Efficiency enhancement to a laser ignition system
First Claim
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1. A method for a laser ignition in an engine cylinder, comprising:
- during an engine start, igniting an air/fuel mixture in the cylinder by focusing a laser at a first cylinder location; and
heating the cylinder with laser energy by focusing the laser at a second cylinder location different from the first cylinder location when engine temperature is less than a threshold, the heating including generating laser pulses during an exhaust stroke of the cylinder.
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Abstract
A method for a laser ignition system to operate in at least two modes based on a four-stroke combustion cycle, wherein laser light energy is generated to ignite an air/fuel mixture for combustion and may be additionally used for heating cylinder walls, such as during a cold start, at times other than when the laser ignites an air/fuel mixture for combustion.
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Citations
24 Claims
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1. A method for a laser ignition in an engine cylinder, comprising:
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during an engine start, igniting an air/fuel mixture in the cylinder by focusing a laser at a first cylinder location; and heating the cylinder with laser energy by focusing the laser at a second cylinder location different from the first cylinder location when engine temperature is less than a threshold, the heating including generating laser pulses during an exhaust stroke of the cylinder. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13)
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14. A method for a laser ignition in an engine cylinder, comprising:
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during an engine start, igniting an air/fuel mixture in the cylinder by focusing a laser at a first cylinder location; and heating the cylinder with laser energy by focusing the laser at a second cylinder location different from the first cylinder location, a heating duration at the second location being shorter at higher speeds than at lower speeds. - View Dependent Claims (15, 16, 17, 18, 19, 20, 21, 22, 23, 24)
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Specification