JP2002021567A - Premix compression self-ingition engine - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a technique capable of hightening an output of a supercharger 17 to supercharge flesh air sufficiently, even when the supercharger 17 is provided, in this self-ignition engine 100 wherein a premix compression self-ignition operation is carried out to compress a premix mixture comprising fuel and oxygen containing gas to conduct self-ignited combustion in a combustion chamber 7, and wherein rotation of a crank shaft 6 is maintained thereby. SOLUTION: This engine is provided with the supercharger 17 for supplying gas exhausted from the combustion chamber 7 to an exhaust gas turbine 17b provided in an exhaust passage 12, and for supercharging the flesh air sucked into the combustion chamber by an intake compressor 17a connected to the exhaust gas turbine 17b to be provided in an intake passage, and an energy increasing means A for increasing gas energy supplied to the exhaust gas turbine 17b.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a premix compression self-ignition operation in which a premixed gas mixture of fuel and oxygen-containing gas is compressed in a combustion chamber to perform self-ignition combustion, thereby maintaining a crankshaft rotation. The present invention relates to a mixed compression self-ignition engine.

[0002]

2. Description of the Related Art Recently, the concept of a homogeneous charge compression ignition engine that actively utilizes self ignition has been attracting attention.
This kind of homogeneous charge compression ignition engine has been developed for the purpose of preventing the particulates of diesel engines, and has just begun research and development. The ignition type is a self-ignition type using adiabatic compression, similar to a diesel engine. However, instead of injecting fuel into compressed air, air (oxygen-containing) is mainly used as in a spark ignition type engine. A premixed gas of an example of gas) and fuel is formed in the combustion chamber, and the premixed gas is adiabatically compressed to self-ignite combustion, and the rotation of the crankshaft is continued. If this technique is applied to a gas engine, the compression ratio is increased and the lean premixed gas is compressed and ignited, thereby achieving high thermal efficiency and low NOx. Such a premixed compression self-ignition engine raises the temperature of the lean premixed gas by adiabatic compression and self-ignites, and therefore it is necessary to sufficiently compress the premixed gas in the combustion chamber. Therefore, the exhaust gas exhausted from the combustion chamber is supplied to the exhaust gas turbine provided in the exhaust passage to the homogeneous charge compression ignition engine, and is taken into the combustion chamber by the intake compressor connected to the exhaust gas turbine and provided in the intake passage. A supercharger for supercharging fresh air may be provided.

[0003]

However, since the premixed compression ignition engine burns the lean premixed gas, the temperature of the exhaust gas discharged from the combustion chamber is 35 even at full load operation.
As low as about 0 ° C., it has been difficult to efficiently operate a supercharger that utilizes the energy of exhaust gas. Furthermore, when the premixed compression ignition engine is started, the wall temperatures of the intake passage and the combustion chamber are low, and the adiabatic compression cannot be performed until the premixed gas reaches a temperature required for self-ignition. Therefore, in order to compress the premixed gas in the combustion chamber and cause self-ignition, the boost pressure of fresh air in the supercharger is increased, but the energy required to operate the supercharger in the initial operation is increased. Since almost no exhaust gas can be obtained, it has been necessary to perform an operation of compressing and igniting the premixed gas after warming up the engine itself by some method. Therefore, the present invention solves the above-mentioned problems, and increases the output of the supercharger even in the case of having a supercharger in a high-thermal-efficiency, low-NOx premixed compression-ignition engine to sufficiently generate fresh air. The aim is to obtain superchargeable technology.

[0004]

[MEANS FOR SOLVING THE PROBLEMS] [Structure 1] In a homogeneous charge compression ignition engine according to the present invention, gas discharged from the combustion chamber to an exhaust turbine provided in an exhaust passage is provided. And a supercharger connected to the exhaust gas turbine and supercharging fresh air sucked into a combustion chamber by an intake compressor provided in an intake passage to increase energy of gas supplied to the exhaust turbine. An energy increasing means is provided.

