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:
Nov. 29, 2011
Filed:
May. 05, 2009
Jeffrey H. Golowner, Great Neck, NY (US);
Gerhard F. Meyer, Oceanside, NY (US);
Jeffrey H. Golowner, Great Neck, NY (US);
Gerhard F. Meyer, Oceanside, NY (US);
Lockheed Martin Corporation, Bethesda, MD (US);
Abstract
An apparatus and method for train control utilizing virtual lock stepping are disclosed. In accordance with the illustrative embodiment, an improved method of train control utilizes identical software applications executing on redundant processors. The redundant processors are maintained in virtual lock step to ensure the safety integrity of the overall system being controlled. In accordance with the illustrative embodiment, one software process is a master and one software process is a slave. The master and the slave both independently execute application logic based upon detected events (e.g., input data, etc.). In order to ensure that any anomalies that might result in a hazard are detected in the timeliest manner, and that false anomalies are minimized, the redundant software processes must process the same event within a specified time frame.