Apparatus for detecting friction in a power steering system
First Claim
Patent Images
1. A steering system comprising:
- a steering gear;
a sensor operative to measure acceleration of the steering gear during a change in the steering angle and to generate a sensor signal representing structure-borne noise associated with said steering gear; and
a control unit operative to compare the sensor signal with a threshold value and to detect a fault state if the sensor signal is larger than the threshold value.
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Abstract
A power steering system including a sensor arranged or located in the steering system. The sensor detects an acoustic vibration or an acceleration signal in the steering system during a change in the steering angle and generates a sensor signal representing the vibration or the acceleration signal. A control unit receives the sensor signal and compares the sensor signal with a threshold value to detect a fault state; for example when the sensor signal is larger than the threshold value.
11 Citations
20 Claims
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1. A steering system comprising:
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a steering gear; a sensor operative to measure acceleration of the steering gear during a change in the steering angle and to generate a sensor signal representing structure-borne noise associated with said steering gear; and a control unit operative to compare the sensor signal with a threshold value and to detect a fault state if the sensor signal is larger than the threshold value. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10)
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11. A steering system comprising:
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a steering gear; a sensor operative to measure acoustics of the steering gear during a change in the steering angle and to generate a sensor signal representing airborne noise associated with said steering gear; a control unit operative to compare the sensor signal with a threshold value and to detect a fault state if the sensor signal is larger than the threshold value; an electric auxiliary motor connected to steering gear; and said control unit operative to deactivate said electric auxiliary motor upon detection of a fault state. - View Dependent Claims (12, 13, 14)
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15. A steering system comprising:
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a steering gear; a sensor operative to detect vibration in the steering gear generated by friction during a change in the steering angle and to generate a signal representing the vibration; and a control unit operative to compare the sensor signal with a threshold value and to detect a fault state if the sensor signal is larger than the threshold value. - View Dependent Claims (16, 17)
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18. A method for detecting friction in a steering system comprising the steps of:
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providing a steering gear; detecting vibration in the steering gear generated by friction during a change in the steering angle and generating a signal representing the vibration; comparing the signal with a threshold value and generating a fault state if the signal is greater than the threshold value. - View Dependent Claims (19, 20)
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Specification