[Action and Effect] As in the present configuration, the premixed compression ignition engine provided with the supercharger is provided with the exhaust gas energy increasing means, and the gas such as exhaust gas supplied from the combustion chamber to the exhaust gas turbine is provided. Or by supplying a high energy gas to the exhaust gas to increase the energy of the gas supplied to the exhaust gas turbine, thereby increasing the output of the supercharger. That is, since the premixed compression ignition engine burns the lean premixed gas, the temperature of the exhaust gas discharged from the combustion chamber is as low as about 350 ° C., for example, the low-temperature exhaust gas is discharged by the exhaust gas heating means. Since the exhaust gas whose energy has been increased can be supplied to the exhaust gas turbine by heating to about 500 ° C., the supercharger is operated with high capacity, and the supercharging pressure of air or lean premixed air as fresh air is obtained. Can be raised. Therefore, the pressure of the premixed gas formed in the combustion chamber by utilizing the sufficiently supercharged fresh air rises, and the premixed gas can be sufficiently self-ignited. Can be planned.

According to a second aspect of the present invention, there is provided a homogeneous charge compression ignition engine according to the present invention, wherein the exhaust gas heating means includes a burner. A burner device for burning a fuel supplied to the exhaust gas turbine by burning fuel for use.

[Effects] As in the present configuration, by providing the burner device as the exhaust gas heating means, the gas such as the exhaust gas supplied to the exhaust gas turbine of the supercharger is supplied to the combustion chamber or other fuel. The burner fuel or the like can be burned and heated to increase the energy of the gas supplied to the exhaust gas turbine, and the output of the supercharger can be increased with a simple configuration. A mixed compression auto-ignition engine can be configured.

According to a third aspect of the present invention, there is provided a homogeneous charge compression ignition engine according to the third aspect of the present invention, in addition to the structure of the homogeneous charge compression ignition engine according to the second aspect, further comprising: Fuel for combustion in an upstream passage of the exhaust gas turbine in the exhaust passage, and the burner fuel supplies burned combustion gas to the upstream passage.

According to this configuration, in order to increase the energy of the gas supplied to the exhaust gas turbine by the burner device, the exhaust gas discharged from the combustion chamber flows through the exhaust passage upstream of the exhaust gas turbine. , The burner device can be configured to burn the burner fuel. That is, in the burner device, the burner fuel is supplied to the upstream side flow path, and the burner fuel is burned by utilizing oxygen in gas such as exhaust gas discharged from the combustion chamber, so that the fuel is discharged from the combustion chamber. Heating the gas that is
The burner fuel can add high temperature and high energy gas to the exhaust gas turbine of the turbocharger by adding the exhaust gas after combustion, further increasing the output of the turbocharger and increasing the supercharging pressure of fresh air. Can be raised. In addition, by burning the burner fuel in the exhaust passage, the unburned components in the exhaust gas can also be burned.

[0010] [Structure 4] A premixed compression ignition engine according to the present invention is, in addition to the premixed compression ignition engine according to any one of the constitutions 1 to 3, further characterized in that: A supercharger forcibly rotating a shaft; and a supercharging pressure detecting unit for detecting a supercharging pressure of fresh air in the supercharger, which is detected by the supercharging pressure detecting unit when the operation of the engine is started. The energy increasing means is operated while the forcible operation means is operated until the supercharging pressure reaches a predetermined target supercharging pressure value. It is characterized by including a start-up operation means for performing a mixed compression auto-ignition operation.

[Effects] In starting the premixed compression ignition engine, at the start of operation, the combustion chamber and the intake passage are at a low temperature, and no exhaust gas is discharged from the combustion chamber.
The supercharger cannot be operated immediately after the start of operation, and the homogeneous charge compression ignition operation cannot be performed. Therefore, the homogeneous charge compression ignition engine of the present invention has
First, the starting operation means forcibly rotates the crankshaft, thereby forcibly discharging gas from the combustion chamber to the exhaust path, and increasing the energy of the gas discharged from the combustion chamber by the energy increasing means. Can be supplied to the exhaust gas turbine of the supercharger, and the output of the supercharger is gradually increased. Therefore, for example, a pressure sensor detects the pressure in the downstream flow path of the intake compressor of the supercharger in the intake passage, or detects the rotational speed of the supercharger and estimates the supercharging pressure from the detected rotational speed. When the supercharging pressure reaches a target supercharging pressure value at which the premix compression ignition operation can be performed, the supercharging pressure is detected by the supercharging pressure detecting means. It is possible to form a premixed gas for the homogeneous charge compression ignition operation and shift to the homogeneous charge compression ignition operation. Therefore, even during the start-up operation of the homogeneous charge compression ignition engine, the output of the supercharger can be increased to smoothly shift to the homogeneous charge compression ignition operation.

