JP2006161612A - Laser ignition type engine with laser beam dividing device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a laser ignition type engine of simple structure capable of dividing one laser beam into a plurality of beams to radiate the divided laser beam to a plurality of targets inside a combustion chamber or to distribute the divided laser beams to a plurality of cylinders. <P>SOLUTION: The laser ignition type engine is structured to transmit the laser beam from a laser oscillating device to a laser beams introducing means, which is installed in a cylinder head, through an optical fiber to ignite the gas inside the combustion chamber with plasma generated by radiation from the laser beam introducing means to the targets inside the combustion chamber. A laser beam dividing device structured by combining a half mirror with a total reflection mirror is provided to divide the incident laser beam into a plurality of laser beams by passing it through the half mirror and the total reflection mirror. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention is mainly applied to a premixed combustion laser ignition type engine such as a gas engine, and transmits a laser beam from a laser oscillation device to a laser beam condensing unit through an optical fiber, and from the laser beam condensing unit to a combustion chamber. The present invention relates to a laser ignition engine configured to ignite a gas in a combustion chamber by plasma generated by irradiating a target, the laser ignition engine including a laser beam splitting device.

  In a premixed lean combustion gas engine, ignition is performed by igniting a rich mixture ratio gas in the auxiliary chamber by means of an ignition plug mounted in the auxiliary chamber, and the ignition flame is injected into the lean mixture in the main combustion chamber to cause main combustion. A pilot fuel is injected into the mixed gas in the auxiliary chamber by a spark plug ignition method or a pilot fuel injection valve mounted in the auxiliary chamber to ignite, and the ignition flame is injected into a lean mixture in the main combustion chamber. Instead of the pilot fuel injection ignition system that performs main combustion, a laser ignition system that generates plasma by irradiating laser light onto a target provided in a combustion chamber and ignites and burns gas in the combustion chamber is used. A technique for promoting ignition combustion and suppressing the amount of NOx generated has been proposed.

As a premixed lean combustion gas engine equipped with such a laser ignition system, techniques of Patent Document 1 (Japanese Patent Laid-Open No. 7-217521) and Patent Document 2 (Japanese Patent Laid-Open No. 9-42138) have been proposed.
In the technique of Patent Document 1, a plurality of wedge substrates are installed in the optical path of the laser beam, and each wedge substrate is rotated at a different rotational speed so that the laser beam is oscillated and irradiated in a wide range. It is composed.
Further, in the technique of Patent Document 2, the focus is set so that the laser beam can be constantly irradiated onto the target by the engine rotation in the optical path of the laser beam between the laser oscillation device and one target provided on the piston surface. Equipped with a variable device.

JP-A-7-217521 Japanese Patent Laid-Open No. 9-42138

  However, the prior art has the following problems to be solved. That is, in the technique of Patent Document 1 (Japanese Patent Laid-Open No. 7-217521), a laser beam is passed while rotating the wedge substrate, and the laser beam is swayed to a target within a limited range of the upper surface of the piston in the combustion chamber. In the technique of Patent Document 2 (Japanese Patent Laid-Open No. 9-42138), the laser beam can always be accurately irradiated onto one target by rotating the engine. Only with a variable focus device, a single laser beam can be split into a plurality of light beams and irradiated to a plurality of targets in a combustion chamber or distributed to a plurality of cylinders. There is no means that can split light into multiple light beams.

  In view of the problems of the prior art, the present invention can split a single laser beam into a plurality of parts with a simple structure and irradiate the plurality of targets in the combustion chamber with the spectral laser beam. An object of the present invention is to provide a laser ignition type engine capable of distributing the engine to a plurality of cylinders.

  The present invention achieves such an object, and transmits laser light from a laser oscillation device to a laser light introducing means mounted on a cylinder head through an optical fiber, and irradiates a target in a combustion chamber from the laser light introducing means. In a laser ignition engine configured to ignite a gas in the combustion chamber by generated plasma, the laser is configured by combining a half mirror and a total reflection mirror, and the incident laser beam is transmitted to the half mirror and the total reflection mirror. A laser beam spectroscopic device that splits a plurality of laser beams by passing through a reflection mirror is provided.

