WO2009078260A1 - マイクロパイロット噴射式ガスエンジン - Google Patents
マイクロパイロット噴射式ガスエンジン Download PDFInfo
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- WO2009078260A1 WO2009078260A1 PCT/JP2008/071592 JP2008071592W WO2009078260A1 WO 2009078260 A1 WO2009078260 A1 WO 2009078260A1 JP 2008071592 W JP2008071592 W JP 2008071592W WO 2009078260 A1 WO2009078260 A1 WO 2009078260A1
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- Prior art keywords
- engine
- gas
- valve
- cylinder
- fuel
- Prior art date
Links
- 238000002347 injection Methods 0.000 title claims abstract description 30
- 239000007924 injection Substances 0.000 title claims abstract description 30
- 238000002485 combustion reaction Methods 0.000 claims abstract description 95
- 239000007789 gas Substances 0.000 claims abstract description 82
- 239000000446 fuel Substances 0.000 claims abstract description 51
- 239000002737 fuel gas Substances 0.000 claims abstract description 23
- 238000001514 detection method Methods 0.000 claims description 34
- 239000007788 liquid Substances 0.000 claims description 5
- 238000003745 diagnosis Methods 0.000 abstract description 5
- 238000000034 method Methods 0.000 description 11
- 239000000203 mixture Substances 0.000 description 8
- 241001634822 Biston Species 0.000 description 2
- FFGPTBGBLSHEPO-UHFFFAOYSA-N carbamazepine Chemical compound C1=CC2=CC=CC=C2N(C(=O)N)C2=CC=CC=C21 FFGPTBGBLSHEPO-UHFFFAOYSA-N 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 230000002159 abnormal effect Effects 0.000 description 1
- 230000007423 decrease Effects 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 239000007921 spray Substances 0.000 description 1
- 238000011144 upstream manufacturing Methods 0.000 description 1
Classifications
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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
- F02B19/00—Engines characterised by precombustion chambers
- F02B19/10—Engines characterised by precombustion chambers with fuel introduced partly into pre-combustion chamber, and partly into cylinder
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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
- F02D41/00—Electrical control of supply of combustible mixture or its constituents
- F02D41/02—Circuit arrangements for generating control signals
- F02D41/04—Introducing corrections for particular operating conditions
- F02D41/06—Introducing corrections for particular operating conditions for engine starting or warming up
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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
- F02B77/00—Component parts, details or accessories, not otherwise provided for
- F02B77/08—Safety, indicating, or supervising devices
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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
- F02B77/00—Component parts, details or accessories, not otherwise provided for
- F02B77/08—Safety, indicating, or supervising devices
- F02B77/085—Safety, indicating, or supervising devices with sensors measuring combustion processes, e.g. knocking, pressure, ionization, combustion flame
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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
- F02D19/02—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 gaseous fuels
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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
- F02D19/0602—Control of components of the fuel supply system
- F02D19/0607—Control of components of the fuel supply system to adjust the fuel mass or volume flow
- F02D19/061—Control of components of the fuel supply system to adjust the fuel mass or volume flow by controlling fuel injectors
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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
- F02D19/0623—Failure diagnosis or prevention; Safety measures; Testing
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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
- F02D19/0626—Measuring or estimating parameters related to the fuel supply system
- F02D19/0628—Determining the fuel pressure, temperature or flow, the fuel tank fill level or a valve position
- F02D19/0631—Determining the fuel pressure, temperature or flow, the fuel tank fill level or a valve position by estimation, i.e. without using direct measurements of a corresponding sensor
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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
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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
- F02D35/00—Controlling engines, dependent on conditions exterior or interior to engines, not otherwise provided for
- F02D35/02—Controlling engines, dependent on conditions exterior or interior to engines, not otherwise provided for on interior conditions
- F02D35/023—Controlling engines, dependent on conditions exterior or interior to engines, not otherwise provided for on interior conditions by determining the cylinder pressure
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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
- F02D41/00—Electrical control of supply of combustible mixture or its constituents
- F02D41/0025—Controlling engines characterised by use of non-liquid fuels, pluralities of fuels, or non-fuel substances added to the combustible mixtures