[Structure 5] According to a fifth aspect of the present invention, in addition to the structure of the premixed compression self-ignition engine according to the fourth aspect, the forcible operation means further comprises: It is an electric motor connected to a crankshaft.

[Effects] As in the present configuration, a motor connected to the crankshaft can be used as the crankshaft forced rotation means, and the output of the supercharger can be reduced during startup operation with a simple configuration. It is possible to realize a premixed compression ignition engine that can increase the number and smoothly shift to the premixed compression ignition operation.

[Structure 6] A premixed compression ignition engine according to the present invention as described in claim 6, in addition to the structure of the premixed compression ignition engine according to the constitution 4, the forcible operation means includes It is a spark ignition operating means for performing a spark ignition operation for spark ignition combustion of the premixed gas compressed in the combustion chamber.

[Effects] As in the present configuration, the spark ignition operation means as the forced operation means is, first, a start-up operation in a state where the warm-up is not sufficiently performed and the premix compression ignition operation is impossible. At that time, a premixed gas having an equivalence ratio capable of spark ignition is taken into the combustion chamber and compressed, and the actual compression ratio at a timing later than TDC, preferably about 10 ° ATDC, is 1
A spark is generated by a spark plug provided in the combustion chamber at a timing of about 7 or 18, and the premixed gas is ignited to perform a spark ignition operation. By performing the spark ignition operation in this manner, the warm-up state of the engine gradually progresses, and the combustion chamber discharges the high temperature exhaust gas after the ignition by the spark ignition, and the energy is increased by the energy increasing means. Premixed compression ignition that increases the output of the turbocharger during start-up operation and enables a smooth transition to premixed compression autoignition operation. Engine can be realized.

[Structure 7] According to a seventh aspect of the present invention, in addition to the structure of the premixed compression self-ignition engine of the fourth aspect, the forcibly operating means comprises It is an injection ignition driving means for performing an injection ignition operation for injecting ignition fuel into fresh air compressed in the combustion chamber to self-ignite.

[0017] As in the present configuration, the injection ignition operation means as the forced operation means first performs combustion during the start-up operation in which the warm-up is not sufficiently performed and the premix compression self-ignition operation is impossible. Fresh air such as air or a lean mixture is taken into the chamber and compressed, and ignition fuel such as light oil is supplied at a timing later than TDC, preferably at a timing when the actual compression ratio of about 10 ° ATDC becomes about 17 or 18. Inject and self-ignite to perform injection ignition operation. By performing the injection ignition operation in this way, the warm-up state of the engine gradually progresses, and the combustion chamber is injected and ignited to discharge high-temperature exhaust gas after combustion, and the energy is increased by the energy increasing means. Premixed compression ignition that increases the output of the turbocharger during start-up operation and enables a smooth transition to premixed compression autoignition operation. Engine can be realized.

[Structure 8] A homogeneous charge compression ignition engine according to the present invention further includes, in addition to the structure of the homogeneous charge compression ignition engine according to Structure 7, the combustion chamber is provided with an ignition temperature equal to or higher than the ignition temperature of the ignition fuel. A heated glow plug may be provided.

In this configuration, by providing a glow plug in the combustion chamber, even when, for example, a natural gas-based city gas having a high ignition temperature is used as the ignition fuel, the fuel is compressed in the combustion chamber in the injection ignition operation. New
The ignition fuel can be injected to reliably ignite, and the homogeneous charge compression ignition engine can be started in a preferable state.

