GB2025522A - Intake system for an internal combustion engine - Google Patents

Intake system for an internal combustion engine Download PDF

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Publication number
GB2025522A
GB2025522A GB7923037A GB7923037A GB2025522A GB 2025522 A GB2025522 A GB 2025522A GB 7923037 A GB7923037 A GB 7923037A GB 7923037 A GB7923037 A GB 7923037A GB 2025522 A GB2025522 A GB 2025522A
Authority
GB
United Kingdom
Prior art keywords
intake passage
intake
fuel
passage
air
Prior art date
Legal status (The legal status 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 status listed.)
Withdrawn
Application number
GB7923037A
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Mitsubishi Motors Corp
Original Assignee
Mitsubishi Motors Corp
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 Mitsubishi Motors Corp filed Critical Mitsubishi Motors Corp
Publication of GB2025522A publication Critical patent/GB2025522A/en
Withdrawn legal-status Critical Current

Links

Classifications

    • 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
    • F02M35/00—Combustion-air cleaners, air intakes, intake silencers, or induction systems specially adapted for, or arranged on, internal-combustion engines
    • F02M35/10—Air intakes; Induction systems
    • F02M35/10006—Air intakes; Induction systems characterised by the position of elements of the air intake system in direction of the air intake flow, i.e. between ambient air inlet and supply to the combustion chamber
    • F02M35/10019—Means upstream of the fuel injection system, carburettor or plenum chamber
    • 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
    • F02M29/00—Apparatus for re-atomising condensed fuel or homogenising fuel-air mixture
    • F02M29/04—Apparatus for re-atomising condensed fuel or homogenising fuel-air mixture having screens, gratings, baffles or the like
    • 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
    • F02M35/00—Combustion-air cleaners, air intakes, intake silencers, or induction systems specially adapted for, or arranged on, internal-combustion engines
    • F02M35/10—Air intakes; Induction systems
    • F02M35/10209—Fluid connections to the air intake system; their arrangement of pipes, valves or the like
    • F02M35/10216—Fuel injectors; Fuel pipes or rails; Fuel pumps or pressure regulators
    • 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
    • F02M35/00—Combustion-air cleaners, air intakes, intake silencers, or induction systems specially adapted for, or arranged on, internal-combustion engines
    • F02M35/10—Air intakes; Induction systems
    • F02M35/10242—Devices or means connected to or integrated into air intakes; Air intakes combined with other engine or vehicle parts
    • F02M35/10262—Flow guides, obstructions, deflectors or the like
    • 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
    • F02M69/00—Low-pressure fuel-injection apparatus ; Apparatus with both continuous and intermittent injection; Apparatus injecting different types of fuel
    • F02M69/04—Injectors peculiar thereto
    • F02M69/042—Positioning of injectors with respect to engine, e.g. in the air intake conduit
    • F02M69/043—Positioning of injectors with respect to engine, e.g. in the air intake conduit for injecting into the intake conduit upstream of an air throttle valve
    • 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
    • F02M35/00—Combustion-air cleaners, air intakes, intake silencers, or induction systems specially adapted for, or arranged on, internal-combustion engines
    • F02M35/02—Air cleaners
    • 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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  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Fuel-Injection Apparatus (AREA)

Abstract

An intake passage 3 is bent at a portion thereof between an air cleaner (not shown) and an intake manifold 2, a mounting 10 for a fuel injector 9 projecting into a section of the intake passage downstream of the bent portion to define an annular passage 12, and an annular enlarged chamber 13 being formed around said annular passage 12, whereby the air flowing through the intake passage is uniformed to improve mixing of fuel and air. The fuel injector 9 is provided in a projecting end of the mounting 10 substantially coaxially with the downstream passage section, and a throttle valve 11 is disposed in the intake passage downstream of the fuel injector and a baffle plate 15, perforated plates 17, 18 and honeycomb passages 19 are provided whereby fuel and air are sufficiently mixed to unify distribution of fuel in a fuel and air mixture. <IMAGE>

