WO2011008706A2 - Procédés de combustion en mode mixte adaptatif et moteurs utilisant ce procédé - Google Patents

Procédés de combustion en mode mixte adaptatif et moteurs utilisant ce procédé Download PDF

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Publication number
WO2011008706A2
WO2011008706A2 PCT/US2010/041736 US2010041736W WO2011008706A2 WO 2011008706 A2 WO2011008706 A2 WO 2011008706A2 US 2010041736 W US2010041736 W US 2010041736W WO 2011008706 A2 WO2011008706 A2 WO 2011008706A2
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WO
WIPO (PCT)
Prior art keywords
fuel
engine
jets
injection
larger
Prior art date
Application number
PCT/US2010/041736
Other languages
English (en)
Other versions
WO2011008706A3 (fr
Inventor
Deyang Hou
Original Assignee
Quantlogic Corporation
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Quantlogic Corporation filed Critical Quantlogic Corporation
Publication of WO2011008706A2 publication Critical patent/WO2011008706A2/fr
Publication of WO2011008706A3 publication Critical patent/WO2011008706A3/fr

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Classifications

    • 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
    • F02D41/38—Controlling fuel injection of the high pressure type
    • F02D41/40—Controlling fuel injection of the high pressure type with means for controlling injection timing or duration
    • F02D41/402—Multiple injections
    • F02D41/403—Multiple injections with pilot injections
    • 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
    • F02D41/3094—Controlling fuel injection the fuel injection being effected by at least two different injectors, e.g. one in the intake manifold and one in the cylinder
    • 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
    • F02B23/00—Other engines characterised by special shape or construction of combustion chambers to improve operation
    • F02B23/02—Other engines characterised by special shape or construction of combustion chambers to improve operation with compression ignition
    • F02B23/06—Other engines characterised by special shape or construction of combustion chambers to improve operation with compression ignition the combustion space being arranged in working piston
    • F02B23/0645—Details related to the fuel injector or the fuel spray
    • F02B23/0648—Means or methods to improve the spray dispersion, evaporation or ignition
    • F02B23/0651—Means or methods to improve the spray dispersion, evaporation or ignition the fuel spray impinging on reflecting surfaces or being specially guided throughout the combustion space
    • 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
    • F02B23/00—Other engines characterised by special shape or construction of combustion chambers to improve operation
    • F02B23/02—Other engines characterised by special shape or construction of combustion chambers to improve operation with compression ignition
    • F02B23/06—Other engines characterised by special shape or construction of combustion chambers to improve operation with compression ignition the combustion space being arranged in working piston
    • F02B23/0672—Omega-piston bowl, i.e. the combustion space having a central projection pointing towards the cylinder head and the surrounding wall being inclined towards the cylinder center axis
    • 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
    • Y02T10/40—Engine management systems