[0020]

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a block diagram showing an embodiment of a homogeneous charge compression ignition engine according to the present invention. As shown in FIG. 1, in the premixed compression ignition engine 100, a premixed air of fuel and air (an example of an oxygen-containing gas) is formed in a cylinder 3 from an intake passage 11 via an intake valve 1. A premixed compression auto-ignition operation is performed in which the air is sucked into the combustion chamber 7, compressed in the combustion chamber 7, and self-ignites.
The reciprocating motion of the piston 4 is transmitted through the connecting rod 5 to the crankshaft 6.
Is output as a rotation. Further, the exhaust gas after combustion is discharged from the combustion chamber 7 to the exhaust passage 12 via the exhaust valve 2. The specifications of the homogeneous charge compression ignition engine 100 are as follows. Bore diameter: φ110 mm x stroke: 106 mm Compression ratio: 18 Rated crankshaft rotation speed: 1200 rpm

The premixed compression ignition engine 100 supplies exhaust gas discharged from the combustion chamber 7 to an exhaust gas turbine 17b provided in the exhaust passage 12, and the exhaust gas turbine 17b
To rotate the intake compressor 17a connected to the exhaust gas turbine 17b and provided in the intake passage 11,
A supercharger 17 that pressurizes air supplied to the intake passage 11 is provided.

The natural gas-based city gas as fuel is supplied to the air pressurized by the supercharger through the flow control valve 8 to form a premixed air in the intake passage 11, and the control device 20 Detects the rotation speed of the crankshaft 6 from the detection result of the crankshaft angle sensor 10 for detecting the angle of the crankshaft 6, and operates the flow control valve 8 while calculating the amount of air to be taken in. And the air ratio of the premixed air taken into the combustion chamber 7 can be set.

Cooling water is supplied to the downstream side of the intake compressor 17a of the intake passage 11 through a flow control valve 14.
A cooler 13 for cooling the pressurized premixed gas is provided,
The control device 20 controls the flow control valve 14 based on the detection result of the temperature sensor 15 provided on the downstream side of the cooler 13 in the intake passage 11 to adjust the cooling amount of the cooler 13 for the premixed air. Then, it is possible to set the temperature of the premixed gas sucked into the combustion chamber 7. For example, the control device 20 uses the detection result of the internal pressure sensor 9 for detecting the internal pressure of the combustion chamber 7,
While detecting the self-ignition timing of the premixed gas in the combustion chamber, the temperature of the premixed gas sucked into the combustion chamber 7 can be set to adjust the self-ignition timing to a preferable one.

Such a homogeneous charge compression ignition engine 10
In the case of 0, the premixed air-fuel mixture needs to be sufficiently compressed in the combustion chamber 7 in order to perform the premixed compression auto-ignition operation for compressively igniting the lean premixed air-fuel mixture. Therefore, the premixed compression ignition engine 100 supercharges the premixed gas into the combustion chamber 7 by the supercharger 17, and the temperature of the exhaust gas discharged from the combustion chamber 7 and flowing through the exhaust passage 12 is changed to the full load operation. Even 35
A supercharger 1 that is as low as 0 ° C and uses the energy of exhaust gas
It is difficult to operate 7 efficiently.

Therefore, in the homogeneous charge compression ignition engine 100 of the present invention, the exhaust gas energy increasing means A for increasing the energy of the exhaust gas supplied to the exhaust gas turbine 17b and increasing the output of the supercharger in the exhaust path 12 is provided. , Natural gas-based city gas as burner fuel, exhaust path 1
2 in the upstream flow path of the exhaust gas turbine 17b,
A burner device 25 is provided for supplying combustion gas to exhaust gas supplied to the exhaust gas turbine 17b and heating the exhaust gas.
More specifically, the burner device 25 is an impact burner that burns and burns fuel for a burner so as to collide with each other, and includes a burner combustion chamber 23 that forms a part of the exhaust passage 12 and has both ends narrowed. A burner nozzle 21 provided in the burner combustion chamber 23, and a spark lot 22 that generates a spark in the vicinity of the ejection direction of the burner nozzle 21. The control device 20 opens and closes the on-off valve 24 and is provided on the burner nozzle 21. In addition to supplying fuel to the plurality of injection holes, the spark lot 22 is operated to ignite the injected fuel for the burner, and a part of oxygen remaining in the exhaust gas is used to convert the fuel into a compact flame. To heat the exhaust gas supplied to the exhaust gas turbine 17b and burn unburned components in the exhaust gas. .

