Title:
【発明の名称】鉄道信号システム
Document Type and Number:
Japanese Patent JP2720107
Kind Code:
B2
Abstract:
PCT No. PCT/GB90/01766 Sec. 371 Date Apr. 29, 1992 Sec. 102(e) Date Apr. 29, 1992 PCT Filed Nov. 16, 1990 PCT Pub. No. WO91/07302 PCT Pub. Date May 30, 1991.A railway signalling system for the detection of a train within a defined section of track by means of track circuit apparatus utilizes the rails within the section as part of the track circuit. The rails are electrically shunted by the wheels and axles of a railway vehicle of the train in the section. The presence of a train is detected by detecting the change in the shunt impedance between the rails of the track circuit when a train enters the section. To improve the reliability of the track circuit a shunt assist circuit is provided. This shunt assist circuit comprises an inductive loop aerial provided on the railway vehicle so that it is closely coupled, inductively, with the rails, whereby when the loop aerial is energized from an alternating source, a current is induced in the wheel-rail-axle circuit.
Inventors:
Cribbens, Alan Hugh
Sutton, Marcolm Stuart
Sutton, Marcolm Stuart
Application Number:
JP50019090A
Publication Date:
February 25, 1998
Filing Date:
November 16, 1990
Export Citation:
Assignee:
British Railways Board
International Classes:
B61L3/12; B61L1/18; B61L25/02; (IPC1-7): B61L1/18
Domestic Patent References:
| JP5682663A | ||||
| JP56145701A | ||||
| JP6247469U | ||||
| JP6278563U |
Other References:
【文献】米国特許2817012(US,A)
【文献】米国特許4041448(US,A)
【文献】独国公告2332483(DE,B2)
【文献】米国特許4041448(US,A)
【文献】独国公告2332483(DE,B2)
Attorney, Agent or Firm:
Akasaka Saka (1 person outside)