US3731665A - Internal combustion engine, more particularly for motor vehicles, and means for limiting the emission of unburned gases - Google Patents

Internal combustion engine, more particularly for motor vehicles, and means for limiting the emission of unburned gases Download PDF

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Publication number
US3731665A
US3731665A US00092084A US3731665DA US3731665A US 3731665 A US3731665 A US 3731665A US 00092084 A US00092084 A US 00092084A US 3731665D A US3731665D A US 3731665DA US 3731665 A US3731665 A US 3731665A
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US
United States
Prior art keywords
duct
engine
vapors
gases
fuel tank
Prior art date
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Expired - Lifetime
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US00092084A
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English (en)
Inventor
G Garcea
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.)
Fiat Auto SpA
Original Assignee
Alfa Romeo SpA
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Publication date
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Assigned to ALFA LANCIA S.P.A., A CORP. OF ITALY reassignment ALFA LANCIA S.P.A., A CORP. OF ITALY ASSIGNMENT OF ASSIGNORS INTEREST. Assignors: ALFA ROMEO S.P.A.
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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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
    • F02M25/00—Engine-pertinent apparatus for adding non-fuel substances or small quantities of secondary fuel to combustion-air, main fuel or fuel-air mixture

Definitions

  • a defect which is common to all of these approaches is that relative to the increase of the contents of unburned components in the engine exhaust gases, inasmuch as the mixture becomes enriched above the normal rate due to the fact that the vapors are drawn in by the engine. This fact is experienced, more than all, as the engine is started and during the initial running period of the engine after a stop. If the regeneration, or scavenging, of the filter, or the chamber, respectively, takes place very quickly and at a low engine power output, a considerable amount of vapors is admixed with a small amount of drawn in mixture, so that the latter becomes enriched.
  • This defect can also be reduced, in the case of the chamber, by increasing the volume thereof, so that, at the end of the stoppage period, it will not only contain gasoline vapors, but an extremely diluted mixture of air and vapors; by so doing the engine, by drawing in at the start such a diluted mixture, does not enrich the mixture too much.
  • An object of the invention is to overcome the defects enumerated above, and, to this purpose, it has been envisaged to use the device (with which the engines are already equipped) for drawing in again into the cylinders the gases and vapors which are formed in the inner chamber of the engine base.
  • FIG. 1 is a diagrammatical view, partly in section, of an internal combustion engine having in-line cylinders, constructed according to the invention.
  • FIGS. 2 and 3 are cross-sectional detail views which show, in dotted lines, the flow lines of the fuel vapors and, in solid lines, the flow of gases coming from the engine base.
  • the numeral 1 indicates air filter with a relevant intake manifold 2, a main choke tube 3 with a throttle 4, intake valve 5, combustion chamber 6 as formed in head 7, cylinder 8 and piston 9.
  • a timing cover 10 On the cylinder head 7 a timing cover 10 is applied, whereas oil sump tank 1 l is applied under the cylinder 8.
  • the head 7 is connected to the intake manifold 2 through a duct 12 which is branched into two ducts l3 and 14, and these latter ducts open into the manifold 2 upstream and downstream of the throttle 4, respective ly.
  • the numeral 15 indicates a duct having one end connected to the top portion ofa fuel tank 16, whereas the opposite end opens into the interior of the duct 12 in correspondence with the connection area of the duct 12 with the head 7.
  • the rubber or plastics hose constituting the duct 15 is slipped over a small tube 17 which is soldered to the duct 12.
  • the dotted line arrows show the path of the fuel vapors which reach the top portion of the inner cavity of the engine base under the conditions obtaining with a stationary engine. The vapors, then, due to their heavier specific gravity, are shifted towards the bottom portion of the inner cavity of the engine base where they are temporarily stored.
  • FIG. 3 which depicts the situation obtaining with a running engine
  • the dotted line arrows still indicate the path of the fuel vapors issuing from e tube 17
  • the solid line arrows show the pat of the gas and vapor flow which evolve in the interior of the inner cavity of the engine base. Due to the larger rate of flow of these latter gases and vapors as compared with that of the fuel vapors coming from the fuel tank, the latter are entrained by the former and thus cannot enter, during the running of the engine (and thus of the car), the inner cavity of the engine base and are, conversely, drawn in too by the engine cylinders.
  • the combination with an internal combustion engine particularly for motor vehicles provided with a head, a combustion chamber in the head, a cylinder associated with the combustion chamber, a piston movable in the cylinder, a crankcase, an intake manifold leading to the combustion chamber, an intake valve for the combustion chamber, intake valve control means in the head, a throttle in the intake manifold and a fuel tank, of means for limiting the emission of unburned gases and volatile fuels from the fuel tank, the emission limiting means including a first duct, means connecting the duct for communication with the interior of the head, said duct having first and second branches communicating with the intake manifold upstream and downstream of the throttle respectively, a second duct of less cross sectional area than the first duct, said second duct having opposite ends, one end of the second duct being in communication with a top portion of the fuel tank, and the other end of the second duct communicating with the interior of the first duct adjacent the means connecting the first duct to the head, so that with the engine stationary, the fuel vapors

