EP2108797A1 - Moteur à combustion interne à faible consommation, intégrant un système pour la super expansion des gaz d'échappement - Google Patents

Moteur à combustion interne à faible consommation, intégrant un système pour la super expansion des gaz d'échappement Download PDF

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Publication number
EP2108797A1
EP2108797A1 EP08006918A EP08006918A EP2108797A1 EP 2108797 A1 EP2108797 A1 EP 2108797A1 EP 08006918 A EP08006918 A EP 08006918A EP 08006918 A EP08006918 A EP 08006918A EP 2108797 A1 EP2108797 A1 EP 2108797A1
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EP
European Patent Office
Prior art keywords
engine
engines
exhaust
super
cylinders
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Withdrawn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
EP08006918A
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German (de)
English (en)
Inventor
Giulio Martinozzi
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Individual
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Individual
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Publication date
Application filed by Individual filed Critical Individual
Priority to EP08006918A priority Critical patent/EP2108797A1/fr
Publication of EP2108797A1 publication Critical patent/EP2108797A1/fr
Withdrawn legal-status Critical Current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
    • F02B—INTERNAL-COMBUSTION PISTON ENGINES; COMBUSTION ENGINES IN GENERAL
    • F02B41/00—Engines characterised by special means for improving conversion of heat or pressure energy into mechanical power
    • F02B41/02—Engines with prolonged expansion
    • F02B41/06—Engines with prolonged expansion in compound cylinders
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01K—STEAM ENGINE PLANTS; STEAM ACCUMULATORS; ENGINE PLANTS NOT OTHERWISE PROVIDED FOR; ENGINES USING SPECIAL WORKING FLUIDS OR CYCLES
    • F01K23/00—Plants characterised by more than one engine delivering power external to the plant, the engines being driven by different fluids
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02G—HOT GAS OR COMBUSTION-PRODUCT POSITIVE-DISPLACEMENT ENGINE PLANTS; USE OF WASTE HEAT OF COMBUSTION ENGINES; NOT OTHERWISE PROVIDED FOR
    • F02G3/00—Combustion-product positive-displacement engine plants
    • F02G3/02—Combustion-product positive-displacement engine plants with reciprocating-piston engines

