DE2204959A1 - Internal combustion engine with spark ignition - Google Patents

Description

DIPL.-1N6. DR. IUR. . DIPL.-INS.

VOLKER BUSSE DIETRICH BUSSE

45 OSNABROCK, February 2, 1972

MDSERSTRASSE 2O / 24 VB / Fl

BRITISH LSYLAND (AUSTIN-MORRIS) LIMITED Longbridge _s Birmingham, England .

Internal combustion engine with spark ignition

The invention relates to spark ignition internal combustion engines.

Modern high-compression internal combustion engines with spark ignition tend to have the phenomenon of "running on" after switching off the ignition. This tendency is the application of retarded ignition at idle (causing a higher degree of opening the throttle valve requires sufficient than otherwise to achieve the required idle speed would) in connection with the use of fuel with a lower octane content than recommended for the relevant engine, attributable to.

The object of the invention is to preclude the occurrence of the engine running, namely by that an automatically acting device for interrupting the fuel supply to the intake or suction system of the engine during the period of its continued

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turning (due to the energy stored in the flywheel) is provided after switching off the ignition.

To this end, according to the invention, a spark ignition internal combustion engine having a fuel delivery system with a Fuel chamber with constant level or constant pressure gradient has, from the liquid fuel to a supply device which discharges this into the intake or intake system of the engine equipped with an automatic valve that can be operated after the engine is running and when it is switched off the ignition responds to the opening of the ignition switch and operates in such a way that

a) no longer a free space within the fuel chamber normally vented but is subjected to a suction force sufficient to cause a supply of fuel from the chamber to prevent for substantially that entire period of time during which the engine is still after the ignition is switched off continues turning, and

b) normal venting of the fuel chamber after unscrewing of the motor is resumed or restored.

According to a first preferred embodiment of the invention is a spark ignition internal combustion engine that includes a fuel delivery system with a carburetor with a fuel chamber constant Level or constant pressure gradient, characterized by:

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a) a valve with a valve inlet, a valve outlet and a valve channel;

b) with a free space inside the fuel chamber the first line connecting the valve channel;

c) a second conduit connecting the valve inlet to a vent;

d) a third line connecting the valve outlet to an evacuation device; and

e) a control device for the valve, which causes the valve inlet with the valve channel when the engine is running normally and when the engine continues to rotate after the ignition has been switched off, the valve channel is connected to the valve outlet.

According to the invention, the first line or also the second line can have an evaporation loss container.

The control device preferably consists of an electromagnet with an associated circuit that, after the engine has been running, switches the valve over from one of the

j valve inlet with the valve channel connecting first position I

j is effected in a second position connecting the valve channel to the valve outlet. The circuit advantageously comprises a switch for the lubricant pressure of the engine, which is activated when the

! the lubricant pressure of the engine below a predetermined

- ■

th value energizes the electromagnet for switching the valve from the second to the first position.

According to yet another feature of this first preferred embodiment

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220A959

; embodiment of the invention consists of the evacuation device

: from the carburetor or an intake pipe to the engine.

' According to a second preferred embodiment of the invention

j is the valve for a fuel supply system of a

internal combustion engine with a carburetor with fuel chamber constant j

j levels or constant pressure gradient from:

j a) one forming an inlet, an outlet and a channel

Body;

j b) a first valve seat arranged between the inlet and the channel;

j c) a second arranged between the channel and the outlet

I valve seat;
ι

'd) a valve stem supporting two valve parts in such a way that at ! a valve part of the channel sitting on the first valve seat and the outlet and when seated on the second valve seat

I other valve part of the inlet and the channel with each other in

I connect;

! e) a spring that biases the valve stem into a position,

'· In which the other valve part rests on the second valve seat

I sit; and

j f) a control device that controls the biasing action of the spring j and causes the valve part to sit on the first valve seat.