  Preferably, in the invention, a plurality of sets of the half mirror and the total reflection mirror are provided, and one of the laser beams transmitted or reflected by the upstream half mirror is incident on the total reflection mirror and the other is used as the downstream half mirror. Configure to receive light.

  According to this invention, a plurality of combinations of half mirrors and total reflection mirrors are provided, and the laser light is incident on the upstream half mirror to be separated into reflected light and transmitted light by the half mirror, and the reflection By repeating the procedure of entering one of light or transmitted light into the total reflection mirror and inputting the other into the half mirror at the downstream stage, an extremely simple structure of combining a plurality of pairs of half mirrors and total reflection mirrors is possible. It is possible to split one laser beam into a plurality of laser beams and irradiate a plurality of targets in the combustion chamber. Alternatively, it can be distributed to a plurality of cylinders.

Thus, one laser beam can be split into a plurality of laser beams by the laser beam spectroscopic device, and can be easily irradiated to targets arranged at a plurality of locations in the combustion chamber. By irradiation, the combustion chamber gas is ignited uniformly at a plurality of locations in the combustion chamber, thereby avoiding the occurrence of defective ignition and shortening the ignition combustion time per gas per target. The ignition combustion performance is improved.
Further, as described above, one laser beam can be split into a plurality of laser beams and easily distributed to a plurality of cylinders with a very simple structure in which a plurality of pairs of half mirrors and total reflection mirrors are combined. it can.

Furthermore, in this invention, the downstream side of the laser beam spectroscopic device configured as described above is configured as follows, so that laser beams split into a plurality of beams can be easily applied to targets arranged at a plurality of locations in the combustion chamber. And the spectral laser can be distributed to a plurality of cylinders with high accuracy.
(1) Provided in the same number as the plurality of laser beams emitted from the most downstream mirrors of the half mirrors and total reflection mirrors provided in a plurality of sets, refract each of the plurality of laser beams, and on the required light receiving means side A light-emitting prism that emits light toward the
(2) Provide the same number of condensing lenses as the plurality of laser beams emitted from the most downstream mirror in the optical path between the most downstream mirror and the light output prism.

In the laser ignition engine, the present invention has a plurality of refracting surfaces for dividing the laser beam incident from the apex into a plurality of laser beams, and emits the divided laser beams in different directions. A pyramid-shaped split prism is provided.
According to this invention, a single laser beam is incident on the split prism from the apex of the pyramidal split prism having a plurality of refractive surfaces, and is emitted from the multiple refractive surfaces through the split prism. With a simple and low-cost structure in which only the split prism is installed, one laser beam can be split into a plurality of laser beams and emitted in different directions.

In such an invention, the downstream side of the pyramid-shaped split prism configured as described above is configured as follows, so that the laser light split into a plurality of parts by the split prism can be easily arranged at a plurality of locations in the combustion chamber. The target can be easily and accurately irradiated, and the dispersed laser light can be distributed to a plurality of cylinders with high accuracy.
(1) For each of a plurality of laser beams emitted from the split prism, two light output prisms are provided in series on the optical path of the laser beam, and each of the plurality of laser beams output from the split prism is the two The light output prisms are sequentially passed through the light output prisms to emit light toward the required light receiving means.
(2) For each of a plurality of laser beams emitted from the split prism, a light output prism having two refracting surfaces that refract the laser light is provided in the optical path of the laser beam, and a plurality of lights output from the split prism Each of the laser beams is configured to emit light toward the required light receiving means side through the two refracting surfaces of the light emitting prism in order.

In the laser ignition engine, the present invention has a plurality of refracting surfaces forming a pyramidal inner surface that divides the laser beam incident from an internal vertex into a plurality of laser beams, A split prism that emits laser light in different directions is provided.
According to this invention, one laser beam enters the split prism from the inner vertex of the split prism having a plurality of pyramidal inner surfaces formed therein, and exits from the plurality of refractive inner surfaces through the split prism. Thus, with a simple and low-cost structure in which only a split prism having a pyramidal inner surface is provided, one laser beam can be split into a plurality of laser beams and emitted in different directions.

