Electromechanical power steering system and method for operating an electromechanical power steering system

摘要

Electromechanical servo steering system for a motor vehicle, comprising a manual torque sensor (4), at least one manual steering angle sensor (5), a control device (12), a servomotor (9), a fault monitor (65) and an auxiliary circuit (60), whereby the manual torque sensor (4) and the hand steering angle sensor (5) an input signal from a driver is measured and the control unit (12) calculates a setpoint signal (S) for the servomotor (9) from the input signal, with the error monitoring (65) checking the correct operation of the hand torque sensor (4 ) monitored and, in the event of a fault, a control signal (SS) is generated at the output of the auxiliary circuit (60), which is fed to the servomotor (9), the control signal (SS) generating an emergency running assist torque that is independent of the output signal of the torque sensor (4) characterized in that the emergency assist torque is dependent at least on a steering angle speed and / or a temperature of the steering system.