Method and apparatus for determining failure of vehicle steering sensing device
First Claim
1. A method of determining a failure of a steering sensing device of a steering shaft mounted on a motor vehicle, comprising the steps of:
- detecting steering angle of the steering shaft from a neutral position by a steering angle sensor;
sensing a steering speed of the steering shaft by means of a steering speed sensor;
calculating a variation with time of the steering angle detected by the steering angle sensor;
comparing the variation with the steering speed; and
determining a failure of at least one of the steering angle sensor and the steering speed sensor when the difference or a ratio between the variation and the steering speed is outside a predetermined range.
1 Assignment
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Accused Products
Abstract
For determining a failure of a steering sensing device of a motor vehicle with a four-wheel steering system wherein rear wheels are also steered responsive to the operation of a steering wheel, there is provided a steering angle sensor for detecting steering angle of the steering shaft and a steering speed sensor for detecting steering speed of the steering shaft. For determining a failure, a calculated value of variation with time of the detected steering angle is compared with the value of the detected steering speed. When the difference between the two values or the ratio of one value to the other value is outside of a predetermined range, it is determined that there is a failure in at least one of the sensors.
23 Citations
5 Claims
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1. A method of determining a failure of a steering sensing device of a steering shaft mounted on a motor vehicle, comprising the steps of:
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detecting steering angle of the steering shaft from a neutral position by a steering angle sensor; sensing a steering speed of the steering shaft by means of a steering speed sensor; calculating a variation with time of the steering angle detected by the steering angle sensor; comparing the variation with the steering speed; and determining a failure of at least one of the steering angle sensor and the steering speed sensor when the difference or a ratio between the variation and the steering speed is outside a predetermined range. - View Dependent Claims (2, 3, 4)
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5. An apparatus for determining a failure of a steering sensing device of a steering shaft mounted on a motor vehicle, comprising:
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a steering angle sensor provided adjacent to the steering shaft for detecting steering angle of the steering shaft from a neutral position; a steering speed sensor provided adjacent to the steering shaft for detecting a value of steering speed of the steering shaft; calculating means for calculating a value of variation with time of the steering angle detected by the steering angle sensor; and comparing means responsive to outputs of said calculating means and said steering speed sensor for comparing the calculated value of the variation and said value of the detected steering speed to determine that at least one of the steering angle sensor and the steering speed sensor is in failure when the difference between the two values or the ratio of one value to the other value is outside a predetermined range.
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Specification