Description

SPECIFICATION Intake passage system for internal combustion engine BACKGROUND OF THE INVENTION This invention relates to an intake passage system for a spark-ignition internal combustion engine for supplying fuel through a fuel injector into a concentrated portion of an intake manifold.
An internal combustion engine of a concentrated fuel injection type in which fuel is injected into a concentrated portion of an intake manifold by a fuel injector is advantageous in making a fuel system simple and manufacturing the engine far less costly, comparing with an engine of a conventional fuel injection type in which a fuel injector is provided for each cylinder of the engine to supply fuel thereinto. The concentrated fuel injection type engine has also good productivity and reliability. However, in this type of engine, uniformity of distribution of fuel to the respective cylinders is inferior to the conventional type of engine.This is resulted from insufficiency of mixing of fuel and air and of atomization of fuel, deflected flow and turbulence of intake air, adhesion of fuel onto an inner wall of the intake passage, and deflection of an injecting direction of fuel due to manufacturing error of the fuel injector. Furthermore, if fuel is injected intermittently from the injector, at for example slow-speed driving of the engine, some of the cylinders is not supplied with fuel due to a relationship between a timing of intermittent injection of fuel and suction stroke of each cylinder, and with such a non-supply of fuel being repeated cyclically a beat phenomenon is happened to cause unstable running of the engine.
SUMMARY OF THE INVENTION An object of this invention is to provide an intake passage system for an internal combustion engine of a concentrated fuel injection type, in which uniformity of distribution of fuel to the respective cylinders of the enigne is improved, and possibility of a beat phenomenon causing unstable running of the engine is reduced or avoided.
According to this invention, there is provided an intake passage system for an internal combustion engine comprising an intake passage bent at a portion thereof between an air cleaner and a concentrated portion of an intake manifold, an attaching portion for a fuel injector extending from a wall of the passage facing a section of the intake passage downstream of the bent portion and projecting into the downstream passage section, said attaching portion defining an annular passage at said bent portion, and an annular enlarged chamber formed around said annular passage and having an axis substantially in alignment with a center axis of said downstream passage section, said fuel injector being provided in a projecting end of said attaching portion substantially coaxially with said center axis of the downstream passage section, a throttle valve being disposed in the intake passage downstream of the said fuel injector.
BRIEF DESCRIPTION OF THE DRAWINGS This invention will now be explained by way of example with reference to the accompanying drawings in which: Figure 1 is a cross-sectional view of an intake passage system for an internal combustion engine according to this invention, taken along the line I-I in Fig. 2, and Figure 2 is a cross-sectional view taken along the line ll-ll in Fig. 1.
DESCRIPTION OF THE PREFERRED EMBODI MENTS Referring to Figs. 1 and 2, an internal combustion engine of a concentrated fuel injection type has an engine 1 itself having a plurality of cylinders, an intake manifold 2 connected to the engine 1, an air horn 4 connected to a concentrated portion of the intake manifold 2 and defining in its inside and intake passage 3 bent substantially at a right angle, and an intake pipe 5 connected to the air horn 4. An open end of the intake pipe 5 is connected to an air cleaner (not shown) through an appropriate flow sensor for measuring a flow of intake air.
The intake manifold 2 is provided with a heat riser 6 which is supplied with engine cooling water or exhaust gas to heat a fuel and air mixture supplied to the cylinders of the engine through the intake manifold 2, thereby promoting atomization of fuel.
The air horn 4 has an enlarged section 7 and a downwardly extending section 8 extending substantially at a right angle relative to the enlarged section. The enlarged section 7 is provided on its wall facing the downwardly extending section 8 with a cylindrical attaching portion 10 for attaching a fuel injector 9.
An axis of the attaching portion 10 is substantially in alignment with a center axis of the intake passage 3 in the downwardly extending section 8. The fuel injector 9 is provided in a projecting end of the attaching portion 10 substantially coaxially with said center axis. The fuel injector 9 may be of any types, but in this embodiment it is a conventional fuel injector in which a valve member is displaced to its open and closed positions in response to energization and deenergization of an electromagnetic coil of the injector. The fuel injector is also set its spray angle S of fuel about 30"-90" A throttle valve 11 is disposed in the intake passage 3 in the downwardly extending section 8 downstream of the fuel injector 9.The throttle valve 11 is dis posed in the intake passage at a location in which, at an idle position of the throttle valve, an uppermost end thereof is positioned in or slightly downstream of a plane substantially perpendicular to said center axis of the intake passage 3 and passing through an intersection between a conical surface of spray formed by the fuel injected from the fuel injector 9 and a wall surface of the intake passage 3 in the downwardly extending section 8.
