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:
Sep. 29, 2009
Filed:
Aug. 23, 2005
Takeki Nogami, Takamatsu, JP;
Shigeya Yamaguchi, Takamatsu, JP;
Takeki Nogami, Takamatsu, JP;
Shigeya Yamaguchi, Takamatsu, JP;
Shikoku Research Institute, Kagawa, JP;
Abstract
The invention diagnoses an electrically operated valve, which is provided with a spring cartridge expanding and contracting in response to a reaction force acting on an axial direction of a worm in a valve element driving section, at both the opening and closing operations of the valve. A correlation between a driving force output signal from the valve element driving section and a driving force from a compression state of the spring cartridge is provided in a database. Then, a correlation between a driving force input signal to the valve element driving section and the driving force output signal is acquired in order to monitor a change in transmission efficiency of the driving force. Then, a driving force corresponding to a measured yoke stress is read out from the database for use in diagnosing the driving force of the electrically operated valve is diagnosed.