Definitions

  • This invention relates to piston type, positive displacement, internal combustion engines and particularly a method for performing the a so-called “super-expansion" thermodynamic cycle by means of conventionally manufactured internal combustion engines.
  • thermodynamic cycle (Otto or Diesel) of a conventional four-stroke internal combustion engine, by four additional strokes allowing to double the expansion volume and thus further exploit the energy of the hot gases at the end of the incomplete expansion occurring within the conventional engines.
  • thermodynamic cycle This solution, based on a novel unconventional engine configuration, called “Multi-cylinder barrel-type engine”, entails a radical modification of the structure, of the dynamics and of the components of the conventional internal combustion engine. Therefore, the suggested method for performing such an 8-stroke “super-expansion thermodynamic cycle” requires a considerable development effort and corresponding modifications to the current manufacturing process, thus not practicable although the potential gain in efficiency, as predicted by a computer-assisted investigation on said thermodynamic cycle, is of the order of 40%.
  • a first embodiment is schematically represented, consisting in a combination of a first (1) and a second (2) engines disposed parallel to each other and having conveniently the same n° of cylinders, the same displacement, identical crankshaft and same housing structure, so that they can be easily reciprocally assembled and their crankshafts dynamically connected, through a pairs of gears: in this way the two engines are constraint to run at a synchronised speed and are able to exchange torque and power.
  • a gas capacitor (3) thereinafter called “capacitor” is interposed between the first and the second engine in order to tightly transfer the exhaust gases from the first engine to the inlet duct of the second engine.
  • a current four-cylinder engine operating along a 4-stroke Otto or Diesel cycle, has being selected in this example, as the "first engine”, which runs in a fully conventional mode, with the only exception that the exhaust gases are conveyed to the capacitor (3), and not to a conventional exhaust system (muffler)
  • a unitary gas quantity (corresponding to the displacement volume of a single cylinder) is expelled, by said first engine in operation, every half revolution and pushed into the capacitor.
  • the n° 4) of the first engine performs its expulsion phase, in its turn, by expelling another unitary amount of gas (at said intermediate pressure), which amount , through the capacitor is simultaneously admitted into the other two aspirating cylinders (the n°7 and 8) of the second engine, while the first two cylinders n°5,6 becomes ready to admit a 3 rd unitary volume, coming from expelling piston n° 2 during the following 3 rd stroke, and so on thanks with the following 3 rd and 4 th strokes.
  • the second engine conclude two expansion/expulsion cycles on each pair of cylinders, so that, during steady operation, the same amount of gas is flowing in series through the two engines. It is then possible to conclude that the intermediate pressure which automatically builds up in the capacitor sensitively depends on the shutting time dictated by the inlet valve cams (7).
  • variable pressure-relief valve could conveniently be mounted on the capacitor. It is clear, finally, that while the first engine delivers to the main shaft its own power as in conventional operation, the second engine is adding, to the main output shaft, through the second crankshaft and the relevant gears (8) a supplementary power which is able to extract from the exhaust gases, during the super-expansion phase.
  • the second engine do not need to have the same n° of cylinders nor the same displacement volume as the first engine: the person skilled in the art will promptly see that, although not convenient, it is sufficient for the second engine to have a single cylinder and at least about the same displacement in order to correctly operate in combination as an expanding chamber, provided of course that the overhead cams profiles are opportunely designed as above explained.
  • a conventional V-Engine configuration is suggested to be adopted to equally perform of a super-expansion cycle as illustrated in the scheme of Fig. 4
  • V-Engine In a 2 or 4 or 6 or 8 or more cylinders V-Engine conventional lay-out, in fact, one disposes of two-cylinder banks, each containing a single or 2 or 3 or 4 or more pistons on-line, all supported on a single crankshaft.
  • the single crankshaft represents the automatic integration of the first and second engine's crankshafts, since all the 2, or 4, or 6, or 8, pistons are supported on the same central crankshaft already before the modifications.
  • the one bank cylinders (first engine) operate along a conventional 4-strokes cycle delivering the power of a conventional engine, and at the same time the second bank cylinders (second engine) operate as expansion chambers performing the "super-expansion" and adding supplementary power onto the same output shaft, again without addition of fuel consumption.
  • a further simpler configuration of conventional 4-strokes engine is suggested to be used for performing the "super-expansion" cycle, which is the classic multi-cylinders in-line engines, ranging from the 2- to 16- (or more-) cylinders engines.
  • the opportune modification of the overhead camshafts and injection systems makes it possible to let only one first half of the cylinders staggered (as illustrated in fig. 5 ) or contiguous (not illustrated) to operate as active internal combustion engine ( first engine ).
  • the expected increase in efficiency is always in the order of 40%, by logic transfer of the results of the computer-assisted investigation cited on page 2, since the performed thermodynamic cycle is always the same.
  • the main merit of the presently disclosed engine-compound is that of indicating an easy method for applying the technology of the "super-expansion cycle" (as defined in the above mentioned patent publication) onto the current constructional technology for the internal combustion engine, thus allowing to retain all the advantages of this highly performing technology.
  • the above described engine-compound presents the drawback of a higher specific weight and dimensions with the respect to the conventional engine, it is however to be stressed that all the particular solutions proposed by the above 2 nd and 3 rd embodiments, or by any other more accurate design based on this invention, reveal all the industrial interest which could be raised in the field of stationary engines, for driving electrical generators, or in the field of naval propulsion, wherein the problem of weight and dimensions represents a minor factor.
  • the 1 st embodiment reveals itself of special interest as it suggests a reliable method for empirically proving the considerable efficiency increase to be obtained on the internal combustion engines, as predicted by the a. m. computer-assisted analysis, by the application of said "super-expansion cycle".
  • This 1st embodiment in fact, provides for completely separate “first and second engines" which is particularly useful for making measurements and investigating the most suitable operating conditions during development tests.

