JP2002276519A - Engine and its operating method - Google Patents

Abstract

PROBLEM TO BE SOLVED: To realize a technology capable of suppressing efficiency reduction or the like and keeping a preferable operating state, in an engine 100 comprising an igniting means 14 for igniting a mixture of fuel G and an oxygen-containing gas that is formed in a combustion chamber 7, a control gas supplying means 20 for supplying the control gas for varying a combustion speed of the mixture, and a combustion speed adjusting means 51 for adjusting the combustion speed of the mixture by adjusting a supply amount of the control gas supplied to the mixture by the control gas supplying means 20. SOLUTION: This engine has an ignition timing adjusting means 52 for adjusting the ignition timing of the igniting means 14 to the delay side for increasing the combustion speed of the mixture by the combustion speed adjusting means 51, or adjusting the ignition timing of the igniting means 14 to the early side for decreasing the combustion speed of the mixture by the combustion speed adjusting means 51.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention comprises an ignition means for igniting a mixture of fuel and oxygen-containing gas formed in a combustion chamber, and a control gas for changing the combustion rate of the mixture is supplied to the mixture. An engine comprising: a control gas supply unit for supplying; and a combustion speed adjusting unit for adjusting a supply amount of the control gas supplied to the air-fuel mixture by the control gas supply unit to adjust a combustion speed of the air-fuel mixture. And its operation method.

[0002]

2. Description of the Related Art The above-described engine supplies fuel to an intake passage or a combustion chamber to form a mixture of fuel and air (an example of an oxygen-containing gas) in the combustion chamber and compresses the mixture. This is a spark ignition type engine that is ignited by a spark plug (an example of ignition means). By providing such a spark ignition type engine with the control gas supply means and the combustion rate adjusting means, the control gas which can be mixed with the air-fuel mixture to change the combustion speed of the air-fuel mixture is used. The combustion rate of the air-fuel mixture in the combustion chamber can be adjusted by adjusting the supply amount of the control gas based on, for example, a combustion load or the like. It is configured to maintain a high efficiency while controlling the production amount of NOx and the like by adjusting to a preferable one suitable for the above.

[0003] Specifically, such an engine performs a high-output operation by setting the equivalence ratio of the air-fuel mixture high, when the temperature of fresh air taken into the combustion chamber is high, or when the humidity of the fresh air is low. When the combustion gas is low, for example, in order to suppress the generation of NOx due to the increase in the combustion speed, the control gas supply amount is adjusted to lower the combustion speed of the air-fuel mixture. Conversely, when performing the low output operation by setting the equivalence ratio of the air-fuel mixture low, when the temperature of the fresh air taken into the combustion chamber is low, or when the humidity of the fresh air is high, the supply of the control gas is performed. The control gas supply means is operated so as to increase the combustion rate of the air-fuel mixture by adjusting the amount and to perform the operation with emphasis on improving the efficiency.

[0004]

However, in such an engine, when the combustion speed of the air-fuel mixture in the combustion chamber changes significantly, the pressure increase process in the combustion chamber, that is, the maximum pressure and its timing, the pressure increase rate, etc. In addition to the change, it becomes a hindrance to high-efficiency operation, and if the change is remarkable, smooth operation cannot be performed. Therefore, the present invention
In view of the above circumstances, in an engine that supplies a control gas, which changes the combustion rate of the mixture, to a mixture formed in the combustion chamber along with a supply amount adjustment, it is possible to suppress a decrease in efficiency and the like, and to achieve a preferable operating state. The aim is to realize a technology that can maintain

[0005]

Means for Solving the Problems [Structure 1] An engine according to the present invention is provided with ignition means for igniting a mixture of fuel and oxygen-containing gas formed in a combustion chamber. A control gas supply means for supplying a control gas for changing the combustion rate of the air-fuel mixture to the air-fuel mixture, and adjusting a supply amount of the control gas supplied to the air-fuel mixture by the control gas supply means; An engine having a combustion speed adjusting means for adjusting a combustion speed of the air-fuel mixture, wherein the ignition timing of the ignition means is adjusted to a later side with respect to an increase in the combustion speed of the air-fuel mixture by the combustion speed adjusting means. And, conversely, with respect to a decrease in the combustion speed of the mixture by the combustion speed adjusting means,
An ignition timing adjusting means for adjusting the ignition timing of the ignition means to a later side is provided.

