US 2003/0114969 A1 · Method for controlling a steer-by-wire system

Abstract

A device for controlling a steer-by-wire steering system in a vehicle is described. The redundantly generated sensor signals (δv1, δv2, δH1, δH2) for regulating a steering motor (LM) and for a feedback actuator (LRM) that transfers the restoring torques from the road to the driver via the steering wheel are received by a control device having the form of a microcomputer (RM) and plausibility checks of the sensor signals are performed therein and in an operatively associated monitoring module (ÜM). Microcomputer module (RM) and monitoring module (ÜM) monitor each other reciprocally. An auxiliary level for the steer-by-wire steering system is also monitored by the control device (RM) which, in the case of error, switches to this auxiliary level or a mechanical auxiliary level. In order to further increase the degree of safety, the steering wheel motor (LRM) is triggered via control signals (UH) for its phase currents and by a steering wheel motor enable signal (gRH), and similarly the steering motor (LM) is triggered via control signals (Uv) for its phase currents and via a steering motor enable signal (gRV). (FIG. 5)

Claims27

Dependent claims

A method of operating a control device for a steer-by-wire steering system of a vehicle,

characterized by the following, at least partially redundantly arranged procedural steps:
acquisition of input signals for steering wheel angles (δH, δH1, δH2), steering angles (δv, δv1, δv2), restoring torque (Mv, Mv1, Mv2) operating on the steered wheels, transfer torque (MH, MH1, MH2) from a feedback actuator (LRM, LRM1, LRM2) to a steering mechanism,
monitoring of the acquired input signals by plausibility checks and/or analytic redundancy;
triggering of at least one of the steering actuators (LM, LMvl, LMvr) operating on the steered wheels of the vehicle, depending on the steering wheel angle (δH);
triggering of at least one feedback actuator (LRM1, LRM2) operating on a steering wheel, depending on the restoring torque (Mv, Mv1, Mv2);
communication with other control devices or sensors (10, 13, 14) in the vehicle;
monitoring the control device functions and the availability of an auxiliary level and of an arrangement (KU, USV) for activating the auxiliary level;
switching from the steer-by-wire steering to the auxiliary level upon the occurrence of an error in the steer-by-wire steering.

5 more elements

Dependencies are inferred from the claim text.

Method for controlling a steer-by-wire system

Life of this patent

Method for controlling a steer-by-wire system

Life of this patent

Abstract

Claims27