Abstract: A control strategy for a hybrid powertrain for an automotive vehicle comprising an internal combustion engine, a geared transmission mechanism for transmitting driving torque to the vehicle traction wheels, and an electric motor arranged in parallel with respect to the internal combustion engine at the torque input side of the transmission. A friction clutch connects and disconnects the engine from the torque flow path as transitions are made between an electric motor driving mode and an engine driving mode. A mechanical damper is located on the torque input side of the clutch. A transition from the electric motor drive mode to the internal combustion engine drive mode is achieved by controlling the engagement of the clutch using a closed loop clutch pressure modulation strategy and controlling the fuel supply to the engine to effect an engine drive mode without triggering undesirable inertia torque fluctuations in the powertrain.

Abstract: A system and method for controlling vehicle roll, such as during a cornering maneuver. The roll control system and method include a sensor for sensing roll of the vehicle, a roll control signal generator for generating a roll control signal in response to the sensed vehicle roll, a pressure differential valve for generating a high pressure fluid, and an actuator for compensating for the sensed vehicle body roll. The roll control system and method also include a fluid control device for controlling the actuator in response to the roll control signal. The control device ports both the actuator inlet and outlet to a fluid reservoir when the vehicle is driven along a straight line path, and ports one of the actuator inlet and outlet to the fluid reservoir and the other of the actuator inlet and outlet to the high pressure fluid when the vehicle is driven along a curved path.