale

Chunhao J Lee

Norman K Bucknor

Farzad Samie

Dongxu Li

Chi-Kuan Kao

Neeraj S Shidore

Heather N Allen

A low-voltage hybrid powertrain system for a vehicle includes an engine that is coupled via an engine disconnect clutch to an input member of the transmission, and a low-voltage electric machine is coupled to the transmission. The powertrain system operates in an electric vehicle (EV) mode with the engine in an OFF state and with the engine disconnect clutch in an open/deactivated state. When an output torque request indicates a command for vehicle acceleration, the electric machine is controlled to generate torque in response to the output torque request and the engine is simultaneously cranked and started. Upon starting, the engine operates in a speed control mode to activate the engine disconnect clutch. The engine and the low-voltage electric machine are controlled to generate torque in response to the output torque request when the engine disconnect clutch is activated.

Hybrid powertrain system

A powertrain system includes a torque generating device to transfer torque to a driveline via a CVT, wherein the CVT includes a first pulley coupled to a second pulley via a flexible continuous device to transfer torque therebetween. A controller including a processor and memory is operatively connected to the CVT. The controller includes an instruction set that is executable to dynamically monitor operating parameters associated with an input force and an output force of the CVT and determine an amplitude variation of one of the operating parameters. The controller is disposed to detect an impending slip event based upon the amplitude variation, wherein the impending slip event is associated with a macro-slip condition on the flexible continuous device. Operation of the CVT is controlled to preclude the impending slip event.

Method and apparatus to control a continuously variable transmission

Growing community of inventors

Troy, MI, United States of America

K V Hebbale