WO1990000226A1 - Systeme d'alimentation d'un moteur en carburant - Google Patents

Systeme d'alimentation d'un moteur en carburant Download PDF

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Publication number
WO1990000226A1
WO1990000226A1 PCT/EP1988/000583 EP8800583W WO9000226A1 WO 1990000226 A1 WO1990000226 A1 WO 1990000226A1 EP 8800583 W EP8800583 W EP 8800583W WO 9000226 A1 WO9000226 A1 WO 9000226A1
Authority
WO
WIPO (PCT)
Prior art keywords
wall
air
inlet
heating
engine
Prior art date
Application number
PCT/EP1988/000583
Other languages
English (en)
Inventor
Kurt Engelsdorf
Rolf Gawlik
Karl-Heinz HÄGELE
Original Assignee
Robert Bosch Gmbh
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 Robert Bosch Gmbh filed Critical Robert Bosch Gmbh
Priority to PCT/EP1988/000583 priority Critical patent/WO1990000226A1/fr
Publication of WO1990000226A1 publication Critical patent/WO1990000226A1/fr

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
    • F02M31/00—Apparatus for thermally treating combustion-air, fuel, or fuel-air mixture
    • F02M31/02—Apparatus for thermally treating combustion-air, fuel, or fuel-air mixture for heating
    • F02M31/04—Apparatus for thermally treating combustion-air, fuel, or fuel-air mixture for heating combustion-air or fuel-air mixture
    • F02M31/10—Apparatus for thermally treating combustion-air, fuel, or fuel-air mixture for heating combustion-air or fuel-air mixture by hot liquids, e.g. lubricants or cooling water
    • F02M31/107—Controlled or manual switching
    • 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

