System and Method for Controlling a Driveline in a Hybrid Vehicle
AssigneeFord Global Technologies, LLC
InventorsPeter John Grutter, Andreas E. Perakes, Nicholas E. McCubbin
Life of this patent
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Abstract
A system and a method for controlling a hybrid vehicle powertrain during a change from a two-wheel drive mode to a four-wheel drive mode is provided. In response to a request to couple the second pair of wheels to the powertrain, a driveline controller commands an increased torque from the electric motor to be applied to the first pair of wheels The increased torque from the electric motor is based on an AWD engagement torque of the second pair of wheels to counteract an engagement torque of a second pair of drive wheels before changing from the two-wheel drive mode to the four-wheel drive mode.
Claims20
A hybrid vehicle being operable to change between a two-wheel drive mode and an all-wheel drive (AWD) mode, the hybrid vehicle comprising:
- a powertrain including an electric motor;
- a primary driveline having a primary pair of drive wheels;
- a secondary driveline having a secondary pair of drive wheels;
- an AWD disconnect device arranged to couple the powertrain to the secondary pair of wheels when AWD mode is required;
- and
- a controller configured to command, in response to a request to engage the AWD disconnect device, the electric motor to apply a torque to the primary driveline based on an AWD engagement torque of the secondary driveline such that the secondary driveline accelerates while a speed of the secondary driveline is less than a speed of the primary driveline.
A vehicle control system comprising:
- a powertrain including an electric motor;
- first and second pairs of wheels;
- and
- a driveline controller configured to command, in response to a request to couple the second pair of wheels to the powertrain, an increased torque from the electric motor to the first pair of wheels based on an AWD engagement torque of the second pair of wheels before coupling the second pair of wheels to the powertrain.
A method for controlling a hybrid vehicle powertrain during a change from a two-wheel drive mode to a four-wheel drive mode, the method comprising:
- in response to the request to change from the two-wheel drive mode to the four-wheel drive mode, providing an increased torque by an electric-motor to a first pair of drive wheels to counteract an engagement torque of a second pair of drive wheels before changing from the two-wheel drive mode to the four-wheel drive mode.
Dependencies are inferred from the claim text.