| 摘要 |
First and second up-down counters are provided to operate in response to the steering movements of a motor vehicle. The first up-down counter operates as an up-counter while the steering wheel is rotated clockwise to increase its count by unit steps and operates as a down-counter while the steering wheel is rotated counterclockwise decreasing the count by unit steps to zero. The second up-down counter operates as an up-counter while the steering wheel is rotated counterclockwise and as a down-counter while the steering wheel is rotated clockwise. The content of each counter represents the relative angular displacement of the steering wheel. When a predetermined count is reached in each of the counters, an output is provided to indicate that the steering wheel has rotated a predetermined relative amount of angular displacement and the counters are cleared for subsequent counting operations.
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