Cummins Engine Company, Inc.

Randy P Hessel

Lester L Peters

Philip M Dimpelfeld

A S Ghuman

A multi-cylinder internal combustion engine is provided with an intake port injection system capable of effectively delivering port injected quantities of fuel to each cylinder while minimizing the number and size of the fuel injectors. The intake port injection system of the present invention includes a siamese or shared port arrangement having a plurality of common intake inlets, each delivering air from an intake manifold to one intake port of one cylinder and an intake port of a different cylinder. Two single intake inlets are also provided for delivering intake air solely to a single respective cylinder. Importantly, in a multi-cylinder engine having a total number of cylinders equal to N, the number of intake inlets, both common and single, equals N+1. Importantly, the total number of injectors also equals N+1. Although each intake inlet is served by only one injector, two injectors operate simultaneously to deliver fuel to a single cylinder via respective intake inlets. As a result, each injector only delivers half the total fuel quantity for a given injection and intake event resulting in smaller sized injectors and ultimately a reduction in packaging concerns and costs.

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Bloomington, IN, United States of America

Randy P Hessel