According to the present invention, it is possible to irradiate a plurality of targets in a combustion chamber by splitting one laser beam into a plurality of laser beams with an extremely simple structure in which a plurality of pairs of half mirrors and total reflection mirrors are combined. It becomes. Alternatively, it can be distributed to a plurality of cylinders.
Thereby, it is possible to easily split one laser beam into a plurality of laser beams and irradiate the targets arranged at a plurality of locations in the combustion chamber, and by irradiating the plurality of targets with the laser beams, Multiple locations serve as ignition points for the combustion chamber gas, and the combustion chamber gas is ignited evenly, avoiding the occurrence of poor ignition, and shortening the ignition / combustion time for the gas per target, improving the ignition combustion performance To do.
Further, as described above, one laser beam can be split into a plurality of laser beams and easily distributed to a plurality of cylinders with a very simple structure in which a plurality of pairs of half mirrors and total reflection mirrors are combined. it can.

In addition, according to the present invention, one laser beam is incident on the split prism from the apex of the pyramid-shaped split prism having a plurality of refracting surfaces, and is emitted from the plurality of refracting surfaces through the split prism. With a simple and low-cost structure in which only a prismatic prism is provided, one laser beam can be split into a plurality of laser beams and emitted in different directions.
Furthermore, according to the present invention, one laser beam is incident on the split prism from the inner vertex of the split prism having a plurality of pyramidal inner surfaces formed therein, and is emitted from the plurality of refractive inner surfaces through the split prism. Thus, with a simple and low-cost structure in which only a split prism having a pyramidal inner surface is provided, one laser beam can be split into a plurality of laser beams and emitted in different directions.

  Hereinafter, the present invention will be described in detail with reference to the embodiments shown in the drawings. However, the dimensions, materials, shapes, relative arrangements, and the like of the component parts described in this example are not intended to limit the scope of the present invention only to specific examples unless otherwise specified. Only.

FIG. 5A is a configuration diagram showing a first example of a laser light transmission system of a laser ignition engine to which the present invention is applied.
In FIG. 5A, 1 is a laser oscillation device that oscillates a laser beam (laser pulse) 02, 2 is a pulse interval of the laser beam 02 oscillated from the laser oscillation device 1, and laser beam energy (laser beam intensity). ) And the like. Reference numeral 50 denotes an optical fiber for transmitting the laser beam 02 from the laser oscillation device 1 as described later.
Reference numeral 51 denotes a rotational speed detector that detects the rotational speed of the engine, and reference numeral 52 denotes a load detector that detects the load of the engine. A crank angle sensor 53 detects a crank angle of the crankshaft.

  Reference numeral 3 denotes a controller which receives an engine speed detection value from the engine speed detector 51, an engine load detection value from the load detector 52, and an engine crank angle detection value from the crank angle sensor 53. Then, based on the detected value of the engine speed or the detected value of the engine load, the pulse interval of the laser light 02 corresponding to the engine speed or the engine load, laser light energy (laser light intensity), and the like are calculated. At the same time, the oscillation timing of the laser beam according to the firing order of each cylinder is calculated based on the detected crank angle value and is input to the laser control device 2 and a laser beam cylinder distributor 7 described later.

  Reference numeral 7 denotes a laser beam cylinder distributing device that distributes the laser beam 02 from the laser oscillation device 1 to each cylinder. The laser beam 02 is split by a combination of a plurality of mirrors, a prism or the like to split the laser beam 02 into a plurality of beams. The light is split and distributed to each cylinder. That is, in the laser beam cylinder distribution device 7, the laser beam 02 is received by the engine 3 from the controller 3, is distributed to each cylinder according to the ignition sequence, and is distributed to the target 5 of each cylinder through the optical fiber 50. To transmit.

