US 11,807,201 B2
Hydraulic motor vehicle brake system and method for operating same
Heinrich Plewnia, Niederhofen (DE)
Assigned to ZF Active Safety GmbH, Koblenz (DE)
Filed by ZF Active Safety GmbH, Koblenz (DE)
Filed on Dec. 16, 2019, as Appl. No. 16/715,567.
Claims priority of application No. 102018010168.2 (DE), filed on Dec. 28, 2018.
Prior Publication US 2020/0207321 A1, Jul. 2, 2020
Int. Cl. B60T 13/74 (2006.01); B60T 13/58 (2006.01); B60T 13/14 (2006.01); B60T 13/68 (2006.01); B60T 8/17 (2006.01); B60T 8/176 (2006.01)
CPC B60T 13/58 (2013.01) [B60T 8/17 (2013.01); B60T 8/176 (2013.01); B60T 13/148 (2013.01); B60T 13/686 (2013.01); B60T 2270/10 (2013.01); B60T 2270/402 (2013.01); B60T 2270/403 (2013.01); B60T 2270/413 (2013.01)] 13 Claims
OG exemplary drawing
 
1. A hydraulic motor vehicle brake system having front wheel brakes and rear wheel brakes, comprising:
a first functional unit having
at least one first hydraulic pressure generator, which is designed to build up a respective hydraulic pressure at the front wheel brakes and the rear wheel brakes;
a first valve assembly, which is arranged between the first hydraulic pressure generator and the front wheel brakes; and
a second valve assembly, which is arranged between the first hydraulic pressure generator and the rear wheel brakes, wherein the first valve assembly comprises at least one digitally switchable first valve and/or the second valve assembly comprises at least one digitally switchable second valve; and
a second functional unit having
at least one second, electric hydraulic pressure generator, which is controllable in order to build up a respective hydraulic pressure at the front wheel brakes and the rear wheel brakes; and
a third valve assembly for each wheel brake, which can be controlled for wheel brake pressure control operations at the corresponding wheel brake; and
a control system, which is designed to control at least one of the first valve assembly and the second valve assembly in the case of hydraulic pressure generation by means of the first hydraulic pressure generator in the event of a malfunction of the second functional unit, such that a lower hydraulic pressure is established at the rear wheel brakes than at the front wheel brakes, the control system being further designed to keep the at least one digitally switchable second valve closed in the event of a malfunction of the second functional unit in order to build up a hydraulic pressure exclusively at the front wheel brakes.