US 11,834,019 B2
Hydraulic braking system having an electronic control unit and method for operating same
Claus Müller, Wolfratshausen (DE); Reinhard Loebner, Munich (DE); Marcus Clev, Munich (DE); and Fabian Elwischger, Neufahrn (DE)
Assigned to KNORR-BREMSE SYSTEME FÜR SCHIENENFAHRZEUGE GMBH
Appl. No. 16/635,716
Filed by KNORR-BREMSE SYSTEME FÜR SCHIENENFAHRZEUGE GMBH, Munich (DE)
PCT Filed Jul. 26, 2018, PCT No. PCT/EP2018/070304
§ 371(c)(1), (2) Date Jan. 31, 2020,
PCT Pub. No. WO2019/025282, PCT Pub. Date Feb. 7, 2019.
Claims priority of application No. 10 2017 117 399.4 (DE), filed on Aug. 1, 2017.
Prior Publication US 2021/0129818 A1, May 6, 2021
Int. Cl. B60T 13/16 (2006.01); B60T 13/68 (2006.01); B60T 13/66 (2006.01); B60T 13/74 (2006.01)
CPC B60T 13/686 (2013.01) [B60T 13/662 (2013.01); B60T 13/16 (2013.01); B60T 13/745 (2013.01); B60Y 2400/81 (2013.01)] 17 Claims
OG exemplary drawing
 
1. A hydraulic braking system for braking a vehicle wheel in accordance with a braking pressure control, the system comprising:
a hydraulic pump driven by an electric motor for hydraulic pressure generation; and
an electronic control unit for the determination of at least one control value for compensating a control error based on a measured actual braking pressure compared to a pressure demand setpoint, which controls the electric motor as an actuator for a pressure increase or a pressure reduction of the braking pressure when adjusting to the pressure demand setpoint,
wherein the electronic control unit controls the electric motor as the actuator to compensate the control error in such a way that in one direction of rotation the hydraulic pump causes a pressure increase of the braking pressure and in the other direction of rotation causes a pressure reduction of the braking pressure,
wherein a shut-off valve controlled by the electronic control unit is located in a pressure line between and interconnecting the hydraulic pump and a brake actuator and a pressure limiting valve is positioned upstream the shut-off valve to dissipate an overpressure in the pressure line from the hydraulic pump, and
wherein a safety brake valve is located downstream the shut-off valve along the pressure line and configured to introduce dosed braking via a downstream choke and a full parking braking force.