The attaching portion 10 extends from said wall of the enlarged section 7 and projects into the intake passage 3 in the downwardly extending section 8 to define an annular passage 1 2 at the perpendicularly bent portion of the intake passage 3 at an upper end of the downwardly extending section 8. The portion 10 also defines within the enlarged section 7 an annular enlarged chamber 1 3 having an axis substantially in alignment with said center axis of the intake passage 3. This enlarged chamber 1 3 is adapted to attenuate directivity of the intake air flowing from the air cleaner and relieve pulsation of the .air flow in the intake passage 3.An annular protrusion 14 is formed on a lower inner wall of the enlarged chamber 1 3 at a connection between the annular passage 1 2 and the enlarged chamber 1 3 to promote uniforming of the air flow and attenuation of directivity of the intake air.
An arcuate baffle plate 1 5 is provided at an air intake side of said enlarged chamber 13 to distribute substantially uniformly the intake air from the air cleaner in the entirety of the enlarged chamber 13. Also, a partition plate 1 6 is provided on the inner wall of the enlarged chamber 1 3 diametrically opposite to an air intake end of the enlarged section 7.
Consequently, the intake air is distributed substantially uniformly in the entirety of the enlarged chamber 1 3 by said baffle plate 1 5 and prevented from turning in the enlarged chamber 1 3 by the partition plate 16. Thus, the directivity of the intake air is attenuated to permit the air to flow substantially uniformly into the annular passage 1 2 from the periphery thereof. The baffle plate 1 5 may be formed by a sheet metal having no hole or a porous plate having a large number of small apertures or slits and is disposed substantially concentrically with the center axis of the intake passage 3 in the downwardly extending section 8.A shape of the baffle plate 1 5 is not limited to an arc as shown, but may be of any shape such as a triangle.
In practical use, the above described construction of the intake passage system is sufficient to distribute the intake air substantially uniformly in the enlarged chamber 1 3 and to flow the air uniformly into the annular passage 1 2 from the periphery thereof, but in this embodiment the followin-g other components are added in order to improve the above effects:Two annular flow uniforming-plates 1 7 and 1 8 having different diameters are disposed concentrically with respect to the portion 10 in said enlarged chamber 1 3. The flow uniforming plates 1 7 and 1 8 are formed by porous plates having a large number of apertures and adapted to attenuate the directivity of the intake air and permit the air to flow substantially uniformly into the annular passage from the periphery thereof, as similarly to the baffle plate 1 5. Of cause, instead of two flow uniforming plates 1 7 and 18, a single annular flow uniforming plate may be provided.A flow uniforming grating 1 9 of an appropriate shape such as a honeycomb core shape is located in the annular passage 1 2.
The flow uniforming grating 1 9 is adapted to uniform or straighten the flow of air flowing through the flow uniforming plates 1 7 and 1 8 into the intake passage 3 in the downwardly extending section 8, thereby preventing the fuel injected into the intake passage 3 by the fuel injector 10 from partially adhering onto the wall of the intake passage if the fuel is deflectedly injected.
Air flowing through the air cleaner and flow sensor into the enlarged chamber 1 3 is distributed uniformly around the annular flow uniforming plate 1 7 and prevented from turning by the baffle plate 1 5 and the partition plate 1 6 provided in the enlarged chamber 1 3. Then, the air flows uniformly into the annular passage 12 through a large number of apertures in the flow uniforming plates 17 and 1 8 and enters into the intake passage 3 in the downwardly extending section 8 after the flow Df air is straightened and uniformed by passing through the flow uniforming grating 1 9. This straightened and uniform flow of the intake air prevents the adhesion of the fuel injected from the fuel injector 9 onto the wall surface of the intake passage 3, so that ununiformity of distribution of the fuel resulted from the adhesion of fuel is relieved.
In addition, if fuel is injected intermittently from the fuel injector 9, at for example slowspeed driving of the engine, distribution of the fuel in the fuel and air mixture is ununiform, so that the beat phenomenon causing unstable running of the engine is happened due to a relationship with a suction stroke of each cylinder of the engine. However, even in such a case, since the throttle valve 11 is disposed at a predetermined position downstream of the fuel injector 9, the fuel adheres onto the throttle valve 11 which acts as a damper, whereby ununiformity of distribution of the fuel in the mixture caused by the intermittent supply of the fuel is relieved when the fuel mixed in the intake air. Also, a turbulence of flow of the intake air is produced in the intake passage 3 downstream of the throttle valve 11, so that the fuel passed through the throttle valve is sufficiently mixed with the intake air by this turbulence of the air flow. Consequently, the distribution of the fuel in the mixture is unified to improve uniformity of distribution of the fuel into the respective cylinders, thereby reducing or avoiding possibility of the beat phenomenon. Furthermore, even if a direction of injection of the fuel from the fuel injector 9 is deflected because of manufacturing error, the uniformity of distribution of the fuel is maintained due to the throttle valve 11 and the turbulence of the air flow in the downstream side of the throttle valve 11.
Thus, by the intake passage system according to the invention, it becomes possible to always distribute the uniform fuel and air mixture into each cylinder at any driving range of the engine. Therefore, ununiformity of distribution of fuel in the engine of the concentrated fuel injection type is eliminated.

