US 12,291,177 B2
Method for testing a function in a hydraulic vehicle power brake system
Ralf Kinder, Auenstein (DE); Anatoly Malkin, Stuttgart (DE); and Sabrina Lutz, Fellbach (DE)
Assigned to ROBERT BOSCH GMBH, Stuttgart (DE)
Appl. No. 17/915,394
Filed by Robert Bosch GmbH, Stuttgart (DE)
PCT Filed Sep. 20, 2021, PCT No. PCT/EP2021/075781
§ 371(c)(1), (2) Date Sep. 28, 2022,
PCT Pub. No. WO2022/089835, PCT Pub. Date May 5, 2022.
Claims priority of application No. 10 2020 213 766.8 (DE), filed on Nov. 2, 2020.
Prior Publication US 2023/0127912 A1, Apr. 27, 2023
Int. Cl. B60T 17/22 (2006.01)
CPC B60T 17/221 (2013.01) 8 Claims
OG exemplary drawing
 
1. A testing method for a hydraulic vehicle power brake system, the power brake system including (I) a pressure regulating module and (II) a pressure generating module, wherein the pressure generating module includes (i) a power brake pressure generator, (ii) a master brake cylinder, (iii) one or more power generator separating valves between an outlet arrangement of the power brake pressure generator and an outlet of the pressure generating module, (iv) one or more cylinder separating valves between an outlet arrangement of the master brake cylinder and the outlet of the pressure generating module, and the pressure regulating module includes (i) regulating module separating valves to which the outlet of the pressure generating module is connected such that the pressure generating module and the pressure regulating module are hydraulically connectable to each other by an open state of the regulating module separating valves and an open state of at least one of (a) the one or more power generator separating valves and (b) the cylinder separating valves, (ii) inlet valves via which brake fluid supplied by the pressure generating module to the pressure regulating module is applicable by the pressure regulating module to hydraulic wheel brakes, and (iii) outlet valves via which the brake fluid is returnable from the hydraulic wheel brakes, the returnable brake fluid being returnable from the wheel brakes to a brake fluid reservoir via the regulating module separating valves and the outlet of the pressure generating module, the method comprising:
(a) controlling the hydraulic vehicle power brake system to be in a first predefined state in which (i) the one or more cylinder separating valves are all closed so that the master brake cylinder is entirely separated from the pressure regulating module and from the power brake pressure generator, (ii) the one or more power generator separating valves are open, (iii) the regulating module separating valves are open so that the power brake pressure generator and the pressure regulating module are hydraulically connected via the open one or more power generator separating valves and the open regulating module separating valves, (iv) the inlet valves are open, and (v) the outlet valves are closed;
(b) while the hydraulic vehicle power brake system is in the first predefined state, generating a brake pressure by the power brake pressure generator, which is introduced into the pressure regulating module via the open one or more power generator separating valves and the open regulating module separating valves and applied by the pressure regulating module at the wheel brakes via the open inlet valves;
(c) subsequent to (b), closing the regulating module separating valves, thereby entering into a pressure locking state in which the pressure generating module is hydraulically disconnected from the pressure regulating module and the introduced brake pressure is locked in the pressure regulating module; and
(d) while in the pressure locking state, performing a function test that tests functionality of the pressure generating module.