Definitions

  • the present invention relates to a fuel supply system and more particularly to a system for optimising the supply of air/fuel mixture to the individual cylinders of an internal combustion engine.
  • the mixture distribution to the cylinders via the inlet manifold depends on a number of factors including engine speed and location of cylinder (i.e. whether it is an inner cylinder or an outer cylinder); in addition it depends strongly on the temperature of the inlet manifold, which can be heated by heat-exchange with the exhaust gases or the cooling medium of the vehicle engine.
  • the mixture distribution required for optimal operation of the engine depends on different factors in different ways so that the operation of the system and the design of the inlet manifold involve compromises.
  • the present invention seeks to provide a fuel supply system which operates as well as possible over a wide range of operating conditions.
  • a fuel supply system for an internal combustion engine comprising air/fuel mixture inlet means to the cylinders and means for heating at least part of the inlet means, characterised in that means are provided for controlling the rate at which heat is supplied by the heating means to the inlet means in dependence on one or more engine operating parameters.
  • An advantage of this system is that control of the temperature of the inlet means enables an optimum mixture distribution to the cylinders to be achieved under a wide range of operating conditions.
  • values representing the optimal temperatures of the inlet means for different engine operating points are stored and appropriate values are selected for the controlling means.
  • the inlet means is readily maintained at an optimal temperature so as to minimise A - deviations.
  • the heating means comprises a heat exchanger and the controlling means controls the rate of flow of the. heating fluid through the heat exchanger.
  • the heating fluid may be the coolant of the cooling system of the vehicle.
  • the heat exchanger may be made integral with the inlet means.
  • the inlet means may comprise an air/fuel mixture inlet passage surrounded by a first generally cylindrical wall which is surrounded by one or more passages for the heating fluid and then a second generally cylindrical wall.
  • the first wall is thin relative to the second wall.
  • the first wall has high thermal conductivity and a low thermal capacity, whilst the second wall is of thermally insulating material.
  • An advantage of this heat exchanger is that the temperature of the inlet means can be quickly changed to match the existing speed-load conditions of the motor.
  • the inlet means is preferably an inlet manifold.
  • air/fuel mixture inlet means for an internal combustion engine comprising an inlet passage for the air/fuel mixture surrounded by a wall, characterised in that the wall is of relatively thin material with high thermal conductivity and low thermal capacity and is surrounded at a spacing by a further wall of relatively thick material and defining with the first wall one or more passages for the flow of a heating medium.
  • the further wall is preferably of a thermally insulating material.
  • Fig.l is a block diagram of a fuel supply system with heating of the inlet manifold
  • Fig.2 is a cross-section of a preferred inlet manifold pipe
  • Figs.3a_, b_ and c_ are graphs showing the air-fuel ratios supplied to the individual cylinders of an i.e. -engine under different conditions of inlet anifiold heating;
  • Fig.4a_ is a schematic diagram of an inlet manifold
  • Fig.4b is a series of graphs showing the air-fuel ratios supplied to the individual cylinders of an i.e.engine at different engine speeds but without the heating control of the present invention.
  • Fig.l shows a motor fuel supply system 10 in which an air/fuel mixture is supplied from a carburettor or central injection unit 11 to an inlet manifold 20.
  • the manifold is heated by engine coolant and its temperature is detected by a sensor 16.
  • the manifold 20 distributes the mixture to the individual cylinders of a motor 12 and the exhaust gases leave at point 13.
  • the exhaust gases are analysed at 14, and any deviations from the stoichiometric ratio (i.e. deviations of the air/fuel ratio - from its ideal value of unity) are detected by an electrical/mechanical controller 15 so that appropriate correcting action can be taken.
  • the controller also receives inputs from the manifold temperature sensor 16 and from the motor 12. Among the operating parameters detected at the motor 12 and fed to the controller 15 are the ⁇ -.-values of the individual cylinders.
  • the optimal temperatures of the engine coolant are determined as a function of the engine operating parameters. These values are stored as a set of parameters. In use, these optimal temperature values for each operating point can be obtained by controlling the flow rate of engine coolant.
  • the controller 15 controls the rate of flow of the heating fluid to the inlet manifold 20.
  • the adjustment is effected by a control member, e.g. a valve 21, in the passage from the heating fluid supply 22.
  • a control member e.g. a valve 21
  • the rate of flow f By controlling the rate of flow f , the temperature of the inlet manifold wall and hence of the mixture therein is also controlled.
  • the ⁇ -deviations of the individual cylinders become minimal, to ensure optimal running of the engine over wide ranges of operating conditions.
  • an inlet manifold having a portion with a cross-section as shown in Fig.2.
  • the air/fuel induction passageway 31 is surrounded by a thin wall 32 of good thermal conductivity and low thermal capacity so that the contents of passageway 31 are in good thermal communication with the heating fluid in surrounding passageways 33.
  • the outer wall 34 of the passageways is relatively thick and is preferably of thermally insulating material.
  • Figs 3a,3b and 3c respectively show the ⁇ -values of the four cylinders of an i.e. engine with the inlet manifold too strongly heated, unheated and optimally heated.
  • Fig.4a_ shows the transport of the air/fuel mixture in a siamese-type inlet manifold 20.
  • the mixture is supplied from a first distribution point 41 via secondary distribution points 42,43 to the four cylinders which fire in the order 1-3-4-2.
  • the manifold comprises two symmetrical halves and during the suction phases of one half, the other half of the manifold is inactive. There is always a thin film of fuel stored on the wall of the manifold, and in the inactive half of the manifold much of this film evaporates.
  • the inner cylinder which comes first in the suction sequence, receives most of the vaporised fuel and therefore a much richer mixture than the outer cylinder. The lower the r.p. . of the engine the longer is the period of suction-inactivity and the more of the wall film mass can evaporate.
  • This low speed behaviour is illustrated at the left of Fig.4, with Fig.4b showing the corresponding air/fuel ratio deviations.
  • centrifugal effect dominates.
  • the liquid fuel is atomized into droplets, when passing through the injection valve.
  • the smaller droplets are quickly vaporized and transported with the airstream even around sharp edges.
  • the bigger droplets are thrown off course by centrifugal forces and enter the outer cylinders. This is called the centrifugal effect and causes the mixture of the outer cylinders to become richer and that of the inner ones to become leaner. The higher the r.p. . the greater is this effect.
  • the inlet manifold may be heated by part of the exhaust gases from the engine, with a suitable control element in the exhaust system.
  • a separate controllable heating means may be specifically provided for the inlet manifold.
  • the engine may have any number of cylinders.
  • the cross-section shown in Fig.2 may be of a common part of the inlet manifold for supplying air/fuel mixture to all the cylinders in turn, or one of a plurality of similar respective parts for the individual cylinders. Alternatively it may represent a section of any other part of the pipe system between the carburettor and the cylinders.