[Effects] As described in the prior art, the control gas supply means and the combustion rate adjusting means are provided, and the control gas is supplied to the air-fuel mixture in the combustion chamber by adjusting the supply amount of the control gas. In a spark ignition type engine capable of adjusting the combustion speed of air, as in the present configuration, by providing the ignition timing adjustment means, when the combustion speed of the air-fuel mixture is increased by the combustion speed adjustment means, The ignition timing of the mixture is retarded (adjusted to the late side), and when the combustion speed of the mixture is reduced, the ignition timing of the mixture is advanced (adjusted to the earlier side). Can be. Therefore, the change in the pressure rise process of the combustion chamber due to the change in the combustion speed of the air-fuel mixture can be suppressed as much as possible, and the pressure rise process can be made suitable for the combustion load. This can suppress a decrease in efficiency due to the above.

According to a second aspect of the present invention, in the engine according to the second aspect, in addition to the configuration of the engine according to the first aspect, the control gas supply means is supplied to the air-fuel mixture and the combustion speed is increased. Means for supplying an auxiliary combustion gas to the mixture as the control gas.

[Effects] That is, as the control gas which can be mixed with the air-fuel mixture to change the combustion speed of the air-fuel mixture, an auxiliary combustion gas having a higher combustion speed than the fuel can be used. When supplying such an auxiliary gas to the air-fuel mixture by the control gas supply unit, the combustion speed adjusting unit increases the supply amount of the auxiliary gas when increasing the combustion speed, and conversely decreases the combustion speed. When this is done, the supply amount of the auxiliary combustion gas can be reduced. Further, for example, when the fuel is natural gas containing methane as a main component, hydrogen, butane, propane, dimethyl ether (DM
E) or carbon monoxide or the like can be used.

According to a third aspect of the present invention, in addition to the configuration of the engine of the second aspect, the engine according to the present invention further comprises a reforming means for reforming the fuel to generate the auxiliary combustion gas. It is characterized by having.

[Effects] In other words, as described above, when the auxiliary combustion gas is used as the control gas capable of changing the combustion speed of the air-fuel mixture by being mixed with the air-fuel mixture, as described above, the above-described modification is used. Quality means can be provided to generate the auxiliary combustion gas by reforming the fuel. Therefore, there is no need to prepare a separate auxiliary combustion gas, and the engine of the present invention can be easily configured.

[Structure 4] In the engine according to the present invention, in addition to the structure of the engine of Structure 3, the fuel is natural gas and the auxiliary gas is hydrogen-rich gas. It is characterized by.

[Effects] That is, when the above-mentioned auxiliary gas is obtained by reforming natural gas as a fuel, the natural gas is reformed and hydrogen-rich gas (gas containing a large amount of hydrogen) is used as the auxiliary gas. The resulting reforming means can be utilized. Such a reforming means is configured to generate a hydrogen-rich gas by a steam reforming method of reacting a hydrocarbon in natural gas with steam at a reaction temperature of about 500 to 900 ° C. using a catalyst such as nickel. be able to.

According to a fifth aspect of the present invention, in the engine according to the fifth aspect, in addition to the configuration of the engine of the first aspect, the control gas supply means is inert in the combustion chamber. It is a means for supplying a gas as the control gas to the air-fuel mixture.

[Effect] That is, an inert gas which is inert in the combustion chamber can be used as the control gas which can be mixed with the air-fuel mixture to change the combustion speed of the air-fuel mixture. When the mixture supplied with such an inert gas is burned, a part of the heat generated by the combustion is consumed by heating the supplied inert gas. It is mitigated and the combustion rate of the mixture decreases. Then, when supplying the inert gas to the air-fuel mixture in this way, the combustion speed adjusting means decreases the supply amount of the inert gas when increasing the combustion speed, and conversely, when decreasing the combustion speed, It can be configured to increase the supply amount of the inert gas. Further, for example, as the inert gas, steam, exhaust gas, carbon dioxide gas, nitrogen gas, argon gas, helium gas, or the like can be used.

