초록 ▼

A laser ignition apparatus includes a laser oscillator which generates at least two successive pulse-shaped laser beams during each compression stroke of the engine. A first pulse-shaped laser beam is generated by a Q switching action of the laser oscillator and thus has a high peak output and a sec

A laser ignition apparatus includes a laser oscillator which generates at least two successive pulse-shaped laser beams during each compression stroke of the engine. A first pulse-shaped laser beam is generated by a Q switching action of the laser oscillator and thus has a high peak output and a second pulse-shaped laser beam is generated without the Q switching action and has a low peak output but a larger pulse duration than the first laser beam. The first and second pulse-shaped laser beams are guided and directed into the combustion chamber of the engine and the first laser beam of a high energy density causes the breakdown of the air-fuel mixture in the combustion chamber to develop a plasma and the second laser beam further increases the energy of the plasma thereby to ensure the setting fire of the air-fuel mixture.

대표청구항 ▼

A laser ignition apparatus for an internal combustion engine for igniting an air-fuel mixture supplied into a combustion chamber of said engine, comprising: means for generating a laser beam of a high energy density; means for controlling the generation of said laser beam in response to an ignition

A laser ignition apparatus for an internal combustion engine for igniting an air-fuel mixture supplied into a combustion chamber of said engine, comprising: means for generating a laser beam of a high energy density; means for controlling the generation of said laser beam in response to an ignition timing signal for said engine; and means for guiding and directing said laser beam from said laser beam generating means to a predetermined position within said combustion chamber, said laser beam generating means including a single laser oscillator for generating at least two pulse-shaped laser beams during each compression stroke of said engine, a first laser beam of said two pulse-shaped laser beams having a high energy density sufficient to cause breakdown of said air-fuel mixture, a second laser beam of said two pulse-shaped laser beams having an energy density lower than said first laser beam but having a longer duration, wherein said single laser oscillator includes means for controlling the production of said first laser beam of high energy density and said second laser beam of lower energy density and said first laser beam is effective to generate a plasma and said second laser beam is irradiated to the plasma before the plasma is diffused.