Long-life traveling spark ignitor and associated firing...

F - Mech Eng,Light,Heat,Weapons – 02 – P

Patent

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F02P 9/00 (2006.01) H01T 13/50 (2006.01)

Patent

CA 2383187

An ignitor and associated electronics for igniting a combustible mixture in a cylinder of an internal combustion engine are described. The ignitor includes at least two spaced-apart electrodes that define a discharge gap. The space between the electrodes is substantially filled with a dielectric material. The dielectric material is spaced-apart from at least one of the electrodes to provide an air gap over which an initial voltage breakdown between the electrodes will occur. The air gap serves to vary the location of the initial breakdown and as a barrier to a short circuit between the electrodes due to carbon and/or metal deposit buildup on the dielectric material. The associated electronics provide a first potential between the electrodes that generates a plasma between the electrodes. Then the volume of the plasma is increased by the application of a second potential that creates a current through the plasma. The plasma, as well as the current passing through, is swept outward due to the interaction of Lorentz and thermal expansion forces with the plasma. Also described are relative orientations of the electrodes that lead to greater plasma formation.

La présente invention concerne un dispositif d'allumage et l'électronique correspondante permettant d'allumer un mélange combustible dans un cylindre d'un moteur à combustion interne. Le dispositif d'allumage comprend au moins deux électrodes espacées qui définissent un espace de décharge. L'espace entre les électrodes est essentiellement rempli d'un matériau diélectrique. Le matériau diélectrique est espacé d'au moins l'une des électrodes afin de définir un espace libre le long duquel a lieu une chute de tension initiale entre les électrodes. L'espace libre sert à varier l'emplacement de la chute de tension initiale et sert également de barrière contre un court-circuit entre les électrodes résultant de la formation d'un dépôt de carbone et/ou de métal sur le matériau diélectrique. L'électronique associée permet d'obtenir un premier potentiel entre les électrodes, qui conduit à la production d'un plasma entre lesdites électrodes. Le volume du plasma est alors augmenté par l'application d'un second potentiel qui produit un courant à travers le plasma. Le plasma, ainsi qui le courant qui le traverse, est envoyé vers l'extérieur en raison de l'interaction de Lorentz et des forces d'expansion thermiques qui agissent sur le plasma. Cette invention concerne également des orientations relatives des électrodes qui permettent la formation de plus de plasma.

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