By the burner device 25 as such an exhaust gas energy increasing means A, the low temperature exhaust gas discharged from the combustion chamber 7 is heated to about 500 ° C., and the increased exhaust gas is supplied to the exhaust gas turbine 17b. As a result, the supercharger can be operated with high performance to increase the supercharging pressure of the premixed gas, and the premixed gas can be sufficiently self-ignited in the combustion chamber 7.

Next, the starting operation of the homogeneous charge compression ignition engine 100 of the present invention will be described below. At the start of the operation of the homogeneous charge compression ignition engine 100, at the start of operation, the supercharger 17 cannot be operated because the combustion chamber 7 and the intake passage 11 are at a low temperature and no exhaust gas is discharged from the combustion chamber. Cannot perform the homogeneous charge compression ignition operation. Therefore, the homogeneous charge compression ignition engine 1 of the present invention
00 is provided with start-up operation means 201. The start-up operation means 201
By using the burner device 25 as the exhaust gas energy increasing means A, the output of the supercharger 17 can be increased, and the homogeneous charge compression ignition engine 100 can be started smoothly.

That is, after the operation start command is input to the control device 20, the starting operation means 201 first closes the flow control valve 8 and stops the supply of fuel to the crankshaft 6 while stopping the supply of fuel.
The crankshaft 6 is forcibly rotated at, for example, about 1200 rpm by a motor 30 (an example of a forcible operation means) rotatably provided to forcibly discharge air from the combustion chamber 7 to the exhaust passage 12. Then, in the burner device 25, 1
By burning the burner fuel supplied at 0 L / min and supplying high-temperature combustion gas to the air supplied to the exhaust gas turbine 17b, a high-energy gas is supplied to the exhaust gas turbine 17b. , The supercharger 17
Will gradually increase. Then, the pressure of the intake passage 11 detected by the pressure sensor 16 (an example of the supercharging pressure detecting means) becomes a target supercharging pressure value such that the homogeneous charge compression ignition operation of about 100 kPa can be performed,
By operating the cooler 13, the temperature of the premixed air in the intake path 11 becomes 8
When the temperature reaches about 0 ° C., the flow control valve 8 is operated to inhale a lean premixed air having an air ratio of about 2.5 (equivalent ratio of 0.4) into the combustion chamber 7, and the premixed compressed gas is compressed. It is possible to shift to the ignition operation. After the transition to the homogeneous charge compression auto-ignition operation, the burner device 25 stops or performs the low combustion operation.

[Another Embodiment] <1> In the above-described embodiment, the configuration is described in which the motor 30 is provided as the forcible operation means and the starting operation is performed while the crankshaft 6 is forcibly rotated. As means, as shown in FIG. 2, a spark plug 31 capable of generating a spark can be provided in the combustion chamber 7, and further, a spark ignition operating means 202 can be provided in the control device 20. That is, for example, after the operation start instruction is input, the spark ignition operating means 202 rotates the crankshaft 6 by the motor 30 and adjusts the flow control valve 8 to burn the premixed gas having the equivalent ratio of about 0.6. The air is sucked into the chamber 7 and compressed, and the spark plug 31 is operated at about 10 ° ATDC after TDC to ignite the premixed air and perform the spark ignition operation. Then, the pressure in the intake passage 11 detected by the pressure sensor 16 (an example of the supercharging pressure detecting means) becomes approximately 120 kPa, and the temperature of the premixed air in the intake passage 11 is reduced to approximately 85 ° C. by operating the cooler 13. When the spark plug 31 is turned on, the spark generation by the spark plug 31 is further delayed, and when the self-compression ignition in the vicinity of TDC can be confirmed by the internal pressure sensor 9, the lean state with the air ratio of about 2.5 (equivalent ratio of 0.4) Is sucked into the combustion chamber 7 and the operation shifts to the premix compression ignition operation.

