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US4132379A
Expired / Lapsed
US
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Method for improving the stopping accuracy at railway stations of track-bound vehicles
Assignee: Alcatel Lucent NV
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Filing: 1977-10-26
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Granted: 1979-01-02
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Expires: 1997-10-26
Abstract
Abstract Improved stopping accuracy of track-bound vehicles at railway stations is obtained by spacing the phase reversal points of the track conductors at shorter intervals in the station area than on the line and, during a vehicle's approach to a stop, transmitting the exact location of the stopping point between any two phase reversal points to the vehicle, and activating the vehicle's own phase reversal detection logic for the duration of its stay in the station area.
Inventors
- 👤 Jorg Schwarzwalder
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 06:01
CPC Classifications
B; B61; B61L; B61L3/00; B61L3/16; B61L3/22; B61L3/225
Claims Analysis
Total Claims: 3
Claim 1
Independent Claim
164 words
In a method for improving the stopping accuracy at railway stations of track-bound vehicles to which a fixed control center transmits data telegrams over continuous track conductors and in which said vehicles determine their location by counting phase reversal points of said continuous track conductors, said phase reversal points being counted only within a window formed by activating a phase-reversal-point-detecting switching logic in the immediate vicinity of said phase reversal points, the improvement comprising the steps of: spacing a plurality of said phase reversal points in an area of said stations at much shorter and substantially equal intervals than those of said phase reversal points remote from said area of said stations, and during the approach of a vehicle to a station stop, transmitting to said vehicle a special message giving the exact location of a stopping point between two adjacent ones of said phase reversal points in said area of said stations, said message causing said switching logic to be permanently switched "on".
Claim 2
Dependent Claim
164 words
In a method for improving the stopping accuracy at railway stations of track-bound vehicles to which a fixed control center transmits data telegrams over continuous track conductors and in which said vehicles determine their location by counting phase reversal points of said continuous track conductors, said phase reversal points being counted only within a window formed by activating a phase-reversal-point-detecting switching logic in the immediate vicinity of said phase reversal points, the improvement comprising the steps of: spacing a plurality of said phase reversal points in an area of said stations at much shorter and substantially equal intervals than those of said phase reversal points remote from said area of said stations, and during the approach of a vehicle to a station stop, transmitting to said vehicle a special message giving the exact location of a stopping point between two adjacent ones of said phase reversal points in said area of said stations, said message causing said switching logic to be permanently switched "on".
Claim 3
Dependent Claim
29 words
The method of claim 1, comprising further the step of: locating any necessary transitions between adjacent ones of said phase-reversal points in said shorter interval of phase reversal points.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1982-01-01 | 1982-07-03 | 1983-01-02 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1986-01-01 | 1986-07-03 | 1987-01-02 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1990-01-01 | 1990-07-03 | 1991-01-02 | $7700.00 | Window Closed / Lapsed |