US 11,052,891 B2
Brake system and method for operating a brake system
Mathias Niepelt, Friedberg (DE); Iris Halbe, Butzbach (DE); Thorsten Wickenhöfer, Hofheim (DE); Ralf Richard Reviol, Dietzenbach-Steinberg (DE); and Klaus Berger, Frankfurt (DE)
Assigned to Continental Teves AG & Co. OHG, Frankfurt am Main (DE)
Filed by Continental Teves AG & Co. oHG, Frankfurt (DE)
Filed on Mar. 29, 2018, as Appl. No. 15/940,313.
Application 15/940,313 is a continuation of application No. PCT/EP2016/072403, filed on Sep. 21, 2016.
Claims priority of application No. 10 2015 219 001.3 (DE), filed on Oct. 1, 2015.
Prior Publication US 2018/0222464 A1, Aug. 9, 2018
Int. Cl. B60T 13/58 (2006.01); B60T 8/88 (2006.01); B60T 8/17 (2006.01); B60T 13/66 (2006.01); B60T 8/40 (2006.01)
CPC B60T 13/588 (2013.01) [B60T 8/17 (2013.01); B60T 8/885 (2013.01); B60T 13/66 (2013.01); B60T 8/4081 (2013.01); B60T 2270/404 (2013.01); B60T 2270/82 (2013.01)] 11 Claims
OG exemplary drawing
 
1. An electrohydraulic brake system for a motor vehicle comprising:
a brake master cylinder which are actuated by a brake pedal, for actuating wheel brakes;
a pressure generating device, which is activated electronically;
an additional brake actuator, which is activated electronically,
an open- and closed-loop control unit, wherein in a normal mode of operation, the open- and closed-loop control unit detects a braking demand on the basis of the actuation of the brake pedal by the driver and activates the pressure generating device to build up braking torque at the wheel brakes;
wherein in a fallback mode, when the pressure generating device is not activated the driver gains access to the wheel brakes and the open- and closed-loop control unit activates the additional brake actuator to build up braking torque;
wherein in the fallback mode the open- and closed-loop control unit monitors the brake pedal travel and activates the additional brake actuator to build up braking torque when a predetermined pedal travel threshold value is reached; and
wherein in the event of a succession of brake pedal actuations by the driver the pedal travel threshold value is increased at least once.