| 摘要 |
A method and apparatus for continuous supervision of both a vehicle's speed and deceleration over a track, provides overspeed detection in one set of conditions and under-deceleration detection under other conditions. The apparatus does not provide automatic driving, but is used in conjunction with either automatic driving equipment or manual driving of the vehicle. The process involved comprises the steps of transmitting to the vehicle an exit speed, defined as a speed limit to be observed on leaving a particular block section of the track upon which the vehicle travels. The exit speed is stored in the vehicle, and comparisons are made with a stored exit speed for the preceding block section. The process further includes a continuous measurement of both actual speed and deceleration of the vehicle, and provides for initiation of emergency braking dependent upon the results of the comparison and measurement steps. Specifically, where the present exit speed equals or exceeds the exit speed of the preceding section, emergency braking is initiated subsequent to a predetermined delay where the actual speed exceeds the exit speed for the particular block section. Where the present exit speed is less than the exit speed for the preceding section, emergency braking is initiated when the measured deceleration is less than a predetermined deceleration.
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