JP5452730B2 - 2ストロークエンジン - Google Patents
2ストロークエンジン Download PDFInfo
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- JP5452730B2 JP5452730B2 JP2012540955A JP2012540955A JP5452730B2 JP 5452730 B2 JP5452730 B2 JP 5452730B2 JP 2012540955 A JP2012540955 A JP 2012540955A JP 2012540955 A JP2012540955 A JP 2012540955A JP 5452730 B2 JP5452730 B2 JP 5452730B2
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- 239000000446 fuel Substances 0.000 claims description 318
- 238000001514 detection method Methods 0.000 claims description 44
- 238000011144 upstream manufacturing Methods 0.000 claims description 12
- 238000013459 approach Methods 0.000 claims description 8
- 239000000203 mixture Substances 0.000 claims description 8
- 230000008016 vaporization Effects 0.000 claims description 2
- 239000007789 gas Substances 0.000 description 113
- 238000002347 injection Methods 0.000 description 46
- 239000007924 injection Substances 0.000 description 46
- 230000009977 dual effect Effects 0.000 description 38
- 239000007788 liquid Substances 0.000 description 22
- 238000002485 combustion reaction Methods 0.000 description 20
- 239000003949 liquefied natural gas Substances 0.000 description 16
- 230000002000 scavenging effect Effects 0.000 description 12
- 239000000295 fuel oil Substances 0.000 description 5
- 230000004043 responsiveness Effects 0.000 description 4
- 239000002828 fuel tank Substances 0.000 description 3
- ATUOYWHBWRKTHZ-UHFFFAOYSA-N Propane Chemical compound CCC ATUOYWHBWRKTHZ-UHFFFAOYSA-N 0.000 description 2
- VNWKTOKETHGBQD-UHFFFAOYSA-N methane Chemical compound C VNWKTOKETHGBQD-UHFFFAOYSA-N 0.000 description 2
- 239000004215 Carbon black (E152) Substances 0.000 description 1
- OTMSDBZUPAUEDD-UHFFFAOYSA-N Ethane Chemical compound CC OTMSDBZUPAUEDD-UHFFFAOYSA-N 0.000 description 1
- LFQSCWFLJHTTHZ-UHFFFAOYSA-N Ethanol Chemical compound CCO LFQSCWFLJHTTHZ-UHFFFAOYSA-N 0.000 description 1
- VGGSQFUCUMXWEO-UHFFFAOYSA-N Ethene Chemical compound C=C VGGSQFUCUMXWEO-UHFFFAOYSA-N 0.000 description 1
- 239000005977 Ethylene Substances 0.000 description 1
- UFHFLCQGNIYNRP-UHFFFAOYSA-N Hydrogen Chemical compound [H][H] UFHFLCQGNIYNRP-UHFFFAOYSA-N 0.000 description 1
- 239000001273 butane Substances 0.000 description 1
- 239000000567 combustion gas Substances 0.000 description 1
- 230000006835 compression Effects 0.000 description 1
- 238000007906 compression Methods 0.000 description 1
- 230000001934 delay Effects 0.000 description 1
- 230000003111 delayed effect Effects 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000004880 explosion Methods 0.000 description 1
- 229930195733 hydrocarbon Natural products 0.000 description 1
- 150000002430 hydrocarbons Chemical class 0.000 description 1
- 238000000034 method Methods 0.000 description 1
- IJDNQMDRQITEOD-UHFFFAOYSA-N n-butane Chemical compound CCCC IJDNQMDRQITEOD-UHFFFAOYSA-N 0.000 description 1
- OFBQJSOFQDEBGM-UHFFFAOYSA-N n-pentane Natural products CCCCC OFBQJSOFQDEBGM-UHFFFAOYSA-N 0.000 description 1
- 230000000149 penetrating effect Effects 0.000 description 1
- 239000001294 propane Substances 0.000 description 1
- 230000003584 silencer Effects 0.000 description 1
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02D—CONTROLLING COMBUSTION ENGINES
