DE2034967A1 - Shutdown device for internal combustion engines fed by carburettors with double housings - Google Patents

Description

GVB / VT / 17129 _{patent attorney0}

7. 7> 1970 Dipl.-Ing.Leinweber

Diploma in carpenter

Munich 2, Resentol? ,

Tel. 261989

SOCIBTE DES AUTOMOBILE SIMGA.

"Shutdown device for internal combustion engines fed by double-casing carburettors."

The present invention relates to a shutdown device for an internal combustion engine or an internal combustion engine »that of a carburettor with a double housing cdgl. fed with fuel "or" is supplied. . . . .....

The modern, high-performance internal combustion engines with iitihsm. The compression ratio shows the specialist part that they continue to run idle for a certain period of time if the ignition is set * or switched off. " This time can sometimes be quite long leg. The phenomenon which occurs while the ignition circuit is open or subdued is referred to as self-ignition. -

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A well-known method that is used camouflages this process to avoid, consists in the interruption or shutdown of the gasoline supply or in the shutdown of the gasoline supply in the Idle circuit of the carburetor using a valve needle installed in the idle line of the carburetor = existing electromagnetically controlled valve, this valve needle is operated by an electromagnet »

During operation of the internal combustion engine, the Electromagnet energized or energized or supplied, the solenoid valve is open and the fuel can therefore pass the Leerlaiafleitung flow through. When the ignition contact of the internal combustion engine is switched off or open, the current that feeds the solenoid valve is also interrupted so that the latter is closed and the Fuel is no longer circulating in the idle circuit of the carburetor can be. The internal combustion engine that no longer runs on fuel is worried, then stops.

The invention relates in particular to high-performance internal combustion engines which are fed by a double-housing carburetor. In a carburettor with a double housing, there are two idle circuit e. If one achieves the standstill of the internal combustion engine by means of the known method just described, it is therefore necessary to provide a doubling of the disconnection devices; in other words it requires two electrical ones Provide parallel controlled solenoid valves arranged in each of the two idle lines of the carburetor. We know that the normal richness of a mixture in an idle circuit is usually about 1.30 »This richness is defined as the ratio between air and fuel used by taking as a reference a ratio of 1 assumes when the relative air and fuel amounts of a "fcheoreti.look correspond to perfect combustion, "

Under these circumstances, if one applies known principles and if one only provides a single locking element la one of the idle circuits in a carburettor with a double housing, one can conclude that with such a device after switching off the ignition contact, i.e. the internal combustion engine 'would be fed with a richness of about 0.69 (i.e. half of ί _{5 30).} However, it is known to the faehwelt that there is a need to avoid the side-east ignition process; favored.

In a very surprising way, one has. however found that, if you have a single one in one of the two idle lines Carburetor with double housing arranged storage or. Locking member used to interrupt the fuel supply, one reaches the immediate shutdown of the engine in a way that has not yet been clarified.

It is possible that this standstill is caused by a temporary process between the feed ratios during normal operation of the internal combustion engine and an operation with depleted feed ratios. Anyway, allows to effect an immediate shutdown of the internal combustion engine of the present invention discovered unexpected operation, a significant saving by using only a single automatic shutdown device instead of the normally required for ^we i ^"to achieve and to reduce the overall dimensions of this device. This last advantage is of considerable interest, since the carburettors with double housings already have a very complicated structure with a large space requirement.

The invention is explained in more detail with reference to an exemplary embodiment shown schematically in the only accompanying drawing.

The carburetor with double housing includes a float housing 1 whose float is visible at 11 and the fuel 10 through a line 13 to the two in the constrictions of the Venturi tube ^ 15, 15 'of the two housings 16, 16 · of the carburetor arranged nozzles feeds. The passage cross-sections of the inlet lines for the The flammable gaseous mixture-forming housings 16, 16 are in Parallel connection at the same time by two inlet throttle valves or rotary vanes 17, 17 'from the foot pedal (not shown) or accelerator pedal can be controlled or actuated.

When the throttle or rotary flaps 17, 17 'close the passage cross-section of the pipes 16, Ί6 ¹ , the fuel supply • to the idling internal combustion engine is ensured by two overflow ducts or bypasses or secondary ducts 18, 18 * which bypass the rotary flaps 17, 17'.

In order to prevent the self-ignition process after switching off the electrical Supply or opening of the ignition contact of the internal combustion engine avoid, the arrangement of a single solenoid valve 19 in the idle channel 18 is provided according to the invention. The arrangement is designed such that when the ignition contact of the internal combustion engine

009885/1589

is switched on * the solenoid valve 19 is energized or fed ,, whose plunger 20 is attracted and the valve slide 21 of its seat 22 is lifted to release the channel 18 as shown in the figure.

If the ignition of the internal combustion engine is switched off, it will Solenoid valve 19 is no longer energized or fed, so that the valve slide 21 rests against its seat 22 and the channel 18 is closed or is blocked.

The channel 18 'remains free, but surprisingly you find that, contrary to all expectations, if you switch off the ignition, the internal combustion engine stops immediately because it is no longer subject to the auto-ignition processes that normally occur occur with persistence because of an ato-enriched through the only existing idle channel 18 'caused fuel supply.

The invention is of course not limited to the embodiment described and the actuating means for Closure of the locking member can in particular be of any suitable type. The electromagnet that closes the valve needle could in particular, as desired, by one with the shift actuation device the ignition of the internal combustion engine connected or disconnected mechanical device can be replaced. The invention therefore includes all technical means that are equivalent to the described and their combinations, insofar as they are equivalent are carried out within the meaning of the invention.

009885/1589

Claims (1)

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SOHUTZANSPRU I. .0 HE one fed by a double-casing carburetor Internal combustion engine, a shutdown device for prevention the operating activity after the electrical ignition circuit has been interrupted with fuel through the idle lines of the carburetor powered internal combustion engine, characterized in that the device has a single locking member (21). to interrupt the Fuel supply has "which locking member in only one (18)" of the two idle lines (18, 18) of the carburetor (G) is arranged, whereby the closing of the SperrglJede® (21) causing © actuating means (19) are provided at the same time as switching off of the ignition circuit of the internal combustion engine operated to who & esu 2 »Device according to claim 1, characterized in that the locking member (21) and the actuating means in anrieh known consist of an electromagnetically controlled valve (19), its electrical supply or excitation by the switching device of the ignition circuit is guaranteed. 003885/1589 Le e rs e if