STEUEREINHEIT ZUR LENKUNG DER HINTERRAEDER EINES STRASSENFAHRZEUGES

摘要

An electronic control unit for steering the rear wheels of a road service vehicle comprises: a steering device (LE) controlled, in turn, in an emergency by an emergency steering signal which controls appropriately and in accordance with a chosen concept of emergency operation the steering angle of the rear wheels, for example by returning the steering angle to zero after a delay or by maintaining the most recent steering angle; sensors (SE with Lwr1, Lwr2, ABS, Tach, Ist1, Ist2, St) which record at least the steering angle (Lwr1, Lwr2), the vehicle speed (Tach) and the angle of deflection of the steering wheel (Lw1), or quantities dependent thereon; and a computing unit (P) containing a computer (P1, P2) which receives the sensor signals, and/or signals derived therefrom, in the form of control signals and which in an emergency sends the emergency steering signal to the steering device (LE) in function of a programmed emergency-detecting evaluation of the control signals. The computing unit (P) contains two computers (P1, P2). The control signals are fed to the two computers (P1, P2). Each computer (P1, P2) evaluates the control signals and, in an emergency, immediately emits an emergency steering signal to the steering device (LE), independently of the other computer (P1, P2).