- F02D19/00—Controlling engines characterised by their use of non-liquid fuels, pluralities of fuels, or non-fuel substances added to the combustible mixtures
- F02D19/06—Controlling engines characterised by their use of non-liquid fuels, pluralities of fuels, or non-fuel substances added to the combustible mixtures peculiar to engines working with pluralities of fuels, e.g. alternatively with light and heavy fuel oil, other than engines indifferent to the fuel consumed
- F02D19/08—Controlling engines characterised by their use of non-liquid fuels, pluralities of fuels, or non-fuel substances added to the combustible mixtures peculiar to engines working with pluralities of fuels, e.g. alternatively with light and heavy fuel oil, other than engines indifferent to the fuel consumed simultaneously using pluralities of fuels
- F02D19/10—Controlling engines characterised by their use of non-liquid fuels, pluralities of fuels, or non-fuel substances added to the combustible mixtures peculiar to engines working with pluralities of fuels, e.g. alternatively with light and heavy fuel oil, other than engines indifferent to the fuel consumed simultaneously using pluralities of fuels peculiar to compression-ignition engines in which the main fuel is gaseous
- F02D19/105—Controlling engines characterised by their use of non-liquid fuels, pluralities of fuels, or non-fuel substances added to the combustible mixtures peculiar to engines working with pluralities of fuels, e.g. alternatively with light and heavy fuel oil, other than engines indifferent to the fuel consumed simultaneously using pluralities of fuels peculiar to compression-ignition engines in which the main fuel is gaseous operating in a special mode, e.g. in a liquid fuel only mode for starting
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02D—CONTROLLING COMBUSTION ENGINES
- F02D13/00—Controlling the engine output power by varying inlet or exhaust valve operating characteristics, e.g. timing
- F02D13/02—Controlling the engine output power by varying inlet or exhaust valve operating characteristics, e.g. timing during engine operation
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
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- F02B—INTERNAL-COMBUSTION PISTON ENGINES; COMBUSTION ENGINES IN GENERAL
- F02B25/00—Engines characterised by using fresh charge for scavenging cylinders
- F02B25/02—Engines characterised by using fresh charge for scavenging cylinders using unidirectional scavenging
- F02B25/04—Engines having ports both in cylinder head and in cylinder wall near bottom of piston stroke
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
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- F02B—INTERNAL-COMBUSTION PISTON ENGINES; COMBUSTION ENGINES IN GENERAL
- F02B37/00—Engines characterised by provision of pumps driven at least for part of the time by exhaust
- F02B37/12—Control of the pumps
- F02B37/16—Control of the pumps by bypassing charging air
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- F02D13/00—Controlling the engine output power by varying inlet or exhaust valve operating characteristics, e.g. timing
- F02D13/02—Controlling the engine output power by varying inlet or exhaust valve operating characteristics, e.g. timing during engine operation
- F02D13/0203—Variable control of intake and exhaust valves
