Negative driveline torque control incorporating transmission state selection for a hybrid vehicle
AssigneeFord Global Technologies, LLC
InventorsIhab Soliman, Deepak Aswani
Life of this patent
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Abstract
A hybrid propulsion system for a passenger vehicle is provided. The system comprises a first and second electric motor in the drivetrain, in addition to a transmission. When each of the motors are providing braking torque, the transmission state is adjusted in response to the amounts of braking torque provided by the first and second motors.
Claims20
A method of controlling a hybrid propulsion system for a vehicle including at least an internal combustion engine and an electric motor, wherein said engine is coupled to at least one drive wheel of the vehicle via a transmission, the method comprising:
- receiving a vehicle braking request;
- adjusting a state of the transmission to increase a level of braking force provided to the drive wheel of the vehicle by the engine in response to the vehicle braking request;
- and
- varying a level of torque exchanged between the electric motor and the drive wheel responsive to the level of braking force provided by the engine.
A method for a hybrid propulsion system for a vehicle, the vehicle comprising at least one drive wheel, a first motor coupled to the drive wheel, a second motor, a transmission including a first end coupled to the drive wheel and a second end coupled to the second motor, and a control system, the method comprising:
- controlling operation of the first motor to provide vehicle braking torque;
- controlling operation of the second motor to provide vehicle braking torque;
- and
- adjusting a transmission state in response to an amount of braking torque provided by the first motor and an amount of braking torque provided by the second motor.
A method for a hybrid propulsion system for a vehicle, comprising at least one drive wheel;
- a first motor coupled to the drive wheel, said first motor configured to generate electrical energy from kinetic energy received at the drive wheel;
- a second motor configured to generate electrical energy from kinetic energy received at the drive wheel;
- a transmission including a first end coupled to the first motor and a second end coupled to the second motor;
- and a control system, the method comprising:
- varying a relative level of electrical energy generated by the first motor in response to an operating condition to provide vehicle braking;
- and
- varying a relative level of electrical energy generated by the second motor in response to the operating condition to provide vehicle braking.
Dependencies are inferred from the claim text.