[Structure 6] In the engine according to the present invention, as described in claim 6, in addition to the structure of the engine of the structure 5, the inert gas may be steam.

[Effects] That is, when the above-mentioned inert gas is used as the above-mentioned control gas which can be mixed with the air-fuel mixture to change the combustion speed of the air-fuel mixture, water vapor is used as the inert gas. it can. Since such water vapor can be generated by evaporating easily available water, the engine of the present invention can be realized with a low-cost and simple configuration.

Further, the engine according to the present invention described so far has a main chamber formed in a cylinder and a sub-chamber communicating with the main chamber as the combustion chamber, and the ignition plug is provided in the sub-chamber. Thus, an engine that ignites the air-fuel mixture formed in the sub-chamber and ejects a flame torch or the like into the main chamber can be configured. In the engine configured as described above, the control gas supply unit is configured to supply the control gas to the sub-chamber, and the combustion speed of the air-fuel mixture in the sub-chamber is adjusted by the combustion speed adjustment unit to determine the combustion load or the like. It is possible to suppress the generation amount of NOx in the sub-chamber by adjusting to a preferable one suitable for the above.

[0018]

DESCRIPTION OF THE PREFERRED EMBODIMENTS [First Embodiment] A first embodiment of an engine and an operation method thereof according to the present invention will be described.
This will be described with reference to the drawings. Engine 100 shown in FIG.
Is a cylinder 4, a piston 3 inserted into the cylinder 4,
A main chamber 2 as a combustion chamber is defined by an upper surface of the piston 3, an inner surface of the cylinder 4, and a lower surface of the cylinder head 1. A lean mixture of fuel gas, which is a natural gas-based city gas 13A, and air is introduced into the main chamber 2 through an intake passage 15 and an intake valve 5.

Further, a sub chamber 7 as a cylindrical combustion chamber having an axial direction in the cylinder axis direction is formed in a substantially central portion of the cylinder head 1. A sub-chamber upper metal part 8 is provided in the upper part of the sub-chamber 7, and a sub-chamber base 9 is provided in the lower part. One or a plurality of injection holes 10 are drilled at the tip of the sub-chamber base 9.

A gas chamber 11 is formed in the metal fitting 8 above the sub-chamber. The gas chamber 11 is supplied with a fuel gas G for the sub-chamber, which is a natural gas city gas 13A, through a fuel supply path 12. The fuel is supplied and the upstream side of the fuel supply path 12 is connected to a gas pressure control device (not shown) for controlling the gas pressure. A sub-chamber valve 13 (an example of a fuel supply unit) that is slidable back and forth is provided in the sub-chamber upper metal part 8, and the sub-chamber valve 13 opens and closes between the gas chamber 11 and the sub-chamber 7. .
The sub-chamber 7 is provided with an ignition plug 14 (an example of ignition means) for igniting the air-fuel mixture in the sub-chamber 7.

During the operation of the sub-chamber combustion type engine 100, the pressure of the sub-chamber fuel gas G is set to be higher than the pressure on the upstream side of the intake passage 15 by the gas pressure control device. After being adjusted as described above, the fuel flows into the gas chamber 11 through the fuel supply path 12 in the upper metal fitting 8 of the sub-chamber. The fuel gas G for the sub-chamber flows into the sub-chamber 7 when the sub-chamber valve 13 is opened, and is mixed with the lean gas mixture flowing from the main chamber 2 into the sub-chamber 7. Therefore, an air-fuel mixture having an equivalent ratio within the combustible range is formed in the sub-chamber 7.

On the other hand, in order to achieve high efficiency and low NOx combustion, a mixture of fuel and air in a lean fuel gas state is sucked into the main chamber 2 from the intake passage 15 through the intake valve 5 as fresh air. . When a high voltage is applied to the ignition plug 14 by the control device 50 in conjunction with the rotation of a crankshaft (not shown), the air-fuel mixture in the sub-chamber 7 is ignited and burned by spark discharge from the ignition plug 14. I do. The ignited air-fuel mixture is ejected from the injection hole 10 into the main chamber 2 as a flame torch, and burns the lean air-fuel mixture in the main chamber 2.

