Braking system of vehicle capable of regenerative braking and hydraulic braking and method of controlling the same
AssigneeHyundai Mobis Co., Ltd.
InventorJi Weon Ko
Life of this patent
Estimating the term…
Abstract
The present disclosure in at least one embodiment provides a braking system comprising: a pedal master unit; an electric booster unit; a reaction disc that generates a pedal force when compressed by at least one of the operating rod or the motor piston; and a controller that, upon receiving a regenerative braking interruption signal during the cooperative braking of the vehicle, senses a pressure change in the master cylinder and compensates for a displacement of the motor piston by an amount corresponding to the pressure change.
Claims10
A braking system configured to perform cooperative braking, a combination of regenerative braking and hydraulic braking, when braking a vehicle, the braking system comprising:
- a pedal master unit comprising a master cylinder and an operating rod configured to transmit a pedal effort generated by pressing a pedal to the master cylinder;
- an electric booster unit comprising a motor, a motor piston configured to compress the master cylinder, and a power transmission configured to convert a rotary motion of the motor into a linear motion of the motor piston;
- a reaction disc that generates a pedal force when compressed by at least one of the operating rod or the motor piston;
- and
- a controller that, upon receiving a regenerative braking interruption signal during the cooperative braking of the vehicle, senses a pressure change in the master cylinder and compensates for a displacement of the motor piston by an amount corresponding to the pressure change.
A method of controlling a braking system configured to perform cooperative braking, a combination of regenerative braking and hydraulic braking, when braking a vehicle, the method comprising:
- when a pedal is pressed, calculating, by a controller, a total braking force required to brake the vehicle based on a stroke of the pedal measured by a pedal travel sensor;
- calculating, by the controller, a regenerative braking force and a hydraulic braking force based on the total braking force required and determining a displacement of a motor piston to generate the hydraulic braking force;
- driving, by the controller, an electric booster unit based on the displacement of the motor piston;
- determining, by the controller, whether the regenerative braking is finished or not;
- and
- when the regenerative braking is determined to be finished, calculating, by the controller, a difference in hydraulic pressure in a master cylinder between a first point in time where the regenerative braking is finished and a second point in time which is after a preset time interval from the first point in time,
- wherein the calculating a displacement of the motor piston comprises calculating the displacement of the motor piston to be compensated for based on the calculated difference in hydraulic pressure.
Dependencies are inferred from the claim text.