Internal combustion engines and control

Engine according to any one of the preceding claims, wherein the fuel injector is arranged as a central-injection direct fuel injector.

Engine according to any one of the preceding claims arranged for spray-guided combustion.

Engine according to any one of the preceding claims, wherein said fuel delivery injector is adapted to generate a stratified charge within said combustion chamber.

Engine according to any one of the preceding claims, wherein the valved inlet air duct is arranged to provide gas motion in said combustion chamber having a tumble ratio that is less than about 2.0 over the whole range of inlet port valve lift values, and preferably less than 1.5 and more preferably about 1.0 over a substantial part of inlet valve lift.

Engine according to any one of the preceding claims, further including an ignition timing system for selective ignition of a stratified charge delivered into the combustion chamber through said fuel delivery injector, said ignition timing system arranged to provide ignition timings in the range of about 5° to 40° BTDC during a compression stroke and over a defined engine load and speed range.

Internal combustion engine comprising at least one combustion chamber having an inlet port with an associated inlet valve for inlet of combustion air to said chamber generally along a first axis, an ignition device and at least one fuel delivery means communicating fuel directly to said chamber in a direction generally parallel to said first axis and in the vicinity of said ignition device, wherein said generally parallel direction of said inlet air and said fuel reduces over-enleanment of fuel in end gas regions of said combustion chamber, and wherein said generally parallel direction is axial to said combustion chamber.

Internal combustion engine comprising at least one combustion chamber with a fuel delivery injector and an ignition means arranged for spray guided injection of fuel into said combustion chamber, said engine further comprising at least one valved inlet air duct for delivering combustion air into said combustion chamber, wherein at least said inlet air duct and/or its valve is arranged whereby low tumble gas motion is produced within said combustion chamber such as to reduce over-enleanment of fuel in end gas regions of said spray guided fuel.