Active brake retraction during regeneration
First Claim
1. A method of operating a brake-retract system during a regenerative braking event comprising:
- monitoring an amount of regenerative braking achieved;
linearly ramping a set point threshold from a first threshold to a max regeneration capacity if the amount of regenerative braking achieved exceeds a second threshold;
wherein the second threshold is less than the first threshold, wherein the first threshold is less than the max regeneration capacity, and wherein the max regeneration capacity is representative of a maximum amount of regenerative braking capable of being produced;
transitioning a friction element of a braking mechanism from a first, retracted-state to a second, ready-state if the amount of regenerative braking achieved exceeds the set point threshold; and
wherein the friction elements are closer to a brake rotor in the second, ready-state than in the first, retracted-state.
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Accused Products
Abstract
A method of operating a brake-retract system during a regenerative braking event begins with monitoring an amount of regenerative braking achieved. A set point threshold is linearly ramped from a first threshold to a max regeneration capacity if the amount of regenerative braking achieved exceeds a second threshold. The second threshold is less than the first threshold, and the first threshold is less than the max regeneration capacity. The max regeneration capacity is representative of a maximum amount of regenerative braking capable of being produced. A friction element is transitioned from a first, retracted-state to a second, ready-state if the amount of regenerative braking achieved exceeds the set point threshold.
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Citations
19 Claims
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1. A method of operating a brake-retract system during a regenerative braking event comprising:
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monitoring an amount of regenerative braking achieved; linearly ramping a set point threshold from a first threshold to a max regeneration capacity if the amount of regenerative braking achieved exceeds a second threshold;
wherein the second threshold is less than the first threshold, wherein the first threshold is less than the max regeneration capacity, and wherein the max regeneration capacity is representative of a maximum amount of regenerative braking capable of being produced;transitioning a friction element of a braking mechanism from a first, retracted-state to a second, ready-state if the amount of regenerative braking achieved exceeds the set point threshold; and wherein the friction elements are closer to a brake rotor in the second, ready-state than in the first, retracted-state. - View Dependent Claims (2, 3, 4, 5, 6, 7)
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8. A vehicle comprising:
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a vehicle traction battery; a motor/generator in power-flow communication with a plurality of vehicle wheels and in electrical communication with the vehicle traction battery, wherein the motor/generator is configured to perform regenerative braking such that a torque is received from the plurality of vehicle wheels and converted into an electrical energy that is provided to the vehicle traction battery; a friction braking mechanism in communication with each of the plurality of vehicle wheels, each respective friction braking mechanism including a movable friction element and a rotor, wherein the rotor is configured to rotate with the wheel, and wherein the movable friction element is configured to selectively apply a contact pressure to the rotor; wherein each friction element is configured to translate between a first, retracted-state and a second, ready-state, and wherein the friction elements are closer to a brake rotor in the second, ready-state than in the first, retracted-state; and a controller configured to; monitor an amount of regenerative braking achieved by the motor/generator; linearly ramp a set point threshold from a first threshold to a max regeneration capacity if the amount of regenerative braking achieved exceeds a second threshold;
wherein the second threshold is less than the first threshold, wherein the first threshold is less than the max regeneration capacity, and wherein the max regeneration capacity is representative of a maximum amount of regenerative braking capable of being produced;transition each respective friction element from the first, retracted-state to the second, ready-state if the amount of regenerative braking achieved exceeds the set point threshold. - View Dependent Claims (9, 10, 11, 12, 13, 14)
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15. A method of operating a brake-retract system during a regenerative braking event comprising:
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monitoring an amount of regenerative braking achieved; linearly ramping a set point threshold from a first threshold to a max regeneration capacity if the amount of regenerative braking achieved exceeds a second threshold;
wherein the second threshold is less than the first threshold, wherein the first threshold is less than the max regeneration capacity, and wherein the max regeneration capacity is representative of a maximum amount of regenerative braking capable of being produced;transitioning a friction element of a braking mechanism from a first, retracted-state to a second, ready-state if the amount of regenerative braking achieved exceeds the set point threshold; and transitioning the friction element from the first, retracted-state to the second, ready-state if a braking request is received from a vehicle system transitioning the friction element from the first, retracted-state to the second, ready-state if a vehicle speed is less than a predetermined threshold wherein the friction elements are closer to a brake rotor in the second, ready-state than in the first, retracted-state. - View Dependent Claims (16, 17, 18, 19)
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Specification