Method and apparatus for delivering two fuels to a direct...

Details Method and apparatus for delivering two fuels to a direct... Method and apparatus for delivering two fuels to a direct...

2008-05-20

2008-05-20

Kwon, John T (Department: 3747)

Internal-combustion engines

Charge forming device

Combined liquid and gaseous fuel

C123S0270GE, C123S527000

Reexamination Certificate

active

07373931

ABSTRACT:
An apparatus for delivering two fuels to a direct injection internal combustion engine comprises a liquid-fuel supply rail, a gaseous-fuel supply rail, a drain system with a shared drain rail for collecting both liquid fuel and gaseous fuel, and a venting device for venting gaseous fuel collected by the drain rail. The method comprises separately delivering a liquid fuel at injection pressure to an injection valve through a liquid-fuel rail, and actuating the liquid-fuel injection valve to introduce liquid fuel directly into the combustion chamber. The method further comprises delivering a gaseous fuel at injection pressure to an injection valve through a gaseous-fuel rail and actuating the gaseous-fuel injection valve to introduce gaseous fuel directly into the combustion chamber. The method further comprises collecting in a drain rail liquid fuel and gaseous fuel from the liquid-fuel injection valve and the gaseous-fuel injection valve, directing liquid fuel to a storage vessel, and directing gaseous fuel to a vent pipe.

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patent: 7124959 (2006-10-01), Baker et al.
patent: 2006/0081722 (2006-04-01), Kato et al.

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