Steer-by-wire steering system changes to demand value for second sensor, via intermediate value between last permissible first sensor value and second sensor value if fault in first sensor

摘要

The system has a steering control, a steering angle demand generator actuated by the control with 2 angle sensors, a steered wheel servo drive, a steering angle actual value sensor and a controller that actuates the drive depending on an actual-demand angle comparison, monitors the steering angle sensors and operates redundantly with their values. If the first sensor fails the controller changes to the second demand value, via an intermediate value. The system has a steering control (2), e.g. a steering wheel, a steering angle demand generator (44) actuated by the control with first and second angle sensors (4,5), a servo drive (21) for steered wheels (25,26), a steering angle actual value sensor (42) actuated by the steered wheels and a controller (8) that actuates the drive depending on an actual-demand angle comparison and monitors the steering angle sensors and operates redundantly with their values. If the first steering angle sensor fails the controller changes over to the demand value for the second sensor, via an intermediate value between the last permissible value from the first sensor and the value for the second sensor.