Patent ID: 6244371
Filing Date: 2001-06-12
Classification: B62D

Abstract:
A steering system for a non-track-bound motor vehicle, comprising:a steering handle configured to be actuatable by the driver;a steering actuating drive for steering displacement of steerable vehicle wheels of the vehicle;a desired steering-angle transmitter configured to be actuatable by the steering handle;an actual steering-angle transmitter configured to be actuatable by the steerable vehicle wheels;a regulating and control arrangement configured to control the steering actuating drive as a function of a comparison between a desired value and an actual value of the steering angle and to continuously check itself and sensors interacting therewith for malfunctions; anda mechanical or hydraulic positive coupling arranged between the steering handle and the steerable vehicle wheels and, in normal operation of the regulating and control arrangement, is opened or remains open and, in abnormal condition of the regulating and control arrangement, is automatically closed, wherein the regulating and control arrangement is configured to activate a special state in the event of at least one of a deviation which exceeds a first threshold value occurring between the desired value and the actual value of the steering angle, a deviation which exceeds a second threshold value being maintained between the desired value and the actual value of the steering angle for a specifiable time, and an average value of the desired/actual value deviation of the steering angle exceeding a third threshold value for a second specifiable time.