Vehicle creep control in a hybrid electric vehicle

Details Vehicle creep control in a hybrid electric vehicle Vehicle creep control in a hybrid electric vehicle

2007-10-05

2011-10-25

Holmes, Justin (Department: 3655)

Interrelated power delivery controls, including engine control

Plural engines

Electric engine

C477S174000

Reexamination Certificate

active

08043194

ABSTRACT:
In a powertrain that includes wheels for driving a vehicle, an engine including a crankshaft, a machine driveably connected to the crankshaft and able to operate alternately as an electric motor and electric generator, a transmission including an input clutch driveably connected to the crankshaft and an output driveably connected to at least two of the wheels, and an electric storage battery having a variable state of charge and electrically connected to the machine, a method for controlling vehicle creep including adjusting a torque capacity of the input clutch to a desired magnitude of input clutch torque transmitted to the wheels, determining a desired change in torque produced by the machine such that a speed of the crankshaft is controlled to a desired idle speed, using the magnitude of input clutch torque capacity and the desired change in torque produced by the machine to determine a desired magnitude machine torque, and using the machine to produce said desired magnitude of machine torque.

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