Several embodiments of the subject invention are in the following description in conjunction with the drawing

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described in more detail. In the drawing show:

Fig. 1 is a schematic representation of a first fuel supply system for a fuel according to the invention Combustion engine or;

] Fig. 2 is a schematic representation of a second such system; and

3 shows a valve built into the system according to FIG

on average.

In the embodiment according to FIG. 1, gasoline 11 or the like passes from a carburetor float chamber 12 through an opening 15 to the Throttle valve bore 13 of a carburetor 14. The size of the opening 15 is regulated by the position of a conical needle 16 ^ its position in relation to the opening in a known manner a piston 17 can be changed.

A free space 18 present above the gasoline 11 in the float chamber 12 is connected by a pipe 19 or the like automatically operating engine continuation interrupt valve 20 connected. The valve 20 is through a pipe 21 with the throttle valve bore 13 and is vented into the atmosphere through a pipe 22. In the present case, the pipe 22 is available Limiting possible air pollution by means of an evaporative loss canister 22a in connection with the atmosphere.

The valve 20 has a solenoid 23 which has a bore

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. Forms, within which a piston 25 is arranged displaceably. On the other piston 25, a flexible valve head 26 is attached. To the When the valve head 26 is pressed against a valve seat 28, the piston is pretensioned by a compression spring 27. In this position the free space 18 is via the tube 19, the openings 29 and 30 within the valve 20, the tube 22 and the vaccination canister 22a vented to the atmosphere. The electromagnet 23 is connected to a battery 32 via a switch 31; he is still Grounded via a switch 33 responsive to oil pressure. When the engine is running, switch 31 is open and switch 33 is open is kept closed at normal engine oil pressure. The electromagnet 23 is consequently not energized and the piston 25 is pressed or tensioned in a free manner by the spring 27 to hold the valve head 26 on the valve seat 28. Since the Atmospheric pressure is higher than the pressure prevailing in the throttle valve bore 13, through the connection of the free Space 18 with the atmosphere and with the opening 15 the fuel pressed by the float chamber 12 into the bore through the opening 15. The respective fuel supply to the engine is conventional Manner depending on the operation of the conical needle 16.

When the engine is switched off, the switch 31 is closed, whereby the piston 25, due to the action of the magnetic field created by the current flowing through the electromagnet, is retracted against the action of the spring 27, so that the valve head 26 lifts off the valve seat 28 and then the opening 29 seals. In this way, the free space 18 is connected to dej? .BAhrujig 13 through the valve 20 and the pipe 21. Since the

Area of the throttle valve bore 13 into which the pipe 21 opens, is located in the vicinity of the opening 15 is now practically there is no longer a pressure difference that would force fuel out of the float chamber 12 into the throttle valve bore effected via the opening 15. Accordingly, no run through more fuel to keep the engine running.

Although the pressure-sensitive switch 33 after turning off the If Xotors remains closed for a short time, the oil pressure drops

ί the motor gradually until the pressure sensitive switch

j 33 opens and so an opening of the battery encompassing

Electric circuit of the electromagnet caused. The electromagnet

is then de-excited and the piston by the spring 27 on the! Valve seat 28 pressed, whereby the free space 18 over the pipe J 22 is opened to the atmosphere. That way it becomes

Valve 20 is reset and enables the fuel! supply when the engine is subsequently started.

In the embodiment shown in FIG. 2, parts with the same function as in FIG. 1 have the same reference numerals and are not described again as such. The free space 18 in the float chamber 12 is connected to the evaporation loss container or canister 51 by a pipe 52. The canister 51 contains a mass of carbon grains 53, which serve to delimit free spaces 5 ^ and 55 above and below the grains 53. In addition to the tube 52, a tube 56, which is known from the rocker arm housing cover 57 of the combustion engine 58, and a tube 56 from the free space above the combustion

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Substance in the fuel tank 60 coming pipe 59. From the lower free space 55 of the canister 51, a pipe 6l leads to the valve 20th

The piston 25 of the valve 20 is under spring tension by the compression spring 27 and presses the valve head 26 against the valve seat at. In addition, the piston 25 carries a further valve head 62 which comes into contact with a valve seat 63 when the pretensioning action the spring 27 is canceled or overcome by the flow of current through the electromagnet 23. One outlet 6 ^ of the valve 20 connects one inside the valve body formed space 65 by a line, not shown, with an inlet pipe 66. The valve opens to the atmosphere an inlet 67.

