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:
Jul. 27, 1999
Filed:
Mar. 31, 1997
Applicant:
Inventors:
Robert D Dimsa, Elizabeth, PA (US);
Vincent Ferri, Pittsburgh, PA (US);
Assignee:
Westinghouse Air Brake Company, Wilmerding, PA (US);
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
B60T / ;
U.S. Cl.
CPC ...
303 86 ; 303 15 ; 303D / ; 303 20 ; 303 16 ;
Abstract
In a microprocessor-controlled electro-pneumatic brake control system for a railway train, pressure in the brake cylinder is maintained despite the loss of pressure in the '20 pipe' brake line, or failure of a key relay valve that controls pressure to that brake line. Feedback signals derived from the '20 pipe' brake line when found to be inappropriate after a predetermined amount of time are substituted for by brake command signals generated by the brake controller.