- F02D13/0215—Variable control of intake and exhaust valves changing the valve timing only
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
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- F02D19/00—Controlling engines characterised by their use of non-liquid fuels, pluralities of fuels, or non-fuel substances added to the combustible mixtures
- F02D19/06—Controlling engines characterised by their use of non-liquid fuels, pluralities of fuels, or non-fuel substances added to the combustible mixtures peculiar to engines working with pluralities of fuels, e.g. alternatively with light and heavy fuel oil, other than engines indifferent to the fuel consumed
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
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- F02D—CONTROLLING COMBUSTION ENGINES
- F02D19/00—Controlling engines characterised by their use of non-liquid fuels, pluralities of fuels, or non-fuel substances added to the combustible mixtures
- F02D19/06—Controlling engines characterised by their use of non-liquid fuels, pluralities of fuels, or non-fuel substances added to the combustible mixtures peculiar to engines working with pluralities of fuels, e.g. alternatively with light and heavy fuel oil, other than engines indifferent to the fuel consumed
- F02D19/0639—Controlling engines characterised by their use of non-liquid fuels, pluralities of fuels, or non-fuel substances added to the combustible mixtures peculiar to engines working with pluralities of fuels, e.g. alternatively with light and heavy fuel oil, other than engines indifferent to the fuel consumed characterised by the type of fuels
- F02D19/0642—Controlling engines characterised by their use of non-liquid fuels, pluralities of fuels, or non-fuel substances added to the combustible mixtures peculiar to engines working with pluralities of fuels, e.g. alternatively with light and heavy fuel oil, other than engines indifferent to the fuel consumed characterised by the type of fuels at least one fuel being gaseous, the other fuels being gaseous or liquid at standard conditions
- F02D19/0647—Controlling engines characterised by their use of non-liquid fuels, pluralities of fuels, or non-fuel substances added to the combustible mixtures peculiar to engines working with pluralities of fuels, e.g. alternatively with light and heavy fuel oil, other than engines indifferent to the fuel consumed characterised by the type of fuels at least one fuel being gaseous, the other fuels being gaseous or liquid at standard conditions the gaseous fuel being liquefied petroleum gas [LPG], liquefied natural gas [LNG], compressed natural gas [CNG] or dimethyl ether [DME]
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
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- F02D41/00—Electrical control of supply of combustible mixture or its constituents
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
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- F02D41/0027—Controlling engines characterised by use of non-liquid fuels, pluralities of fuels, or non-fuel substances added to the combustible mixtures the fuel being gaseous
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- F02D41/00—Electrical control of supply of combustible mixture or its constituents
- F02D41/02—Circuit arrangements for generating control signals
