The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Sep. 11, 2007
Filed:
Aug. 16, 2004
Dai Watanabe, Chiyoda-ku, JP;
Kenji Oguma, Chiyoda-ku, JP;
Noriharu Amiya, Chiyoda-ku, JP;
Hitachi, Ltd., Tokyo, JP;
Abstract
In the state that a train moves from a track circuitT toward a track circuitT, and a train detection signal TDis supplied from the boundary between the track circuitsT andT to the track circuitsT andT, and the train detection signal TDis received by the train, if the signal intensity is suddenly reduced greatly immediately after the axle of the train passes the boundary between the track circuitsT andT, it can be decided that the train passes the boundary between the track circuitsT andT. Therefore, if absolute position information of the track circuitT is preserved beforehand in the train, the movement distance calculated from pulse output of a speed generator is corrected (replaced) in the absolute position information of the track circuitT, and hereafter is updated by the pulse output, thus the position of the own train can be easily detected as a movement distance.