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  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Lubrication Details And Ventilation Of Internal Combustion Engines (AREA)
  • Cooling, Air Intake And Gas Exhaust, And Fuel Tank Arrangements In Propulsion Units (AREA)
US00092084A 1970-01-24 1970-11-23 Internal combustion engine, more particularly for motor vehicles, and means for limiting the emission of unburned gases Expired - Lifetime US3731665A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
IT1976670 1970-01-24

Publications (1)

Publication Number Publication Date
US3731665A true US3731665A (en) 1973-05-08

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ID=11161045

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US00092084A Expired - Lifetime US3731665A (en) 1970-01-24 1970-11-23 Internal combustion engine, more particularly for motor vehicles, and means for limiting the emission of unburned gases

Country Status (4)

Country Link
US (1) US3731665A (de)
DE (1) DE2054043C3 (de)
FR (1) FR2074945A5 (de)
GB (1) GB1302166A (de)

Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4178894A (en) * 1978-03-17 1979-12-18 Briggs & Stratton Corporation Nonpolluting liquid fuel system for engines
US4593672A (en) * 1983-11-11 1986-06-10 Tomas Barone Fuel economy apparatus
US4721090A (en) * 1985-06-03 1988-01-26 Honda Giken Kogyo Kabushiki Kaisha Blow-by gas recirculating apparatus
US5598827A (en) * 1991-10-18 1997-02-04 Sanshin Kogyo Kabushiki Kaisha High pressure fuel feeding device for fuel injection engine
US6679228B1 (en) * 1999-08-16 2004-01-20 Delphi Technologies, Inc. Low evaporative emissions integrated air fuel module
EP1653077A1 (de) 2004-10-26 2006-05-03 Ford Global Technologies, LLC Einspritzventilleckstrombegrenzung
US20110132310A1 (en) * 2010-04-26 2011-06-09 Ford Global Technologies, Llc System for improving gas distribution in an intake manifold

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4395991A (en) * 1981-01-23 1983-08-02 Yamaha Hatsudoki Kabushiki Kaisha Emission preventing system of evaporated fuel for internal combustion engine
GB2536333A (en) * 2015-02-03 2016-09-14 Fluid Energy Solutions Int Ltd Sealing unit and fluid engine

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3513818A (en) * 1968-03-11 1970-05-26 Atlantic Richfield Co Fuel vapor recovery system
US3517654A (en) * 1968-03-08 1970-06-30 Chrysler Corp Evaporative emission control system

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3517654A (en) * 1968-03-08 1970-06-30 Chrysler Corp Evaporative emission control system
US3513818A (en) * 1968-03-11 1970-05-26 Atlantic Richfield Co Fuel vapor recovery system

Cited By (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4178894A (en) * 1978-03-17 1979-12-18 Briggs & Stratton Corporation Nonpolluting liquid fuel system for engines
US4593672A (en) * 1983-11-11 1986-06-10 Tomas Barone Fuel economy apparatus
US4721090A (en) * 1985-06-03 1988-01-26 Honda Giken Kogyo Kabushiki Kaisha Blow-by gas recirculating apparatus
US5598827A (en) * 1991-10-18 1997-02-04 Sanshin Kogyo Kabushiki Kaisha High pressure fuel feeding device for fuel injection engine
US6679228B1 (en) * 1999-08-16 2004-01-20 Delphi Technologies, Inc. Low evaporative emissions integrated air fuel module
US20070144489A1 (en) * 2004-10-24 2007-06-28 Kjell Fischer Injector Leakage Limitation
EP1653077A1 (de) 2004-10-26 2006-05-03 Ford Global Technologies, LLC Einspritzventilleckstrombegrenzung
US7290534B2 (en) 2004-10-26 2007-11-06 Ford Global Technologies, Llc Injector leakage limitation
US20110132310A1 (en) * 2010-04-26 2011-06-09 Ford Global Technologies, Llc System for improving gas distribution in an intake manifold
US8191525B2 (en) 2010-04-26 2012-06-05 Ford Global Technologies, Llc System for improving gas distribution in an intake manifold
US9273650B2 (en) 2010-04-26 2016-03-01 Ford Global Technologies, Llc System for improving gas distribution in an intake manifold

Also Published As

Publication number Publication date
DE2054043B2 (de) 1979-11-29
FR2074945A5 (de) 1971-10-08
GB1302166A (de) 1973-01-04
DE2054043A1 (de) 1971-07-29
DE2054043C3 (de) 1980-08-07

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Date Code Title Description
AS Assignment

Owner name: ALFA LANCIA S.P.A., A CORP. OF ITALY,ITALY

Free format text: ASSIGNMENT OF ASSIGNORS INTEREST;ASSIGNOR:ALFA ROMEO S.P.A.;REEL/FRAME:004831/0252

Effective date: 19870930

Owner name: ALFA LANCIA S.P.A., ARESE, MILAN, ITALY, A CORP. O

Free format text: ASSIGNMENT OF ASSIGNORS INTEREST.;ASSIGNOR:ALFA ROMEO S.P.A.;REEL/FRAME:004831/0252

Effective date: 19870930

STCF Information on status: patent grant

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