Patent ID: 7082920

Claim:
An ignition device for internal combustion engine comprising: a main chamber intended for containing a main combustible mixture and fitted with a compression system of said mixture; and an igniter comprising a precombustion chamber intended for containing a combustible mixture and an ignition system of the combustible mixture contained in the precombustion chamber, the precombustion chamber being defined by a precombustion chamber body having a head including passageways, the head of the pre-heating body separating the precombustion chamber from the main chamber and communicating the precombustion chamber and to main chamber through the passageways, wherein the passageways comprise at least one passageway enabling the propagation of a flame front from the precombustion chamber to the main chamber when the engine operates on low load and at least one passageway not enabling the propagation of a front flame from the precombustion chamber to the main chamber while enabling the passageway of the precombustion chamber to the main chamber of unstable compounds derived from the combustion of the combustible mixture in the precombustion chamber.