WO1997015756A1 - Internal combustion engine fuel injection system - Google Patents
Internal combustion engine fuel injection system Download PDFInfo
- Publication number
- WO1997015756A1 WO1997015756A1 PCT/FR1996/001601 FR9601601W WO9715756A1 WO 1997015756 A1 WO1997015756 A1 WO 1997015756A1 FR 9601601 W FR9601601 W FR 9601601W WO 9715756 A1 WO9715756 A1 WO 9715756A1
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- fuel
- engine
- control
- pressure
- injection
- Prior art date
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
- F02M63/00—Other fuel-injection apparatus having pertinent characteristics not provided for in groups F02M39/00 - F02M57/00 or F02M67/00; Details, component parts, or accessories of fuel-injection apparatus, not provided for in, or of interest apart from, the apparatus of groups F02M39/00 - F02M61/00 or F02M67/00; Combination of fuel pump with other devices, e.g. lubricating oil pump
- F02M63/06—Use of pressure wave generated by fuel inertia to open injection valves
-
- 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
- F02M2200/00—Details of fuel-injection apparatus, not otherwise provided for
- F02M2200/40—Fuel-injection apparatus with fuel accumulators, e.g. a fuel injector having an integrated fuel accumulator
Definitions
- Fuel injection system in an internal combustion engine is provided.
- the present invention relates to a fuel injection system in an internal combustion engine.
- These fuel supply systems include, for example, so-called indirect injection systems, in which the fuel is injected into the air supply duct or ducts of the engine or direct injection, in which the fuel is injected directly into the combustion chamber (s) of the engine.
- indirect injection systems in which the fuel is injected into the air supply duct or ducts of the engine
- direct injection in which the fuel is injected directly into the combustion chamber (s) of the engine.
- these systems also make it possible to considerably reduce the basic polluting emissions of two-stroke engines with sweeping by crankcase pump and powered by carburetor.
- air-assisted fuel injection systems or liquid fuel injection systems such as, for example, water hammer effect systems have been developed in the state of the art.
- control means manage the opening and closing of this control valve during the engine operating cycle, so that the opening of the valve causes a flow of fuel from the means accumulation towards the tank, while the closing thereof causes water hammer, a pressure wave in the connection means, allowing fuel to be injected into the engine via the means of injection.
- the quantity of fuel injected into the engine depends on the amplitude of the fuel pressure wave in the connection and injection means, this amplitude depending itself on the speed of the fuel in the connection means.
- this speed is controlled in the prior art, by the duration of opening of the control valve.
- the greater the duration of opening of the valve the higher the speed of the fuel in the connection means at the time of closing of the valve is high, the greater the amplitude of the pressure wave in the connection means and the greater the amount of fuel injected into the engine, and vice versa.
- the instant of injection into the engine operating cycle is also controlled by the control means which make it possible to control the opening time of the valve and therefore, for example, to anticipate this opening instant. in the valve operating cycle as the quantity of fuel to be injected increases, to obtain a fixed injection instant in the engine operating cycle.
- the choice of the value of the pressure in the accumulation means is guided by the maximum quantity of fuel to be injected into the engine and by the operating frequency thereof, which taking into account the uniqueness of the parameter for controlling the quantity injected, indicated previously, leads to a limitation of the possible operating range of the motor on the one hand, by an imprecision of the control times relative to the response times of the system on the small quantities injected and d on the other hand, by the impossibility of supplying the energy necessary to create this pressure when the engine is operating on points of low power.
- This control system usable in injection systems operating by water hammer effect, relates to a pump energy supply based on the combination of a constant current and a variable voltage whose value is a function of the pres ⁇ sion in the means of accumulation.
- a pressure sensor connected to the accumulation means delivers the pressure information necessary for a computer for the correction of the supply voltage values of the pump.
- the second patent describes, within the framework of a water hammer injection system, a device which allows a finer adaptation between on the one hand, the fuel flow control means and on the other hand, the fuel speed obtained by the opening time and the operating frequency of the control valve.
- This device actually controls the flow of fuel through a control unit that manages the control valve and a flow control valve.
- This combined control provides finer adjustment of the system than in the previous cases, but results in a large quantity of fuel being pumped directly from the regulating valve to the tank.
