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:
Jun. 25, 2002
Filed:
Nov. 20, 2000
Kunihito Sato, Yokohama, JP;
Tokyu Car Corporation, Kanagawa, JP;
Abstract
During traveling of rolling stock on a route, running velocity of the rolling stock is detected. Vertical acceleration is also detected at a carbody above spring rigging of truck and a component is extracted in a predetermined frequency range from the vertical acceleration. When an absolute value of the vertical acceleration in the frequency range exceeds preset limit vertical acceleration corresponding to running velocity, the rolling stock is judged as being derailed. In another embodiment double integral of the vertical acceleration is carried out every predetermined evaluating time to calculate a vertical displacement amount. In the case that the vertical displacement amount is negative and an absolute value thereof is not less than a predetermined reference value, it is then determined that the rolling-stock is derailed.