Fail-safe speed control system for railroad trains
阅读：834发布：2022-03-10
专利汇可以提供Fail-safe speed control system for railroad trains专利检索，专利查询，专利分析的服务。并且An improved fail-safe speed control system for railroad trains in which the traffic conditions which establish the permissible speed for a train are determined at a central station in accordance with track occupancy indications transmitted from wayside locations. These indications and return speed command signals are carried over a communication system linking the central station and all wayside locations. To eliminate possible incorrect delivery of proceed speed commands due to communication system faults, restricted speed commands are delivered to wayside locations over direct connections from the central station completed in response to occupied track indications. For additional safety, an occupied track indication is cleared only when an indication is recorded that the corresponding train has moved into the advance track section.，下面是Fail-safe speed control system for railroad trains专利的具体信息内容。
1. In a speed control system for trains moving over a stretch of track divided into sections at preselected wayside locations, each train being equipped for receiving and responding to speed command signals transmitted through the rails of said track, said system including a central control station within said stretch, the combination comprising, a. a track transmitter at each wayside location coupled to said rails for transmitting a distinct speed command signal to control approaching trains and a corresponding signal for train detection into the advance section, b. a track receiver at each wayside location coupled to said rails and responsive only to the detection signal transmitted by the track transmitter at the entrance end of the approach section for recording jointly a section nonoccupied indication and the corresponding speed command signal when a detection signal is received and a section occupied indication when the detection signal is absent, c. a communication system between said central station and each wayside location connected for selectively transmitting speed commands and occupancy indications between said station and said locations, d. a speed command generator at said central location for each wayside location selectively connected to said communication system for transmitting to the corresponding wayside track transmitter a speed command selected in accordance with advance traffic conditions, e. a speed command comparison unit at said central station for each wayside location selectively connected to said communication system for receiving the combined track occupancy and received speed command indication from the corresponding track receiver, 1. each speed command comparison unit also cross connected to the speed command generator for the first wayside location in aPproach for comparing the speed command transmitted to the approach location track transmitter with that received by the corresponding track receiver, f. a safety protection unit at said central station for each track section connected for receiving the occupancy indication from the speed command comparison unit associated with the exit end of the corresponding track section and interconnected with other safety protection units for establishing the advance traffic condition which determines the allowable speed command for a train in the approach section, 1. each speed command comparison unit delivering a nonoccupied indication for the approach track section to the associated safety protection unit when and only when the received speed command indication agrees with the speed command transmitted by the associated speed command generator to the entrance end track transmitter, g. a track relay associated with each safety protection unit and controlled by the associated speed command comparison unit to a first position or a second position as a section nonoccupied or occupied indication, respectively, is supplied to the associated safety protection unit, h. a first circuit at said central station for each track section including a first position contact of the corresponding track relay and interposed in the connections, between said communication system and the entrance end track transmitter, by which the selected speed commands are delivered to that track transmitter, and i. an alternate circuit for each track section including a second position contact of the corresponding track relay and connected for supplying only a restricted speed command direct to the entrance end track transmitter from the associated speed command generator so that a proceed speed command can not be supplied to a following train in the adjoining approach track section.
2. each safety means controlling the speed command generator for the adjoining approach section for selecting the transmitted speed command signal in accordance with the advance traffic condition, f. each speed command comparison unit coupled to the track relay in the associated safety means for operating that relay to its first position only when a section nonoccupied indication is received from the associated detector circuit means and the supplemental speed command signal indication received agrees with the selected speed command transmitted by the speed command generator for the approach track section, g. a first circuit associated with each safety means including a first position contact of the associated track relay and connected for supplying the selected speed command signal transmitted by the speed command generator for the adjoining approach track section to the corresponding speed command signal source, and h. a second circuit associated with each safety means including a second position contact of the associated track relay connected for supplying to the approach section speed command signal source only a restricted speed command signal to be provided to a train occupying the adjoining approach track section when another train is occupying the corresponding track section.
2. each nonoccupied section indication transmitted by a detector track circuit means including a supplemental indication of the speed command signal received from the source common with the adjacent speed command signal circuit means, c. a speed command generator at said central station for each track section connected to said communication system for selectively transmitting a selected speed command signal to control the speed command signal source for the corresponding section, d. a speed command comparison unit at said central station for each track section connected for receiving the section occupancy indications transmitted by the corresponding detector circuit means and when transmitted the supplemental received speed command signal indication,
2. A speed control system as claimed in claim 1, which further includes, a. a stick circuit for each track relay energized by the associated speed command comparison unit while a nonoccupied track indication is continuously recorded, and b. a pickup circuit for each track relay also energized by the associated speed command comparison unit and including a second position contact of the track relay associated with the advance track section, whereby a nonoccupied indication for the associated section after being occupied by a train can not be recorded by a track relay until an occupied indication for the advance track section is recorded.
3. A speed control system for trains traversing a stretch of railroad track which is divided into sections at preset locations, said trains being provided with apparatus responsive to speed command signals applied to the track rails for controlling train speed, said system including a central apparatus station for supervisory control and having associated therewith a communication system linking said central station and all said preset locations, comprising in combination, a. a speed command signal circuit means for each track section for providing through said rails selected speed command signals to trains traversing the section,
4. A speed control system as claimed in claim 3 in which each track relay is provided with, a. a stick circuit means controlled by the associated speed command comparison unit for retaining the relay in its first position while a nonoccupied track indication is continuously received, and b. a pickup circuit means including a second position contact of the track relay for the adjoining advance track section and controlled by the associated speed command comparison unit for restoring the relay to its first position after an occupied track indication has been recorded only when an occupied track indication has subsequently been recorded by said advance section track relay and a nonoccupied track indication is received from the corresponding detector track circuit means.
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