Laser-induced spark ignition for an internal combustion engine

US9284939B2 · kind B2 · utility

Assignee

• Robert Bosch GmbH · DE

Inventors

• Pascal Woerner · Ditzingen, DE
• Juergen Raimann · Weil der Stadt, DE
• Joerg Engelhardt · Ditzingen, DE
• Martin Weinrotter · Stuttgart, DE

Key dates

• Filing date: Apr 5, 2011
• Grant date: Mar 15, 2016
• Expiry date: Sep 30, 2032

Classification

• Technology area (CPC Y): Emerging Cross-Sectional Technologies
• CPC primary: Y02T10/12
• WIPO field: Engines, pumps, turbines
• WIPO sector: Mechanical engineering

Abstract

A laser spark plug for an internal combustion engine includes at least one element for guiding, shaping and/or generating laser radiation, a combustion chamber window and a housing. The housing has, on the opposite side of the combustion chamber window from the element, an aperture for the passage of the laser radiation guided, shaped and/or generated by the element into a prechamber disposed at the end of the housing on the combustion chamber side. At least one overflow channel is provided for a fluid connection between an internal space of the prechamber and a combustion chamber surrounding the prechamber. When a fluid flows into the internal space of the prechamber through the overflow channel, a fluid flow is obtained that enters the interior of the aperture at a minimum angle ε, in particular measured with respect to the longitudinal axis of the laser spark plug, of 45°.