Measuring and testing – Internal combustion engine or related engine system or... – Fuel system or part thereof
Reexamination Certificate
2006-03-22
2010-12-07
McCall, Eric S (Department: 2855)
Measuring and testing
Internal combustion engine or related engine system or...
Fuel system or part thereof
C073S114510
Reexamination Certificate
active
07845216
ABSTRACT:
A gaseous fuel injector3supplies gaseous fuel from a compressed gas cylinder1into a measuring portion thin tube5and pressure change in the tube is measured by a pressure measuring device4through a small hole provided in the thin tube5. An extension thin tube6for removing the influence of reflected waves is provided on the downstream side of the measuring portion thin tube5. There is provided at the downstream side end of the extension thin tube a back pressure valve13for 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 tube5. Pressure measured by the pressure measuring device4is 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.
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European Search Report for corresponding European application 06730318.0-1234 lists the references above.
Araki Mikiya
Fujiwara Yasuhiro
Ishima Tsuneaki
Nakamura Hisao
Obokata Tomio
Hogan & Lovells US LLP
McCall Eric S
National University Corporation Gunma University
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