When the engine 58 is running, the switch 31 is open and the oil pressure switch 33 is kept closed. The electromagnet 23 is consequently not energized and the piston 25 is tensioned by the spring 27 to cool the valve head 26 on the valve seat 28. The pressure prevailing in the space 55 of the canister 51 is equal to that within the line 61, which opens into the atmosphere via the inlet 67. The pressure prevailing in the space 5k is slightly lower than the pressure prevailing in the space 55 due to a pressure drop in the granules 53, but is still higher than that in the bore 13 of the carburetor Ik Pipe 52 acts in such a way that it presses fuel 11 through opening 15 into bore 13. When the ignition is switched off, the switch 31

closed, whereby the piston 25, as a result of the action of the magnetic field created by the current flowing through the electromagnet, is withdrawn against the action of the spring, so that the valve head 26 lifts off the valve seat 28 and a subsequent. the valve head 62 is then placed on the valve seat 63. As a result, the line 61 and thus the space 55 in the canister 51 is connected via the outlet 64 to the vacuum normally existing in the inlet pipe 66. The resulting pressure drop across the mass of granules 53 creates a pressure reduction in space 5 ² J and thus sucks fuel vapors present in pipes 56 and 59 and in particular in pipe 52 into free space 5 ^ and further into granules 53. The granules are used to trap the fuel vapors. In addition, the pressure drop pressing the fuel 11 through the opening 15 into the bore 13 is reduced, with the result that no further fuel can pass through for the engine to continue running.

As described in connection with the first embodiment, the pressure-sensitive switch 33 remains closed after switching off the ignition until the oil pressure of the engine falls below a fixed value decreases. The switch 33 then opens and causes the electromagnet 23 to be de-excited.

The piston 25 is then tensioned by the spring 27 and presses the valve head 26 onto the valve seat 28 and the valve head 62 forward valve seat 63 away, whereby the line 6i via the inlet 67 is opened to the atmosphere.

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It goes without saying that in the embodiments according to FIGS 2, no continuous current draw from the battery 32 is required while the engine is running. The electromagnet 23 is only excited by a current that flows in the relatively short period of time j between switching off the ignition and the fall of the The engine oil pressure is significantly below a value that could be maintained if the engine continued to run.

FIG. 3 shows details of the valve 20 according to FIG the same parts are provided with the same reference numerals in both figures. The valve 20 consists of a body 8l on which the Electromagnet 23 is seated by means of a plate 82. The electromagnet is held by a pressed metal cap 83 on the valve body 81, through the isolated connections 84, 85 of the Electromagnet protrude. The spring 27 is protruding through a the pin 83a is supported in the cap 83. The valve body 8l has a valve channel 86. As shown, the valve head seals 26 from the valve seat 28 so that the outlet 64 is blocked and the channel 86 is in communication with the inlet 67. When passing through a current through the electromagnet 23 via the connections 84, 85, the piston 25 is raised, so that the valve head 62 comes to sit on the valve seat 63 and the valve head 26 lifts off the valve seat 28. This causes the Inlet 67 opposite channel 86 and brings the latter over a space 65 with the outlet 64 in communication.

The purpose of making a normal float chamber vent

after the engine has been switched off and its oil has sunk 8 - ■

pressure is the entry of gasoline vapors from the float chamber into the inlet pipe, which causes the engine to start can make it difficult to exclude in hot suction conditions.

When used on engines with constant speed carburetors are equipped, which extends through an area of essentially constant negative pressure between the starter flap and the throttle valve, this area can be used as the evacuation means for use on the float chamber be preferred.

