Laser-induced spark ignition for an internal combustion engine

摘要

Laser spark plug for an internal combustion engine has at least one laser unit for guiding, shaping and/or generating laser radiation, further including a combustion chamber window, and a housing which has, on the opposite side of the combustion chamber window from the laser unit, an aperture for the passage of the laser radiation guided, shaped and/or generated by the laser unit into a combustion chamber, the length of the aperture being 4 mm or more.

主权项

1. A laser spark plug for an internal combustion engine, comprising:
at least one laser unit for at least one of producing, shaping, and guiding laser radiation; a combustion chamber window; and a housing having an aperture at an end of the housing on the combustion chamber side, the aperture being on the opposite side of the combustion chamber window from the laser unit, wherein the aperture facilitates passage of the laser radiation from the laser unit into a combustion chamber, and wherein the aperture has a length of at least 4 mm, wherein:
the aperture facilitates passage of the laser radiation from the laser unit into a prechamber which is surrounded by the combustion chamber; andat least one overflow channel provides a fluid connection between an inner space of the prechamber and the combustion chamber surrounding the prechamber, the at least one overflow channel being configured such that when a fluid flow through the overflow channel into the inner space of the prechamber is established, a resulting fluid flow which enters into the interior of the aperture at a minimum angle of 45° measured relative to the longitudinal axis of the laser spark plug is provided.