METHOD AND SYSTEM FOR LASER IGNITION CONTROL
First Claim
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1. An engine method, comprising:
- dynamically adjusting a laser intensity of an engine laser ignition device during a cylinder ignition event based on a monitored cylinder flame quality.
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Abstract
Methods and systems are provided for closed-loop adjusting a laser intensity of a laser ignition device of a hybrid vehicle. The laser intensity applied over consecutive laser ignition events is decreased until a flame quality is degraded for a threshold number of cylinder combustion events. The laser intensity is then increased to improve flame quality and the closed-loop adjustment is reiterated.
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Citations
20 Claims
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1. An engine method, comprising:
dynamically adjusting a laser intensity of an engine laser ignition device during a cylinder ignition event based on a monitored cylinder flame quality. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11)
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12. A method for a hybrid vehicle engine including a laser ignition system, comprising:
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following a laser ignition event of the engine, reducing a laser intensity at a plurality of subsequent laser ignition events of the engine until an inferred combustion flame quality reaches a threshold, the inferred combustion flame quality based on a photodetector coupled to the laser ignition system; and then increasing the laser intensity responsive to reaching the threshold. - View Dependent Claims (13, 14, 15, 16, 17, 18)
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19. A hybrid vehicle system, comprising:
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an engine including a cylinder, the cylinder including a piston; an electric motor-generator couple to a battery; a battery-operated laser ignition device coupled to a cylinder head; a photodetector configured for infra-red detection coupled to the laser ignition device; and a controller with computer readable instructions for; at each ignition event, estimating a flame quality inside the cylinder using the photodetector; in response to the estimated flame quality being higher than a threshold, reducing a laser intensity of the laser ignition device at a subsequent ignition event; and in response to the estimated flame quality being lower than the threshold, increasing the laser intensity of the laser ignition device for a threshold number of ignition events. - View Dependent Claims (20)
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Specification