The sub-chamber combustion engine 100 is, for example, a four-stroke engine that completes one cycle through an intake stroke, a compression stroke, an expansion stroke, and an exhaust stroke.

Further, in the engine 100, the exhaust passage 1 through which the exhaust gas E is discharged from the main chamber 2 through the exhaust valve 6
6 and the fuel supply passage 1 through which the fuel gas G for the sub-chamber flows.
2 are provided adjacent to each other with a wall portion 30 made of copper or aluminum having good heat transfer therebetween, and the heat of the exhaust gas E is transferred to the fuel supply path 12 side through the wall portion 30. As a result, the fuel supply path 12 can be heated.

Further, the engine 100 is provided with a steam supply means 20 (control gas supply means) for supplying steam, which is a control gas for changing the combustion rate of the mixture, to a mixture formed in the sub-chamber 7 as a combustion chamber. Means). This steam supply means 20
The fuel gas G in the fuel supply passage 12 which is supplied to the sub chamber 7 later
In addition, steam is supplied as an inert gas which is inert in the combustion chamber which is the main chamber 2 and the sub chamber 7. Specifically, the water vapor supply means 20 is connected to the wall 3
0, the fuel supply channel 1 being heated by the exhaust gas E
2 is configured to supply water supplied through the flow control valve 25 to evaporate the water and supply water vapor to the fuel gas G flowing through the fuel supply path 12. Further, the water vapor supply means 20 is provided with the fuel supply path 12 filled with a wool member 22 made of steel or glass. It is configured to evaporate. Further, the fuel supply means 20 is provided with a filter member 21 for removing impurities of the supplied water.

The steam supply means 20 constructed as described above
When the steam is supplied to the fuel gas G in the fuel supply passage 12 and the fuel gas G supplied with the steam is supplied to the sub-chamber 7 and the air-fuel mixture formed in the sub-chamber 7 is burned, Since a part of the heat generated by the heat is consumed by heating the steam, the combustion speed is lower than when only the air-fuel mixture is burned. Therefore, it is possible to suppress an excessive rise in the temperature of the sub chamber 7 particularly at the time of high-power operation, thereby suppressing the generation amount of NOx. Further, at the time when the lean mixture in the main chamber 2 is ignited, Since little steam is supplied to the main chamber 2, the ignition performance in the main chamber 2 can be maintained at a preferable level.

The control device 50 includes a flow control valve 25.
To adjust the supply amount of water supplied to the steam supply means 20 and the supply amount of water vapor to the air-fuel mixture formed in the sub-chamber 7, so that the combustion of the air-fuel mixture in the sub-chamber 7 A combustion speed adjusting means 51 for adjusting the speed is provided.

That is, the control device 50 increases the combustion speed of the air-fuel mixture in the main chamber 2 or the sub-chamber 7 as in the case of increasing the output by increasing the equivalent ratio of the air-fuel mixture formed in the intake passage 15. In this case, the amount of water supplied to the steam supply means 20 is increased by the combustion rate adjusting means 51 in order to suppress the generation of NOx due to the increase in the combustion rate,
An increase in the combustion speed of the air-fuel mixture in the sub chamber 7 is suppressed. Conversely, as in the case where the equivalent ratio of the air-fuel mixture formed in the intake passage 15 is reduced to reduce the output, the main chamber 2 or the sub-chamber 7
When the combustion rate of the air-fuel mixture decreases, the combustion rate adjusting means 51 reduces the amount of water supplied to the steam supply means 20 to suppress a decrease in the combustion rate of the air-fuel mixture in the sub-chamber 7. Therefore, the operation that emphasizes efficiency improvement is performed.

