JPH0893620A - Laser ignition device - Google Patents

Abstract

PURPOSE: To provide a laser ignition device capable of introducing a laser beam into all cylinders by the use of one laser device, and realizing low cost and miniaturization of the ignition device. CONSTITUTION: A laser beam from the same laser device is synchronized with the crank angle to be introduced into the inside of a cylinder in order of combustion through one of the reflecting mirrors provided on the respective cylinder heads of a multi-cylinder engine. Further, in the first invention, the reflecting mirror above the exploded cylinder is inserted in the optical path 13 of the laser beam through a mirror controller, and the reflecting mirrors above the previously burned cylinders are raised up outside the optical path.

Description

Detailed Description of the Invention

[0001]

FIELD OF THE INVENTION The present invention relates to an ignition device for a liquid fuel engine.

[0002]

2. Description of the Related Art FIG. 3 shows a conventional laser ignition device. From the fuel injection nozzle 2 fixed to the combustion chamber 1, the fuel 3 is injected in synchronization with the crank angle of the engine. The laser light 4 is emitted in pulses from a laser light source (not shown) in synchronization with fuel injection, passes through the laser light guide 5, is condensed by a condenser lens 6, and passes through an optical window 7 provided on the combustion chamber side. Since the sprayed fuel is irradiated, plasma 9 is generated from the fuel 3 and the fuel is ignited and burned.

[0003]

However, in the conventional multi-cylinder engine, in order to introduce the laser beam into each cylinder, a laser device must be arranged corresponding to each cylinder, and the ignition device occupies the engine. The price ratio is large and the cost of the engine becomes high.

An object of the present invention is to provide a laser ignition device which uses one laser device and introduces a laser beam into the cylinder in synchronization with the ignition timing of each cylinder.

[0005]

A laser ignition device according to a first aspect of the present invention has a fuel injection nozzle arranged in a cylinder of an internal combustion engine, and a spray injected from the fuel injection nozzle is condensed from the outside by a lens through an optical window. In a multi-cylinder internal combustion engine that irradiates and ignites the generated laser light, a reflecting mirror that moves in synchronization with the crank angle is arranged on each cylinder head, and the laser light is introduced into the cylinder through the reflecting mirror. Is characterized by.

In the laser ignition device of the second invention, a fuel injection nozzle is arranged in the cylinder of an internal combustion engine, and the spray injected from the fuel injection nozzle is irradiated with laser light collected by a lens from the outside through an optical window. In a multi-cylinder internal combustion engine that is ignited by laser, a reflecting mirror fixed facing the optical window of each cylinder is sequentially irradiated with laser light according to a crank angle.

[0007]

Since the present invention is configured as described above, one laser device is used to emit laser light to a required reflecting mirror on the cylinder in synchronism with the rotation of the crankshaft, and the laser light is emitted into the corresponding cylinder. Is radiated to irradiate the atomized fuel to ignite and burn.

[0008]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A first embodiment of the present invention will be described below with reference to FIG. The feature of the present invention is that ignition combustion can be realized with only one laser device for the engine. FIG. 1 shows a four-cylinder internal combustion engine in which a fuel injection nozzle is arranged in a cylinder of an internal combustion engine, and the spray injected from the fuel injection nozzle is irradiated with laser light focused by a lens from the outside through an optical window and ignited. It is a block diagram of an engine.

More specifically, the crank angle sensor 10 is provided in the vicinity of the flywheel of the crankshaft 17, the crank angle is measured by the crank angle sensor, and the crank angle sensor is used to measure the crank angle. Fuel is injected in synchronization with the corner. The laser light for igniting the fuel is introduced into the cylinder as follows. That is, the output from the crank angle sensor 10 is simultaneously input to the mirror controller 14.

The cylinder to be burned next (11 in the embodiment)
c) The reflecting mirror 12c provided on the above is inserted into the optical path 13 of the laser light during the laser emission, and the reflecting mirror 12b on the cylinder 11b which was burned last time is pulled out of the optical path to bring the laser light into the cylinder 11c. Introduce and ignite the atomized fuel. A mirror driving device 15 is provided so as to insert and pull up the reflecting mirror 12 in the case of burning other cylinders, and the device is controlled by the mirror controller 14.

Next, a second embodiment of the present invention will be described. In FIG. 2, the laser light reflecting mirrors 12a to 12d are fixed with their angles kept so that the reflected light enters the optical windows in the laser light guides 5a to 5d. The laser device 16 is configured so that the irradiation angle can be changed. Mirror controller 1 to which the output of crank angle sensor 10 is input
Reference numeral 4 indicates the mirrors 12a to 12 for reflecting the laser light by shaking the head sequentially.
It irradiates d and ignites the fuel.

[0012]

INDUSTRIAL APPLICABILITY Through the reflecting mirrors provided on each cylinder head of a multi-cylinder engine, laser light emitted from the same laser device is introduced into the cylinder in synchronization with the combustion order in synchronization with the crank angle. Therefore, the laser light can be introduced into all the cylinders by one laser device, and the cost and size of the ignition device can be reduced.

[Brief description of drawings]

FIG. 1 is a configuration diagram according to a first embodiment of the present invention,

FIG. 2 is a configuration diagram according to the second embodiment,

FIG. 3 is a view showing a conventional laser ignition means.

[Explanation of symbols]

1 ... Engine combustion chamber, 2 ... Fuel injection nozzle, 3 ... Fuel,
4 ... laser light, 5 ... laser light guide, 6 ... condenser lens,
7 ... Optical window, 8 ... Piston, 9 ... Plasma, 10 ... Crank angle sensor, 11a-11d ... Cylinder, 12a-1
2d ... Mirror for laser light reflection, 13 ... Optical path of laser light, 14 ...
Mirror controller, 15a to 15d ... Mirror drive device 16,
16 '... laser device, 17 ... crankshaft.

Front Page Continuation (72) Inventor Noriyasu Inagaka 5717-1 Fukahori-cho, Nagasaki-shi, Nagasaki Sanryo Heavy Industries Ltd. Nagasaki Research Institute

Claims (2)

[Claims] 1. A multi-cylinder in which a fuel injection nozzle is arranged in a cylinder of an internal combustion engine, and the spray injected from the fuel injection nozzle is irradiated with laser light focused by a lens from the outside through an optical window to ignite. In an internal combustion engine, a laser ignition device characterized in that a reflecting mirror that moves in synchronization with a crank angle is arranged on each cylinder head, and laser light is introduced into the cylinder through the reflecting mirror. 2. A multi-cylinder internal combustion engine in which a fuel injection nozzle is arranged in a cylinder of an internal combustion engine, and the spray injected from the fuel injection nozzle is irradiated with laser light collected by a lens from the outside through an optical window to ignite. A laser ignition device characterized in that, in an engine, a reflecting mirror fixed facing an optical window of each cylinder is sequentially irradiated with laser light according to a crank angle.