Reference numeral 12 is a cylinder head, 10 is a piston, 11 is a cylinder liner, and 13 is a combustion chamber defined by the cylinder head 12, piston 10 and cylinder liner 11. 14 is an intake valve that opens and closes the intake port, and 16 is an exhaust valve that opens and closes the exhaust port.
The exhaust valve 16 and the intake valve 14 (see FIG. 5B) are rotated in both forward and reverse directions at a super-low speed stepwise or continuously by a valve rotating device 27 connected to the upper part thereof. Yes. Such a valve rotation device 27 uses a device similar to a conventionally used exhaust valve rotation device or intake valve rotation device, or when the valve rotation device 27 is already mounted on the exhaust valve 16 or the intake valve 14. Is used.
Reference numeral 5 denotes a target projecting from the lower surface of each of the exhaust valve 16 and the intake valve 14, and each target 5 is provided with the number of targets 5 (four in this example) by a laser beam spectrometer 100 as will be described later. ) Is irradiated with the same number of laser beams 02.
The present invention relates to the configuration of the laser beam spectroscopic device 100.

FIG. 1A is a schematic diagram of a laser beam spectrometer according to a first embodiment of the present invention, and FIG.
1A and 1B, reference numeral 101 denotes a half mirror, and reference numeral 102 denotes a total reflection mirror. In this embodiment, a plurality of combinations of the half mirror 101 and the total reflection mirror 102 are provided. It is composed. Reference numeral 103 denotes a light output prism, which is installed in the same number as the target 5 (FIG. 5). Reference numeral 104 denotes a condenser lens installed in the optical path of the laser beam 02 between the mirror assembly 101 and each light output prism 103.
As shown in FIG. 1B, the mirror assembly 101 transmits one of the laser beams 02 transmitted or reflected through the upstream half mirror 101a to the total reflection mirror 102b and the other half as the downstream half mirror. One of the laser beams 02 that have entered 101b and transmitted or reflected through the downstream half mirror 101b enters the downstream total reflection mirror 102b, and the other enters the downstream half mirror 101 (enters the downstream half mirror 101b). The laser beam 02 emitted from an arbitrary half mirror 101 or total reflection mirror 102 is incident on the condenser lens 104.

During operation of such a laser ignition type engine, as shown in FIGS. 5A and 5B, the controller 3 detects the value of the engine speed from the speed detector 51, and the value from the load detector 52. Based on the detected value of the engine load and the detected value of the crank angle from the crank angle detector 53, a control signal for the oscillation timing of the laser beam 02 from the laser oscillator 1 is output to the laser controller 2.
In the laser control device 2, the laser light 02 is oscillated from the laser oscillation device 1 based on the control signal of the oscillation timing of the laser light 02 input from the controller 3 to the laser control device 2.
The laser beam 02 from the laser oscillation device 1 is incident on the laser beam cylinder distributor 7 through the optical fiber 50.
In the laser beam cylinder distribution device 7, the laser beam 02 is received in accordance with the ignition sequence signal of the engine from the controller 3, dispersed according to the ignition sequence, and distributed to each cylinder. Transmit to the optical spectroscopic device 100.

  In the first embodiment, as shown in FIG. 5, the laser beam 02 introduced from the laser beam cylinder distributor 7 through the optical fiber 50 into the laser beam spectrometer 100 is as shown in FIGS. 1 (A) and 1 (B). The light is incident on the first stage (upstream stage) half mirror 101 a of the mirror assembly 101. Next, as shown in FIG. 1B, the laser beam 02 transmitted through the first-stage half mirror 101a is incident on the second-stage half mirror 101b and reflected by the first-stage half mirror 101a. Is incident on the first-stage total reflection mirror 102a, and the laser light 02 reflected by the second-stage half mirror 102b repeats the light emission and the incident light that are incident on the second-stage total reflection mirror 102b.