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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
- F02D41/00—Electrical control of supply of combustible mixture or its constituents
- F02D41/0025—Controlling engines characterised by use of non-liquid fuels, pluralities of fuels, or non-fuel substances added to the combustible mixtures
- 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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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02D—CONTROLLING COMBUSTION ENGINES
- F02D41/00—Electrical control of supply of combustible mixture or its constituents
- F02D41/008—Controlling each cylinder individually
- F02D41/0087—Selective cylinder activation, i.e. partial cylinder operation
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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
- F02D41/00—Electrical control of supply of combustible mixture or its constituents
- F02D41/02—Circuit arrangements for generating control signals
- F02D41/04—Introducing corrections for particular operating conditions
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02D—CONTROLLING COMBUSTION ENGINES
- 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
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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
- 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
- F02D41/1473—Introducing closed-loop corrections using means for determining characteristics of the combustion gases; Sensors therefor characterised by the regulation method
- F02D41/1475—Regulating the air fuel ratio at a value other than stoichiometry
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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
- F02D41/00—Electrical control of supply of combustible mixture or its constituents
- F02D41/30—Controlling fuel injection
- F02D41/3011—Controlling fuel injection according to or using specific or several modes of combustion
- F02D41/3017—Controlling fuel injection according to or using specific or several modes of combustion characterised by the mode(s) being used
- F02D41/3035—Controlling fuel injection according to or using specific or several modes of combustion characterised by the mode(s) being used a mode being the premixed charge compression-ignition mode
- F02D41/3041—Controlling fuel injection according to or using specific or several modes of combustion characterised by the mode(s) being used a mode being the premixed charge compression-ignition mode with means for triggering compression ignition, e.g. spark plug
- F02D41/3047—Controlling fuel injection according to or using specific or several modes of combustion characterised by the mode(s) being used a mode being the premixed charge compression-ignition mode with means for triggering compression ignition, e.g. spark plug said means being a secondary injection of fuel
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
- F02M21/00—Apparatus for supplying engines with non-liquid fuels, e.g. gaseous fuels stored in liquid form
- F02M21/02—Apparatus for supplying engines with non-liquid fuels, e.g. gaseous fuels stored in liquid form for gaseous fuels
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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
Definitions
- an ignition flame generated by combustion of fuel gas injected into a sub chamber from a fuel injection valve provided in the sub chamber is jetted into a main combustion chamber through a communication hole, and the premixed mixing of the main combustion chamber is performed.
- the present invention relates to an air-fuel ratio control means at the time of start-up by controlling the opening and closing of a gas on-off valve in a mic mouth pie-mouth injection type gas engine in which air is combusted.
- a gas engine is pre-mixed with fuel gas and air, sent to the main combustion chamber, and ignited and combusted by an ignition flame generated by an ignition device such as a microphone opening pilot injection type equipped with a fuel injection valve. Due to air-fuel mixture combustion, engine startability is difficult compared to other engines, and therefore main means are used to improve startability.
- FIG. 5 is a flowchart showing an example of a method for starting a microphone mouth pie-mouth injection gas engine according to the prior art. The starting method of the micropilot injection gas engine will be described with reference to FIG.
- step (2) when a start command is issued from the engine control unit (step (1)), the engine first performs a 1/2 skip fire intermittent operation (step (2)).
- the intermittent operation (1/2) in (A) is the ignition operation with fuel supply (1 in Fig. 3 (1)) and the non-ignition operation with the fuel cut off (Fig. 3). 3 Repeat (0) of (1) alternately for each cycle, and repeat the change from ignition to non-ignition in the main combustion chamber.
- ignition operation with fuel supply (1 in Fig. 3 (2)) and non-ignition operation with fuel cut off (0 in Fig. 3 (2)) are performed in 5 cycles. Repeat each cycle so that a non-ignition operation (0 in Fig. 4 (2)) enters. In other words, The main combustion chamber is repeatedly ignited 4 times to 1 time of non-ignition.