Further, the control device 50 adjusts the ignition timing (spark generation timing) of the ignition plug 14 of the sub-chamber 7 with the adjustment of the combustion speed of the air-fuel mixture formed in the sub-chamber 7 by the combustion speed adjusting means 51. An ignition timing adjusting means 52 for adjusting is provided. The ignition timing adjusting means 52 includes the combustion speed adjusting means 5
When the combustion speed of the air-fuel mixture formed in the sub-chamber 7 is increased by 1, the ignition timing of the ignition plug 14 is retarded, and conversely, the air-fuel mixture formed in the sub-chamber 7 by the combustion speed adjusting means 51. When the combustion speed is reduced, the ignition timing of the ignition plug 14 is advanced.

More specifically, the combustion rate adjusting means 51 increases or decreases the amount of water vapor supplied to the fuel supply path 12,
When decreasing or increasing the combustion speed of the air-fuel mixture in the sub-chamber 7, the ignition timing adjusting means 52 sets the ignition timing to an earlier side with respect to the increase in the supply amount of steam, as shown in FIG. Adjust, and conversely, for a decrease in steam supply,
The ignition timing is adjusted to a later side. As a result, for example, by lowering the combustion speed, the ignition timing can be adjusted to the earlier side with respect to the combustion speed reduction while suppressing the NOx generation amount, so that the efficiency reduction due to the combustion speed reduction can be avoided. Can be maintained at about 33%.

The use of the engine used here is as follows. Output: 4.7 kW Bore diameter: 110 mm Stroke: 106 mm Number of cylinders: 1 Compression ratio: 10 Fuel gas flow rate for sub-chamber: 5.0 L / min Fuel gas flow rate for main chamber: 15.6 L / min Rotational speed: 1200 rpm

In the first embodiment, water vapor is used as a control gas that is not reacted with fuel or the like in the combustion chamber and is inert. Examples of such a control gas include exhaust gas, carbon dioxide gas, nitrogen gas, and argon gas. Gas or helium gas can also be used.

When steam as an inert gas is supplied to the fuel supply passage 12 as in the steam supply means 20, this steam can be obtained from exhaust gas discharged from the combustion chamber. That is, the steam supply means 20
Is configured to directly supply a part of the exhaust gas flowing through the exhaust path 16 to the fuel supply path 12 or to supply water vapor generated by heating water separated from the exhaust gas to the fuel supply path 20. Can be.

[Second Embodiment] Next, a second embodiment of the engine and its operating method according to the present invention will be described with reference to the drawings. The engine 200 shown in FIG.
Except for the configuration of the fuel supply path 12 and the exhaust path 16, etc., the first
Since it is almost the same as the engine 100 of the embodiment, detailed description will be omitted.

The engine 200 reforms the fuel gas G flowing through the fuel supply passage 12 by steam reforming to generate hydrogen gas (hydrogen-rich gas) as an auxiliary gas having better ignitability than the fuel gas G. The reformer 60 includes a reforming device 60 (an example of a reforming device as a control gas supply device). The reforming device 60 uses a catalyst such as nickel at a reaction temperature of about 500 to 900 ° C. to remove hydrocarbons in the fuel gas. It is configured to obtain hydrogen by a steam reforming method of reacting with steam S. Then, the hydrogen is mixed with the fuel gas G supplied via the bypass passage 62, and the fuel gas G supplied with the hydrogen can be supplied to the sub-chamber 7.

The reformer 60 configured as described above supplies hydrogen gas to the air-fuel mixture formed in the sub-chamber 7, and the mixture supplied with hydrogen gas is burned in the sub-chamber 7. Since the combustion speed of the fuel gas is higher than that of the fuel gas G, the combustion speed is higher than when a mixture of only the fuel gas G is combusted. Can be achieved.

Also, the reformer 60
Is generated by a heat exchanger 70 that heats water using heat of exhaust gas E flowing through the exhaust path 16. The steam S generated in the heat exchanger 70 can be partially used in the reformer 60 and the remainder can be used in a cogeneration system or the like.

Further, the exhaust gas E discharged from the heat exchanger 70 is supplied as a heat source to the reformer 60 via the switching valve 37 and the exhaust gas supply path 74.