Definitions

  • the present invention relates to combustion methods, and an internal combustion engine using the same, either compression ignition or spark ignition, or mixed-mode combustion engine using both compression ignition and spark ignition.
  • HCCI Compression Ignition
  • PCCI Premixed Charge Compression Ignition
  • variable spray angle or using different spray angel injection and penetration are much better positioned to solve this contradiction between the requirements for different injection timings and operation loads.
  • the innovative design of said combustion method has solved this wall- wetting issue through providing a variable spray angle or using different spray angles, which is smaller for early injection and becomes larger for late injection, and a variable spray pattern or different spray patterns, which is formed with smaller holes with smaller spray angles for early injection with less penetration strength, and tends to larger multi- jets for late injection with higher penetration strength.
  • a variable spray angle can be provide by either a fuel injector with variable orifice such as documented in
  • the said different spray angles and patterns can also be provided by two fuel injectors in a single cylinder with different fixed spray angles and nozzle hole layouts.
  • a adaptive mixed-mode combustion method which is mainly for internal combustion engines, either compression ignition or spark ignition, or mixed-mode engines using both compression ignition and spark ignition.
  • the said combustion method utilizes a variable orifice fuel injector or at least two injectors per cylinder wherein it has means to produce variable spray patterns with smaller spray angle multi-jets for earlier injection(s), and larger spray angle multi-jets for main injection(s) around engine top dead center, respectively, in the same engine power cycle, wherein it has adaptive means to distribute fuel into combustion chamber space based on engine loads and speeds, to produce a separate twin triangular heat release curves to effectively reduce emissions and fuel consumptions.
  • a combustion engine using the said combustion method is also provided.
  • the innovative design of said combustion method has solved wall- wetting issue through providing variable spray angles or different spray angles, which are smaller for early injection(s) and becomes larger for late injection(s), and variable spray patterns, which are formed with smaller jets with smaller spray angles for early injection(s) with less penetration strength, and becomes larger multi-jets with larger spray angles for late injection(s) with higher penetration strength.
  • the said combustion method can significantly reduce soot and nitride oxygen emission formation and fuel consumption.
  • a premixed charge of fuel and air is desirable for reducing emissions.
  • the sudden release of all the heat could damage the engine.
  • only partially premix fuel and air before TDC is desirable.
  • an on-going 'premixing' process is desired.
  • a novel method for introducing fuel into the combustion chamber space is desired to distribute partial fuel in desirable locations and prepare the fuel to join faster combustion reaction only close or after TDC. This is realized by distributing partial fuel in a fine mixture format close to chamber surface approximately between the middle stage of compression stroke and 40 degree before TDC.
  • Fig. 1 is an illustration of heat release for conventional diffusion combustion. Initial heat (11) release is associated with high NOx formation and is overlapped with main heat release (12).
  • Fig. 2 is an illustration of heat releases for said Adaptive Mixed-Mode Combustion method.
  • First heat release (21) is associated with clean early premixed combustion, thus reduces diffusion combustion of main injection (22).
  • the twin triangular heat release reduces emissions and provides more flexibility for thermal efficiency optimization.
  • the vertical line (2C) is the Centroid line of heat release, which can be dynamically set to an optimized crank angle to optimize combustion.
  • Fig. 3 Exemplary hest release curves of a combustion engine using the said Adaptive Mixed-Mode Combustion method. Heat release from smaller earlier jets is separate from heat release from larger later fuel jets. Heat release from smaller jet and that from larger jet are separate sequential events, with heat release from smaller jet happens first, and that from larger jets follows. The separate heat releases form a twin triangular shape heat release curves.
  • Fig. 4 is an illustration of different spray patterns optimized for different injection timings, with earlier injections having smaller angles (2a) for premixed combustion, and late injection around TDC having larger spray angles (2c) similar to conventional diesel combustion.
  • 41 and 42 - small angle sprays for premixed combustion;
  • 43 - larger angle sprays for conventional combustion;
  • Fig. 5 is an illustration of the internal combustion engine using the said combustion methods and variable orifice fuel injectors; 51 - variable orifice fuel injector; 52 - small angle sprays for early or late injections away from TDC; 53 - piston chamber surface; 54 - piston, 55 - cylinder; 56 - cylinder head; 57 - larger angle sprays for main injections;
  • a adaptive mixed-mode combustion method for internal combustion engines comprising steps of: (i) setting fuel injection timings and fuel quantities based on engine speeds and loads, (ii) utilizing at least one fuel injector which has means to introduce fuel into a combustion chamber with different fuel injection spray angles, with smaller spray angles for an early or post fuel injection, which is away from engine top dead center (TDC), and larger spray angles for a main fuel injection, which is close to engine TDC, respectively, in the same engine power cycle which typically includes intake,
  • such a centroid of heat release can be calculated from the sampling of real time in-cylinder pressure censor and form a real time pressure curve, then calculate the heat release curves. Based on area below the heat release curves, we can easily calculate the centroid position of the twin heat releases. Then we can dynamically adjust the fuel injection timings and quantity of smaller earlier jets and that of larger main injections.
  • the centroid is preferably set between 5-20 degree ATDC.
  • the smaller fuel jets are coupled with lower injection pressure, preferably between 300-1000 bar, and larger fuel jets are coupled with higher injection pressure, preferably above 1200bar, wherein the different fuel pressure levels are provided by at least one of the following means including different cam profiles, different pressure common rail reservoirs, or local pressure amplification inside injectors;
  • fuel is injected in the similar manner as (a) but with less fuel percentage of approximately 5-20% injected as earlier injection(s), wherein the percentage decreases along with increased loads;
  • Said engine has an exhaust gas recirculation (EGR) ratio approximately between 5-60%, depending on engine loads, with lower loads tend to have higher EGR ratios.
  • EGR exhaust gas recirculation
  • fuel is injected in the similar manner as (a) but with less fuel percentage of approximately 5-20% injected as earlier injection(s);
  • said engine has a lower swirl ratio preferably between 0-1.5, a preferred
  • said engine has a nozzle with 6-10 larger holes with larger spray angles
  • said engine has an exhaust gas recirculation (EGR) ratio approximately between 5-60%, depending on engine loads, with lower loads tend to have higher EGR ratios.
  • EGR exhaust gas recirculation

Landscapes

  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Combustion Methods Of Internal-Combustion Engines (AREA)
  • Fuel-Injection Apparatus (AREA)
  • Electrical Control Of Air Or Fuel Supplied To Internal-Combustion Engine (AREA)

