Classifications

• • 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
• • 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
  • 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
• • 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
  • F02B23/08—Other engines characterised by special shape or construction of combustion chambers to improve operation with positive ignition
  • F02B23/10—Other engines characterised by special shape or construction of combustion chambers to improve operation with positive ignition with separate admission of air and fuel into cylinder
• • 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
• • 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
  • F02M45/00—Fuel-injection apparatus characterised by having a cyclic delivery of specific time/pressure or time/quantity relationship
  • F02M45/02—Fuel-injection apparatus characterised by having a cyclic delivery of specific time/pressure or time/quantity relationship with each cyclic delivery being separated into two or more parts
  • F02M45/04—Fuel-injection apparatus characterised by having a cyclic delivery of specific time/pressure or time/quantity relationship with each cyclic delivery being separated into two or more parts with a small initial part, e.g. initial part for partial load and initial and main part for full load
• • 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
  • F02B1/00—Engines characterised by fuel-air mixture compression
  • F02B1/12—Engines characterised by fuel-air mixture compression with compression ignition
• • 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
  • F02B2275/00—Other engines, components or details, not provided for in other groups of this subclass
  • F02B2275/14—Direct injection into combustion chamber
• • 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
  • F02B23/0669—Details related to the fuel injector or the fuel spray having multiple fuel spray jets per injector nozzle
• • 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
  • F02B3/00—Engines characterised by air compression and subsequent fuel addition
  • F02B3/06—Engines characterised by air compression and subsequent fuel addition with compression ignition
• • 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
• • 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

