Laser ignition system for gaseous fuel-powered engine

Patent metadata

Field	Value
Publication number	US-2016195057-A1
Application number	US-201615067188-A
Country	US
Kind code	A1
Filing date	Mar 11, 2016
Priority date	Mar 11, 2016
Publication date	Jul 7, 2016
Grant date	—

Abstract

A gaseous fuel-powered engine includes a fuel injector configured to selectively inject a plurality of gas plumes into the combustion chamber, and a laser ignition system configured to selectively ignite the gas plumes within the combustion chamber. The laser ignition system includes a laser source configured to generate at least one laser beam, and a beam splitter for splitting the laser beam into a plurality of partial laser beams. A focusing unit is provided to direct each partial laser beam to corresponding focal points in the gas plumes within the combustion chamber. A controller is configured to determine an operating state of the gaseous fuel-powered engine, regulate an intensity of each partial laser beam, and operate the focusing unit for directing the partial laser beams within the combustion chamber to ignite the gas plumes at the focal points during injection of the gas plumes within the combustion chamber.

First claim

What is claimed is:

1 . A gaseous fuel-powered engine having an engine block, an engine head disposed on the engine block, and a combustion chamber defined substantially within the engine block, the gaseous fuel-powered engine comprising:
a fuel injector provided on the engine head to selectively inject a plurality of gas plumes into the combustion chamber; and a laser ignition system provided on the engine head, the laser ignition system being configured to selectively ignite the plurality of gas plumes within the combustion chamber, the laser ignition system including:
a laser source configured to generate at least one laser beam;
a beam splitter optically associated with the laser source for splitting the laser beam into a plurality of partial laser beams;
a focusing unit optically associated with the beam splitter and the combustion chamber, the focusing unit being configured to direct each partial laser beam of the plurality of partial laser beams to corresponding focal points in the plurality of gas plumes within the combustion chamber; and
a controller in communication with the laser source and the focusing unit, wherein the controller is configured to:
determine an operating state of the gaseous fuel-powered engine;
regulate, based on the operating state of the gaseous fuel-powered engine, an intensity of each partial laser beam of the plurality of partial laser beams; and
operate, based on the operating state of the gaseous fuel-powered engine, the focusing unit for directing the plurality of partial laser beams to move the focal points in the plurality of gas plumes within the combustion chamber,

wherein the plurality of partial laser beams ignite the plurality of gas plumes at the focal points during the injection of the plurality of gas plumes within the combustion chamber.

Assignees

• Caterpillar Inc

Inventors

• Ginter David M
• Kim Arnold M
• Singh Jaswinder
• Svensson Kenth I

Classifications

• F02P15/08

  having multiple-spark ignition, i.e. ignition occurring simultaneously at different places in one engine cylinder or in two or more separate engine cylinders · CPC title

• F02P23/04 Primary

  Other physical ignition means, e.g. using laser rays · CPC title

• H01S3/005

  Optical devices external to the laser cavity, specially adapted for lasers, e.g. for homogenisation of the beam or for manipulating laser pulses, e.g. pulse shaping (shaping laser beam for working metal or other materials B23K26/06; optical elements, systems or apparatus in general G02B) · CPC title

• F02B23/101

  the injector being placed on or close to the cylinder centre axis, e.g. with mixture formation using spray guided concepts · CPC title

• F02B2023/103

  the injector having a multi-hole nozzle for generating multiple sprays · CPC title