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A system and method for controlling combustion in a direct injection spark ignition internal combustion engine inject fuel directly into a combustion chamber in a wide-angle, hollow-cone spray to form a vortex that draws fuel vapor out of the spray to form a combustible fuel-air mixture at a spark l

A system and method for controlling combustion in a direct injection spark ignition internal combustion engine inject fuel directly into a combustion chamber in a wide-angle, hollow-cone spray to form a vortex that draws fuel vapor out of the spray to form a combustible fuel-air mixture at a spark location outside the hollow-cone spray. Various piston combustion bowl configurations further enhance the stability of the vortex and reduce fuel impingement on the piston surface while providing a desired compression ratio. Cylinder airflow is controlled to produce substantial swirl flow resulting in a more compact fuel cloud around the spark location to reduce over-mixing and improve robustness to cycle-to-cycle variation in the mixing process.

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A system and method for controlling combustion in a direct injection spark ignition internal combustion engine inject fuel directly into a combustion chamber in a wide-angle, hollow-cone spray to form a vortex that draws fuel vapor out of the spray to form a combustible fuel-air mixture at a spark l

A system and method for controlling combustion in a direct injection spark ignition internal combustion engine inject fuel directly into a combustion chamber in a wide-angle, hollow-cone spray to form a vortex that draws fuel vapor out of the spray to form a combustible fuel-air mixture at a spark location outside the hollow-cone spray. Various piston combustion bowl configurations further enhance the stability of the vortex and reduce fuel impingement on the piston surface while providing a desired compression ratio. Cylinder airflow is controlled to produce substantial swirl flow resulting in a more compact fuel cloud around the spark location to reduce over-mixing and improve robustness to cycle-to-cycle variation in the mixing process. nch pipes being formed integrally with said one wall and disposed inside said dispensing box body while said opening is formed on said another wall.7. An intake system for a multi-cylinder engine according to claim 6, wherein said intake air-dispensing box is disposed in a vertically longer shape between rearward-directed heads of the first and second banks of the engine for an outboard engine system with a crankshaft disposed vertically and a rear wall of an engine hood for the outboard engine system for covering said engine; said intake air inlet is provided in an upper end of said intake air-dispensing box; and said actuator is mounted at a lower end of said intake air-dispensing box.8. An intake system for a multi-cylinder engine according to claim 6, wherein a plurality of said valve bores opened and closed by a plurality of said on-off valves and at least three bearing bores coaxially arranged with said valve bores interposed therebetween are made in the other half of said partition wall.9. An intake system for a multi-cylinder engine according to claim 6 or7, wherein the other half of said partition wall is divided into a main partition other-half body and a partition piece so that said valve bore is divided along said bearing bores into halves, said partition piece being bolted to said main partition other-half body.10. An intake system for a multi-cylinder engine, in which an intake air inlet is provided in one end of an intake air-dispensing box disposed on one side of an engine having first and second banks so that said intake air inlet leads to an intake passage in a throttle body; the inside of said intake air-dispensing box is divided by a partition wall into first and second dispensing chambers communicating with said intake air inlet, respectively; an on-off valve capable of permitting said first and second dispensing chambers to be put into and out of communication with each other is mounted in said partition wall; and first and second intake branch pipes opening into said first and second dispensing chambers respectively and leading to intake ports in said first and second banks respectively are connected to said intake air-dispensing box; wherein said intake air-dispensing box is comprised of a dispensing box body which includes said intake air inlet, said first and second intake branch pipes and one of halves of said partition wall, said dispensing box body having and which has an opening provided in its outer wall opposite from said first and second intake branch pipes to extend between said first and second dispensing chambers, and a lid which is made of a light alloy by casting and which has the other half of said partition wall and a loop-shaped surrounding wall integrally, projectingly provided on its inner surface and detachably coupled to an outer surface of said dispensing box body to surround said opening; a valve bore permitting said first and second dispensing chambers to be put into communication with each other and bearing bore