Abstract

L'invention porte sur un procédé de combustion en mode mixte qui est principalement prévu pour des moteurs à combustion interne, soit à allumage par compression, soit à allumage par étincelle, ou des moteurs à mode mixte qui utilisent l'allumage par compression et l'allumage par étincelle. Ledit procédé de combustion utilise un injecteur de carburant à orifice variable ou au moins deux injecteurs par cylindre, ayant des moyens pour produire des formes de pulvérisation variables comportant des jets à angle de pulvérisation plus petit pour l'injection ou les injections précoces et des jets à angle de pulvérisation plus large pour l'injection principale ou les injections principales à proximité du point mort haut du moteur respectivement, dans le même cycle de travail du moteur, et a des moyens adaptatifs pour répartir le carburant dans l‘espace de la chambre de combustion en se basant sur des charges et des vitesses de moteur afin de réduire efficacement les émissions et les consommations de carburant. L'invention porte aussi sur un moteur à combustion qui utilise ledit procédé de combustion.
PCT/US2010/041736 2009-07-12 2010-07-12 Procédés de combustion en mode mixte adaptatif et moteurs utilisant ce procédé WO2011008706A2 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
US22490009P 2009-07-12 2009-07-12
US61/224,900 2009-07-12

Publications (2)

Publication Number Publication Date
WO2011008706A2 true WO2011008706A2 (fr) 2011-01-20
WO2011008706A3 WO2011008706A3 (fr) 2011-04-28

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WO (1) WO2011008706A2 (fr)

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2012155122A2 (fr) * 2011-05-12 2012-11-15 Deyang Hou Procédés de combustion à mode mixte activés par des reformeurs de combustible et moteurs utilisant ceux-ci
EP2860380A4 (fr) * 2012-06-08 2016-01-06 Toyota Motor Co Ltd Dispositif pour diagnostiquer des états de combustion dans des moteurs à combustion interne
US10823106B1 (en) * 2019-05-13 2020-11-03 Caterpillar Inc. Early pilot lean burn strategy in dual fuel engine using targeted pilot flames
US11499496B2 (en) 2018-01-16 2022-11-15 Caterpillar Inc. Engine control system and method

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0076433A2 (fr) * 1981-10-01 1983-04-13 Nissan Motor Co., Ltd. Système de commande de coupure d'injection de carburant dans un moteur à combustion interne à transmission automatique
US20040267430A1 (en) * 2003-06-30 2004-12-30 Richard Ancimer Method and apparatus for controlling an internal combustion engine using accelerometers
US20050221952A1 (en) * 2004-03-29 2005-10-06 Masayuki Tetsuno Engine starting system
US20070006841A1 (en) * 2005-07-11 2007-01-11 Kesse Mary L Mixed mode control method and engine using same
US20070034188A1 (en) * 2005-08-10 2007-02-15 Duffy Kevin P Engine system and method of operating same over multiple engine load ranges

Family Cites Families (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH10220303A (ja) * 1997-02-04 1998-08-18 Kubota Corp 火花点火式ガスエンジンの燃料ガス噴射装置

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0076433A2 (fr) * 1981-10-01 1983-04-13 Nissan Motor Co., Ltd. Système de commande de coupure d'injection de carburant dans un moteur à combustion interne à transmission automatique
US20040267430A1 (en) * 2003-06-30 2004-12-30 Richard Ancimer Method and apparatus for controlling an internal combustion engine using accelerometers
US20050221952A1 (en) * 2004-03-29 2005-10-06 Masayuki Tetsuno Engine starting system
US20070006841A1 (en) * 2005-07-11 2007-01-11 Kesse Mary L Mixed mode control method and engine using same
US20070034188A1 (en) * 2005-08-10 2007-02-15 Duffy Kevin P Engine system and method of operating same over multiple engine load ranges

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2012155122A2 (fr) * 2011-05-12 2012-11-15 Deyang Hou Procédés de combustion à mode mixte activés par des reformeurs de combustible et moteurs utilisant ceux-ci
WO2012155122A3 (fr) * 2011-05-12 2013-03-28 Deyang Hou Procédés de combustion à mode mixte activés par des reformeurs de combustible et moteurs utilisant ceux-ci
EP2860380A4 (fr) * 2012-06-08 2016-01-06 Toyota Motor Co Ltd Dispositif pour diagnostiquer des états de combustion dans des moteurs à combustion interne
US11499496B2 (en) 2018-01-16 2022-11-15 Caterpillar Inc. Engine control system and method
US10823106B1 (en) * 2019-05-13 2020-11-03 Caterpillar Inc. Early pilot lean burn strategy in dual fuel engine using targeted pilot flames
US20200362791A1 (en) * 2019-05-13 2020-11-19 Caterpillar Inc. Early pilot lean burn strategy in dual fuel engine using targeted pilot flames

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Publication number Publication date
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