DE1476214B - Device for supplying additional air into the intake duct of an internal combustion engine - Google Patents

Description

Via a throttle valve 7, additional air is guided to the various annular channels 5 in such a way that this is passed through a pipe 8 in the direction of the arrow, which is located in the exhaust flow and is heated will. From the ring channel or several ring channels 5 from which the air enters the mixing chamber 4 only one is shown.

A channel 9 leads from the pipe 8 to the mixing chamber 4. The throttle valve 7 is on a shaft 10 attached, on which there is a lever 11 which is connected to the carburetor. One not The regulating screw shown is at the level of the throttle valve 7.

The device works as follows: The fuel condensate migrates in the intake pipe to the cylinder and has to pass through the interposed mixing chamber 4. Most of the condensate is, however, in the lower half of the mixing chamber 4. By means of a regulating screw (not shown) in the area of the throttle valve 7, the volume is controlled and heated additional air is introduced into the lowest area of the mixing chamber 4 via the annular channel 5. It first emerges from the annular channel 5 via the lowest bores 6. The more the throttle valve 7 is opened, the more the additional air has to exit via the further bores 6, which go to the right and left of the bore 6 α starting approximately to the middle.

Since the passage opening of the inlet valve 7 is approximately the same as the passage of the throttle valve of the carburetor is enlarged, hot additional air flows to the extent and area of the intake pipe wall out of the bores 6, in the fuel condensate over the tear-off edge of the mixing chamber 4 flows towards it.

The mixture heating in the lower partial load range does not have a disadvantageous effect, since the lower one Filling level only leads to a loss of performance in the upper speed and load range.

The inlet flap 7 is practically closed in the idle position of the carburetor. But there already If hot additional air is to enter in idle to prepare the condensate, this amount is over a regulating screw, not shown, finely adjusted.

When the device described is subsequently installed in the intake system of a mixture-compressing Internal combustion engine, it is necessary to adjust the carburetor in the direction of a more fuel-rich one To change the mixture, since additional air is supplied from idle mode.

1 sheet of drawings

Claims (1)

1 2 either completely closed or completely open. Claim: Here, too, there is no fine adjustment of the additional air possible. Device for supplying additional air in A similar regulation is through the French Intake duct of an internal combustion engine 5 sische patent 543 319 known, in the case of Downstream of the arbitrarily actuatable full throttle, an opening for additional air is completely open organs and the outlet of the idle is mixed while they are closed in idle mode canal of a carburetor, one of which remains sharp. Here is a preparation of the condensate in the Air outlet openings with tear-off edge, idle and low power range through exclusive In the partial area of the intake ίο additional air not possible. channel circumference are arranged from the focal starting from a device of the initially Fabric condensate is coated and the one specified type is the object of the invention Has quantity control device, which is actually based on such a device so on connection with the actuation device for zubilden that the supplied additional air volume through the throttle member is in such a way that the supplied 15 arrangement of the additional air openings in the intake duct Additional air volume corresponds to the amount of condensate, for fine adjustment to the amount of condensate characterized in that the air passes. outlet openings starting from one at the wide- This object is achieved according to the invention Most downstream outlet opening (6) is solved that the air outlet openings starting from rising evenly to the right and left, 20 of an outlet opening that is furthest downstream over about half the circumference of the intake duct increasing evenly to the right and left, wall extend. over about half the circumference of Ansaugkanal- r wall extend. This ensures that according to the 25 pressure ratios in the intake duct that include a Criterion for the accumulation of fuel condensate are, initially, additional air only over the furthest downstream openings emerges. By the Inflow of additional air over the furthest 30 downstream openings are broken down The invention relates to a device for supply negative pressure in the intake duct and thus prevails guidance of additional air into the intake duct of one of the openings further upstream of a ge internal combustion engine downstream of the arbitrarily lower pressure difference between the additional air duct and the throttle element that can be activated and the opening of the ^ and intake ducts as at those further downstream Idle mixture duct of a carburetor, one of which has 35 openings, so that inevitably different sharp-edged tear-off edge exhibiting Luftaus- Amounts of additional air depending on the altitude of this outlet openings emerge exclusively in the partial area of the openings. The differences in the out-intake duct circumference are arranged, the amount of additional air entering are swept by that in the fuel condensate and the pressure prevailing in an intake duct determines the Has quantity control device, which in active connection 40 is a parameter for the total inflowing connection with the actuating device for the set air volume. Throttle body is in such a way that the supplied supply air thus emerges in each case from openings set air volume corresponds to the amount of condensate. off, in the area of which with maximum condensate accumulation, In a known such device is to be expected. As a result, the V_ (German Auslegeschrift 1115 525) the inlet 45 openings maximum atomizing air is available, set air through a nozzle into the intake duct, which is pressurized by the fuel condensate, about a third of the clear width of the intake duct. This ensures optimum post-atomization protrudes into this at this point. Upstream of the downstream of the idle mixture nozzle precipitated At this point of opening, the intake duct is reached around NEN fuel condensate, which makes it optimal 90 ° bent. The nozzle opens into the outer wall 50 combustion ratios can be achieved somewhat downstream of this bend. The invention is described below on the basis of one Danger that condensate is explained in more detail upstream of the exemplary embodiment. It shows The nozzle foot accumulates and from there into non-con- F i g. 1 shows a device according to the invention in trolled amounts of time fluctuating carried away cut that cut directly on the cylinder block between this will. 55 and the intake manifold can be used, Both the intake duct and the one in the nozzle F i g. 2 the in F i g. 1 mixing chamber shown in opening ducts for the additional air each have a top view, a throttle valve that mechanically F i g. 3 shows a section along the line III-III of FIG are rigidly connected to each other, so that both F i g. 2 and Throttle valves are moved synchronously. A fine 60 F i g. 4 shows a section along the line IV-IV of FIG regulation of additional air depending on the actual F i g. 2. The accumulation of condensate is therefore not possible. Much- The illustrated single intake duct 3 contains more is the additional air always at the same time with a mixing chamber 4, which is an annular channel 5 and in Pressing the accelerator pedal supplied. the lower part has outlet bores 6. This In another known additional device (French outlet bores 6 are about half the Sische Patent Specification 1 341 680), a valve is also distributed to the mixing chamber 4. F i g. 4 shows that if synchronized with the throttle via a linkage, this is the lowest, d. H. furthest downstream flap of the intake duct controlled. This valve has a horizontal outlet opening 6 a .