US 12,304,448 B2
Electro-mechanical brake and control method thereof
Dong Hwan Lim, Yongin-si (KR)
Assigned to HYUNDAI MOBIS CO., LTD., Seoul (KR)
Filed by HYUNDAI MOBIS CO., LTD., Seoul (KR)
Filed on Aug. 12, 2022, as Appl. No. 17/886,637.
Claims priority of application No. 10-2022-0058472 (KR), filed on May 12, 2022.
Prior Publication US 2023/0365107 A1, Nov. 16, 2023
Int. Cl. B60T 8/171 (2006.01); B60T 8/172 (2006.01); B60T 8/173 (2006.01); B60T 13/74 (2006.01)
CPC B60T 8/172 (2013.01) [B60T 8/171 (2013.01); B60T 8/173 (2013.01); B60T 13/746 (2013.01)] 18 Claims
OG exemplary drawing
 
1. An electro-mechanical brake comprising
a piston to push a brake pad towards a wheel disc by driving a motor in a vehicle;
a position detection unit that detects a position of the piston;
a current detection unit that detects a value of current applied to the motor; and
a contact point calculation unit that calculates a contact point, which is where the piston is located when the brake pad starts to come into contact with the wheel disc, based on the position of the piston and the value of the current applied to the motor, or based on a first position of the piston detected by the position detection unit with respect to a plurality of specified current values and a second position of the piston measured with respect to the plurality of specified current values,
wherein:
the plurality of specified current values is determined based on the current applied to the motor and a force measured with respect to the current applied to the motor, and
the plurality of specified current values is a plurality of current values in an area where the force changes linearly with the current applied to the motor within a predetermined margin of error.