- F02D41/14—Introducing closed-loop corrections
- F02D41/1438—Introducing closed-loop corrections using means for determining characteristics of the combustion gases; Sensors therefor
- F02D41/1439—Introducing closed-loop corrections using means for determining characteristics of the combustion gases; Sensors therefor characterised by the position of the sensor
- F02D41/1441—Plural sensors
- F02D41/1443—Plural sensors with one sensor per cylinder or group of cylinders
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
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- F02D41/00—Electrical control of supply of combustible mixture or its constituents
- F02D41/02—Circuit arrangements for generating control signals
- F02D41/14—Introducing closed-loop corrections
- F02D41/1438—Introducing closed-loop corrections using means for determining characteristics of the combustion gases; Sensors therefor
- F02D41/1444—Introducing closed-loop corrections using means for determining characteristics of the combustion gases; Sensors therefor characterised by the characteristics of the combustion gases
- F02D41/1454—Introducing closed-loop corrections using means for determining characteristics of the combustion gases; Sensors therefor characterised by the characteristics of the combustion gases the characteristics being an oxygen content or concentration or the air-fuel ratio
- F02D41/1458—Introducing closed-loop corrections using means for determining characteristics of the combustion gases; Sensors therefor characterised by the characteristics of the combustion gases the characteristics being an oxygen content or concentration or the air-fuel ratio with determination means using an estimation
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02B—INTERNAL-COMBUSTION PISTON ENGINES; COMBUSTION ENGINES IN GENERAL
- F02B75/00—Other engines
- F02B75/02—Engines characterised by their cycles, e.g. six-stroke
- F02B2075/022—Engines characterised by their cycles, e.g. six-stroke having less than six strokes per cycle
- F02B2075/025—Engines characterised by their cycles, e.g. six-stroke having less than six strokes per cycle two
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
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- F02D—CONTROLLING COMBUSTION ENGINES
- F02D13/00—Controlling the engine output power by varying inlet or exhaust valve operating characteristics, e.g. timing
- F02D13/02—Controlling the engine output power by varying inlet or exhaust valve operating characteristics, e.g. timing during engine operation
- F02D13/028—Controlling the engine output power by varying inlet or exhaust valve operating characteristics, e.g. timing during engine operation for two-stroke engines
- F02D13/0284—Variable control of exhaust valves only
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02D—CONTROLLING COMBUSTION ENGINES
- F02D19/00—Controlling engines characterised by their use of non-liquid fuels, pluralities of fuels, or non-fuel substances added to the combustible mixtures
- F02D19/06—Controlling engines characterised by their use of non-liquid fuels, pluralities of fuels, or non-fuel substances added to the combustible mixtures peculiar to engines working with pluralities of fuels, e.g. alternatively with light and heavy fuel oil, other than engines indifferent to the fuel consumed