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  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Valve-Gear Or Valve Arrangements (AREA)
EP08006918A 2008-04-07 2008-04-07 Moteur à combustion interne à faible consommation, intégrant un système pour la super expansion des gaz d'échappement Withdrawn EP2108797A1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
EP08006918A EP2108797A1 (fr) 2008-04-07 2008-04-07 Moteur à combustion interne à faible consommation, intégrant un système pour la super expansion des gaz d'échappement

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
EP08006918A EP2108797A1 (fr) 2008-04-07 2008-04-07 Moteur à combustion interne à faible consommation, intégrant un système pour la super expansion des gaz d'échappement

Publications (1)

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EP2108797A1 true EP2108797A1 (fr) 2009-10-14

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EP08006918A Withdrawn EP2108797A1 (fr) 2008-04-07 2008-04-07 Moteur à combustion interne à faible consommation, intégrant un système pour la super expansion des gaz d'échappement

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EP (1) EP2108797A1 (fr)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN106089409A (zh) * 2016-06-15 2016-11-09 徐小山 一种活塞往复式发动机
CN112814742A (zh) * 2021-02-08 2021-05-18 天津大学 空气混合动力均质燃烧二级膨胀发动机系统及控制方法

Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2000224A (en) * 1977-06-20 1979-01-04 Martin J Compound internal combustion engine
US5566549A (en) * 1995-06-05 1996-10-22 Caterpillar Inc. In-line engines having residual cycles and method of operation
WO1999058831A1 (fr) * 1998-05-13 1999-11-18 Armer & Frank Motors, Llc Moteur combine a rendement du carburant et a emissions ameliores
US6202416B1 (en) * 1998-08-13 2001-03-20 The United States Of America As Represented By The Administrator Of The U.S. Environmental Protection Agency Dual-cylinder expander engine and combustion method with two expansion strokes per cycle
US20040123821A1 (en) * 2002-11-11 2004-07-01 Hu Lung Tan Eight-stroke internal combustion engine utilizing a slave cylinder
WO2005012692A1 (fr) 2003-07-25 2005-02-10 VOGLAIRE, Hélène Moteur a plusieurs cylindres

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2000224A (en) * 1977-06-20 1979-01-04 Martin J Compound internal combustion engine
US5566549A (en) * 1995-06-05 1996-10-22 Caterpillar Inc. In-line engines having residual cycles and method of operation
WO1999058831A1 (fr) * 1998-05-13 1999-11-18 Armer & Frank Motors, Llc Moteur combine a rendement du carburant et a emissions ameliores
US6202416B1 (en) * 1998-08-13 2001-03-20 The United States Of America As Represented By The Administrator Of The U.S. Environmental Protection Agency Dual-cylinder expander engine and combustion method with two expansion strokes per cycle
US20040123821A1 (en) * 2002-11-11 2004-07-01 Hu Lung Tan Eight-stroke internal combustion engine utilizing a slave cylinder
WO2005012692A1 (fr) 2003-07-25 2005-02-10 VOGLAIRE, Hélène Moteur a plusieurs cylindres

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN106089409A (zh) * 2016-06-15 2016-11-09 徐小山 一种活塞往复式发动机
CN106089409B (zh) * 2016-06-15 2019-06-28 徐小山 一种活塞往复式发动机
CN112814742A (zh) * 2021-02-08 2021-05-18 天津大学 空气混合动力均质燃烧二级膨胀发动机系统及控制方法
CN112814742B (zh) * 2021-02-08 2023-10-31 天津大学 空气混合动力均质燃烧二级膨胀发动机系统及控制方法

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