In the case of carburetors (or other supply devices) that do not have a constant negative pressure range, this can occur if 'The inlet pipe negative pressure as evacuation means or discharge

', it may be necessary to reduce the existing negative pressure by means of a special

j facility, such as B. one from the atmosphere into the valve chamber leading small hole to be tapped and thus dismantled, since the

Application of the full negative pressure to the float chamber! Generate boiling or another transfer of fuel into

! can cause the inlet channel, which is undesirable in this context is.

At Vergasersehwimmerkammerη with a different ventilation source than atmospheric pressure is this source with the valve chamber tied together.

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Claims (8)

Patent claims: Internal combustion engine with spark ignition, which has a fuel supply clock system r. with a constant level fuel chamber or includes constant pressure gradient or pressure head, from the liquid fuel to one of these in the inlet or suction system of the Motor discharging feed device can be passed, characterized by an automatic valve (20), which after Running the engine and when the ignition is switched off responds to the opening of the ignition switch and works in such a way that a) a free space (18) within the fuel chamber (12) is no longer vented normally, but rather a suction force is subjected to sufficient supply of fuel from the chamber for substantially that entire period of time to prevent the engine from turning after the ignition is switched off; and b) normal venting of the fuel chamber after unscrewing of the Kotors is resumed. 2. Spark ignition internal combustion engine that has a fuel delivery system with a carburetor with a fuel chamber of constant level or constant pressure gradient or pressure head includes, characterized by: 2.) a Vent 11 (20) with a valve inlet (67), a valve outlet let (64) and a valve channel (61); l) one a free space (18) within the fuel chamber (12 209 8 3 77 07-2.1- with the valve channel (6l) connecting first line (52); c) one connecting the valve inlet (67) to a vent second line;
i
jd) a valve outlet (64) with an evacuation device j- connecting third line; and e) a control device (23, 27) for the valve (20), which acts that with normal running of the engine the valve inlet (67) with the valve channel (6l) and after switching off the Ignition, the engine continues rotating, the valve channel (61) is connected to the valve outlet (64). 3. Internal combustion engine according to claim 2, characterized in that the first line (52) has an evaporation loss container (51) having. 4. Internal combustion engine according to claim 2, characterized in that the second line (22) has an evaporation loss container (22a). 5. Internal combustion engine according to one of claims 2, 3 or 4, characterized by a control device with an electrical j solenoids (23) and associated circuit, which switch off the valve (20) after the engine is running when it is switched off a first position connecting the valve inlet (67) to the valve channel (61) into a valve channel (6l) to the valve outlet (64) brings about a connecting second position. J 6. Internal combustion engine according to claim 5, characterized in that that the circuit has a switch (33) for the lubricant pressure of the engine comprises the electromagnet when the lubricant pressure of the engine drops below a predetermined value (23) energized to switch the valve (20) from the second to the first position. 7. Internal combustion engine according to one of claims 2 to 6, characterized in that the evacuation device from the Carburetor or an intake pipe to the engine. 8. Valve for a fuel supply system of an internal combustion engine with a constant level fuel chamber carburetor or constant pressure gradient or pressure head, characterized by a) a valve body (8) having an inlet (67), an outlet (64) and forms a channel (86);
fc) one arranged between the inlet (67) and the channel (86) first valve seat (63);
! c) one between the channel. (86) and the outlet (6 * 0 arranged second valve seat (28); d) a valve stem carrying two valve parts (26, 62) in such a way that when a valve part is seated on the first valve seat (63) (62) the channel (86) and the outlet (64) and when the other valve part (26) is seated on the second valve seat (28) the inlet (67) and the channel (86) are in communication with one another; 209837/0721 e) a spring (27) which biases the valve stem into a position, in which the other valve part (26) rests on the second valve seat (28); and f) a control device (23), which overcomes the pretensioning effect of the spring (27) and a seating of the valve part (62) causes on the first valve seat. 209837/0721 Blank page