Method for monitoring a brake system and brake system

摘要

A method for monitoring a brake system for motor vehicles. The system can be actuated both by a vehicle driver and independently of the vehicle driver in what is known as a brake-by-wire mode. The hydraulic actuation device can be actuated by means of a brake pedal and has a main brake cylinder to which wheel brakes are connected, at least two brake circuits, a simulation device, which comprises at least one elastic element and gives the vehicle driver a comfortable pedal feeling, an electrically controllable pressure-providing device, which is formed by a cylinder/piston assembly, the piston of which can be actuated by an electromagnetic actuator, wherein the first measurement variable (PDBE) characterizing a position of the piston is detected. The detected measurement value of the first and second measurement variable (SDBE, PDBE) are compared to a predetermined characteristic map of the first and second measurement variables in order to monitor a functional status of the brake system.

主权项

1. A method for monitoring a brake system for motor vehicles, which can be controlled in a brake-by-wire operating mode both by a vehicle driver and also independently of the vehicle driver, comprising the steps of;
providing a hydraulic actuation device operated by means of a brake pedal with a brake master cylinder, to which wheel brakes are connected through at least two brake circuits, and a simulation device having at least one elastic element, providing an electrically controllable pressure generating device, which is formed by a cylinder-piston assembly, having a piston which can be operated by an electromechanical actuation device, detecting a first measurement variable (PDBE) characterizing the pressure of the pressure generating device, providing an electronic control and regulating unit, detecting a second measurement variable (SDBE) characterizing a position or location of the piston, and for monitoring a functional state of the brake system the detected values of the first and the second measurement variable (SDBE, PDBE) are compared with a first specified characteristic field of the first and second measurement variables, wherein an actual system stiffness (C2) of the pressure generating device is determined from the values of the first and second measurement variables (PDBE, SDBE) as the derivative of the first measurement variable (PDBE) with respect to the second measurement variable (SDBE) or vice-versa.