The laser light 02a transmitted through the second half mirror 102b, the laser light 02b reflected by the first total reflection mirror 102, the laser light 02c reflected by the second total reflection mirror 102b, the third stage The laser light 02d reflected by the total reflection mirror 102d (not shown) enters the same number (four in this example) of condensing lenses 104 as the target 5, and is condensed by each condensing lens 104, and Light is incident on the same number (four in this example) of output prisms 103 as the target 5.
Each laser beam 02a, 02b, 02c, 02d refracted by the refracting surface 103a of the light exiting prism 103 is divided into four parts provided on the exhaust valve 16 and the intake valve 14, respectively, as shown in FIG. The target 5 is irradiated.
Laser light 02 applied to the four targets 5 respectively provided in the exhaust valve 16 and the intake valve 14 generates high-temperature plasma in the mixed gas in the combustion chamber 13 and ignites and burns the gas.

  According to the first embodiment, a plurality of combinations of the half mirror 101 and the total reflection mirror 102 are provided, and the laser light 02 is incident on the upstream half mirror (for example, 101a), thereby the half mirror (for example, 101a). To repeat the procedure of separating the reflected light and transmitted light into one, entering one of the reflected light or transmitted light into the total reflection mirror (eg, 101b) and inputting the other into the downstream half mirror (eg, 101b). Thus, one laser beam 02 is split into a plurality of laser beams (for example, each laser beam 02a, 02b, 02c, 02d) with a very simple structure in which a plurality of pairs of half mirrors 101 and total reflection mirrors 102 are combined. Four targets provided in a plurality of targets in the combustion chamber 13, that is, the exhaust valve 16 and the intake valve 14, respectively. 5 can be irradiated to.

  Thereby, one laser beam 02 is split into a plurality of laser beams (for example, the respective laser beams 02a, 02b, 02c, 02d) by the laser beam spectroscopic device 100, and the targets arranged at a plurality of locations in the combustion chamber 13 5 can be easily irradiated. By irradiating the plurality of targets 5 with the laser beam 02, the plurality of locations in the combustion chamber 13 become the ignition points of the combustion chamber gas, and the combustion chamber gas is evenly ignited, and the occurrence of poor ignition is avoided and the target is avoided. The ignition combustion time for the gas per 51 gas can be shortened, and the ignition combustion performance is improved.

FIG. 2 is a schematic diagram of a laser beam spectrometer according to a second embodiment of the present invention.
In this embodiment, the laser beam spectroscopic device 100 is configured as follows.
That is, in FIG. 2, reference numeral 105 denotes a split prism, which is formed in a pyramid shape (in this example, a quadrangular pyramid), and the laser beam 02 is incident on the apex 105z, and a plurality of (in this example, four) refracting surfaces. Laser beams 02a, 02b, 02c, and 02d dispersed by 105a, 105b, 105c, and 105d are formed to emit light from the refracting surfaces 105a, 105b, 105c, and 105d.
Reference numeral 106 denotes an intermediate prism, and 107 denotes a light output prism, which are arranged in series in the optical path of the laser light 02 in the same number as the target 5 (FIG. 5). Reference numeral 104 denotes a condenser lens installed in the optical path of the laser light between each intermediate prism 106 and each light output prism 107.
The intermediate prism 106 and the light emitting prism 107 are formed with a refracting surface 106a and a refracting surface 107a, respectively, for refracting the laser beam 02 in a right angle direction.

  In the second embodiment, the laser beam 02 introduced from the laser beam cylinder distributor 7 into the laser beam spectrometer 100 through the optical fiber 50 is applied to the split prism 105 from the vertex 105z of the split prism 105 as shown in FIG. Incident light is split by a plurality of (in this example, four) refracting surfaces 105a, 105b, 105c, and 105d, and the number of split laser beams 02a, 02b, 02c, and 02d is the same as the target 5 (four in this example). ) Is incident on the intermediate prism 106.

Laser light (for example, laser light 02d) deflected in a substantially right angle direction by the refracting surface 106a of each intermediate prism 106 enters the same number (four in this example) of condensing lenses 104 as the target 5 and is collected. The light is condensed by the optical lens 104, is incident on the same number (four in this example) of the output prisms 107 as the target 5, and is deflected in a substantially right angle direction by the refracting surface 107a.
In such an embodiment, each of the intermediate prisms 106 and each of the light emitting prisms 107 are arranged in series in the optical path of the laser light 02, so that the laser light 02 emitted from the split prism 105 is directed downward, that is, in the combustion chamber 13 in FIG. As shown in FIGS. 5A and 5B, it is possible to irradiate the four targets 5 provided on the exhaust valve 16 and the intake valve 14 respectively.