- This pump which ensures the flow of fuel to be accelerated and the control valve which brakes the fuel to achieve the water hammer effect, are connected to a common control unit, with the aim of achieving an adaptation between the fuel flow and the opening time of the valve.
- the object of the invention is therefore to solve these problems.
- Document DE-A-42 06 817 in the name of FICHT also relates to the field of fuel injection in an internal combustion engine and describes a fuel injection device in which a piston pump is associated with means for temporarily storing a certain volume of fuel.
- the pump piston moves along a so-called “dead” stroke, during which this piston encounters a very low displacement resistance, insofar as the volume corresponding fuel is transferred to the storage means.
- this injection device is based on the use of a phenomenon other than the water hammer phenomenon as described in the present application, insofar as in this prior document, the pressure pulse is generated in the fuel by dissipation of the kinetic energy of the piston of the pump, whereas in the system according to the invention, the pressure wave is created by dissipation of the kinetic energy of the fuel, this kinetic energy of the fuel being obtained by piloting the valve. 7/15756 PO7FR96 / 01601
- the subject of the invention is therefore a system for injecting fuel into an internal combustion engine, of the type comprising:
- control means of the control valve are adapted to control the instant and the duration of opening of the latter.
- the operating conditions of the engine further include the operating regime and the load thereof.
- - Fig.l shows a block diagram illustrating the structure of an injection system, by water hammer, fuel in an internal combustion engine, state of the art
- - Fig.2 illustrates the operation of such a system
- - Fig.3 shows a block diagram illustrating the structure of an embodiment of a system of injection, by water hammer effect, of fuel in an internal combustion engine according to the invention
- - Fig.4 illustrates the operation of such a system.
- a system of fuel injection by water hammer effect in an internal combustion engine, conventionally comprises a fuel tank designated by the general reference 1 in this figure. .
- This fuel tank is connected to means for accumulating fuel under pressure designated by the general reference 2, these means for accumulating fuel under pressure comprising for example an accumulator designated by the general reference 3 in this figure, a fuel pump 4, a filter 5 and pressure regulating means 6, connected in parallel between the outlet of the fuel pump 4 and the tank 1. Furthermore, connection means designated by the general reference 7 in this figure, are also provided between the means 2 for accumulating fuel under pressure and means for injecting carbu ⁇ rant into the engine, designated by the general reference 8 in this figure.
- connection means generally comprise a fuel acceleration duct into which a member such as a damping valve designated by the general reference 9 can be integrated.
- a control valve designated by the general reference 10 in this figure is also connected between these connection means 7 and the fuel reser ⁇ see 1. The operation of this control valve 10 is controlled at the opening and at closing by control means generally designated by the reference 11 in this figure, to generate by water hammer effect, a fuel pressure wave in the connection means to the injection means 8, allowing d '' inject fuel into the engine.
- control means comprise an information processing unit 12 based on a microcontroller for example, associated with means 13 for storing an injection map of conventional type.
- the processing unit receives information relating to the operating conditions of the engine, such as for example the speed and the operating load of the latter.
- the fuel pressure in the fuel tank 1 is designated by Pr
- the fuel pressure in the fuel pressure accumulation means 2 is designated by PO.
- This pressure PO in the accumulation means is obtained thanks to the fuel pump 4 and to the pressure regulation means 6.
- the control valve 10 In the initial state, the control valve 10 is closed. If at the instant you open the control valve 10 via the information processing unit 12 described above, the fuel pressure in the connection means 7 therefore drops to a value close to Pr as a function of the pressure losses of the circuit, but the speed of the fuel circulating in these means gradually increase to a speed V01 as illustrated.
- the kinetic energy stored by the fuel flow causes a fuel pressure wave in the connection means described above, this pressure wave having, as illustrated, an amplitude greater than the setting pressure PM of the injection means, which makes it possible to inject fuel into the engine.
- the quantity of fuel injected into the engine is a function of the amplitude of this pressure wave and it is known that it is possible to adjust this amplitude by controlling the speed of the fuel in the connection means 7 before the valve 10 closes.
- the object of the invention is to solve these problems thanks to the structure illustrated by way of example in FIG. 3.
