IPC분류정보
국가/구분 |
United States(US) Patent
등록
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국제특허분류(IPC7판) |
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출원번호 |
US-0581369
(1975-05-27)
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발명자
/ 주소 |
- Grundy Reed H. (Murrysville PA)
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출원인 / 주소 |
- Westinghouse Air Brake Company (Swissvale PA 02)
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인용정보 |
피인용 횟수 :
60 인용 특허 :
0 |
초록
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Train speed is controlled by propulsion train line (PTL) apparatus, which sets a base level of propulsion effort, and by an advance train line (ATL) apparatus, which varies the propulsion effort up or down from the existing base level in accordance with under or over speed conditions. Each full cycl
Train speed is controlled by propulsion train line (PTL) apparatus, which sets a base level of propulsion effort, and by an advance train line (ATL) apparatus, which varies the propulsion effort up or down from the existing base level in accordance with under or over speed conditions. Each full cycle of ATL operation drives the PTL apparatus to the next higher or lower base level. A propulsion error signal PE drives a comparator-clock network to generate clock pulses and an up/down signal to step the ATL register and thus the PTL encoder to bring speed within the desired range. A speed control, brake error signal SCBE controls normal train braking effort but is inhibited while propulsion control remains effective to reduce speed. When the PTL encoder counts down to the zero propulsion level, the clamp on signal SCBE is removed to activate braking to further reduce speed. Station stops are controlled by a first trigger signal a preset distance in approach to the station and two subsequent triggers at shorter distances to improve the accuracy of the stop. Each trigger signal applies a scaled value of train speed and a distance-to-go indication to an acceleration computer which continually computes the deceleration rate required to stop at the station. When a comparison of the computed deceleration rate with a desired rate results in a preset ratio, the PTL encoder is driven down to zero to reduce speed in preparation for the station stopping action.
대표청구항
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A station stop and speed regulation system for a train, each car of which is equipped with braking control means interconnected for common operation of brakes throughout the train, and with variable propulsion control means capable of providing a plurality of propulsion effort conditions, comprising
A station stop and speed regulation system for a train, each car of which is equipped with braking control means interconnected for common operation of brakes throughout the train, and with variable propulsion control means capable of providing a plurality of propulsion effort conditions, comprising in combination, a. a desired velocity source for supplying a desired speed signal, b. a train speed measuring means coupled for measuring velocity of the train and for generating separate signals representing actual train speed and actual train acceleration, i. said measuring means also supplying pulses, each representing a unit of distance traveled by that train, c. a speed and brake regulating means coupled for receiving said desired speed, actual speed, and actual acceleration signals, and responsive to the difference between said desired and actual speed signals for generating a series of first clock pulses in accordance with the magnitude of said difference and an error direction signal having a first or a second condition as said actual speed is less than or more than said desired speed, respectively, i. said speed and brake regulating means further responsive to said difference for generating a brake error signal to jointly actuate said braking control means, said brake error signal normally inhibited from execution while a propulsion effort exists, d. an advance train line register means connected for receiving said series of first clock pulses and said direction signal and responsive thereto for varying the propulsion level of the train by preselected steps including a preselected number of cars less than the total cars in the train, one step for each clock pulse, increasing or decreasing from the train base propulsion level as said direction signal is in said first or second condition, respectively, i. said advance train line register means resPonsive to the completion of each full train cycle of propulsion variation for generating a second clock pulse, e. a propulsion train line encoder means coupled for receiving second clock pulses and said direction signal and responsive thereto for establishing a new base propulsion level for the train upon reception of each second clock pulse, increased or decreased from the former base level in accordance with the first or second condition of said direction signal, i. said propulsion train line encoder means connected, when in its zero count condition during a count-down action, for removing the inhibiting clamp on said braking error signal to actuate a train braking action and for resetting said advance train line register means, f. a trigger detection means responsive to passage by a station stop actuating device, positioned along the track wayside a predetermined distance in approach to a station stop location, for registering a station stop trigger signal, g. an acceleration computer means, connected to said trigger detection means and to said speed measuring means, responsive to said trigger signal, said distance traveled pulses, and actual train speed signal for computing a signal representing the deceleration rate required to stop that train at said station stop location, and further coupled to supply the required deceleration signal to said speed and brake regulating means, h. a source of a desired acceleration/deceleration rate signal, coupled to supply that signal to said speed and brake regulating means, i. said speed and brake regulating means responsive to said desired deceleration signal and said required deceleration signal in a preset ratio for driving said propulsion train line encoder means to the lowest propulsion level for that train, j. said speed and brake regulating means also responsive to said desired and required deceleration signals when equal for interrupting the normal speed control of the train braking control means and for actuating a train braking action at said desired deceleration rate until that train has stopped at said station stop location.
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