Positive signal comparator and method
US6957131B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Nov 21, 2002 |
| Grant date | Oct 18, 2005 |
| Priority date | — |
| Expiry date | Dec 4, 2022 |
Classification
- Technology area (CPC B)Performing Operations; Transporting
- CPC primaryB61L2205/04
- WIPO fieldTransport
- WIPO sectorMechanical engineering
Abstract
A positive signal comparator system includes a transceiver located on a train for transmitting an interrogation signal to a wayside signal device and receiving a response signal from the wayside signal device, an input device through which an operator enters a signal in response to the signal received from the wayside signal device, and a controller including a signal comparator for determining if the signal input by the operator matches the signal received from the wayside signal device and taking corrective action if the operator fails to enter the proper signal. In some embodiments, the corrective action comprises activating a warning device and/or activating the train's brakes. In some embodiments, the invention further comprises a display for displaying the signal received from the wayside signal generator to the operator.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.