Patent ID: 7117964
Filing Date: 2006-10-10
Classification: B60K,B60W,Y02T

Abstract:
1. A method for controlling a hybrid powertrain for an automotive vehicle having a driver-controlled engine, an electric motor, a battery, a generator connected to the battery and a gear system, the power train establishing a split-power flow path for distributing power to vehicle traction wheels, the battery defining an electric power source, and the engine defining a mechanical power source, the method comprising the steps of: delivering engine torque to a first torque input element of the gear system, delivering reaction torque of the gear system to the generator and delivering torque from a torque output element of the gear system to the traction wheels thereby establishing a power-split in a first power delivery configuration; delivering torque from the electric power source through the gear system to the traction wheels with the engine deactivated thereby establishing a second power source configuration; coordinating power delivery from the mechanical and electrical power sources whereby a response to driver demand for power will optimize driveline efficiency and performance without exceeding power limits for the engine and the battery; the step of coordinating power delivery from the electric power source and the mechanical power source including the steps of establishing a request for battery power and a request for engine power, controlling actual battery power during an operating interval using a closed-loop feedback, and determining an error between the actual battery power and a requested battery power; and adjusting a battery power request during transient and steady-state operating conditions to change the request for engine power whereby the error becomes zero, the closed-loop feedback thereby minimizing unnecessary battery usage due to variable operating conditions.