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. 07, 1998
Filed:
Feb. 21, 1997
Naoki Yamaguchi, Nishinomiya, JP;
Osamu Akamatsu, Akashi, JP;
Westinghouse Air Brake Company, Wilmerding, PA (US);
Abstract
Three-position solenoid valve which outputs an output pressure and can adopt exhaust, overlapping and supply positions. The output pressure is detected by an output pressure sensor and is fed back to a fuzzy control unit. Based on the difference between the output pressure and the command pressure corresponding to the pressure command signal from the brake control unit, such fuzzy control unit calculates a command current value for controlling the three-position solenoid valve by fuzzy reasoning. The command current value can adopt an essentially continuous value, and consequently the three-position solenoid valve can adopt a gentle exhaust state or a gentle supply state. In this way, sudden changes in the output pressure can be suppressed and the output pressure can be made to converge rapidly on the command pressure and eliminate overshoot and undershoot.