- a fuel tank designated by the general reference 20
- fuel pressure accumulation means designated by the general reference 21, comprising an accumulator 22, a fuel pump 23, a filter 24 and pressure regulating means 25 connected in parallel between the outlet of the fuel pump 23 and the fuel tank 20.
- connection means designated by the general reference 26 constituted for example by a fuel acceleration duct, are also interposed between the accumulation means 21 and means for injecting fuel into the engine designated by the general reference 27.
- a member such as a damping valve 28 can also be interposed in these connection means 26.
- a control valve designated by the general reference 29 is also interposed between the connection means 26 and the fuel tank 20.
- This control valve is connected to control means generally designated by the reference 30 in this figure, making it possible to control the latter on opening and closing, to generate by water hammer effect, a wave of fuel pressure in the connection means 26, which makes it possible to inject fuel into the engine, thanks to the injection means 27.
- control means 30 comprise, as described above, an information processing unit designated by the general reference 31 for example at micro-controller base, associated with storage means 32 of an injection map.
- the injection system also comprises means for controlling the fuel pressure in the accumulation means 21, to allow adjustment of the amplitude of the fuel pressure wave in the connection means 26 and therefore the amount of fuel injected into the engine, depending on the operating conditions of the latter.
- engine operating conditions may, for example, include engine speed and operating load information.
- the information processing unit 31 described above is conventionally connected to means for determining the speed and the operating load of the engine, these means possibly having any suitable structure known in the state of the art.
- This information processing unit 31 can then be connected through conventional interface means to the fuel pump 23 to control the operation thereof, in order to control the fuel pressure in the accumulation means 21 and more particularly in the accumulator 22.
- This control of the operation of the pump can for example be ensured in open loop or in closed loop and in the latter case, the processing unit information 31 receives pressure information from a pressure sensor, for example 33, associated with the accumulator 22.
- Such a pump control is in itself conventional, for example in current and / or in voltage to obtain a determined fuel outlet pressure.
- This pump can be constituted for example by a conventional positive displacement pump actuated by a motor electric whose power supply is controlled by current and voltage as indicated above.
- the information processing unit 31 is adapted to control the operation of the fuel pump 23 in order to adjust the fuel pressure in the accumulator 22 so as to control this between a pressure at least equal to the pressure Pr prevailing in the fuel tank and a maximum pressure P01.
- the pressure in the fuel accumulation means is controlled, for instants and durations of opening of the control valve 29 identical, one obtains in the connection means 26, different fuel speeds V01 and V02. In fact, the higher the fuel pressure in the accumulation means, the higher the speed of the fuel in the connection means.
- the amplitudes of the corresponding generated pressure waves will also be different, for example Pmaxl and Pmax2.
- the control of the fuel pressure in the accumulation means then also makes it possible to adjust the quantity of fuel injected into the engine.
- the information processing unit 31 mentioned above and the storage means 32 of the injection map can be adapted to control in a coordinated manner, the fuel pressure in the accumulation means 21 and the instant and the duration of opening of the control valve 29.
- the different parameters defining this mapping is determined for each point of f onc ⁇ tioning of the motor in order to optimize the operation.
- the fuel injection system according to the invention is based on a modulation of the fuel pressure in the accumulation means, which may or may not be associated with a modulation of the instant and the duration of the opening of the control valve and this to allow optimum adjustment of the quantity of fuel injected into the engine for each operating point thereof, by controlling the amplitude of the pressure wave created by water hammer during the operation of this control valve.
- Each engine operating point can then be characterized by optimum operating parameters corresponding to a determined pressure in the accumulation means, a determined duration of opening of the control valve and a determined instant of triggering of the opening thereof, these various parameters being able to be determined beforehand by calculation and / or experimentation as a function of the desired operating characteristics of the engine and of the characteristics characteristic thereof.