• a method of controlling fuel injection for an internal combustion engine and engine using such a method is disclosed.
• the present invention relates to a fuel injection control method for an internal combustion engine, particularly direct injection, and a motor using such a method.
• a homogeneous mode for low and medium engine loads, with a fuel injection to obtain a homogeneous mixture of fuel with air or with a mixture of air and recirculated exhaust gas before the start of operation. combustion.
• the other combustion mode called conventional combustion, consists of an injection of the fuel around the top dead center of the piston and diffusion combustion, this mode being preferably used at high loads.
• Such a type of engine as better described in French Patent Applications Nos. 2,818,324 and 2,818,325, comprises at least one cylinder, a piston sliding in this cylinder, a combustion chamber delimited on one side by the upper face of the cylinder.
• piston comprising a stud disposed in the center of a concave bowl and at least one injector for injecting fuel with an angle of
• CD tablecloth less than or equal to 2Arctg - where CD is the diameter of the cylinder and F la
• the fuel is conventionally injected into the combustion chamber in a single sequence but burns only after a certain period of time associated with the combustion. interaction of the fuel jets with the piston wall, existing with the type of homogeneous combustion developed by the applicant.
• the present invention proposes to overcome the drawbacks enumerated above by means of a method which makes it possible to introduce the fuel so as to reduce the self-ignition time of the latter.
• the present invention relates to a fuel injection control method for an internal combustion engine, especially direct injection, comprising at least one cylinder, a piston sliding in this cylinder and comprising a stud arranged in a bowl. concave, a fuel injector and a combustion chamber, characterized in that, for very high engine loads, a first quantity of fuel is injected for a piston position between 35 and 70 ° before the top dead center. of this piston, followed by the injection of at least a second quantity of fuel, the first quantity of fuel being less than the second and that the fuel is injected into said combustion chamber with an injector having
• CD a web angle (a-i) less than or equal to lArctg - where CD is the diameter of the
• IF cylinder and F the distance between the point of origin of the fuel jets from the injector and the position of the piston corresponding to a crankshaft angle of 50 ° with respect to the top dead center (TDC) of the piston.
• the second amount of fuel can be continued after the top dead center of the piston.
• the fuel can be injected with a ratio between the first quantity of fuel and the second quantity of 1/10 to 1/20.
• the invention also relates to an internal combustion engine, in particular direct injection engine comprising at least one cylinder, a piston sliding in this cylinder, a combustion chamber delimited on one side by the upper face of said piston comprising a stud arranged in the center of a concave bowl and a fuel injector, characterized in that it comprises a
• Injector CD having a lap angle (ai) less than or equal to lArctg - where CD is
• FIG. 1 shows schematically an internal combustion engine according to the invention
• FIG. 2 is a graph showing the reduction of combustion noise by using the method according to the invention
• FIG. 3 is also a graph showing the power levels generated by the engine with and without the process. of the invention.
• a direct injection diesel internal combustion engine comprises at least one cylinder 10 of diameter CD and a cylinder head 12 carrying air intake means and exhaust gas exhaust means, here respectively at least one intake manifold 14 for a gaseous fluid, such as air or a mixture of air and recirculated flue gas (EGR), at least one exhaust pipe 16 of flue gas, the pipes being controlled by opening or closing, by an intake valve 18 and an exhaust valve 20.
• a gaseous fluid such as air or a mixture of air and recirculated flue gas (EGR)
• EGR recirculated flue gas
• the cylinder head also carries a fuel injector 22 which is preferably disposed coaxially with the axis of the cylinder and comprises in the vicinity of its nose 24 a plurality of orifices through which the fuel is sprayed into the combustion chamber 26, according to jets 28.
• the combustion chamber is delimited by the upper face of a piston 30, sliding alternately rectilinear in the cylinder 10, the inner face of the cylinder head 12 facing this piston and the circular wall of the cylinder 10 between the two faces.
• the upper face of the piston comprises a concave bowl 32 inside which a pin 34 is arranged being located substantially in the center of this bowl and rising towards the cylinder head 12.
• the fuel injector 22 is typical low angle ply a- ⁇ . This angle ai is chosen so that the wall of the cylinder 10 is never wetted by the fuel for any position of the piston 30 between + 50 ° and + ⁇ or between
• CD denotes the diameter (in mm) of the cylinder 10 and F the distance (in mm) between the point of origin of the fuel jets 28 and the position of the piston corresponding to a crankshaft angle of 50 °, then the lap angle ai (in
• nappe angle it is understood the angle at the top that forms the cone coming from the injector and whose imaginary peripheral wall passes through all the axes of the fuel jets 28.
• the angular range for the lap angle ⁇ 1 is at most 120 ° and preferably between 40 ° and 100 °.
• This engine also comprises a control and calculation unit 36, called engine ECU, which is connected by conductors (for some bi-directional) to the various organs and sensors of the engine (shown schematically by the box 38 in the figure) so as to be able to receive the various signals emitted by these sensors, such as the position of the piston 30 via a position sensor connected to the crankshaft that usually comprises this engine, to process them by calculation and then to control the organs of this engine to ensure its proper operation.
• This unit also receives indications on the request of the driver, for example the position of the accelerator pedal 40. Based on this information and indications, the engine computer 36, which contains tables or maps, sends instructions to the various organs. engine to meet the driver's demand.
• This unit is particularly suitable for controlling the parameters of the fuel injection, such as the amount of fuel injected into the combustion chamber by the injector 22 as well as the injection moment in the usual cycle of combustion of the engine.
• the unit 36 is connected by control lines 42 to the various control members (not shown) of the injectors 22.
• the unit 36 knows at all times the operating state of the engine and the driver's request.
• the computer controls the injection of fuel so as to obtain a homogeneous fuel mixture in Ia combustion chamber while avoiding that fuel wets the walls of the cylinder.
• the computer 36 controls the injector 22 so as to achieve, before the piston reaches its top dead point combustion, a first fuel injection, said primary injection, then at least a second fuel injection, called the main injection, in greater quantity.
• the ratio between the primary injection and the main injection is about 1/10 to 1/20.
• the primary injection is not too early so as to avoid any wetting of the wall by the fuel.
• the unit 36 receives instructions from the support on the accelerator pedal by the driver, as the depression of the pedal and the speed of the depression. These instructions are analyzed and compared by the computer based on maps contained in this unit. In the case where the unit deduces that the instructions received correspond to a request for very high loads, the unit 36 controls the primary injection of fuel for a position of the piston between 35 and 70 ° before the PMH then realizes the beginning the main injection between 20 to 35 ° before the top dead center (TDC) of the piston and continues this main injection after TDC, if necessary.
• TDC top dead center
• the first amount of fuel injected can burn and increases the pressure and temperature of the mixture present in the combustion chamber.
• the following main fuel injection is performed in a chamber with consequent pressure / temperature parameters so that this fuel can burn in a conventional manner with a reduced self-ignition time.
• the primary injection of fuel thus makes it possible to reduce the combustion noise by about 2 dB (FIG. A1 bar for a fuel injection without primary injection and the B1 bar for a fuel injection with primary injection) and to increase the engine power by about 4% (Figure 3: A2 bar for a fuel injection without primary injection and the bar B2 for a fuel injection with primary injection).

Landscapes

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

Applications Claiming Priority (2)

Publications (1)

Family

ID=34981270

Family Applications (1)

Country Status (6)

Citations (1)

Family Cites Families (17)

• 2005
  • 2005-02-16 FR FR0501610A patent/FR2882100B1/fr not_active Expired - Fee Related
• 2006
  • 2006-02-13 WO PCT/FR2006/000317 patent/WO2006087451A1/fr active Application Filing
  • 2006-02-13 EP EP06709299A patent/EP1859133A1/de not_active Withdrawn
  • 2006-02-13 JP JP2007555661A patent/JP2008530444A/ja active Pending
  • 2006-02-13 US US11/816,292 patent/US7874276B2/en not_active Expired - Fee Related
  • 2006-02-13 KR KR1020077021031A patent/KR101233501B1/ko not_active IP Right Cessation

Patent Citations (1)

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