According to the second embodiment, one laser beam 02 is incident on the splitting prism 105 from the apex 105z of the pyramidal splitting prism 105 having a plurality of refracting surfaces 105a, 105b, 105c, and 105d. By emitting light from the plurality of refractive surfaces refracting surfaces 105a, 105b, 105c, and 105d through the dividing prism 105, the pyramid-shaped dividing prism 105, each intermediate prism 106, and each light emitting prism 107 are simply installed. With a low-cost structure, one laser beam 02 is split into a plurality of laser beams 02a, 02b, 02c, and 02d and directed to four targets 5 provided on the exhaust valve 16 and the intake valve 14, respectively. Can be emitted.
In addition, since the intermediate prisms 106 and the light output prisms 107 are arranged in series on the downstream side of the pyramid-shaped splitting prism 105 in the optical path of the laser light 02 with the condenser lens 104 interposed therebetween, a plurality of split prisms 105 are provided. The laser beams 02 a, 02 b, 02 c, and 02 d that are spectrally separated can be easily and accurately radiated to the targets 5 arranged at a plurality of locations in the combustion chamber 13.

FIG. 3 is a schematic diagram of a laser beam spectrometer according to a third embodiment of the present invention.
In this embodiment, the laser beam spectroscopic device 100 is configured as follows.
That is, in FIG. 3, reference numeral 105 denotes a pyramid-shaped split prism (in this example, a quadrangular pyramid) similar to that in the second embodiment, and the laser beam 02 is incident on the apex 105z, and a plurality (four in this example). The laser beams 02a, 02b, 02c, and 02d dispersed by the refracting surfaces 105a, 105b, 105c, and 105d are emitted from the refracting surfaces 105a, 105b, 105c, and 105d.
Reference numeral 109 denotes a light output prism which is installed in the optical path of the laser beam 02 in the same number as the target 5 (FIG. 5). Reference numeral 104 denotes a condensing lens installed in the optical path of the laser light between the split prism 105 and each light output prism 109.
A refracting surface 109a that refracts the laser light 02 in a right angle direction is formed on the upper surface of the light output prism 109, and a refracting surface 109b that refracts the laser light from the refracting surface 109a in a right angle direction is formed on the lower surface. .

In the third embodiment, the laser beam 02 is incident on the split prism 105 from the vertex 105z of the split prism 105 as shown in FIG. 3, and a plurality of (four in this example) refracting surfaces 105a, 105b, The laser beams 02a, 02b, 02c, and 02d that have been dispersed by 105c and 105d are condensed by the respective condensing lenses 104 and enter the same number (four in this example) of the output prisms 109 as the targets 5. Lighted.
In each light emitting prism 109, laser light (for example, laser light 02d) deflected in a substantially right angle direction by the upper surface side refracting surface 109a is deflected in a substantially right angle direction by the lower surface side refracting surface 109b.
In such an embodiment, the laser beam 02 emitted from the split prism 105 is dropped downward, that is, toward the combustion chamber 13 in FIG. 5 by the light emitting prisms 109 having the refracting surfaces 109a and 109b formed on the upper and lower surfaces thereof in the horizontal direction. On the other hand, as shown in FIGS. 5A and 5B, it is possible to irradiate the four targets 5 provided on the exhaust valve 16 and the intake valve 14, respectively.

  According to the third embodiment, one laser beam 02 is incident on the split prism 105 from the apex 105z of the pyramidal split prism 105 having a plurality of refractive surfaces refracting surfaces 105a, 105b, 105c, and 105d. By emitting light from the plurality of refracting surfaces 105a, 105b, 105c, and 105d through the split prism 105, one simple and low-cost structure in which only the pyramid-shaped split prism 105 and the light output prism 109 are installed is provided. In addition to being able to split the laser beam 02 into a plurality of laser beams 02a, 02b, 02c, and 02d and to emit light toward the four targets 5 provided on the exhaust valve 16 and the intake valve 14, respectively, the pyramid shape The refraction surfaces 109a and 109b are arranged on the upper and lower surfaces of the splitting prism 105 with the condenser lens 104 interposed therebetween. Since each of the formed light emitting prisms 109 is arranged, the laser beams 02a, 02b, 02c, and 02d split into a plurality of beams by the dividing prism 105 are easily and accurately irradiated to the targets 5 arranged at a plurality of locations in the combustion chamber 13. it can.

