US 11,987,222 B2
Method and control unit for operating a hydraulic braking system, braking system, and motor vehicle
Timo Haible, Backnang (DE); and Anatoly Malkin, Stuttgart (DE)
Assigned to ROBERT BOSCH GMBH, Stuttgart (DE)
Appl. No. 17/431,684
Filed by Robert Bosch GmbH, Stuttgart (DE)
PCT Filed Jul. 11, 2019, PCT No. PCT/EP2019/068746
§ 371(c)(1), (2) Date Oct. 5, 2021,
PCT Pub. No. WO2020/030376, PCT Pub. Date Feb. 13, 2020.
Claims priority of application No. 102018213330.1 (DE), filed on Aug. 8, 2018.
Prior Publication US 2022/0135015 A1, May 5, 2022
Int. Cl. B60T 17/22 (2006.01); B60Q 9/00 (2006.01); B60T 8/32 (2006.01); B60T 13/74 (2006.01)
CPC B60T 17/221 (2013.01) [B60Q 9/00 (2013.01); B60T 8/326 (2013.01); B60T 13/745 (2013.01); B60T 2270/413 (2013.01)] 9 Claims
OG exemplary drawing
 
1. A method for operating a hydraulic braking system, the hydraulic braking system including at least one actuatable actuator, wherein the actuator is (a) configured to generate a hydraulic brake pressure using a brake fluid in the braking system, (b) includes a pressure chamber for the brake fluid and a displaceable piston configured to decrease or increase a volume of the pressure chamber, (c) for carrying out a braking process, is activatable to increase the hydraulic pressure in the braking system from a starting pressure to a brake pressure by decreasing the volume, and (d) for concluding the braking process, is configured to reduce the hydraulic pressure to the starting pressure by increasing the volume, the method comprising:
ascertaining a first leakage loss of the brake fluid in the braking system as a function of the volume of the pressure chamber at the starting pressure at the beginning of the braking process and the volume of the pressure chamber when the starting pressure is reached at the conclusion of the braking process;
continuously calculating a second leakage loss of the brake fluid while the braking process is carried out; and
comparing the first leakage loss to the second leakage loss for a plausibility check after the braking process has been carried out.