FR2579271A1 - INJECTION DEVICE FOR INTERNAL COMBUSTION ENGINES - Google Patents

Abstract

THIS DEVICE IS OF THE TYPE WHICH INCLUDES, FOR EACH CYLINDER, IN THE CYLINDER HEAD, TWO SEPARATE INTAKE MANIFOLDS. THE INDIVIDUAL MANIFOLD 1 OF EACH CYLINDER IS DIVIDED, IN THE CYLINDER HEAD REGION, INTO TWO SECTIONS SEPARATED 2, 3 BY A BULKHEAD 4. AN INJECTOR 11 IS MOUNTED ON THIS MANIFOLD UPSTREAM OF THE BULKHEAD. TO STABILIZE ENGINE ROTATION AT IDLE AND REDUCE NOISE EMISSIONS AT LOW SPEEDS, EACH CYLINDER INCLUDES AN ADDITIONAL INJECTOR 6 DOWNSTREAM OF THE FIRST INJECTOR 11, IN THE BULKHEAD REGION, TO INJECT FUEL INTO A MIXING CHAMBER 8 BULKHEAD 4 AT IDLE AND PARTIAL LOAD. FOR THE SUPERIOR PARTIAL LOAD AND TOTAL LOAD SPEEDS, INJECTOR 11 IS SWITCHED ON ABOVE ADDITIONAL INJECTOR 6. APPLICATION TO THE FIELD OF INJECTION ENGINES FOR MOTOR VEHICLES.

Description

-1-

  The invention relates to an injection device

  for an internal combustion engine comprising two

  separate intake ducts, for each cylinder head,

  and comprising, for each cylinder, an individual collector

  dual intake manifold for both inlet ducts which is subdivided into two separate manifold sections by means of a partition in the region of the cylinder head, and further comprising a general intake manifold connected to each of the individual manifolds intake,

  as well as two injectors associated with each of the said

individual intake units.

  DE-A-24 14 022 discloses a fuel supply device for a spark ignition internal combustion engine, which comprises two intake valves per cylinder. From the intake manifold of the

  internal combustion engine, from the collectors indicated

  admission videos, in each of which is arranged a

  fuel valve, and which lead to the intake valves

  if we. With this structure, it is planned, for each

  lindre, a first intake valve associated with the main combustion chamber, and a second intake valve associated with a secondary combustion chamber

  which is in communication with the primary combustion chamber

  by a channel of flame. In the secondary combustion chamber is arranged a spark plug which ignites the constant fuel-air mixture. By means of the forehead

  flame which is led from the combustion chamber to

  to the main combustion chamber through the flame channel, the fuel-air mixture present in

  this room, and adapted to the variable operating conditions

  combustion engine is ignited.

  However, with this structure, a disadvantage lies in the fact that, in the upper range of values -2-

  of the load and the lower range of the diets of the

  internal combustion engine, the fuel-air mixture is

  not sufficiently mixed, because of the low vi-

  flow rate of the air sucked into the collector

  of admission and because of the remoteness of the

  fuel valve with respect to the distribution valve

  of gases, which leads to fluctuations in

  rotational speed and unpleasant sound emissions.

  Already known from the German magazine Engine 11/84, an internal combustion engine equipped with an injection device in which two separate intake ducts are assembled, for each cylinder, in an associated individual intake manifold . A partition disposed in the individual intake manifold in the region of the cylinder head subdivides said individual manifold into two separate manifold sections. An injector is arranged in the individual intake manifold upstream of the partition. Due to the layout of the injector,

  the internal combustion engine does not have a

  satisfactory response in an unsteady state, and this makes it more difficult to

exhaust gas.

  Furthermore, it is known from the GB

  1,351,771, an intake device for a combustion engine

  internal system, which includes a general collector of

  From there, there are individual manifolds that lead to the cylinder intake valves. Fuel injectors are arranged in the individual collectors,

  upstream of the gas distribution valves. In the col-

  general admission reader, there is a car injector

  multi-hole fuel which is used for the supply of fuel

  during idle operation.

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  A disadvantage is the mediocre

  of the internal combustion engine in response to changes in

  and in the poor running in the lower range of rotational speeds, which is attributable to the position of the multi-hole fuel injector remote from the distribution valve of the valves.

  gas and its installation in the general

  if we. During idling operation, the speed of

  the air in the general intake manifold is too small

  to generate in the combustion chamber

  bulences that are sufficient to stir the fuel-air mixture. The object of the invention is to ensure that the mixing of the fuel-air mixture in the intake manifold is of a constant quality, even already in

  the lower range of loads and rotational speeds

  internal combustion engine.

  According to the invention, this problem is solved by the fact that a first injector is arranged in the region of

  the partition from where the fuel is injected, at the rate of

  lenti and partial load, in a mixing chamber located inside the partition, and is sent from this chamber in the two sections of collector, and in that,

  for the amount of fuel required for the fuel

  partial upper and at full load, the other injector, which is mounted upstream of the bulkhead,

is also put into action.

  According to another characteristic of the invention, an idle air channel, which starts from the underside of the

  individual intake manifold passing through the

  sound, opens into the mixing chamber.

  According to another characteristic of the invention, projection channels are arranged in the extension of the median longitudinal axis of the first injector, and in a V arrangement.

