CPC F02M 43/04 (2013.01) [F02D 19/0694 (2013.01); F02D 19/0649 (2013.01); F02D 19/10 (2013.01); F02M 47/027 (2013.01); F02M 2200/46 (2013.01)] | 18 Claims |
1. A method of operating an engine comprising:
admitting a liquid pilot fuel into a pilot fuel passage in a fuel injector;
displacing a liquid primary fuel in a primary fuel passage in the fuel injector with liquid pilot fuel from the pilot fuel passage to form a segmented fuel charge of leading pilot fuel and trailing primary fuel in the primary fuel passage;
increasing a fluid pressure in the primary fuel passage to an injection pressure after the formation of the segmented fuel charge;
opening an outlet check in the fuel injector to inject the segmented fuel charge into a combustion cylinder in the engine; and
igniting, within the combustion cylinder, the liquid primary fuel of the segmented fuel charge based on compression-ignition of the liquid pilot fuel of the segmented fuel charge.
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