Controlling a steer-by-wire steering system
AssigneesThyssenkrupp Presta AG, thyssenkrupp AG
InventorKristof POLMANS
Life of this patent
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Abstract
A vehicle steering system includes a steering actuator which acts on steered wheels, an actuation unit, a feedback actuator to which a user request for a steering angle can be applied using a steering input means, which outputs a feedback signal to the steering input means in response to the request and a driving state of the vehicle. A signal transmission transfers the request to the actuation unit. The actuation unit actuates the steering actuator to deflect the wheels. When a monitor detects a malfunction of the feedback actuator as a fault situation, the feedback signal and the signal transmission is modified or generated according to multiple options.
Claims10
-9. (canceled)
A steer-by-wire steering system for a motor vehicle, comprising:
- an electronically controllable steering actuator configured to act on steered wheels of the vehicle,
- an actuation unit,
- a feedback actuator configured such that a user request for a steering angle from a steering input means outputs a feedback signal to the steering input means as a reaction to the request and a driving state of the motor vehicle,
- a signal transmission configured to transfer the request to the actuation unit,
- wherein the actuation unit is configured to actuate the steering actuator to transform the request into a deflection of the steered wheels, and
- a feedback actuator monitor unit configured to detect a malfunction of the feedback actuator as a fault situation,
- wherein the system is configured to operate in the fault situation according to the following method:
- continuously reducing to zero the feedback signal to the steering input means within a first time period, and
- one or more of:
- reducing the signal transmission, and
- interrupting the signal transmission for a second time period, and
- only including the request which is transferred in the signal transmission as a reduced variable in the transformation for determining the change in the deflection of the wheels, and
- omitting the request which is transferred in the signal transmission, for the second time period, from the transformation for determining the change in the deflection of the wheels.
A steer-by-wire steering system for a motor vehicle, comprising:
- an electronically controllable steering actuator configured to act on steered wheels of the motor vehicle,
- an actuation unit,
- a feedback actuator configured such that a user request for a steering angle can be applied by a user using a steering input means, and which outputs a feedback signal to the steering input means as a reaction to the request and a driving state of the motor vehicle,
- a signal transmission device configured to transfer the request to the actuation unit,
- wherein the actuation unit is configured to actuate the steering actuator in order to transform the request into a deflection of the steered wheels,
- wherein a feedback actuator monitor unit configured to monitor the feedback actuator and detect a malfunction of the feedback actuator as a fault situation,
- wherein the feedback actuator monitor unit is configured to reduce, in the fault situation, the feedback signal to the steering input means continuously to zero within a first time period, and one or more of:
- reduce the signal transmission between the steering input means and the steering actuator, and
- interrupt the signal transmission for a second time period, and
- transmit the driver's request, transferred in the signal transmission, only as a reduced variable, and
- transmit the driver's request, transferred in the signal transmission, into the transformation for determining the change in the deflection of the wheels in the actuation unit.
Dependencies are inferred from the claim text.