Systems and methods for dual clutch transmission clutch adaptation in a hybrid vehicle
AssigneeFord Global Technologies, LLC
InventorsJason Meyer, Matthew John Shelton, Michael Glenn Fodor
Life of this patent
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Abstract
Methods and systems are provided for adapting a pressure to torque transfer function of a clutch of a dual clutch transmission. In one example, a method includes operating a first clutch of the dual clutch transmission at a selected capacity to change a speed of a first transmission input shaft to a desired speed, adjusting values of a torque transfer function of the first clutch based on a rate of the speed change, and maintaining driver demanded wheel torque during the adjusting via controlling torque output of an electric motor positioned in the driveline. In this way, the method may be used to adapt both positive and negative torque transfer functions.
Claims20
A driveline operating method for a vehicle comprising:
- operating a first clutch of a dual clutch transmission at a selected capacity to change a speed of a first transmission input shaft to a desired speed;
- adjusting values of a torque transfer function of the first clutch based on a rate of the speed change;
- and
- maintaining driver demanded wheel torque during the adjusting via controlling torque output of an electric motor positioned in the driveline.
A system for a vehicle comprising:
- a dual clutch transmission with a first input shaft, a first input shaft clutch, a first layshaft, odd gears removably coupled to the first input shaft, a second input shaft, a second input shaft clutch, a second layshaft, even gears removably coupled to the second input shaft, and a plurality of synchronizers;
- an engine positioned upstream of the dual clutch transmission;
- an electric motor positioned upstream of the dual clutch transmission;
- an electric machine positioned downstream of the dual clutch transmission;
- an engine speed sensor;
- a first input shaft speed sensor and a second input shaft speed sensor;
- and
- a controller, storing instructions in non-transitory memory, that when executed, cause the controller to:
- in response to conditions being met for adapting a dual clutch transmission pressure to torque transfer function, disengage a first synchronizer from a first gear transferring torque between the first input shaft and the first layshaft, apply a desired capacity to the first clutch to change a speed of the first input shaft to a desired speed, monitor a rate of change of speed of the first input shaft during the applying the desired capacity to the first clutch, adjust values of the torque transfer function of the first clutch based on the rate of speed change and first input shaft inertia;
- and
- maintain driver demanded wheel torque during adjusting the values of the torque transfer function.
A method comprising:
- in a first condition, adjusting values of a pressure to torque transfer function of a first clutch of a dual clutch transmission by applying a desired capacity to the first clutch to decrease speed of a first input shaft of the dual clutch transmission to a first desired speed;
- in a second condition, adjusting values of the transfer function by applying the desired capacity or a second desired capacity to the first clutch to increase speed of the first input shaft to a second desired speed;
- and
- maintaining a desired wheel torque during the adjusting values of the transfer function in both the first and second conditions.
Dependencies are inferred from the claim text.