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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
Description
Claims
Priority Applications (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
EP96934907A EP0857253A1 (en) | 1995-10-24 | 1996-10-14 | Internal combustion engine fuel injection system |
AU73047/96A AU7304796A (en) | 1995-10-24 | 1996-10-14 | Internal combustion engine fuel injection system |
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
FR9512528A FR2740178B1 (en) | 1995-10-24 | 1995-10-24 | FUEL INJECTION SYSTEM IN AN INTERNAL COMBUSTION ENGINE |
FR95/12528 | 1995-10-24 |
Publications (1)
Publication Number | Publication Date |
---|---|
WO1997015756A1 true WO1997015756A1 (en) | 1997-05-01 |
Family
ID=9483864
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
PCT/FR1996/001601 WO1997015756A1 (en) | 1995-10-24 | 1996-10-14 | Internal combustion engine fuel injection system |
Country Status (4)
Country | Link |
---|---|
EP (1) | EP0857253A1 (en) |
AU (1) | AU7304796A (en) |
FR (1) | FR2740178B1 (en) |
WO (1) | WO1997015756A1 (en) |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
WO1998016737A1 (en) | 1996-10-15 | 1998-04-23 | Peugeot Motocycles S.A. | System for injecting fuel into an internal combustion engine |
Citations (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
GB793459A (en) * | 1955-04-28 | 1958-04-16 | Nsu Werke Ag | Improvements in or relating to fuel injection equipment for internal combustion engine |
DE2009322A1 (en) * | 1969-05-07 | 1971-01-28 | Technische Hochschule Otto von Guericke Magdeburg, χ 3010 Magdeburg | Hydraulic pressure surge injection device, in particular for internal combustion engines |
EP0418601A1 (en) * | 1989-09-21 | 1991-03-27 | Robert Bosch Gmbh | Injection device for a diesel engine |
DE4206817A1 (en) * | 1991-10-07 | 1993-04-29 | Ficht Gmbh | IC engine fuel injection system - accelerates injection pump plunger between fuel pump and fuel nozzle over part stroke with pressure rise by unit leading to fuel injection across nozzle |
-
1995
- 1995-10-24 FR FR9512528A patent/FR2740178B1/en not_active Expired - Fee Related
-
1996
- 1996-10-14 EP EP96934907A patent/EP0857253A1/en not_active Withdrawn
- 1996-10-14 AU AU73047/96A patent/AU7304796A/en not_active Abandoned
- 1996-10-14 WO PCT/FR1996/001601 patent/WO1997015756A1/en not_active Application Discontinuation
Patent Citations (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
GB793459A (en) * | 1955-04-28 | 1958-04-16 | Nsu Werke Ag | Improvements in or relating to fuel injection equipment for internal combustion engine |
DE2009322A1 (en) * | 1969-05-07 | 1971-01-28 | Technische Hochschule Otto von Guericke Magdeburg, χ 3010 Magdeburg | Hydraulic pressure surge injection device, in particular for internal combustion engines |
EP0418601A1 (en) * | 1989-09-21 | 1991-03-27 | Robert Bosch Gmbh | Injection device for a diesel engine |
DE4206817A1 (en) * | 1991-10-07 | 1993-04-29 | Ficht Gmbh | IC engine fuel injection system - accelerates injection pump plunger between fuel pump and fuel nozzle over part stroke with pressure rise by unit leading to fuel injection across nozzle |
Non-Patent Citations (2)
Title |
---|
C. CARSON ET AL.: "RAM-TUNED AND AIR-ASSISTED DIRECT FUEL INJECTION SYSTEMS APPLIED TO A SI TWO-STROKE ENGINE", SAE950269, 27 February 1995 (1995-02-27) - 2 March 1995 (1995-03-02), INTERNATIONAL CONGRESS AND EXHIBITION DETROIT,MICHIGAN, pages 43 - 52, XP000565514 * |
KÜNTSCHNER ET AL.: "Ein unconventionelles einspritzsystem für kleine schnellaufende diesel motoren", FISITA 865040, 2 June 1986 (1986-06-02) - 6 June 1986 (1986-06-06), XXI FISITA CONGRESS, BELGRADE, pages 1293 - 1296, XP000565513 * |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
WO1998016737A1 (en) | 1996-10-15 | 1998-04-23 | Peugeot Motocycles S.A. | System for injecting fuel into an internal combustion engine |
Also Published As
Publication number | Publication date |
---|---|
FR2740178A1 (en) | 1997-04-25 |
EP0857253A1 (en) | 1998-08-12 |
AU7304796A (en) | 1997-05-15 |
FR2740178B1 (en) | 1998-01-02 |
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