- step (8) a 3-minute warm-up operation is performed using a timer (steps (4) and (5)).
- the rotation is increased to 90% (90% N) of the starting rotational speed (step (6)).
- the operation shifts to the 1/5 skip fire intermittent operation, and the number of times of fuel supply (the skip fire is once every 5 times) is increased (step (7)).
- the rotation is increased to 100% (100% N) of the starting rotation speed (step (8)).
- Patent Document 1 Japanese Patent Application Laid-Open No. 9-14057 includes a fuel supply passage that communicates with the main combustion chamber and a sub fuel supply passage that communicates with the sub chamber.
- a slow open valve that opens as soon as the start operation starts, increases the valve opening in proportion to the passage of time and opens fully, and opens the slow open valve. The startability is improved by maintaining the fuel ratio within the combustible range for a certain period of time.
- the 4-cycle gas engine needs to bring the mixture ratio of the fuel gas and air in the main combustion chamber, that is, the air-fuel ratio close to the theoretical mixture ratio.
- the required amount of gas is small, while the amount of air in the main combustion chamber is determined by the piston stroke volume, so that there is a large amount of air, that is, the air-fuel ratio increases.
- the electric ignition method using ignition A gas engine employs a method of reducing the supply air amount by constricting the air supply line, but such a method cannot be employed in a micropilot injection type gas engine.
- the amount of fuel gas at the time of starting (that is, the fluctuation of the fuel gas) is interwoven with the 1 Z 2 skip fire intermittent operation and the 1-5 skip skip intermittent operation by the method shown in FIG.
- the air-fuel ratio at the start is controlled.
- the present invention incorporates the engine operating state into the intermittent operation at the time of start-up in the microphone mouth pie-mouth injection type gas engine, and highly accurately controls the air-fuel ratio at the time of start-up.
- An object of the present invention is to provide a micro pie-mouth injection gas engine that can shorten or eliminate the warm-up operation time.
- the present invention achieves such an object.
- the fuel gas and air from the fuel gas passage are premixed and fed into the main combustion chamber, and are generated by the combustion of liquid fuel injected from the fuel injection valve into the sub chamber.
- a mic opening pie-mouth injection type gas engine in which an ignition flame is jetted into the main combustion chamber through a communication hole connecting the sub chamber and the main combustion chamber to burn the premixed gas mixture in the main combustion chamber.
- Fuel gas passage to each cylinder A gas on / off valve configured to freely change the passage area and the opening / closing period of the fuel gas passage, a rotation speed detector for detecting the engine speed, and the cylinder pressure of each cylinder of the engine A combustion diagnostic device that detects the combustion state of the engine, and a valve intermittent operation control device that is operated by the engine rotational speed input from the rotational speed detector and that operates according to the engine rotational speed.
- the gas on / off valve is opened / closed according to the detected value of the engine speed, and the empty of each cylinder is based on the detected waveform of the combustion state detected value for each cylinder from the combustion diagnostic device.
- the gas on-off valve is intermittently opened / closed at an opening / closing pitch such that the fuel ratio becomes a target value (Claim 1).
- the valve intermittent operation control device sequentially opens and closes the gas on / off valves of the respective cylinders so that the air-fuel ratio becomes a target value (Claim 2).
- a target value (Claim 2).
- the gas on-off valve is intermittently opened and closed at the first pitch, and when all of the detected waveforms have reached the target value, the gas on-off valve is intermittently opened and closed at the second pitch, which has a higher opening ratio than the first pitch. Item 3).
- the gas on-off valve provided in the fuel gas passage to each cylinder and configured to freely change the passage area and the opening / closing period of the fuel gas passage, and the rotational speed detector for detecting the engine rotational speed
- a combustion diagnostic device that detects the combustion state of each cylinder from the in-cylinder pressure of each cylinder of the engine, and a valve intermittent operation control that operates according to the engine speed when the engine speed is input from the speed detector
- the valve intermittent operation control device intermittently opens and closes the gas on / off valve according to the detected value of the engine speed when the gas engine is started, and each cylinder from the combustion diagnostic device Based on the detection waveform of the combustion state detection value, the gas on-off valves are intermittently opened and closed at an open / close pitch such that the air-fuel ratio of each cylinder reaches the target value (Claim 1).
