A combustion chamber is provided within an internal combustion engine, the chamber bounded by a cylinder bore, a primary end, and a secondary end. The secondary end reciprocates between a TDC position nearest the primary end and a BDC position. Induction and exhaust ports are timed to open and close to transfer air into, and gasses from, the chamber. The chamber becomes fuel stratified when the secondary end is positioned within a stratified distance of the primary end. When stratified, the chamber is comprised of a central region, a perimeter region, and a transfer passageway between regions. A fuel injector at the primary end injects fuel only into the central region and only prior to ignition. The perimeter region pumps air into the central region prior to ignition, creating tumble turbulence. Combustion is initiated near TDC in the central region and concluded near TDC in the transfer passageway.

An internal combustion engine (1) is provided with a supercharger (12) and a cylinder direct injection fuel injector (10). When the engine shifts in a low-speed supercharging region at a state where the wall temperature of a cylinder bore (3) is low, liquid fuel adheres to a wall surface of the cylinder bore (3) so that lubricating oil is diluted with the liquid fuel and released into a combustion chamber (4). As a result, there occurs abnormal combustion. In the present invention, the fuel injection amount is increased at the time when the engine shifts in a predetermined low-speed supercharging region. The lower the wall temperature of the cylinder bore, the larger the rate of increase of the fuel injection amount. This makes it possible to suppress the temperature of air-fuel mixture in the vicinity of compression top dead center and prevent the occurrence of abnormal combustion.

A method of igniting a fuel within a combustion chamber defined by a cylinder block of an internal combustion engine includes injecting a first portion of a fuel into the combustion chamber, and energizing a first plasma igniter. The first plasma igniter is configured for generating a first plurality of free radicals, extends through a cylinder head mated to the cylinder block, and protrudes into an intake port defined by the cylinder head that is disposable in fluid communication with the combustion chamber. After injecting the first portion, the method includes activating a second igniter configured for initiating a flame within the combustion chamber to thereby ignite the fuel. The second igniter extends through the cylinder head and protrudes into the combustion chamber. An internal combustion engine is also disclosed.

An internal combustion engine for gaseous fuel includes a cylinder and a piston for reciprocal movement in the cylinder along a reciprocal axis, whereby a combustion chamber is at least partially delimited by the cylinder and the piston. The piston includes a piston crown facing the combustion chamber, a piston crown projection of the piston crown in a direction parallel to the reciprocal axis and onto a piston crown plane extending transversally to the reciprocal axis having a piston crown center point, the piston crown comprising a piston bowl surface defining a piston bowl and a piston rim portion enclosing the piston bowl surface. A piston bowl opening is the intersection between the piston rim portion and the piston bowl surface. The piston bowl opening has an opening center of gravity in the piston crown plane. The opening center of gravity is offset from the piston crown center point.

A control device (7) of a cylinder direct injection type internal combustion engine (1) controls a fuel injection device (4) and an ignition device (5), executes injection of the fuel and ignition over multiple times, and executes a control of varying an interval between a timing of the injection of the fuel and a timing of the ignition, at the time of an ignition start in which the fuel is injected into a combustion chamber (3) in an expansion stroke with rotation of an output shaft (6) is stopped state and the fuel is ignited to start the rotation of the output shaft (6). The control device (7) varies the interval between the timing of the injection of the fuel and the timing of the ignition by adjusting a correlation of a pitch of the injection of the fuel over multiple times and a pitch of the ignition over multiple times. Therefore, the internal combustion engine (1) and the control device (7) have an effect of being able to enhance the starting property.