  The injection device according to the invention

  the advantage residing in the fact that the injector provided for the idle and partial load and

  which is close to the pre-dispensing gas valve

  feels an idle air channel in which the air sucked

  reaches a high speed, which guarantees a good arm-

  wise of the mixture fuel-air in the cylinder, and so that one obtains a reduction of the noise emissions at the idle speed. Due to the fact that the fuel injector is swept intensively by the sucked air, there are no fuel residues on the fuel injector or in the mixing chamber. The fuel-air mixture for the idling speed is thus constantly homogeneous, so that the idling speed of rotation stabilizes,

  and this speed can be set to a lower value.

you.

  Other features and advantages of the invention

  will be better understood in the light of the description

  which follows and appended drawings, relating to a preferred embodiment, with reference to FIGS.

  FIG. 1 represents an individual collector of

  sion of an internal combustion engine injection device, in axial longitudinal section; - Figure 2 shows a section of the individual collector along the line II-II of Figure 1; and

  FIG. 3 represents the zone of reception of the injection

  fuel tank, according to section III-III of the

figure 1.

  In Figure 1, an individual collector of

  part of a suction device (not

  presented) of a four-point internal combustion engine

  The distribution of gases per cylinder is designated 1, this manifold being mounted on the cylinder head at the intake ducts. Upstream of the outlet of the individual collector 1, is arranged, parallel to

  the axial extension of said individual collector 1, a partition

  its 4 which subdivides the individual collector 1 into one

  left 2 and right 3 of the collector

  individual admission. Partition 4 extends into the

  axial rection, up to the vicinity of the middle of the individual intake manifold 1. In the vicinity of the outlet of the individual intake manifold 1, provision is made in the

  partition 4, a region for receiving a first injection

  fuel tank 6 simply indicated schematically in the drawing. The median longitudinal axis 7 of the first injector

  6 is pointed at the fuel valves

  mission (not shown). Projection channels 13,

  14, provided for in Part 4, are arranged in the

  of the median longitudinal axis 7, and connect the area

  left 2 and the right-hand region 3 of the individual collector

  dual admission to a mixing chamber 8 located in front of the injector 6 and formed by the projection channels 13, 14, and in which opens an idle air channel 9 which passes into the partition 4. The projection channels 13

  14 are entering sections 2, 3 of the intake manifold

  directly in the region of the junction formed between the cylinder head and the individual manifold 1, in the region of the central longitudinal axis 7. The idle air channel 9 passes through the wall of the individual manifold 1,

  to the opposite side of the fuel injector

  6. The idle air channel 9 is dimensioned

  the fact that, in the case of an internal combustion engine with a power of 136 kW, and a displacement of 2299 cm3, the air flow reaches a speed of approximately 120 m / s, so

  that a mass flow of about 14 kg / h can be passed.

-6-

  Upstream of the partition 4, there is a housing 10 for

  see a second injector 11, simply indicated schematically

  in Figure 1, and which can be put into action

  in addition, at full load. The long axis

  The central dinal 12 of the fuel injector 11 is also pointed in the direction of the intake valves (not shown). The individual intake manifold 1, shown

  longitudinal section in Figure 2, is sub-

  divided by the partition 4 into a left 2 region and a

  intake manifold right area 3. In the room

  its 4, is arranged the idle air channel 9 which passes through the wall of the individual suction tube 1, to the side

  which is the opposite of the fuel injector 6.

  The region 5 for mounting the first fuel injector 6 is shown in FIG. 3. The individual intake manifold 1 is subdivided by the partition 4 into

  the left and right collector regions, 2, 3 res-

  tively. The projection channels 13, 14, which present

  the same section area, connect the regions of

  left and right 2, 3, from the individual collector to the in-

  fuel jector 6, and form in front of this injector a mixing chamber 8 into which also opens the idle air channel 9. The axes 15, 16 of the projection channels 13, 14 intersect on the central longitudinal axis 7 in the mixing chamber 8, and are arranged in V one

  relative to the other, with an angle equal to or equal to

  lower than the cone angle that is formed by the fuel at

  the output of the fuel injector 6.

  According to another embodiment, not shown

  of the invention, the idle air channel may also be disposed in the region of the fuel injector, the end region of the injector being directed to

  the suction air is then swept by the sucked air.

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Claims (3)

  1. Injection device for a combustion engine   internal arrangement comprising, for each cylinder, two separate intake ducts, and comprising, for each cylinder, an individual intake manifold for the two channels   of admission and which is subdivided into two sections of   separate reader by means of a partition in the region of the cylinder head, and also comprising a collector   general admission to each of the individual collectors   dual intake and two injectors associated with each of said individual collectors, characterized in that a first injector (6) is arranged in the region of the partition (4) where the fuel is injected at idle speed and partial load, in a mixing chamber (8) located inside the partition (4) and is sent from this chamber into the two collector sections (2, 3), and in that, for the quantity of fuel required at the higher partial load regime and the full load regime, the other injector (11), which is mounted upstream of   the partition (4) is also activated.   2. Injection device according to claim 1, characterized in that, in the mixing chamber (8), opens an idle air channel (9), which starts from the face   lower of the individual intake manifold (1) in steps in the partition (4).   3. Injection device according to claim 1, characterized in that projection channels (13, 14) are arranged in the extension of the median longitudinal axis (7) of the injector (6), and according to a provision in V.