FR2573486A1 - MIXTURE FORMING DEVICE FOR MULTI-CYLINDER INTERNAL COMBUSTION ENGINES - Google Patents

Abstract

MIXTURE FORMING DEVICE FOR INTERNAL COMBUSTION ENGINES 1 WITH MULTIPLE CYLINDERS, INCLUDING A FIRST AIR SUCTION DUCT 3 AND A SECOND AIR SUCTION DUCT 5 INCLUDING AN INTENTIONALLY ACTIONABLE GAS BUTTERFLY 6, TO WHICH IS COUPLED REGISTER THE GAS BUTTERFLY 2 FROM THE FIRST AIR SUCTION DUCT, SECOND AIR SUCTION DUCT FROM WHERE THE MIXTURE SUCTION DUCTS 7 GO TO THE INDIVIDUAL SUCTION DUCTS 4 OF THE FIRST DUCT AIR, THE MIXTURE SUCTION DUCTS 7 HAVE A PORTION OF VENTURI 9 IN WHICH THE INJECTION DUCTS 10 OPERATE FROM A FUEL METERING VALVE 11. THESE PROVISIONS ARE INTENDED TO OBTAIN A GOOD DISTRIBUTION AND A GOOD PREPARATION MIXTURE.

Description

Mixing device for combustion engines

  internal multi-cylinder.

  The invention relates to a device for forming the mixture for internal combustion engines with several cylinders, comprising an air suction duct provided with a throttle valve, from which the suction ducts lead leading to the individual cylinders. , a second air intake duct

  having an intensively actuable throttle valve

  where, from where, the suction pipes of the met

  diaper going to the individual suction ducts, the papil-

  lon gas from the first air intake duct being coupled

  in register with the throttle valve of the second vacuum duct

  air ration, and a fuel metering valve.

  Such a mixture-forming device is known from

DE-OS 29 51 788.

  In this device, a fuel metering valve is

  located downstream of the throttle valve of the second vacuum duct

  air ration and injects into the aspirated air in rapid flow

  when the engine is running. The aim is to obtain an ato-

  atomization and vaporization of the injected fuel.

  DE-OS 30 33 728 discloses a central injection which is not of this type and in which an injection nozzle disposed directly above a branch section comprises ducts injection by which fuel is injected each time the suction pipes to the cylinders are opened. The aim is also to obtain a dis-

uniform fuel allocation.

  In the first device, the fuel is injected through the fuel metering valve at a right angle with

  the air intake duct, resulting in a distribution

  irregular fuel due to the injection model

  only from the nozzle, so that during the next distribution to the different suction ducts, there may be

  uneven distribution of the mixture.

  The disadvantage of the second device is that the fuel is

  injected in a single jet into the opening of the different con-

  suction pipes, resulting in a wetting of the wall and poor fuel preparation, that is to say a

  insufficient atomization and vaporization.

  The object of the invention is to provide a training device

  tion of the mixture of the aforementioned type so that it is suitable for supplying the fuel mixture to an internal combustion engine, with good distribution of the mixture and good

preparation of it.

  This object is achieved in accordance with the invention by the fact that

  the suction pipes of the mixture going to the suction pipes-

  piration each have a projecting venturi section

  in the opening of the suction ducts, in which

  block respectively an injection pipe of the valve

fuel dosing.

  It is possible to obtain with the mixture forming device of the invention, in particular in conjunction with an electronic control device and a controlled fuel metering valve - 3 -

  by the latter, an extremely precise distribution of the mixture

  fuel to the individual cylinders, resulting in the supply to the engine of a fuel-rich mixture which

  has been set so far for the poorest cylinder

  can now be significantly lower in fuel

  rant. This results in the known fuel economy advantages.

  rant, better ease of driving vehicles equipped with the engine and exhaust gases lower in harmful substances. The device of the invention is significantly more economical than devices fitted with several fuel metering valves.

  The invention will be clearly understood on reading the description

  detailed, given below by way of example only, of a

  embodiment shown schematically in the

  sin, in which: FIG. 1 is a schematic representation of an internal combustion engine equipped with the device of the invention; and Figure 2 is a section through the dispenser section of the

  second air intake duct fitted with the metering valve

fuel age.

  FIG. 1 represents an internal combustion engine 1 with an air suction duct 3 comprising a throttle valve

  2, from which the suction pipes 4 go to the cylinders

  individual dres of motor 1, a second suction duct

  air 5 fitted with an intentionally actuable throttle valve-

  ment 6 to which is coupled in register the throttle valve 2 of

  first air intake duct 3. From the second intake duct

  air piration 5 leave the suction pipes of the mixture

  7 going to the suction pipes 4, which pipes 7 include

  each carry a portion of venturi 9 projecting into the or-

  vertices 8 of the suction ducts 4 and in section -4-

  narrowest flow from which the respective outlet-

  an injection line 10 of a car metering valve

  burant 11. Upstream of the gas butterflies 2.6 the conduits

  air intake 3.5 meet in a duct 12 in the-

  what is arranged a known device 13, not described, for

finish the amount of air sucked.

  The fuel metering valve 11 which can be seen in FIG. 2 is controlled by an electronic control device 14 in

  depending on the amount of air drawn in and other pa-

  engine and environmental rameters.

  Figure 2 shows a section through the metering valve.

  fuel age 11 arranged in a distributor section 15

  of the second air suction duct 5 and comprising a chamber

  bre 16 filled with fuel which is connected by a pipeline

  fuel 17 at the delivery of a fuel pump

  not shown, and by a return line 18 to a

  fuel tank not shown. A valve body 19 projecting into the chamber 16 controls the injection pipes leading into the venturi portions 9 and arranged upstream of a valve seat 20, and into which the fuel under pressure is injected when the valve body 19 rises from the valve seat 20. The high speed of the air in the narrowest section of the venturi portions 9 causes atomization of the fuel, which is then transported with the air in the openings of the suction conduits 4, o it is once again driven in a vortex and atomized before entering the suction ducts 4 if there is also a high air speed therein, the air flow being

  high and the throttle valve 2 is open.

  Opening the butterflies of the 2.6 coupled gases in the register

  takes place so that at idle and under partial load

  engine, only the second throttle valve is

  green, and, at higher partial load and at full throttle,

  the two gas butterflies 2.6 are opened with as a consequence

  - 5 - that, for both types of operation, there is

  high air velocities in the venturi portions 9.

  The throttle valve 2 can be opened here mechanically.

only or pneumatically.

- 6 -

Claims (1)

Claim.   Mixing device for combustion engines   internal tion (1) with several cylinders, comprising an air suction duct (3) provided with a throttle valve (2), from which the suction ducts (4) lead to the individual cylinders, a second air intake duct (5) provided   a throttle valve (6) which can be operated intentionally-   Lement, from where the suction pipes of the mixture (7) go to the individual suction pipes (4), the throttle valve of the first air suction pipe being coupled in   register with the throttle valve of the second suction duct   air, and a fuel metering valve (11), charac-   terized in that the mixture suction pipes (7) are   lant to the suction ducts (4) each have a door   tion of venturi (9) projecting into the opening (8) of the suction conduits (4) and into which opens respectively an injection conduit (10) of the fuel metering valve (11).