Methods and system for regenerative hybrid vehicle braking
AssigneeFord Global Technologies, LLC
InventorsYanan Zhao, Ming Lang Kuang, Xiaoyong Wang, Dale Scott Crombez, Walter Joseph Ortmann
Life of this patent
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Abstract
Methods and systems are provided for operating a hybrid vehicle during operating conditions where vehicle braking is requested. In one example, regenerative braking is permitted during conditions of wheel slip so that a greater portion of a vehicle's kinetic energy may be recovered and stored as electrical energy. Additionally, in some examples, the amount of regenerative braking is adjusted responsive to a torque of a differential clutch during wheel slip conditions.
Claims20
A vehicle operating method, comprising:
- reducing speed of a first wheel via regenerative braking and friction braking;
- and
- reducing the friction braking of the first wheel in response to a slip of the first wheel greater than a slip threshold without reducing the regenerative braking of the first wheel, to reduce the slip of the first wheel to below the slip threshold.
A driveline operating method for a vehicle, comprising:
- adjusting friction braking torque of a first wheel to zero and friction braking torque of a second wheel to a non-zero value in response to a driveline power regeneration limit being greater than or equal to a threshold value;
- and
- adjusting regenerative braking torque of the first wheel and regenerative braking torque of the second wheel to non-zero values in response to the driveline power regeneration limit being greater than or equal to the threshold value while adjusting the friction braking torque of the first wheel and the second wheel, where the first wheel and the second wheel are rear wheels of the vehicle.
A driveline operating method, comprising:
- adjusting friction braking torque of a first wheel to a non-zero value and friction braking torque of a second wheel to a non-zero value in response to a driveline power regeneration limit being less than a threshold value, the driveline power regeneration limit a function of a state of charge of a battery and a temperature of an electric machine;
- and
- adjusting regenerative braking torque of the first wheel to half the driveline regeneration power limit and regenerative braking torque of the second wheel to half the driveline regeneration power limit in response to the driveline power regeneration limit being less than the threshold value, where the first wheel and the second wheel are rear wheels of a vehicle.
Dependencies are inferred from the claim text.