US 12,151,660 B2
Method for venting a cylinder of a piston-cylinder unit of a power brake pressure generator of a hydraulic power brake system
Herbert Vollert, Vaihingen/Enz (DE); and Ralf Kinder, Auenstein (DE)
Assigned to ROBERT BOSCH GMBH, Stuttgart (DE)
Appl. No. 18/550,936
Filed by Robert Bosch GmbH, Stuttgart (DE)
PCT Filed Jul. 13, 2022, PCT No. PCT/EP2022/069570
§ 371(c)(1), (2) Date Sep. 15, 2023,
PCT Pub. No. WO2023/016739, PCT Pub. Date Feb. 16, 2023.
Claims priority of application No. 10 2021 208 783.3 (DE), filed on Aug. 11, 2021.
Prior Publication US 2024/0294161 A1, Sep. 5, 2024
Int. Cl. B60T 17/22 (2006.01); B60T 13/66 (2006.01); F15B 13/042 (2006.01)
CPC B60T 17/222 (2013.01) [B60T 13/662 (2013.01); F15B 13/042 (2013.01)] 8 Claims
OG exemplary drawing
 
1. A method for venting a cylinder of a piston-cylinder unit of a power brake pressure generator of a hydraulic power brake system, wherein the cylinder of the piston-cylinder unit of the power brake pressure generator is connected by a plunger valve to a brake circuit of the power brake system and by a connection valve to a brake fluid container, and wherein a piston of the piston-cylinder unit in the cylinder of the piston-cylinder unit is sealed with a first piston seal, which can be overflowed from the brake fluid container into the cylinder of the piston cylinder unit of the power brake pressure generator in the manner of a pressure relief valve in the event of a negative pressure in the cylinder of the piston-cylinder unit of the power brake pressure generator relative to a pressure in the brake fluid container, the method comprising the following steps:
displacing, with the plunger valve closed and the connection valve closed, the piston of the piston-cylinder unit of the power brake pressure generator from a forward-displaced position back in a direction of a home position, wherein the piston generates a negative pressure in the cylinder of the piston-cylinder unit of the power brake pressure generator in such a way that brake fluid is sucked from the brake fluid container, flows over the first piston seal and flows into the cylinder of the piston-cylinder unit of the power brake pressure generator; and
subsequently displacing again, with the connection valve open and the plunger valve closed, the piston forward in a direction of a displacement stroke in the cylinder of the piston-cylinder unit of the power brake pressure generator, so that brake fluid is pushed from the cylinder of the piston-cylinder unit of the power brake pressure generator through the open connection valve into the brake fluid container.