METHOD FOR MONITORING A BRAKE FOR MOTOR VEHICLES, BRAKE SYSTEM FOR IMPLEMENTING THE METHOD, AND MOTOR VEHICLE COMPRISING SAME

摘要

The invention relates to a method for monitoring a pneumatically actuatable brake for motor vehicles, wherein an air gap of the brake is detected using measured position values (13) of a brake wear sensor (12), and a fault is inferred if the air gap of the brake falls below a predetermined lower threshold value (39) or the detected air gap exceeds a predetermined upper threshold value (38). The invention additionally relates to a brake system comprising monitoring electronics for implementing the method and also a motor vehicle comprising a brake system of this type. To improve the reliability of a monitoring of the air gap of a brake at the lowest expense possible, the following steps are provided according to the invention: detecting a reference position value (25) of the brake wear sensor (12) during unbraked travel; determining (26) multiple value pairs (20) of discrete position values (23) and a current brake pressure P at the same time during braking (24); detecting (30) a characteristic function (21) interpolating the value pairs (20); determining (32) a characteristic position value (33) according to the characteristic function (21) for a selected brake pressure (35); and determining (36) an actual value (18) of the air gap (8) by subtracting (36) the reference position value (25) from the characteristic position value (33).