System and method for controlling drivetrain torque and hill holding of a hybrid vehicle
First Claim
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1. A system for controlling drivetrain torque in a hybrid electric vehicle having primary and secondary power sources, the system comprising:
- a power transfer unit for driving a vehicle traction wheel;
an electrical machine selectively coupled to the power transfer unit, the electrical machine being configured to provide traction torque to the traction wheel when powered by the primary or secondary power sources and impose a regenerative braking torque on the traction wheel when not powered by the primary or secondary power sources;
an acceleration control device for providing a first signal indicative of a level of traction torque requested by a vehicle operator; and
a brake control device for providing a second signal indicative of a level of braking torque requested by the vehicle operator;
wherein regenerative braking torque is provided by the electrical machine when engagement of a gear of the power transfer unit is requested by the vehicle operator, the speed of the hybrid electric vehicle is less than a creep speed value, and the level of braking torque indicated by the second signal exceeds the level of traction torque indicated by the first signal.
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Abstract
A system and method for controlling torque in a hybrid electric vehicle. The system provides a regenerative braking torque with an electrical machine when a level of braking torque indicated by actuation of a brake control device exceeds a level of traction torque indicated by actuation of an acceleration control device. The regenerative braking torque is supplemented by a friction braking system when the braking torque requested by a vehicle operator exceeds a maximum regenerative braking capacity of the electrical machine.
34 Citations
20 Claims
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1. A system for controlling drivetrain torque in a hybrid electric vehicle having primary and secondary power sources, the system comprising:
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a power transfer unit for driving a vehicle traction wheel; an electrical machine selectively coupled to the power transfer unit, the electrical machine being configured to provide traction torque to the traction wheel when powered by the primary or secondary power sources and impose a regenerative braking torque on the traction wheel when not powered by the primary or secondary power sources; an acceleration control device for providing a first signal indicative of a level of traction torque requested by a vehicle operator; and a brake control device for providing a second signal indicative of a level of braking torque requested by the vehicle operator; wherein regenerative braking torque is provided by the electrical machine when engagement of a gear of the power transfer unit is requested by the vehicle operator, the speed of the hybrid electric vehicle is less than a creep speed value, and the level of braking torque indicated by the second signal exceeds the level of traction torque indicated by the first signal. - View Dependent Claims (2, 3, 4, 5)
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6. A method of controlling torque in a hybrid electric vehicle drivetrain having an engine and an electrical machine for driving a vehicle wheel, the method comprising:
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actuating a friction brake system to inhibit rollback when a vehicle rollback condition exists; and providing a regenerative braking torque with the electrical machine when a desired braking torque exceeds a desired traction torque and turning off the engine when a brake control device is actuated and an acceleration control device is not actuated. - View Dependent Claims (7, 8, 9)
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10. A method of controlling torque in a drivetrain of a hybrid electric vehicle, the method comprising:
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actuating a friction braking system to inhibit rollback when speed of the hybrid electric vehicle is less than a creep speed value and a gear is selected; and providing a braking torque with an electrical machine to capture energy when a desired braking torque exceeds a desired traction torque. - View Dependent Claims (11, 12, 13, 14, 15, 16, 17, 18, 19, 20)
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Specification