HANDS-ON/-OFF DETECTION IN A STEER-BY-WIRE SYSTEM
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Accused Products
Abstract
A steer-by-wire steering system may include a steering adjuster that is electronically controlled depending on driver input, a feedback actuator transmitting feedback from a road, and a control unit that actuates the feedback actuator and the steering adjuster. The control unit comprises an estimator including a monitor and a model of the feedback actuator. The estimator may estimate a driver'"'"'s steering torque based on measurement values of the feedback actuator and with the model and the monitor, then providing the driver'"'"'s steering torque as a result. The control unit further comprises a filter unit that analyzes the measurement values of the feedback actuator by determining the damping of amplitudes of predetermined frequency ranges and to provide the result. The control unit further comprises a decision unit that decides whether a driver'"'"'s hand is in contact with a steering wheel by using the results of the filter unit and the estimator.”
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Citations
26 Claims
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1-13. -13. (canceled)
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14. A steer-by-wire steering system for a motor vehicle, the steer-by-wire steering system comprising:
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a steering adjuster that acts on steered wheels of the motor vehicle and is electronically controlled based on a driver'"'"'s steering demands; a feedback actuator that transmits feedback effects of a road to a control; and a control unit that actuates the feedback actuator and the steering adjuster, the control unit comprising an estimator that has a monitor and a model of the feedback actuator, wherein the estimator estimates a driver'"'"'s steering torque based on measurement values of the feedback actuator and the model and the monitor and provides the driver'"'"'s steering torque as a result, a filter unit that analyzes the measurement values of the feedback actuator by determining damping of amplitudes of predetermined frequency ranges and that provides a result, and a decision unit that decides whether a driver'"'"'s hand is in contact with a steering wheel based on the results of the filter unit and the estimator. - View Dependent Claims (15, 16, 17)
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18. A method for determining a contact state between a driver of a motor vehicle with a steer-by-wire steering system and a steering wheel of the steer-by-wire steering system, wherein the steer-by-wire steering system comprises a steering adjuster that is electronically controlled based on a driver'"'"'s steering demands, a feedback actuator that transmits feedback effects of a road to the steering wheel, and a control unit that actuates the feedback actuator and the steering adjuster, the method comprising:
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determining a frequency spectrum of movement signals detected by sensors of the feedback actuator; analyzing the frequency spectrum by determining damping of amplitudes of predetermined frequency ranges; and estimating a driver'"'"'s steering torque with a monitor of the feedback actuator, a model of the feedback actuator, and the movement signals. - View Dependent Claims (19, 20, 21, 22, 23, 24, 25, 26)
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Specification