Method and apparatus for analyzing performance of electric-traction-motor powered vehicles and electrical operating components thereof
System controlling apparatus which compares signals from sensors monitoring passing objects with pre-determined parameter information to control the system
Automated road transportation system
ApplicationNo. 882263 filed on 06/25/1997
US Classes:246/202, Electric or magnetic246/249, Electric or magnetic246/293, Highway crossing324/207.13, Having particular sensor means340/941Inductive
ExaminersPrimary: Morano, S. Joseph
International ClassB61L 003/00
AbstractA passive magnetic detector is provided at ground level or buried below ground level in between rails of a railroad trace at a distance from the level crossing for detecting magnetic field disturbances caused by ferromagnetic objects passing overhead on the track. Magnetic field reversals are detected in the passive detector signal. The reversal signal is analyzed and a train presence output signal is generated for controlling a level crossing gate system or other such crossing warning system. For parallel tracks, pairs of passive magnetic field detectors detect objects over each track and the reversals are analyzed to check that an inbound train does not sneak by undetected as an outbound train is leaving and passing over the same detector pair. At the level crossing, static magnetic field detectors are used to ensure that no equipment remains on the island after detecting that the moving train has left the crossing, so that the crossing gates can be safely lifted as soon as possible.