Malfunction detection arrangement for jerk controlled brake command system
AssigneeNippon Air Brake Co., Ltd.
InventorTatsuo Fujiwara
Life of this patent
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Abstract
A jerk controlled brake system having a malfunction detecting arrangement for suppressing a malfunction signal due to a normal difference between the jerk control circuit input brake command and the output jerk modified command signal for a time period at least sufficient to allow the delayed jerk modified command signal to match the input brake command signal. The timer circuit controlling this time period is resettable prior to expiration of the preset time period to provide an extended time period, when the brake command signal is repeatedly changed at time intervals less than the preset time period.
Claims13
A railway car brake control system comprising:
- (a) brake controller means for providing a brake command signal according to the amount of braking desired;
- (b) first means for modifying said brake command signal to provide a jerk control signal;
- (c) primary brake means operative in response to said jerk control signal for providing smooth application of braking of said railway car;
- (d) difference detector means for providing a difference signal anytime said brake command and said jerk control signals disagree;
- (e) discriminator means subject to said difference signal for providing a malfunction signal;
- (f) change detector means for providing a change signal anytime said brake command signal is varied;
- and
- (g) timer means subject to said change signal for initiating a preset time period each time said brake command signal is varied, during which time period, said discriminator means is prevented from providing said malfunction signal, to thereby distinguish the temporary existence of said difference signal due to normal operation of said jerk control means from said difference signal due to abnormal operation of said jerk control means.
Dependencies are inferred from the claim text.