US 11,872,971 B2
Method and apparatus for electric hydraulic brake
Yong Cheol Seol, Hwaseong-si (KR)
Assigned to HYUNDAI MOBIS CO., LTD., Seoul (KR)
Filed by HYUNDAI MOBIS CO., LTD., Seoul (KR)
Filed on Oct. 19, 2021, as Appl. No. 17/504,561.
Claims priority of application No. 10-2020-0176247 (KR), filed on Dec. 16, 2020.
Prior Publication US 2022/0185248 A1, Jun. 16, 2022
Int. Cl. B60T 8/17 (2006.01); B60T 8/26 (2006.01); B60T 8/1755 (2006.01); B60T 13/14 (2006.01); B60T 7/12 (2006.01); B60T 8/32 (2006.01); B60T 13/68 (2006.01)
CPC B60T 8/17551 (2013.01) [B60T 7/12 (2013.01); B60T 8/17 (2013.01); B60T 8/17558 (2013.01); B60T 8/26 (2013.01); B60T 8/262 (2013.01); B60T 8/266 (2013.01); B60T 8/268 (2013.01); B60T 8/326 (2013.01); B60T 13/142 (2013.01); B60T 13/686 (2013.01); B60T 2201/022 (2013.01); B60T 2201/03 (2013.01); B60T 2220/04 (2013.01); B60T 2270/304 (2013.01); B60T 2270/82 (2013.01); B60T 2270/88 (2013.01)] 13 Claims
OG exemplary drawing
 
1. A method of controlling an electro-hydraulic brake configured to perform an electronic brake-force distribution (EBD) control function, the method comprising:
an emergency braking determination operation including determining whether emergency braking is required for a vehicle;
a motor control operation including, in response to determining that the emergency braking is required, controlling a current flowing in a motor connected to a main master cylinder to increase a hydraulic pressure supplied to a plurality of wheel brakes including front and rear wheel brakes;
a rear wheel inlet valve closing operation including closing an inlet valve connected to the rear wheel brake for a predetermined time so that a first pressure at the rear wheel brake does not increase sooner than a second pressure at the front wheel brake;
a closed time period calculation operation including calculating a first time period for which the inlet valve has been maintained closed; and
a rear wheel inlet valve opening operation including:
determining whether the first time period exceeds a closed time period;
in response determining that the first time period does not exceed the closed time period, maintaining the inlet valve closed until the first time period reaches the closed time period; and
in response to determining that the first time period exceeds the closed time period, opening the inlet valve,
wherein the predetermined closed time period is between a first time when the inlet valve is closed and a second time when V1+f(P)≤V2−Vsub is satisfied, wherein V1 denotes a first amount of fluid recovered to a reservoir using a first backup valve, f(P) denotes an amount of inflow fluid introduced into a line in a hydraulic circuit so that the line supplies a pressure of the second main chamber to the rear wheel brake, V2 denotes a second amount of fluid introduced into the second main chamber, and Vsub denotes a third amount of fluid discharged from a backup master cylinder.