Method and control unit for operating a braking system and braking system
AssigneeRobert Bosch GmbH
InventorWadim Henning
Life of this patent
Estimating the term…
Abstract
A method for ascertaining a leakage in a hydraulic braking system of a motor vehicle, the braking system including at least one hydraulically actuatable wheel brake, at least one pressure generator and at least one discharge valve which is assigned to the wheel brake and actuated as a function of a driving situation of the motor vehicle to maintain driving stability, and a hydraulic volume of the braking system being monitored. It is provided that the leakage is ascertained as a function of the ascertained hydraulic volume and as a function of an actuation of the discharge valve.
Claims13
A method for ascertaining a leakage in a hydraulic braking system of a motor vehicle, the braking system including at least one hydraulically actuatable wheel brake, at least one pressure generator, and at least one discharge valve which is (a) assigned to the at least one hydraulically actuatable wheel brake and (b) connected to a brake fluid reservoir for returning brake fluid from the at least one hydraulically actuatable wheel brake to the brake fluid reservoir for pressure reduction, the method comprising:
- ascertaining a hydraulic volume of the braking system;
- and
- ascertaining the leakage as a function of the ascertained hydraulic volume and as a function of the actuation of the discharge valve.
A method for ascertaining a leakage in a hydraulic braking system of a motor vehicle, the braking system including at least one hydraulically actuatable wheel brake, at least one pressure generator, and at least one discharge valve which (a) is assigned to the at least one hydraulically actuatable wheel brake and (b) is actuatable as a function of a driving situation of the motor vehicle to maintain a driving stability, the method comprising:
- ascertaining a hydraulic volume of the braking system;
- ascertaining a volume loss in the braking system as a function of an actuation of the at least one discharge valve, a throttle cross section and a pressure difference via the at least one discharge valve at the throttle cross section;
- and
- ascertaining the leakage from a difference between the ascertained hydraulic volume and the ascertained volume loss.
A method for ascertaining a leakage in a hydraulic braking system of a motor vehicle, the braking system including at least one hydraulically actuatable wheel brake, at least one pressure generator, and at least one discharge valve which (a) is assigned to the at least one hydraulically actuatable wheel brake and (b) is actuatable as a function of a driving situation of the motor vehicle to maintain a driving stability, the method comprising:
- ascertaining a hydraulic volume of the braking system;
- ascertaining a volume loss in the braking system, with the aid of a Bernoulli/Darcy-Weisbach equation, as a function of an actuation of the at least one discharge valve;
- and
- ascertaining the leakage from a difference between the ascertained hydraulic volume and the ascertained volume loss.
A control unit for operating a braking system of a motor vehicle, the braking system including at least one hydraulically actuatable wheel brake, at least one pressure generator, and at least one discharge valve (a) assigned to the at least one hydraulically actuatable wheel brake and (b) connected to a brake fluid reservoir for returning brake fluid from the at least one hydraulically actuatable wheel brake to the brake fluid reservoir for pressure reduction, the control unit being configured to ascertain a leakage of the brake fluid of the braking system, the control unit configured to:
- ascertain a hydraulic volume of the braking system;
- and
- ascertain the leakage as a function of the ascertained hydraulic volume and as a function of an actuation of the discharge valve.
A braking system for a motor vehicle, comprising:
- at least one hydraulically actuatable wheel brake;
- at least one pressure generator;
- at least one discharge valve assigned to the at least one hydraulically actuatable wheel brake and connected to a brake fluid reservoir for returning brake fluid from the at least one hydraulically actuatable wheel brake to the brake fluid reservoir for pressure reduction;
- and
- a control unit being configured to ascertain a hydraulic volume of the braking system and ascertain a leakage of the brake fluid as a function of the ascertained hydraulic volume and as a function of an actuation of the discharge valve.
Dependencies are inferred from the claim text.