Patent US3794977A successfully refreshed from Google Patents.
US3794977A
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A multiplex control system for controlling the operation of a plurality of stations
Assignee: Bombardier Transportation Holdings USA Inc
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Filing: 1971-03-11
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Granted: 1974-02-26
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Expires: 1991-03-11
Abstract
Abstract A train control signalling system is provided for train speed command signals and train position detection signals which system is operative in a fail-safe manner with a plurality of isolated track circuit blocks. For a given train system, a plurality of wayside stations is provided, with each station being operative through a limited number of conductors to energize a predetermined number of track circuit blocks. Each station includes a crystal controlled signal generator to assure an accurate coherent base frequency control of the communicated signals and provide control signals for the signal communication operation relative to each station to thereby control, in effect as an extension of the crystal control concept, accuracy to each of the associated track circuit blocks. Up to 32 separated track circuit block locations receive information from each wayside station, for this particular system as described, over a common time division multiplexed signalling system, so it is necessary that each location receive its particular information only at the correct time period. This is accomplished by an appropriate control signal sent for this purpose to each track circuit block location.
Inventors
- 👤 Booth G Thorne
- 👤 R Hoyler
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 13:02
CPC Classifications
B; B61; B61L; B61L3/00; B61L3/16; B61L3/22; B61L3/24; B61L3/246
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
200 words
In a multiplex system for controlling the operation of a plurality of stations, the combination comprising: a first signal means for providing in sequence a plurality of multiple bit digital information signals and a multiple bit digital control signal to each of said plurality of stations for controlling the operation of same, with a given bit in each of said information signals being intended for a given station; a second signal means located at each of said plurality of stations for successively sensing one predetermined bit in each one of said plurality of multiple bit information signals at a given time during each information signal sequence determined by the provision of a predetermined number of bits of said multiple bit digital control signal; comparator means for determining the operational status of said given station by comparing said given bit intended for said given station in each one of said plurality of multiple bit digital information signals with each said one predetermined bit which is successively sensed by said second signal means at said given station; and means for modifying the sequence of digital information bits intended for said given station in response to the comparison of bits not being identical.
Claim 2
Dependent Claim
200 words
In a multiplex system for controlling the operation of a plurality of stations, the combination comprising: a first signal means for providing in sequence a plurality of multiple bit digital information signals and a multiple bit digital control signal to each of said plurality of stations for controlling the operation of same, with a given bit in each of said information signals being intended for a given station; a second signal means located at each of said plurality of stations for successively sensing one predetermined bit in each one of said plurality of multiple bit information signals at a given time during each information signal sequence determined by the provision of a predetermined number of bits of said multiple bit digital control signal; comparator means for determining the operational status of said given station by comparing said given bit intended for said given station in each one of said plurality of multiple bit digital information signals with each said one predetermined bit which is successively sensed by said second signal means at said given station; and means for modifying the sequence of digital information bits intended for said given station in response to the comparison of bits not being identical.
Claim 3
Dependent Claim
60 words
The combination claimed in claim 1, with said second signal means including a counter which counts in response to the provision of said multiple bit digital control signal; and means for sensing the provision of said one predetermined bit in each one of said plurality of multiple bit information signals in response to said counter counting to a predetermined count.
Claim 4
Dependent Claim
234 words
In a multiplex system for controlling the operation of a plurality of remote stations, the combination comprising: means for providing in sequence a plurality of N bit, where N is an integer, digital information signals to each of said plurality of remote stations for controlling the operation of same, with at least a given one of the bits in each one of said bit information signals being intended for a given station; means for providing an M bit, where M is an integer, digital control signal to each of said plurality of remote stations; means for sensing at said given station, the provision of said given one of said N digital information bits in each one of said plurality of digital information signals at a given time during each information signal sequence determined by the provision of a predetermined one of said M digital control bits to said given station; comparator means for determining the operational status of said given station by comparing said given one of the bits in each one of said N digItal information signals intended for said given station with the bit sensed, during each successive information signal sequence, by said means for sensing at said given station; and means for modifying the sequence of digital information bits intended for said given station in response to the comparison of bits not being identical on a bit by bit comparison basis.
Claim 5
Dependent Claim
234 words
In a multiplex system for controlling the operation of a plurality of remote stations, the combination comprising: means for providing in sequence a plurality of N bit, where N is an integer, digital information signals to each of said plurality of remote stations for controlling the operation of same, with at least a given one of the bits in each one of said bit information signals being intended for a given station; means for providing an M bit, where M is an integer, digital control signal to each of said plurality of remote stations; means for sensing at said given station, the provision of said given one of said N digital information bits in each one of said plurality of digital information signals at a given time during each information signal sequence determined by the provision of a predetermined one of said M digital control bits to said given station; comparator means for determining the operational status of said given station by comparing said given one of the bits in each one of said N digItal information signals intended for said given station with the bit sensed, during each successive information signal sequence, by said means for sensing at said given station; and means for modifying the sequence of digital information bits intended for said given station in response to the comparison of bits not being identical on a bit by bit comparison basis.
Claim 6
Dependent Claim
243 words
In a multiplex system for controlling the operation of a plurality of remote stations, the combination comprising: means for sequentially providing a plurality of N bit, where N is an integer, digital information signals to each of said plurality of remote stations for controlling the operation of same, with a given one of the bits in each one of said N bit information signals being intended for a given station; means for providing an M bit time, where M is an integer, digital control signal to each of said plurality of remote stations; a counter at each station for counting in response to the provision of said digital control signal; means at each station for providing a timing signal in response to said counter reaching a predetermined count; means at each station for sensing a predetermined one of said N digital information bits in each digital information signal sequence in response to the provision of said timing signal; comparator means for determining the operational status of said given station by comparing said given bit intended for said given station in each one of the digital information signals with each said predetermined one of said N digital information bits which is successively sensed by said means for sensing at said given station; and means for modifying the sequence of digital information bits intended for said given station in response to the comparison of bits not being indentical on a bit by bit comparison basis.
Claim 7
Dependent Claim
243 words
In a multiplex system for controlling the operation of a plurality of remote stations, the combination comprising: means for sequentially providing a plurality of N bit, where N is an integer, digital information signals to each of said plurality of remote stations for controlling the operation of same, with a given one of the bits in each one of said N bit information signals being intended for a given station; means for providing an M bit time, where M is an integer, digital control signal to each of said plurality of remote stations; a counter at each station for counting in response to the provision of said digital control signal; means at each station for providing a timing signal in response to said counter reaching a predetermined count; means at each station for sensing a predetermined one of said N digital information bits in each digital information signal sequence in response to the provision of said timing signal; comparator means for determining the operational status of said given station by comparing said given bit intended for said given station in each one of the digital information signals with each said predetermined one of said N digital information bits which is successively sensed by said means for sensing at said given station; and means for modifying the sequence of digital information bits intended for said given station in response to the comparison of bits not being indentical on a bit by bit comparison basis.
Claim 8
Dependent Claim
20 words
The combination claimed in claim 4 with said N bit signal information signal being coded in a comma free code.
Claim 9
Dependent Claim
22 words
The combination claimed in claim 5 with means for resetting each counter during the Mth bit time of said digital control signal.
Claim 10
Dependent Claim
27 words
The combination claimed in claim 6 including means for determining said operational status of a given station during the Mth bit time of said digital control signal.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1977-02-25 | 1977-08-27 | 1978-02-26 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-02-25 | 1981-08-27 | 1982-02-26 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-02-25 | 1985-08-27 | 1986-02-26 | $7700.00 | Window Closed / Lapsed |