| 摘要 |
PURPOSE:To secure such a low-pressure warning system that utilizes a simple wheel speed sensor by installing a signal generator, giving one pulse at each rotation of a wheel, in each wheel, thereby perceiving an angular speed of each wheel for signal processing, and operating the warning system. CONSTITUTION:A pulse generator is installed in each wheel, and the signal is inputted into a central processing unit. Time required for one rotation of a first wheel is measured, and likewise after starting this first time measurement, time required for one rotation of other wheels is recorded over more than three turns on each wheel and averaged. Then, the sum of signals to be secured out of one set on one side being opposed aslant to the wheel is subtracted from the sum of signals of one set on the other, and when a difference comes to the mid value between 0.05 and 0.60 of the mean value of these two sums, such a warning system as displaying a fact that a tire is deflated is operated.
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