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:
Dec. 07, 2010
Filed:
Mar. 22, 2006
Mikiya Araki, Gunma, JP;
Seiichi Shiga, Gunma, JP;
Tsuneaki Ishima, Gunma, JP;
Tomio Obokata, Tochigi, JP;
Yasuhiro Fujiwara, Saitama, JP;
Hisao Nakamura, Gunma, JP;
Mikiya Araki, Gunma, JP;
Seiichi Shiga, Gunma, JP;
Tsuneaki Ishima, Gunma, JP;
Tomio Obokata, Tochigi, JP;
Yasuhiro Fujiwara, Saitama, JP;
Hisao Nakamura, Gunma, JP;
National University Corporation Gunma University, Gunma, JP;
Abstract
A gaseous fuel injectorsupplies gaseous fuel from a compressed gas cylinderinto a measuring portion thin tubeand pressure change in the tube is measured by a pressure measuring devicethrough a small hole provided in the thin tube. An extension thin tubefor removing the influence of reflected waves is provided on the downstream side of the measuring portion thin tube. There is provided at the downstream side end of the extension thin tube a back pressure valvefor uniformly increasing the pressure in the tube and for bringing the pressure close to the actual environment in the engine cylinder. Also, a tapered-shape nozzle is arranged in the measuring portion thin tube. Pressure measured by the pressure measuring deviceis transduced into mass flow rate in the thin tube according to a predetermined calculation formula. Accordingly, it is possible to measure instantaneous mass flow rate of gaseous fuel injected from the gaseous fuel injector.