Further, the combustion speed adjusting means 51 of the control device 50 changes the supply amount of the exhaust gas E as a heat source to be supplied to the reforming device 60 by the switching valve 73, thereby changing the fuel gas in the reforming device 50. By changing the reaction temperature between the hydrocarbons and the steam S to change the ability to generate hydrogen. By changing the reaction temperature in this way, the combustion rate adjusting means 51 changes the supply amount of the hydrogen gas supplied to the fuel gas G in the fuel supply passage 12, and as a result, the combustion of the air-fuel mixture in the sub chamber 7 It is configured to adjust the speed.

Then, the combustion rate adjusting means 51 reduces or increases the supply amount of hydrogen gas to the fuel supply path 12,
When decreasing or increasing the combustion speed of the air-fuel mixture in the sub-chamber 7, the ignition timing adjusting means 52 sets the ignition timing on the earlier side with respect to the decrease in the supply amount of hydrogen gas as shown in FIG. On the contrary, when the supply amount of the hydrogen gas is increased, the ignition timing is adjusted to a later side. result,
For example, by lowering the combustion speed, the ignition timing can be adjusted earlier with respect to the decrease in the combustion speed while the amount of generated NOx is kept low, so that a decrease in the efficiency due to the decrease in the combustion speed can be avoided. %.

In the second embodiment, the fuel gas G in the fuel supply passage 12 is used as control gas supply means for supplying an auxiliary combustion gas for increasing the combustion speed of the air-fuel mixture to the air-fuel mixture formed in the sub-chamber 7. A reformer 60 is provided for supplying hydrogen gas to the fuel gas G by reforming the fuel gas G. However, hydrogen as an auxiliary combustion gas supplied to the engine in a separate system from the natural gas city gas as the fuel gas G is provided separately. A control gas supply means for supplying, for example, butane, propane, dimethyl ether (DME), or carbon monoxide to the fuel supply passage 12 or the sub-chamber 7 may be provided.

In each of the above embodiments, the combustion speed adjusting means 51 and the ignition timing adjusting means 52 are connected to the intake passage 15.
It is also possible to adjust the combustion speed of the air-fuel mixture and the ignition timing of the ignition plug 14 based on the temperature or humidity of the fresh air flowing through the air-fuel mixture. That is, a temperature sensor or a humidity sensor is provided in the intake passage 15, and when a rise in temperature or a decrease in humidity of fresh air such as air supplied to the intake passage 15 is confirmed based on a detection result of each sensor, the sub-chamber 7 and the like Since the combustion speed of the air-fuel mixture formed in the combustion chamber increases, the combustion speed adjusting means 51 is used to suppress an increase in the combustion speed of the air-fuel mixture.
For example, the supply amount of steam S supplied to the fuel supply path 12 is increased, the supply amount of hydrogen gas supplied to the fuel supply path 12 is reduced, and further, the reduction in efficiency due to the reduction in combustion speed is suppressed. To adjust the ignition timing
Adjusts the ignition timing earlier. Conversely, when it is confirmed that the temperature of the fresh air decreases or the humidity rises,
1 is to reduce the supply amount of steam S supplied to the fuel supply path 12, increase the supply amount of hydrogen gas supplied to the fuel supply path 12, and to avoid the occurrence of knocking and the like due to the increase in combustion speed. The ignition timing adjusting means 5
2 adjusts the ignition timing to a later side.

As the fuel that can be used in the engine of the present invention, besides natural gas, any hydrocarbon-based gas fuel such as propane or hydrogen, or a liquid fuel such as gasoline, light oil, heavy oil, or alcohol is used. be able to.

[Brief description of the drawings]

FIG. 1 is a sectional view of a main part showing a combustion chamber and a fuel supply system of an engine according to a first embodiment of the present invention.

FIG. 2 is a graph showing a relationship between a steam supply amount and an ignition timing.

FIG. 3 is a sectional view of a main part showing a combustion chamber and a fuel supply system of an engine according to a second embodiment of the present invention.