FIG. 4 is a schematic diagram of a laser beam spectrometer according to a fourth embodiment of the present invention.
In this embodiment, the laser beam spectroscopic device 100 is configured as follows.
That is, in FIG. 4, a 110 prismatic distribution prism has a plurality of (four in this example) refracting surfaces 110a, 110b, 110c, and 110d that form a pyramid inner surface (in this example, a quadrangular pyramid inner surface). ing. A condensing lens 104 is installed at the laser beam entrance of the distribution prism 110.

  In the fourth embodiment, as shown in FIG. 4, the laser light 02 is introduced into the interior from the upper surface of the distribution prism 110, transmitted through the interior, and a plurality of (four in this example) from the vertex 110z of the inner surface of the quadrangular pyramid. The laser beams 02a, 02b, 02c, and 02d dispersed by the refractive surfaces 110a, 110b, 110c, and 110d are propagated in the horizontal direction, and as shown in FIGS. 5 (A) and 5 (B), The four targets 5 provided on the exhaust valve 16 and the intake valve 14 are irradiated.

  According to the fourth embodiment, one laser beam 02 is refracted by the refracting surfaces 110a, 110b, 110c, 110d from the vertices 105z of the plurality of refracting surfaces 110a, 110b, 110c, 110d on the inner surface of the quadrangular pyramid. Thus, one laser beam 02 is split into a plurality of laser beams 02a, 02b, 02c, and 02d with a simple and low-cost structure in which only one distribution prism 110 having a pyramid surface is provided. Thus, the light can be emitted toward the four targets 5 respectively provided in the exhaust valve 16 and the intake valve 14, so that the laser beams 02 a, 02 b, 02 c, and 02 d that have been split into a plurality of beams by the split prism 105 are emitted into the combustion chamber 13. Irradiation can be easily and accurately performed on the targets 5 arranged at a plurality of locations.

FIG. 6 shows a laser ignition engine in which the laser beam spectrometer 100 according to the first to fourth embodiments is diverted to the laser beam cylinder distributor 7 shown in FIG.
In this case, the laser beam 02 from the laser oscillation device 1 is split by the laser beam spectrometer 100 as in the first to fourth embodiments and distributed to each cylinder. That is, in the laser beam spectroscopic device 100, the laser beam 02 is received by the laser control device 2 from the controller 3, and is distributed to each cylinder according to the ignition sequence. It transmits to the laser beam introducing device 10 of each cylinder.
The laser light condensed by the condenser lens 6 of the laser light introducing device 1 passes through the laser light introducing glass body 35 and is irradiated onto the target 5 in the combustion chamber 13. By irradiation with the laser beam 02, high temperature plasma is generated in the mixed gas in the combustion chamber 13, and the gas is ignited and burned.
Other structures are the same as those in FIG. 5A, and the same members are denoted by the same reference numerals.

  According to the present invention, it is possible to divide a single laser beam into a plurality of parts with a simple structure and to irradiate a plurality of targets in the combustion chamber with a simple structure. It is possible to provide a laser ignition type engine that can split one laser beam into a plurality of beams and distribute the divided laser beams to a plurality of cylinders.

