Active brake retraction during regeneration
AssigneeGM Global Technology Operations LLC
InventorsGoro Tamai, Paul A. Stanowski
Life of this patent
Estimating the term…
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.
Claims19
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.
A vehicle comprising:
- 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.
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
- 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.
Dependencies are inferred from the claim text.