Steering system for a motor vehicle
AssigneeRobert Bosch GmbH
InventorsMatthias Hackl, Wolfgang Kraemer
Life of this patent
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Abstract
A steering system for a motor vehicle comprising at least one steered wheel, an actuator motor and an actuator, wherein the steering movement initiated by the driver of the vehicle and the movement initiated by the actuator motor are superimposed by the actuator to generate a movement of the steered wheel. The actuator motor is activated for movement by a manipulated variable that depends at least on the steering movement initiated by the driver. Significant for the invention is that the manipulated variable is limited in magnitude. The difference between the manipulated variable and a restricted manipulated variable in parallel through an integrated stage and is superimposed upon the manipulated variable to prevent the vibration of a released steering wheel.
Claims20
Steering system for a motor vehicle, comprising:
- a steering wheel;
- a steered wheel;
- an actuator motor;
- and an actuator having a plurality of inputs and an output, said steering wheel operatively connected to one of said actuator inputs, said actuator motor operatively connected to another of said actuator inputs, said steered wheel operatively connected to said actuator output, said steered wheel having movement responsive to a steering wheel movement and actuator motor movements, said actuator motor movement responsive to a manipulated variable signal, said manipulated variable signal responsive in part to said steering movement, said manipulated variable limited in magnitude said manipulated variable signal including a superimposed signal, said superimposed signal comprising a difference signal passed through an integrating stage, said difference signal comprising a difference of said manipulated variable signal and a restricted manipulated variable signal.
A method for controlling a steering system, comprising the steps of:
- providing a steering wheel, a steered wheel, an actuator and an actuator motor operatively connected together;
- forming a manipulated variable signal to actuate the movement of the actuator motor, the manipulated variable signal responsive in part to a movement of the steering wheel initiated by a driver, said forming step comprising
- forming a difference signal corresponding to the difference between a manipulated variable signal and a restricted manipulated signal;
- passing the difference signal through an integrating stage to form an integrated difference signal;
- superimposing the integrated difference signal with the manipulated variable signal to form the manipulated variable signal;
- activating the actuator motor in response to the manipulated variable signal;
- and
- using the actuator to apply a steered movement to the steered wheel based on the movement of the steering wheel and the movement of the actuator motor.
Dependencies are inferred from the claim text.