FIG. 4 is a graph showing the relationship between the reaction temperature of the reformer and the ignition timing.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 Cylinder head 2 Main chamber 3 Piston 4 Cylinder 5 Intake valve 6 Exhaust valve 7 Sub chamber 12 Fuel supply path 13 Sub chamber valve (fuel supply means) 14 Spark plug 15 Intake path 16 Exhaust path 20 Steam supply means (Control gas supply means) ) 25 Flow control valve 30 Wall (heating means) 50 Control device 51 Combustion rate adjusting means 52 Ignition timing adjusting means 60 Reformer (control gas supply means, reforming means) 70 Heat exchanger 100 Engine 200 Engine G Fuel gas (fuel)

Continued on the front page (51) Int.Cl. ⁷ Identification symbol FI Theme coat II (reference) F02D 21/02 F02D 21/06 21/06 41/02 330K 41/02 330 43/00 301B 43/00 301 301M F02M 21 / 02 L F02M 21/02 N 25/00 G 25/00 25/10 B 25/022 27/02 A 25/032 F02P 5/15 B 25/10 F02M 25/02 A 27/02 B (72) Invention Person Masashi Nishigaki 4-1-2 Hirano-cho, Chuo-ku, Osaka-shi, Osaka Osaka Gas Co., Ltd. (72) Inventor Koji Moriya 4-1-2, Hirano-cho, Chuo-ku, Osaka-shi, Osaka Osaka Gas Co., Ltd. (72) Invention Person Shunsaku Nakai 4-1-2, Hirano-cho, Chuo-ku, Osaka-shi, Osaka F-term (reference) 3G022 AA06 DA01 DA02 EA02 GA00 GA11 3G084 AA04 AA05 BA13 BA17 DA38 FA00 FA02 3G092 AA01 AA06 AA07 AA09 AA17 AB02 AB03 AB03 AB AB05 AB06 AB07 AB08 AB09 AB14 AB15 AB17 AB18 AB20 BA09 BB01 DE02S DE03S DE16S DE17S DE18S EA03 EA04 FA16 FA17 HA00Z HA04Z HC09X 3G301 HA01 HA 04 HA05 HA13 HA15 HA22 HA23 HA24 JA22 JA25 LB04 LB05 MA00 MA11 NE11 NE12 PA00Z PA10Z PC04A PC04Z PE09A

Claims (7)

[Claims] A control gas supply means for igniting an air-fuel mixture of a fuel and an oxygen-containing gas formed in a combustion chamber, and supplying a control gas for changing a combustion rate of the air-fuel mixture to the air-fuel mixture. And a combustion rate adjusting means for adjusting a supply rate of the control gas supplied to the air / fuel mixture by the control gas supply means to adjust a combustion rate of the air / fuel mixture. With respect to an increase in the combustion speed of the air-fuel mixture by the speed adjustment means, the ignition timing of the ignition means is adjusted to a later side, and conversely, with respect to a decrease in the combustion speed of the air-fuel mixture by the combustion speed adjustment means, An engine having an ignition timing adjusting means for adjusting an ignition timing of the ignition means to an earlier side. 2. The control gas supply means for supplying, as the control gas, an auxiliary combustion gas, which has a different combustibility from the fuel and is supplied to the air-fuel mixture to increase the combustion speed, as the control gas to the air-fuel mixture. The engine according to claim 1, wherein 3. The engine according to claim 2, further comprising reforming means for reforming the fuel to generate the auxiliary combustion gas. 4. The engine according to claim 3, wherein said fuel is natural gas, and said auxiliary combustion gas is hydrogen-rich gas. 5. The engine according to claim 1, wherein the control gas supply means is a means for supplying an inert gas that is inert in the combustion chamber to the air-fuel mixture as the control gas. 6. The engine according to claim 5, wherein said inert gas is steam. 7. A control gas supply means for igniting an air-fuel mixture of fuel and oxygen-containing gas formed in a combustion chamber, and supplying a control gas for changing a combustion speed of the air-fuel mixture to the air-fuel mixture. And a combustion rate adjusting means for adjusting a supply rate of the control gas supplied to the air-fuel mixture by the control gas supply means to adjust a combustion speed of the air-fuel mixture. With respect to the increase in the combustion speed of the air-fuel mixture by the combustion speed adjustment means, the ignition timing of the ignition means is adjusted to a later side, and conversely, the combustion speed of the air-fuel mixture is reduced by the combustion speed adjustment means. On the other hand, an engine operating method for adjusting the ignition timing of the ignition means to an earlier side.