<2> In the above-described embodiment, the configuration has been described in which the motor 30 is provided as the forced operation means and the startup operation is performed while the crankshaft 6 is forcibly rotated.
As shown in FIG. 3, as the forced operation means, a fuel injection valve 32 capable of injecting light oil as ignition fuel into the combustion chamber 7 is provided.
Can be provided. That is, the injection ignition driving means 203
For example, after the operation start instruction is input, the motor 30
The crankshaft 6 is rotated to suck the premixed gas having a lean equivalent ratio into the combustion chamber 7 and compress it.
At a time of about ATDC, an injection ignition operation is performed in which light oil is injected by the fuel injection valve 32 to self-ignite. Then, the pressure of the intake passage 11 detected by the pressure sensor 16 (an example of the supercharging pressure detecting means) becomes about 120 kPa, and the cooler 13 is operated to reduce the temperature of the premixed air in the intake passage 11 to 85 kPa.
° C, the spark generation by the spark plug 31 is further delayed, and when the self-compression ignition near TDC is confirmed by the internal pressure sensor 9, the fuel injection valve 3
The injection of light oil from the fuel cell 2 is stopped, the premixed air in a lean state having an air ratio of about 2.5 (equivalent ratio 0.4) is drawn into the combustion chamber 7, and the operation shifts to the premixed compression ignition operation. As the ignition fuel, it is preferable to use light oil having a relatively low ignition point. Alternatively, the same fuel as the fuel supplied to the combustion chamber during the premixed compression self-ignition operation may be used. However, when a natural gas-based city gas or the like having a high ignition temperature is used as the ignition fuel, it is preferable to provide a glow plug in a region of the combustion chamber 7 where the ignition fuel is injected. The ignition fuel can be reliably injected by injecting the ignition fuel into the fresh air, and the homogeneous charge compression ignition engine can be started in a preferable state. When a glow plug is provided and natural gas-based city gas is used as an ignition fuel, the glow plug is set to 1300K (about 100 K).
0 ° C.) is preferable. Fuel is injected so that the equivalent ratio in the combustion chamber becomes 0.5, and exhaust gas of about 500 ° C. can be discharged from the combustion chamber. The combustion load of the burner device 25 as the means A can be kept low.

<3> In the above embodiment, the combustion gas is supplied to the exhaust gas turbine 17b as exhaust gas energy increasing means A for increasing the energy of the exhaust gas supplied to the exhaust gas turbine 17b and increasing the output of the supercharger. The structure provided with the burner device 25 for supplying the exhaust gas and heating the exhaust gas has been described, but the burner device is configured to indirectly heat the exhaust gas supplied to the exhaust gas turbine by the combustion gas in which the burner fuel burns. An electric heater or the like may be provided as the exhaust gas energy increasing means A instead of the burner device.

<4> As a fuel that can be used in the premixed compression ignition engine of the present invention, city gas is suitable, but any fuel such as gasoline, propane, methanol, and hydrogen can be used.

<5> In producing the premixed gas, the fuel and the gas containing oxygen for combustion of the fuel may be mixed. For example, air is used as the oxygen-containing gas for combustion. Is common. However, as such a gas, it is possible to use, for example, an oxygen-enriched gas having an oxygen component content higher than that of air.

<6> In the above embodiment,
Although described in relation to a so-called four-stroke engine, the present application is applicable to a two-stroke engine.

<7> In the above-described embodiment, the configuration is shown in which the premixed gas for compression ignition combustion in the combustion chamber 7 is formed in the intake passage 11, but separately, the fuel injection is directly injected into the combustion chamber 7. A valve may be provided so that only air is sucked in, fuel is injected at an early stage of an intake stroke or a compression stroke to form a premixed gas in a combustion chamber, and the premixed gas is compressed to self-ignite. .

<8> In the above-described embodiment, the pressure sensor 16 is provided as the supercharging pressure detecting means for detecting the supercharging pressure of the premixed gas in the supercharger 17.
The supercharging pressure detecting means may be configured to estimate the supercharging pressure by a rotation speed detection sensor that detects the rotation speed of the supercharger 17.

[Brief description of the drawings]

FIG. 1 is a schematic configuration diagram showing an embodiment of a homogeneous charge compression ignition engine according to the present invention.

FIG. 2 is a schematic configuration diagram showing another embodiment of the homogeneous charge compression ignition engine according to the present invention.