Landscapes

  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Exhaust Gas After Treatment (AREA)

Abstract

Afin de réduire au minimum les déviations μ entre les cylindres séparés d'un moteur à combustion interne, dans lequel un mélange air/carburant est amené via un collecteur d'admission (20) chauffé par exemple par le système réfrigérant du moteur, des organes de commande (21) sont prévus pour commander la vitesse à laquelle la chaleur arrive dans le collecteur d'admission (20), et par conséquent la température dudit collecteur en fonction d'un ou de plusieurs paramètres de fonctionnement du moteur déterminés par une unité de commande (15). Le collecteur d'admission (20) comprend un passage d'induction (31, fig. 2 non représentée) qui est séparé des passages (33) pour le fluide chauffant par une mince paroi, de façon à se trouver en bonne communication thermique avec eux.
PCT/EP1988/000583 1988-07-01 1988-07-01 Systeme d'alimentation d'un moteur en carburant WO1990000226A1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
PCT/EP1988/000583 WO1990000226A1 (fr) 1988-07-01 1988-07-01 Systeme d'alimentation d'un moteur en carburant

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
PCT/EP1988/000583 WO1990000226A1 (fr) 1988-07-01 1988-07-01 Systeme d'alimentation d'un moteur en carburant

Publications (1)

Publication Number Publication Date
WO1990000226A1 true WO1990000226A1 (fr) 1990-01-11

Family

ID=8165296

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/EP1988/000583 WO1990000226A1 (fr) 1988-07-01 1988-07-01 Systeme d'alimentation d'un moteur en carburant

Country Status (1)

Country Link
WO (1) WO1990000226A1 (fr)

Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1819284A (en) * 1929-03-21 1931-08-18 Marvel Carbureter Co Heat control apparatus
FR2191032A1 (fr) * 1972-06-28 1974-02-01 Honda Motor Co Ltd
FR2192602A5 (fr) * 1972-07-07 1974-02-08 Honda Motor Co Ltd
EP0039378A1 (fr) * 1980-05-07 1981-11-11 Dok Young Cha Dispositif pour vaporiser du gas-oil utilisé comme carburant dans un moteur à allumage par bougies
EP0124046A2 (fr) * 1983-04-27 1984-11-07 Nissan Motor Co., Ltd. Agencement de chauffage pour le système d'admission d'un moteur à combustion interne, qui répond au mode d'opération
JPS60164655A (ja) * 1984-02-06 1985-08-27 Nissan Motor Co Ltd 内燃機関の燃料霧化促進装置
EP0187280A2 (fr) * 1984-12-21 1986-07-16 FIAT AUTO S.p.A. Système d'alimentation et de réglage pour un moteur à combustion interne principalement actionné par éthanol

Patent Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1819284A (en) * 1929-03-21 1931-08-18 Marvel Carbureter Co Heat control apparatus
FR2191032A1 (fr) * 1972-06-28 1974-02-01 Honda Motor Co Ltd
FR2192602A5 (fr) * 1972-07-07 1974-02-08 Honda Motor Co Ltd
EP0039378A1 (fr) * 1980-05-07 1981-11-11 Dok Young Cha Dispositif pour vaporiser du gas-oil utilisé comme carburant dans un moteur à allumage par bougies
EP0124046A2 (fr) * 1983-04-27 1984-11-07 Nissan Motor Co., Ltd. Agencement de chauffage pour le système d'admission d'un moteur à combustion interne, qui répond au mode d'opération
JPS60164655A (ja) * 1984-02-06 1985-08-27 Nissan Motor Co Ltd 内燃機関の燃料霧化促進装置
EP0187280A2 (fr) * 1984-12-21 1986-07-16 FIAT AUTO S.p.A. Système d'alimentation et de réglage pour un moteur à combustion interne principalement actionné par éthanol

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
Patent Abstracts of Japan, volume 9, no. 333 (M.443)(2056), 27 December 1985; & JP-A-60164655 (NISSAN JIDOSHA K.K.) 27 August 1985 *

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