- the gas on / off valve opens and closes at a predetermined opening / closing pitch in the main combustion chamber, so that the amount of gas fluctuation between ignition and non-ignition, for example, 1 to 2 skip fire intermittent operation
- the pressure wave is generated.
- operation control apparatus is each engine of the said combustion diagnostic apparatus.
- the combustion state of each cylinder is detected from the in-cylinder pressure of the cylinder, the combustion state is determined from the state of the detected waveform based on the detected waveform of the detected combustion state value for each cylinder, and the air-fuel ratio that matches the detected waveform Therefore, when the open / close pitch of the gas open / close valve, for example, between 1/2 skip fires, the number of cycles of ignition to non-ignition is determined, and the open / close pitch is intermittently opened / closed.
- the gas on-off valve is always supplied with the detection waveform of the combustion state detection value from the combustion diagnostic device to the valve intermittent operation control device, and the combustion state detection value from the combustion diagnostic device.
- the air-fuel ratio control at the time of starting is made more precise by setting the opening / closing pitch of the gas on-off valve.
- the above high-precision control eliminates the need for warm-up operation and shortens the engine start time.
- the valve intermittent operation control device intermittently opens the gas on-off valve at the first pitch.
- the detected waveforms reach the target value, they are intermittently opened and closed at the second pitch having a higher opening ratio than the first pitch (Claim 3).
- an ignition operation is performed by supplying fuel (Fig. 3 (1)). 1)) and non-ignition operation with fuel cut off (0 in Fig. 3 (1)) are repeated alternately in each cycle.
- the opening ratio is higher than the first pitch, and the second pitch, for example, 1 to 5 skip fires.
- the gas valve is opened and closed intermittently by intermittent operation.
- FIG. 1 is an overall configuration diagram of a four-cycle gas engine according to an embodiment of the present invention.
- FIG. 2 is a flowchart showing an example of a starting method of the micropilot injection type gas engine according to the embodiment of the present invention.
- FIG. 3 is an arrangement table for each cylinder of the starting operation of the micro pie-mouth injection gas engine.
- Fig. 4 shows an example of the detection result of the combustion diagnostic device.
- FIG. 5 is a flowchart showing an example of a method for starting a micro pie-mouth spray type gas engine according to the prior art.
- FIG. 1 is an overall configuration diagram of a four-cycle gas engine according to an embodiment of the present invention.
- the engine (gas engine) indicated by the reference numeral 100 is a micro pi-split four-cycle gas engine, and is a biston that is slidably fitted in a cylinder 100 a. 1 0 2, a main combustion chamber 1 0 1 defined between the upper surface of the biston 1 0 2 and the inner surface of the cylinder 1 0 2 a, an intake port 1 0 3 connected to the main combustion chamber 1 0 1 And intake valves 10 4 for opening and closing the intake ports 10 3.
- 1 0 6 is a cylinder head.
- a gas mixer 1 10 is installed upstream of the intake port 10 3, and the fuel gas supplied through the fuel gas pipe 10 9 and air are premixed by the gas mixer 1 10. Then, the flow rate of the premixed mixture is adjusted by opening control of the throttle valve (not shown), reaches the intake valve 10 4 through the intake port 10 3, and opens the intake valve 10 4. The main combustion chamber 10 1 is supplied.
- 1 is a gas on-off valve, which automatically adjusts the passage area and opening / closing period of the fuel gas pipe 10 9. It is configured so that it can be changed.
- Reference numeral 10 denotes a sub-chamber base, in which a sub-chamber 12 is formed.
- 14 is a nozzle holder, and a fuel injection valve 13 is installed inside the nozzle holder 14.
- 15 is a liquid fuel (light oil) inlet pipe, and the liquid fuel reaches the fuel injection valve 13 from the inlet pipe 15.