FIG. 3 is a schematic configuration diagram showing another embodiment of a premixed compression ignition engine according to the present invention.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Intake valve 2 Exhaust valve 3 Cylinder 4 Piston 5 Connecting rod 6 Crankshaft 7 Combustion chamber 8 Flow control valve 9 Internal pressure sensor 10 Crankshaft angle sensor 11 Intake path 12 Exhaust path 13 Cooler 14 Flow control valve 15 Temperature sensor 16 Pressure sensor (Supercharging pressure detecting means) 17 Supercharger 17a Intake compressor 17b Exhaust gas turbine 20 Control device 25 Burner device 30 Motor (forcible operation means) 31 Spark plug 32 Fuel injection valve 202 Spark ignition operation means (Forced operation means) 203 Injection ignition Operating means (forcible operating means) A means for increasing exhaust gas energy

──────────────────────────────────────────────────の Continued on the front page (51) Int.Cl. ⁷ Identification symbol FI Theme coat ゛ (Reference) F02D 23/00 F02D 41/02 351 41/02 351 F02B 37/12 301S (72) Inventor Koji Moriya Osaka Prefecture Osaka Gas Co., Ltd. (72) Inventor Takahiro Sako 4-1-2, Hirano-cho, Chuo-ku, Osaka-shi Osaka Gas Co., Ltd. (72) Inventor Masashi Nishigaki 4-1-2, Hirano-cho, Chuo-ku, Osaka-shi, Osaka 4-1-2, Hirano-cho, Chuo-ku, Osaka-shi, Osaka F-term in Osaka Gas Co., Ltd. (reference) 3G005 DA02 FA05 GB17 GB24 GD09 HA00 HA04 HA05 HA13 JA16 3G023 AA00 AA02 AA05 AA08 AB03 AB06 AB08 AC00 AC01 AC04 AC06 AC07 AD03 AF02 AF03 AG02 3G092 AA00 AA18 AB08 BB01 DB03 HA16Z HC01Z HE01Z HE03Z 3G301 HA00 HA01 HA11 HA22 MA11 PA16Z PC01Z PE01Z PE03Z

Claims (7)

[Claims] 1. A premixed compression self-ignition engine that performs a premixed compression self-ignition operation in which a premixed mixture of fuel and an oxygen-containing gas is compressed in a combustion chamber to perform self-ignition combustion and maintains rotation of a crankshaft. And supplying gas exhausted from the combustion chamber to an exhaust turbine provided in an exhaust passage, and supercharging fresh air sucked into the combustion chamber by an intake compressor connected to the exhaust gas turbine and provided in an intake passage. A homogeneous charge compression ignition engine, comprising: a supercharger that increases the energy of gas supplied to the exhaust turbine. 2. The premixed compression ignition engine according to claim 1, wherein the exhaust gas heating means is a burner device that burns fuel for a burner and heats a gas supplied to the exhaust gas turbine. 3. The burner device burns the burner fuel in an upstream flow passage of the exhaust gas turbine in the exhaust passage, and transfers the combustion gas after the burner fuel burns to the upstream flow passage. The homogeneous charge compression ignition engine according to claim 3, which is supplied. 4. A forcible operating means for forcibly rotating the crankshaft; and a supercharging pressure detecting means for detecting a supercharging pressure of fresh air in the supercharger. Until the supercharging pressure detected by the supercharging pressure detecting means reaches a predetermined target supercharging pressure value, the energy increasing means is operated while the forcibly operating means is operated, and the supercharging pressure is reduced to the target supercharging pressure. The homogeneous charge compression ignition engine according to any one of claims 1 to 3, further comprising a start-up operation unit that performs the homogeneous charge compression ignition operation after the start of the engine. 5. The homogeneous charge compression ignition engine according to claim 4, wherein said forced operation means is an electric motor connected to said crankshaft. 6. The premixed compression ignition engine according to claim 4, wherein the forcible operation means is a spark ignition operation means for performing a spark ignition operation for spark ignition combustion of the premixed gas compressed in the combustion chamber. 7. The injection ignition operation means for performing an injection ignition operation in which self-ignition is performed by injecting ignition fuel into fresh air compressed in the combustion chamber.
A premixed compression ignition engine according to claim 1.