Claims (8)

1. An intake passage system for an internal combustion engine comprising an intake passage bent at a portion thereof between an air cleaner and a concentrated portion of an intake manifold, an attaching portion for a fuel injector extending from a wall of the passage facing a section of the intake passage downstream of the bent portion and projecting into the downstream passage section, said attaching portion defining an annular passage at said bent portion, and an annular enlarged chamber formed around said annular passage and having an axis substantially in alignment with a center axis of said downstream passage section, said fuel injector being provided in a projecting end of said attaching portion substantially coaxially with said center axis of the downstream passage section, a throttle valve being disposed in the intake passage downstream of said fuel injector.
2. An intake passage system as claimed in claim 1, wherein said fuel injector is adapted to spray fuel conically, said throttle valve being positioned in or slightly downstream of a plane passing through an intersection between a conical surface of spray formed by the injected fuel and a wall surface of the intake passage.
3. An intake passage system as claimed in claim 1 or 2, wherein an annular protrusion is formed on a lower side of a connection between said enlarged chamber and said annular passage.
4. An intake passage system as claimed in claim 1, 2 or 3, wherein a baffle plate is provided at an air intake side of said enlarged chamber to distribute substantially uniformly intake air from said air cleaner in the entirety of said enlarged chamber.
5. An intake passage system as claimed in any preceding claim, wherein a partition plate for preventing turning of air is provided in said enlarged chamber at a side opposite to the air intake side.
6. An intake passage system as claimed in any preceding claim, wherein at least one annular flow uniforming plate having a large number of apertures is provided in said enlarged chamber.
7. An intake passage system as claimed in any preceding claim, wherein a flow uniforming member is located in said annular passage.
8. An intake passage system, for an internal combustion engine, substantially as hereinbefore described with reference to, and as shown in, the accompanying drawings.
GB7923037A 1978-07-07 1979-07-03 Intake system for an internal combustion engine Withdrawn GB2025522A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP53082073A JPS602514B2 (en) 1978-07-07 1978-07-07 Internal combustion engine intake passage structure