- liquid fuel is injected from the fuel injection valve 13 into the premixed mixture introduced into the sub chamber 12 through the communication hole 11 from the main combustion chamber 101 in the intake stroke.
- the ignition flame generated by the combustion burns and recirculates to the main combustion chamber 10 1 through the communication hole 11 to burn the premixed gas mixture in the main combustion chamber 10 1.
- the above configuration is the same as that of a conventional micropilot injection type gas engine.
- the present invention relates to improvement of startability in such a gas engine.
- the gas on-off valve 1 is configured such that the passage area and the on-off period of the fuel gas pipe 109 can be freely changed.
- Reference numeral 2 denotes a valve opening / closing operation control device that opens and closes the gas opening / closing valve 1.
- the valve opening / closing operation control device 2 includes a rotational speed detector 4 for detecting the rotational speed of the engine 100 and a combustion diagnostic device 3 for detecting the combustion state of each cylinder from the in-cylinder pressure of each cylinder of the engine. The diagnosis result is input.
- An in-cylinder pressure detector 5 detects the in-cylinder pressure of each cylinder of the engine.
- An in-cylinder pressure detection signal from the in-cylinder pressure detector 5 is input to the combustion diagnostic device 3.
- FIG. 2 is a flow chart showing an example of a starting method of the micro pie-mouth injection gas engine according to the embodiment of the present invention
- FIG. The arrangement table, Fig. 4 shows an example of the detection result of the combustion diagnostic device.
- step (1) when the engine controller issues a perturbation command (step (1)), the engine first performs a one-step and two-skip fire intermittent operation (step (2)).
- the intermittent operation is the 12 skip fire intermittent operation shown in Fig. 3 (A), and the ignition operation with fuel supply (1 in Fig. 3 (1)) and the non-ignition operation with the fuel shut off. Rotation (0 in Fig. 3 (1)) is repeated alternately for each cycle, and ignition in the main combustion chamber Repeat the fluctuation of non-ignition.
- step (2) while performing the 1/2 skip fire intermittent operation (step (2)), the engine speed is increased to 90% (90% N) of the preset starting speed N (idling speed) (step ( 6)).
- the combustion state of the engine 100 is measured from the data from the combustion diagnostic device 3 with this 90% N (step (11)).
- the valve intermittent operation control device 2 detects the combustion state of each cylinder from the cylinder pressure detector 5 of each cylinder of the engine in the combustion diagnostic device 3, and generates a detection waveform of the combustion state detection value for each cylinder. Based on the state of the detected waveform, the combustion state is determined. In other words, this is the case where the in-cylinder pressure shown in A of FIG. 4 is the normal in-cylinder pressure (pressure P 1). On the other hand, if the in-cylinder pressure (pressure P0) decreases as shown in Fig. 4B, it is judged as abnormal.
- the in-cylinder pressure shown in A of FIG. 4 is a normal in-cylinder pressure (pressure P 1), shifts to the 1/5 skip-fire intermittent operation, Increase fuel supply (skipfire once every 5th) (step (12)).
- the gas fluctuation is performed by changing the interval between ignition and non-ignition between 1 and 2 skip fires at the intermittent opening / closing pitch of the gas switching valve 1 so that the air-fuel ratio conforms to the detection waveform in the combustion diagnostic device 3.
- the air-fuel ratio at the time of start-up is controlled by generating a certain amount of pressure waves.
- the opening / closing pitch of the gas on-off valve 1 for example, during a 1/2 skip fire intermittent operation, an ignition to non-ignition cycle is performed. Decide the number of cars and open and close the gas on-off valve 1 intermittently at this opening and closing pitch.
- the starting rotational speed is 1 0 0% (1
- the gas on-off valve 1 of each cylinder is intermittently opened and closed by the above means so that the air-fuel ratio becomes a target value. In this way, the main combustion chamber of any cylinder 1
- the gas on-off valve 1 opens and closes in the main combustion chamber 1 0 1 at a predetermined on-off pitch, so that the gas on-off valve 1 intermittently opens and closes.
