| 摘要 |
Train acceleration indicating arrangement wherein a sample circuit samples a vehicle velocity signal for a brief interval during each sampling period and produces a sampling signal whose amplitude during each sample period is substantially constant and a function of the sampled velocity signal. Means are provided for algebraically adding an AC signal and the sampling and velocity signals to produce an AC output signal solely during sampling periods when the difference between the sampling and velocity signals exceeds a predetermined magnitude. A relay circuit actuated in response to the AC output signal provides an indication of satisfactory vehicle deceleration. The relay circuit is connected in an emergency circuit of the type applying full service brakes upon detection of an abnormal indication. Actuation of the relay circuit holds off additional actuation of emergency brakes in the event the vehicle decelerates adequately subsequent to detection of an abnormal indication.
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