- F02D19/0663—Details on the fuel supply system, e.g. tanks, valves, pipes, pumps, rails, injectors or mixers
- F02D19/0686—Injectors
- F02D19/0689—Injectors for in-cylinder direct injection
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- F02D19/00—Controlling engines characterised by their use of non-liquid fuels, pluralities of fuels, or non-fuel substances added to the combustible mixtures
- F02D19/06—Controlling engines characterised by their use of non-liquid fuels, pluralities of fuels, or non-fuel substances added to the combustible mixtures peculiar to engines working with pluralities of fuels, e.g. alternatively with light and heavy fuel oil, other than engines indifferent to the fuel consumed
- F02D19/0663—Details on the fuel supply system, e.g. tanks, valves, pipes, pumps, rails, injectors or mixers
- F02D19/0686—Injectors
- F02D19/0692—Arrangement of multiple injectors per combustion chamber
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- F02D41/00—Electrical control of supply of combustible mixture or its constituents
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- F02D41/14—Introducing closed-loop corrections
- F02D41/1401—Introducing closed-loop corrections characterised by the control or regulation method
- F02D2041/1433—Introducing closed-loop corrections characterised by the control or regulation method using a model or simulation of the system
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- F02D2400/00—Control systems adapted for specific engine types; Special features of engine control systems not otherwise provided for; Power supply, connectors or cabling for engine control systems
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- F02D41/00—Electrical control of supply of combustible mixture or its constituents
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- F02D41/1475—Regulating the air fuel ratio at a value other than stoichiometry
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
- Y02T10/00—Road transport of goods or passengers
- Y02T10/10—Internal combustion engine [ICE] based vehicles
- Y02T10/12—Improving ICE efficiencies
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
- Y02T10/00—Road transport of goods or passengers
- Y02T10/10—Internal combustion engine [ICE] based vehicles
- Y02T10/30—Use of alternative fuels, e.g. biofuels
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- Engineering & Computer Science (AREA)
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- Combustion & Propulsion (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Oil, Petroleum & Natural Gas (AREA)
- Output Control And Ontrol Of Special Type Engine (AREA)
- Electrical Control Of Air Or Fuel Supplied To Internal-Combustion Engine (AREA)
- Combined Controls Of Internal Combustion Engines (AREA)
Description
本願は、2010年10月28日に日本に出願された特願2010−241856号に基づき優先権を主張し、その内容をここに援用する。
一例として、ガス燃料としてLNGを用いる場合、適正な空燃比の範囲は、完全燃焼時の理論空燃比の1〜2倍程度である。
また、この空燃比制御器は、ガスモード運転時に、前記複数のシリンダ内の平均空燃比を算出するとともに、前記複数のシリンダに供給される空気量を調節することにより前記平均空燃比を制御する機能と、各前記シリンダ内の空燃比をそれぞれ算出するとともに、前記排気弁の閉止時機を調節することにより前記空燃比を制御する機能とを有している。
また、前記空燃比制御器は、ガスモード運転時に、前記排気主管空燃比センサの計測値から前記平均空燃比を算出するとともに、前記空気逃し弁の開度を調節することにより前記平均空燃比を制御する機能と、前記排気枝管空燃比センサの計測値から前記空燃比をそれぞれ算出するとともに、前記クランク角検出センサの検出値に基づいて前記排気弁駆動部による前記排気弁の閉止時機を調節することにより前記空燃比を制御する機能と、を有してもよい。
また、前記空気供給管の空気流通方向上流端が前記過給機ブロワの空気出口に連通していてもよい。
