Brake control system for supplementing electric brake with friction brake
First Claim
1. A brake control system for a railway car including means for providing a brake command signal, an electric brake, first signal receiving means for connecting said brake command signal to said electric brake and for providing a first supplementary brake command signal when a feedback signal corresponding to the effectiveness of said electric brake is less than said brake command signal, and friction brake means for supplementing said electric brake, comprising:
- (a) second signal receiving means for providing a second supplementary brake command signal corresponding to said brake command signal;
(b) a source of electric power;
(c) circuit means for connecting said source of electric power to said first signal receiving means;
(d) said first signal receiving means including an operational amplifier having an electrical output providing said first supplementary brake command signal in accordance with a difference between said brake command signal and said electric brake feedback signal;
(e) said second signal receiving means including(i) first detector means for providing a first malfunction signal when an anomaly of said power source is detected at said circuit means; and
(ii) second detector means for providing a second malfunction signal when a difference between said brake command signal and sum of said first supplementary brake command signal and said electric brake feedback signal exceeds a predetermined amount; and
(f) switch means for normally connecting said first supplementary brake command signal to said friction brake means, and for connecting said second supplementary brake command signal to said friction brake means, when either one or both of said first and second malfunction signals exist.
4 Assignments
0 Petitions
Accused Products
Abstract
A brake control system for a railway car having a primary electric brake and a secondary friction brake that supplements the electric brake as the electric brake effectiveness fades. The secondary friction brake is normally applied in accordance with a first supplementary control signal provided by an electrical component, such as an operational amplifier, the output of which is the difference between a brake command signal and the actual braking produced by the electric brake. A second supplementary control signal corresponding to the brake command signal is effective to control the secondary friction brake, in response to either anomalies in the power supply or failure of the operational amplifier. A switch connects the brake command signal to an electric-pneumatic converter to provide pneumatic pressure to the friction brake corresponding to the brake command, and to concurrently terminate operation of the electric brake, when either one or both of the foregoing abnormalities are detected.
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Citations
17 Claims
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1. A brake control system for a railway car including means for providing a brake command signal, an electric brake, first signal receiving means for connecting said brake command signal to said electric brake and for providing a first supplementary brake command signal when a feedback signal corresponding to the effectiveness of said electric brake is less than said brake command signal, and friction brake means for supplementing said electric brake, comprising:
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(a) second signal receiving means for providing a second supplementary brake command signal corresponding to said brake command signal; (b) a source of electric power; (c) circuit means for connecting said source of electric power to said first signal receiving means; (d) said first signal receiving means including an operational amplifier having an electrical output providing said first supplementary brake command signal in accordance with a difference between said brake command signal and said electric brake feedback signal; (e) said second signal receiving means including (i) first detector means for providing a first malfunction signal when an anomaly of said power source is detected at said circuit means; and (ii) second detector means for providing a second malfunction signal when a difference between said brake command signal and sum of said first supplementary brake command signal and said electric brake feedback signal exceeds a predetermined amount; and (f) switch means for normally connecting said first supplementary brake command signal to said friction brake means, and for connecting said second supplementary brake command signal to said friction brake means, when either one or both of said first and second malfunction signals exist. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17)
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Specification