- ⁇ A pressure wave of non-ignition gas fluctuation amount is generated.
- the valve intermittent operation control device 2 detects the combustion state of each cylinder from the in-cylinder pressure by the in-cylinder pressure detector 5 of each cylinder of the engine 100 in the combustion diagnostic device 3. Based on the detection waveform of the combustion state detection value for each cylinder, the combustion state is determined from the state of the detection waveform.
- the opening / closing pitch of the gas on-off valve 1 is determined so that the air-fuel ratio matches the detection waveform of the combustion state detection value, for example, 12 during the skip-fire intermittent operation, the number of cycles from ignition to non-ignition is determined. Open and close the gas on-off valve 1 intermittently at the open / close pitch.
- the detection waveform of the combustion state detection value from the combustion diagnostic device 3 is always input to the valve intermittent operation control device 2 when the engine is started, and the combustion from the combustion diagnostic device 3 According to the detection waveform of the state detection value, it is opened and closed at an opening / closing pitch that matches the detection waveform, so that the control of the air / fuel ratio at the time of standstill is the setting of the opening / closing pitch of the gas opening / closing valve 1 To increase the accuracy.
- the operating state of the engine is taken into the intermittent operation at the time of start-up, the air-fuel ratio control at the time of start-up is highly accurate, and the time for the warm-up operation is shortened or Microphone mouth that can be removed
- a pi-mouth injection type gas engine can be provided.
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- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Oil, Petroleum & Natural Gas (AREA)
- Health & Medical Sciences (AREA)
- Biomedical Technology (AREA)
- Chemical Kinetics & Catalysis (AREA)
- General Chemical & Material Sciences (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)
- Combustion Methods Of Internal-Combustion Engines (AREA)
Abstract
Description
Claims
Priority Applications (4)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US12/450,452 US8215284B2 (en) | 2007-12-14 | 2008-11-20 | Micro-pilot injection ignition type gas engine |
CN2008800147085A CN101675233B (zh) | 2007-12-14 | 2008-11-20 | 微引燃喷射式燃气发动机 |
KR1020097023199A KR101137654B1 (ko) | 2007-12-14 | 2008-11-20 | 마이크로 파일럿 분사식 가스 엔진 |
EP08863194.0A EP2136059B1 (en) | 2007-12-14 | 2008-11-20 | Micro-pilot injection type gas engine |
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP2007-323878 | 2007-12-14 | ||
JP2007323878A JP4599390B2 (ja) | 2007-12-14 | 2007-12-14 | マイクロパイロット噴射式ガスエンジン |
Publications (1)
Publication Number | Publication Date |
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WO2009078260A1 true WO2009078260A1 (ja) | 2009-06-25 |
Family
ID=40795379
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
PCT/JP2008/071592 WO2009078260A1 (ja) | 2007-12-14 | 2008-11-20 | マイクロパイロット噴射式ガスエンジン |
Country Status (6)
Country | Link |
---|---|
US (1) | US8215284B2 (ja) |
EP (1) | EP2136059B1 (ja) |
JP (1) | JP4599390B2 (ja) |
KR (1) | KR101137654B1 (ja) |
CN (1) | CN101675233B (ja) |
WO (1) | WO2009078260A1 (ja) |
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CN104822921A (zh) * | 2012-11-30 | 2015-08-05 | 五十铃自动车株式会社 | 天然气发动机以及天然气发动机的运转方法 |
Also Published As
Publication number | Publication date |
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EP2136059A1 (en) | 2009-12-23 |
JP2009144627A (ja) | 2009-07-02 |
KR20090128540A (ko) | 2009-12-15 |
JP4599390B2 (ja) | 2010-12-15 |
CN101675233B (zh) | 2013-09-25 |
CN101675233A (zh) | 2010-03-17 |
US8215284B2 (en) | 2012-07-10 |
KR101137654B1 (ko) | 2012-04-19 |
US20100043744A1 (en) | 2010-02-25 |
EP2136059B1 (en) | 2018-04-11 |
EP2136059A4 (en) | 2015-07-15 |
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