図1は本発明の第1の実施形態における2ストロークデュアルフューエル機関の概略図である。本実施形態の2ストロークデュアルフューエル機関101(2ストロークエンジン)において、シリンダライナ1、ハウジング2、空気溜3、シリンダ蓋4、排気弁筺5、ピストン6、ピストン棒7、スタッフィングボックス8、ガス噴射弁11、パイロット噴射弁12、排気弁13、排気弁棒14、及び排気弁駆動部15によって構成される機関本体は、図5に示す2ストロークデュアルフューエル機関100と同等である。図1において、図5に示す2ストロークデュアルフューエル機関100の構成要素と同一の要素については同一の符号を付し、その説明を省略する場合がある。
さらに、空燃比制御器70は、排気枝管空燃比センサ66の計測値(排気枝管54内の空燃比)から、予め実験により得た算出式を用いて計測値に見合う各シリンダライナ1内の空燃比を算出するとともに、クランク角検出センサ68の検出値に基づいて排気弁13の閉止時機を調節するための信号を排気弁駆動部15に送信することにより上記空燃比を制御する機能を有している。
なお、排気主管空燃比センサ65および排気枝管空燃比センサ66は、空燃比を直接計測するセンサであってもよいが、空燃比制御器70が空燃比を算出するための情報を取得するセンサ、すなわち排ガス中の排ガス濃度(例えばO2濃度)を計測するセンサであってもよい。
さらに、空燃比制御器70は、排気枝管空燃比センサ66の計測値から、予め実験により得た算出式を用いて計測値に見合う各シリンダライナ1内の空燃比を算出するとともに、この空燃比が1.0〜2.5の範囲になるように、クランク角検出センサ68の検出値に基づいて、排気弁13の閉止時機を調節する信号を排気弁駆動部15に送信する機能を有している。
なお、上記空燃比(上記平均空燃比)は、シリンダライナ1内における混合気の空燃比(一般的な空燃比)を理論空燃比で割った比率(空気過剰率)である。すなわち、シリンダライナ1内の空燃比(一般的な空燃比)を適切に制御するために、空気過剰率を制御指標として用いている。
図4は本発明の第2の実施形態における2ストロークデュアルフューエル機関の概略図である。本実施形態の2ストロークデュアルフューエル機関102(2ストロークエンジン)において、シリンダライナ1、ハウジング2、空気溜3、シリンダ蓋4、排気弁筺5、ピストン6、ピストン棒7、スタッフィングボックス8、ガス噴射弁11、パイロット噴射弁12、排気弁13、排気弁棒14、及び排気弁駆動部15によって構成される機関本体は、図5に示す2ストロークデュアルフューエル機関100と同等である。図4において、図5に示す2ストロークデュアルフューエル機関100または図1に示す2ストロークデュアルフューエル機関101の構成要素と同一の要素については同一の符号を付し、その説明を省略する場合がある。
さらに、空燃比制御器74は、排気枝管空燃比センサ66の計測値(排気枝管54内の空燃比)から、予め実験により得た算出式を用いて計測値に見合う各シリンダライナ1内の空燃比を算出するとともに、クランク角検出センサ68の検出値に基づいて排気弁13の閉止時機を調節するための信号を排気弁駆動部15に送信することにより上記空燃比を制御する機能を有している。
さらに、空燃比制御器74は、排気枝管空燃比センサ66の計測値から、予め実験により得た算出式を用いて計測値に見合う各シリンダライナ1内の空燃比を算出するとともに、この空燃比が1.0〜2.5の範囲になるように、クランク角検出センサ68の検出値に基づいて、排気弁13の閉止時機を調節する信号を排気弁駆動部15に送信する機能を有している。
なお、上記空燃比(上記平均空燃比)は、シリンダライナ1内における混合気の空燃比(一般的な空燃比)を理論空燃比で割った比率である。
また、上述した実施の形態では、空燃比制御器は、算出された平均空燃比が特定の数値に近付くように、空気逃し弁の開度を拡げているが、使用する可燃性ガスに応じて空気逃し弁の開度を狭めるように制御してもよい。また、空燃比制御器は、算出された空燃比が特定の数値範囲になるように、排気弁駆動部による排気弁の閉止時機を遅らせているが、使用する可燃性ガスに応じて排気弁の閉止時機を早めるように制御してもよい。
13 排気弁
15 排気弁駆動部
51 排気主管
52 過給機
54 排気枝管
55 タービン(過給機タービン)
56 ブロワ(過給機ブロワ)
60 ブロワ出口管(空気供給管)
62 空気逃し管
63 空気逃し弁
65 排気主管空燃比センサ
66 排気枝管空燃比センサ
68 クランク角検出センサ
70 空燃比制御器
71 空気逃し管
72 空気逃し弁
74 空燃比制御器
101 2ストロークデュアルフューエル機関(2ストロークエンジン)
102 2ストロークデュアルフューエル機関(2ストロークエンジン)
A 空気
G 排気
Claims (5)
- 可燃性ガスを主燃料に用いるガスモード運転を少なくとも実行可能な2ストロークエンジンにおいて、
複数のシリンダと、
前記複数のシリンダにそれぞれ設けられる排気弁と、
空燃比制御器と、を備え、
該空燃比制御器は、ガスモード運転時に、
前記複数のシリンダ内における混合気の空燃比を理論空燃比で割った比率である平均空燃比を算出するとともに、前記複数のシリンダに供給される空気量を調節することにより前記平均空燃比を制御する機能と、
各前記シリンダ内の空燃比をそれぞれ算出するとともに、前記排気弁の閉止時機を調節することにより前記空燃比を制御する機能と、を有し、
前記可燃性ガスとして、LNGを気化させたガスを用い、
前記空燃比制御器は、前記平均空燃比が1.5に近付くように前記複数のシリンダに供給される空気量を調節するとともに、算出された前記空燃比が1.0〜2.5の範囲になるように前記排気弁の閉止時機を調節する2ストロークエンジン。 - 前記複数のシリンダにそれぞれ接続される排気枝管と、
前記複数のシリンダから送出される排気を前記排気枝管を介して集める排気主管と、
前記排気弁を開閉する排気弁駆動部と、
前記複数のシリンダに空気を供給する空気供給管に、空気流通方向上流端が連通している空気逃し管と、
前記空気逃し管に組み込まれた空気逃し弁と、
前記排気主管内の空燃比を計測する排気主管空燃比センサと、
各前記排気枝管内の空燃比をそれぞれ計測する排気枝管空燃比センサと、
クランク角度を検出するクランク角検出センサと、をさらに備え、
前記空燃比制御器は、ガスモード運転時に、
前記排気主管空燃比センサの計測値から前記平均空燃比を算出するとともに、前記空気逃し弁の開度を調節することにより前記平均空燃比を制御する機能と、
前記排気枝管空燃比センサの計測値から前記空燃比をそれぞれ算出するとともに、前記クランク角検出センサの検出値に基づいて前記排気弁駆動部による前記排気弁の閉止時機を調節することにより前記空燃比を制御する機能と、を有している請求項1に記載の2ストロークエンジン。 - 前記排気主管に集められた排気のエネルギーを回転運動に変換する過給機タービンと、
前記過給機タービンにより駆動され且つ空気を昇圧させて前記複数のシリンダに供給する過給機ブロワと、をさらに備え、
前記空気供給管の空気流通方向上流端が前記過給機ブロワの空気出口に連通している請求項2に記載の2ストロークエンジン。 - 前記空気逃し管の空気流通方向下流端が前記過給機ブロワの空気入口に連通している請求項3に記載の2ストロークエンジン。
- 前記空気逃し管の空気流通方向下流端が前記過給機タービンの排気入口に連通している請求項3に記載の2ストロークエンジン。
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