Method for detecting a leakage during operation of a braking system for a vehicle and braking system for a vehicle

US10919512B2 · kind B2 · utility

Assignee

• Robert Bosch GmbH · DE

Inventors

• Bertram Foitzik · Ilsfeld, DE
• Timo Haible · Backnang, DE

Key dates

• Filing date: Aug 5, 2019
• Grant date: Feb 16, 2021
• Expiry date: Sep 9, 2039

Classification

• Technology area (CPC G): Physics
• CPC primary: G01M3/26
• WIPO field: Transport
• WIPO sector: Mechanical engineering

Abstract

A method is described for detecting a leakage during the operation of a braking system. A braking intention signal characterizing a braking intention is generated by actuating a final control system of an actuating circuit; a setpoint braking pressure required in an active circuit is ascertained based on the braking intention signal; an actual braking pressure in the active circuit is set according to the setpoint braking pressure with the aid of a pressure generation unit by moving a displacement piston to actuate a wheel brake coupled to the active circuit; and a pressure modulation is carried out. The pressure modulation includes setting the actual braking pressure in the active circuit to a value greater than the setpoint braking pressure, and lowering the actual braking pressure until the setpoint braking pressure is reached by moving the displacement piston at a predetermined piston speed. Furthermore, a chronological pressure gradient is ascertained, as the actual braking pressure is being lowered, during the pressure modulation, and a leakage of the active circuit is detected based on the ascertained pressure gradient when the pressure gradient is outside a range predetermi…