HANDS ON STEERING WHEEL DETECT IN LANE CENTERING OPERATION
First Claim
1. A control system to determine a hands on wheel (HOW) condition of a hand wheel, the control system comprising:
- a sensor that monitors an amount of applied torque exerted upon the hand wheel; and
a control module for monitoring the sensor, the control module including;
a notch filter to attenuate a normal column mode frequency from the amount of applied torque to produce a filtered torque signal, the normal column mode frequency configured to represent a range of vibrational modes of the hand wheel based on a hands off wheel condition; and
a state detector to receive the filtered torque signal from the notch filter, the state detector configured to determine if the HOW condition exists based on if the filtered torque signal exceeds an ON threshold torque value.
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Accused Products
Abstract
A control system to determine a hands on wheel (HOW) condition is provided. The control system includes a sensor that monitors an amount of applied torque exerted upon a hand wheel, and a control module for monitoring the sensor. The control module includes a notch filter to attenuate a normal column mode frequency from the amount of applied torque to produce a filtered torque signal. The normal column mode frequency represents a range of vibrational modes of the hand wheel based on a hands off wheel condition. The control module includes a state detector to receive the filtered torque signal from the notch filter. The state detector determines if the HOW condition exists based on if the filtered torque signal exceeds an ON threshold torque value.
61 Citations
20 Claims
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1. A control system to determine a hands on wheel (HOW) condition of a hand wheel, the control system comprising:
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a sensor that monitors an amount of applied torque exerted upon the hand wheel; and a control module for monitoring the sensor, the control module including; a notch filter to attenuate a normal column mode frequency from the amount of applied torque to produce a filtered torque signal, the normal column mode frequency configured to represent a range of vibrational modes of the hand wheel based on a hands off wheel condition; and a state detector to receive the filtered torque signal from the notch filter, the state detector configured to determine if the HOW condition exists based on if the filtered torque signal exceeds an ON threshold torque value. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9)
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10. A method of determining a hands on wheel (HOW) condition of a hand wheel, the method comprising:
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monitoring a sensor for an amount of applied torque exerted upon the hand wheel by a control module; attenuating a normal column mode frequency from the amount of applied torque to produce a filtered torque signal by a notch filter of the control module, the normal column mode frequency configured to represent a range of vibrational modes of the hand wheel based on a hands off wheel condition; receiving the filtered torque signal by a state detector of the control module; and determining if the HOW condition exists by the state detector, the determining based on comparing the filtered torque signal with an ON threshold torque value. - View Dependent Claims (11, 12, 13, 14, 15, 16, 17)
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18. A control system to determine a hands on wheel (HOW) condition of a hand wheel, the control system comprising:
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a sensor that monitors an amount of applied torque exerted upon the hand wheel; and a control module for monitoring the sensor, the control module including; a bandpass filter module to receive the amount of applied torque and producing at least two passbands based on the amount of applied torque, the at least two passbands falling within the normal column mode frequency, the normal column mode frequency representing a range of vibrational modes of the hand wheel based on a hands off wheel condition; a dominant band block configured to determine a dominant frequency based on the at least two passbands; and a HOW detector module to compare the dominant frequency to a representative frequency for determining if the HOW condition exists, the representative frequency being a range of frequencies of the hand wheel if the HOW condition exists. - View Dependent Claims (19, 20)
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Specification