Publications (1)

Publication Number Publication Date
GB2025522A true GB2025522A (en) 1980-01-23

Family

ID=13764292

Family Applications (1)

Application Number Title Priority Date Filing Date
GB7923037A Withdrawn GB2025522A (en) 1978-07-07 1979-07-03 Intake system for an internal combustion engine

Country Status (4)

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JP (1) JPS602514B2 (en)
DE (1) DE2927217A1 (en)
FR (1) FR2430520A1 (en)
GB (1) GB2025522A (en)

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2489424A1 (en) * 1980-08-26 1982-03-05 Bosch Gmbh Robert FUEL INJECTION INSTALLATION
WO1988003990A1 (en) * 1986-11-24 1988-06-02 Bendix Electronics Limited Engine air diffuser
US4905651A (en) * 1987-04-30 1990-03-06 Weber S.R.L. Device for forming and metering an air and fuel mixture for an internal combustion engine
WO2005088104A1 (en) 2004-03-18 2005-09-22 Pratt & Whitney Canada Corp. Gas turbine inlet flow straightener with restricting member
WO2012049028A1 (en) * 2010-10-13 2012-04-19 Mahle International Gmbh Filter element and air filter

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3019544A1 (en) * 1980-05-22 1981-11-26 Robert Bosch Gmbh, 7000 Stuttgart FUEL SUPPLY SYSTEM
DE19924493C1 (en) * 1999-05-28 2000-07-27 Daimler Chrysler Ag Nozzle for ventilating motor vehicle interior has insert in form of longitudinally displaceable, frame-like carriage movable into housing by defined displacement to close outlet
ITBO20020251A1 (en) * 2002-04-30 2003-10-30 Elettromeccanica Gasperini S R CALIBRATED INJECTOR GROUP FOR THE POWER OF A COMBUSTION ENGINE IN PARTICULAR FOR GENERATOR SETS

Family Cites Families (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR944364A (en) * 1940-08-03 1949-04-04 Bendix Aviat Corp Power supply device for internal combustion engines
FR938758A (en) * 1942-07-22 1948-10-25 Bendix Aviat Corp Improvements to fuel supply systems
US3376027A (en) * 1964-02-19 1968-04-02 Univ California Fuel atomizing carburetors
CA1102191A (en) * 1977-11-21 1981-06-02 Lauren L. Bowler Fuel injection apparatus with wetting action

Cited By (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2489424A1 (en) * 1980-08-26 1982-03-05 Bosch Gmbh Robert FUEL INJECTION INSTALLATION
WO1988003990A1 (en) * 1986-11-24 1988-06-02 Bendix Electronics Limited Engine air diffuser
US4905651A (en) * 1987-04-30 1990-03-06 Weber S.R.L. Device for forming and metering an air and fuel mixture for an internal combustion engine
WO2005088104A1 (en) 2004-03-18 2005-09-22 Pratt & Whitney Canada Corp. Gas turbine inlet flow straightener with restricting member
EP1733127A1 (en) * 2004-03-18 2006-12-20 Pratt & Whitney Canada Corp. Gas turbine inlet flow straightener with restricting member
EP1733127A4 (en) * 2004-03-18 2010-03-31 Pratt & Whitney Canada Gas turbine inlet flow straightener with restricting member
WO2012049028A1 (en) * 2010-10-13 2012-04-19 Mahle International Gmbh Filter element and air filter
EP2674605A1 (en) * 2010-10-13 2013-12-18 MAHLE International GmbH Filter element and air filter

Also Published As

Publication number Publication date
JPS5510040A (en) 1980-01-24
DE2927217A1 (en) 1980-01-17
FR2430520A1 (en) 1980-02-01
JPS602514B2 (en) 1985-01-22

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