US 12,479,411 B2
Method for operating a vehicle brake system, and vehicle brake system
Joerg Knieper, Vallendar (DE); Kraig Gerber, Plymouth, MI (US); Marco Becker, Oberduerenbach (DE); Peter Maeurer, Koblenz (DE); and Paul Wecker, Limburg (DE)
Assigned to ZF ACTIVE SAFETY GMBH, Koblenz (DE); and ZF ACTIVE SAFETY US INC., Livonia, MI (US)
Filed by ZF Active Safety GmbH, Koblenz (DE); and ZF Active Safety US Inc., Livonia, MI (US)
Filed on Sep. 30, 2022, as Appl. No. 17/956,904.
Prior Publication US 2024/0109528 A1, Apr. 4, 2024
Int. Cl. B60T 17/22 (2006.01); B60T 13/66 (2006.01)
CPC B60T 17/221 (2013.01) [B60T 13/662 (2013.01); B60T 2270/406 (2013.01); B60T 2270/88 (2013.01); B60T 2270/89 (2013.01)] 16 Claims
OG exemplary drawing
 
1. A method for operating a vehicle brake system, wherein the vehicle brake system comprises at least one hydraulic vehicle brake (10), having a brake caliper (12), having a brake piston (16), having a brake piston seal (20) which is assigned to the brake caliper (12) and which acts between the brake caliper (12) and brake piston (16), having brake pads (22), and having a brake disk (24), the method having the following method steps:
a) building up a hydraulic brake pressure, which acts on the brake piston (16), in a manner dependent on a braking command, and generating a clamping force between the brake disk (24) and the brake pads (22);
b) holding the brake pressure in a manner dependent on the braking command;
c) upon withdrawal of the braking command, reducing the hydraulic brake pressure acting on the brake piston (16) to a hydraulic intermediate pressure or an intermediate state of strain of at least one part of the hydraulic vehicle brake;
d) holding the hydraulic intermediate pressure or the intermediate state of strain for a predefined second period of time; and
e) reducing the hydraulic brake pressure.