US 12,391,227 B2
Electronic brake system and method for controlling same
Hakburm Kim, Seoul (KR)
Assigned to HL MANDO CORPORATION, Gyeonggi-do (KR)
Appl. No. 17/797,423
Filed by HL MANDO CORPORATION, Gyeonggi-do (KR)
PCT Filed Feb. 4, 2021, PCT No. PCT/KR2021/001464
§ 371(c)(1), (2) Date Aug. 3, 2022,
PCT Pub. No. WO2021/158032, PCT Pub. Date Aug. 12, 2021.
Claims priority of application No. 10-2020-0013295 (KR), filed on Apr. 2, 2020.
Prior Publication US 2023/0092049 A1, Mar. 23, 2023
Int. Cl. B60T 8/94 (2006.01); B60Q 9/00 (2006.01); B60T 7/04 (2006.01); B60T 8/32 (2006.01); B60T 8/58 (2006.01); B60T 17/22 (2006.01)
CPC B60T 8/94 (2013.01) [B60Q 9/00 (2013.01); B60T 7/042 (2013.01); B60T 8/3205 (2013.01); B60T 8/326 (2013.01); B60T 8/58 (2013.01); B60T 17/22 (2013.01); B60T 2220/04 (2013.01); B60T 2250/00 (2013.01); B60T 2270/402 (2013.01); B60T 2270/406 (2013.01); B60T 2270/88 (2013.01); B60Y 2400/90 (2013.01)] 8 Claims
OG exemplary drawing
 
1. An electronic brake system comprising:
a master cylinder configured to pressurize and discharge pressurized medium;
a reservoir coupled to the master cylinder and in which the pressurized medium is stored;
a hydraulic pressure supply device configured to generate a hydraulic pressure by moving a hydraulic piston forward or backward and having a first pressure chamber provided on a front side of the hydraulic piston and a second pressure chamber provided on a rear side of the hydraulic piston;
a hydraulic control unit configured to control a flow of the hydraulic pressure to be transmitted from the hydraulic pressure supply device to a wheel cylinder;
a longitudinal acceleration sensor configured to detect a longitudinal acceleration of a vehicle;
a pedal displacement sensor configured to detect a displacement of a brake pedal; and
a controller configured to control the hydraulic pressure supply device and the hydraulic control unit,
wherein the controller is configured to, in a degraded performance mode in which braking performance of the degraded performance mode is degraded more than braking performance of a normal braking mode and a first cut valve and a second cut valve are closed to close flow paths between a master cylinder and the hydraulic control unit, control the hydraulic pressure supply device based on a rotational force of a motor,
determine the hydraulic pressure generated by the hydraulic pressure supply device based on the longitudinal acceleration of the vehicle when controlling in the degraded performance mode,
determine a target pressure based on the displacement of the brake pedal,
during control in the degraded performance mode, determine whether brake pressure formation is abnormal based on the determined hydraulic pressure and the target pressure, and
convert the degraded performance mode to a fallback mode in which the pressurized medium discharged from the master cylinder is directly supplied to the hydraulic control unit when the brake pressure formation is abnormal, and
wherein the first cut valve and the second cut valve are installed in each of the flow paths.