(A) is a schematic diagram of the laser beam spectroscopic device according to the first embodiment of the present invention, and (B) is an operation explanatory diagram. It is a schematic diagram of the laser beam spectrometer concerning 2nd Example of this invention. It is a schematic diagram of the laser beam spectrometer which concerns on 3rd Example of this invention. It is a schematic diagram of the laser beam spectrometer which concerns on 3rd Example of this invention. The 1st example of the single chamber type laser ignition type engine to which this invention is applied is shown, (A) is a whole block diagram, (B) is the plane schematic which shows arrangement | positioning of a target. It is a whole block diagram which shows the 2nd example of the single chamber type laser ignition type engine to which this invention is applied.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Laser oscillation apparatus 2 Laser control apparatus 02 Laser beam 3 Controller 5 Target 7 Laser beam cylinder distribution apparatus 10 Piston 12 Cylinder head 13 Combustion chamber 14 Intake valve 16 Exhaust valve 50 Optical fiber 51 Rotation speed detector 52 Load detector 53 Crank angle sensor DESCRIPTION OF SYMBOLS 100 Laser beam spectrometer 101 Half mirror 102 Total reflection mirror 103,107,109 Output prism 104 Condensing lens 105 Split prism 106 Intermediate prism 110 Distribution prism 160 Laser beam switching apparatus

Claims (8)

  Laser light from the laser oscillation device is transmitted to laser light introducing means mounted on the cylinder head through an optical fiber, and from the laser light introducing means to the gas in the combustion chamber by plasma generated by irradiating the target in the combustion chamber. In a laser ignition type engine configured to ignite, it is configured by combining a half mirror and a total reflection mirror, and the incident laser beam is converted into a plurality of laser beams by passing through the half mirror and the total reflection mirror. A laser ignition type engine equipped with a laser beam splitting device, characterized by comprising a laser beam spectroscopy device for performing spectroscopy.   A plurality of sets of half mirrors and total reflection mirrors are provided so that one of the laser beams transmitted or reflected by the upstream half mirror enters the total reflection mirror and the other enters the downstream half mirror. A laser ignition engine comprising the laser beam splitting device according to claim 1.   Provided in the same number as the plurality of laser beams emitted from the most downstream mirror of the half mirror and total reflection mirror provided in a plurality of sets, and refract each of the plurality of laser beams toward the required light receiving means side 3. A laser ignition type engine equipped with a laser beam splitting device according to claim 2, further comprising a light emitting prism for emitting light. 4. The condensing lens of the same number as the plurality of laser beams emitted from the most downstream mirror is provided in an optical path between the most downstream mirror and the light output prism. 5. A laser ignition engine equipped with a laser beam splitter.   Laser light from the laser oscillation device is transmitted to laser light introducing means mounted on the cylinder head through an optical fiber, and from the laser light introducing means to the gas in the combustion chamber by plasma generated by irradiating the target in the combustion chamber. In a laser ignition engine configured to ignite, the engine has a plurality of refractive surfaces that divide the laser beam incident from a vertex into a plurality of laser beams, and the divided laser beams are directed in different directions. A laser ignition engine provided with a laser beam splitting device, comprising a pyramid-shaped splitting prism for emitting light.   For each of the plurality of laser beams emitted from the split prism, two light output prisms are provided in series on the optical path of the laser light, and each of the plurality of laser beams output from the split prism is replaced with the two light output prisms. 6. A laser ignition type engine equipped with a laser beam splitting device according to claim 5, wherein light is emitted toward a required light receiving means side in order.   For each of a plurality of laser beams emitted from the split prism, an output prism having two refracting surfaces for refracting the laser beam is provided in the optical path of the laser beam, and a plurality of laser beams emitted from the split prism are 6. A laser ignition type engine equipped with a laser beam splitting device according to claim 5, wherein each is configured to emit light toward a required light receiving means through two refractive surfaces of the light emitting prism in order. .   Laser light from the laser oscillation device is transmitted to laser light introducing means mounted on the cylinder head through an optical fiber, and from the laser light introducing means to the gas in the combustion chamber by plasma generated by irradiating the target in the combustion chamber. In the laser ignition type engine configured to ignite, the plurality of divided plurality of refracting surfaces having a plurality of refracting surfaces forming a pyramidal inner surface that divides the laser light incident from an internal vertex into a plurality of laser beams A laser ignition type engine equipped with a laser beam splitting device, characterized by comprising a splitting prism that emits the laser beam in different directions.

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