DE1526543C - Device in a fuel supply line to the internal combustion engine - Google Patents

Description

1 2

The invention relates to a device in a mene negative pressure above a certain value Fuel supply line to the internal combustion engine, which is located, the further air pressure one above one

based on the machine speed in the suction line behind a main determined value.

Throttle organ responds to the prevailing pressure by speaking.

they with increasing negative pressure during the 5 The invention is hereinafter referred to

Overrun operation, the fuel supply to the intake explained on the drawing by way of example

line at least partially turns off and on the one F i g. 1 shows, partly in a vertical section

further, also dependent on the machine operation and partly in side view, one according to a

Air pressure works, especially for automobiles. trained first embodiment of the invention

As is well known, the shutdown (or reduction) provides a feed device when the engine is idling

tion) the fuel supply to an engine at the appropriate position;

Overrun mode has the advantage that, on the one hand, fuel F i g. 2 and 3 show the same part of the feeder section and, on the other hand, the formation of toxic devices such as Fig. 1 in the normal operation Prevents gases at the exhaust and thereby slowing down or slowing down the engine pollution of the atmosphere is reduced. 15 position;

It is also known that when the main throttle F i g. 4 shows in the same representation as FIG. 1

organ is kept closed, the change of a according to a second embodiment of the invention

Negative pressure behind the main throttle element between manure-trained feed device in the idle

the push mode on the one hand and the actual position;

Idle on the other hand is too low to be an effective 30 Fi g. 5 and 6 show in a partially sectioned view To allow a distinction between the two operating states. Side view according to a third embodiment, on the other hand this change is relatively considerable - the feed device designed according to the invention, borrowed between the opening state of the main throttle which of the FIG. 1 to 3 is similar, but one organs (normal operation) and the closing additional mechanism in the empty state same (push mode and idle). It runs or corresponds to the normal operation of the engine therefore, logically, not just the negative pressure in the corresponding positions;

To take advantage of the inlet channel, which allows, with F i g. 7 and 8 show in a vertical section

Safety to determine whether the throttle body is open according to a fourth embodiment of the invention

or is closed, but also the speed of the manure trained feed device in the

Engine to also determine whether Mo- 30 idling or slowing down the engine

gate with closed throttle in push mode speaking positions;

or idle. F i g. 9 shows in a partially sectioned side

Apparatuses are therefore known per se which consider one according to a fifth embodiment

the vacuum in the intake manifold and the engine speed of the invention formed feed device in the

at the same time use them as control variables. The German 35 digit corresponding to the slowing down of the engine

Patent Specification 582 479 shows a device that ment;

by the position of the accelerator pedal and the speed F i g. 10 shows, partly in a vertical section

the alternator is affected. However, it works and partly in side view, one according to a

formed with an additional throttle valve in the main channel sixth embodiment of the invention

and does not use the vacuum in the intake line 40 when the engine is idling

immediately, but only by way of the corresponding position;

Position of the accelerator pedal and an electrical switch- Fig. 11 shows a detail of Fig. 10 in the

tion, as a manipulated variable. From the USA patent, a deceleration period of the motor corresponds to

2 659 352 a device is known that the corresponding position;

Negative pressure in the intake manifold and the engine speed 45 FIG. 12 shows in the same representation as FIG. 10

exploits. However, it also works with a one according to a seventh embodiment of FIG

Auxiliary throttle valve and uses a ratio- trained feed device in the invention

moderately complicated relay for registering the idle position;

Engine speed. F i g. 13 and 14 show in a partially cut

The USA ^ patent 2 943 849 shows a front side view of an eighth embodiment

direction in which the main fuel line in a variant of the invention designed feed device

dependence on the position of the throttle valve with device in the position of normal operation or in

Is closed with the help of an air pump. The air - the idle position;

However, the pump does not generate any of the speed of rotation of FIG

Motor-dependent negative pressure. Those from the U.S.- 55 Fig. 14;

The device known from patent 2,970,586 operates in FIG. 16 shows a according to a ninth embodiment

also with an auxiliary throttle valve. Approximate form of the invention trained carburetor;

It is the object of the invention to provide a feed pre- F i g. 17 shows an embodiment modification of a

To provide direction for internal combustion engines, the detail of FIG. 16;

In addition to the negative pressure in the intake pipe, the speed is 60 Fi g. 18 shows an advantageous embodiment of the of the motor is used as a control variable, and which strengthens a feed device according to the invention and has a reliable structure. the air pump.

This is achieved according to the invention by a device The following application of the invention is achieved, which is characterized by the fact that the white is a feed device for combustion engines Air pressure is only ren with the engine speed 65, at which the fuel by suction changes and that the at least partial shutdown by at least one calibrated opening with konder Fuel is supplied when metered in the sliding or variable cross-section time in which the one in the suction line is removed.

3 4

The carburetor is on the whole with the exception of the seat formed by the end 21 of the channel 17

Means for changing the fuel supply can cooperate. The chamber 18 stands with

during the deceleration periods of the engine the outside space through a duct 22 in connection

formed in any suitable manner. dung, and a spring 23 seeks the membrane 19 constantly

In the embodiment shown in Fig. 1, 5 dig is to be pulled away from the end 21 of the channel 17,

schematically a downdraft carburetor of the usual design Finally, the other side of the membrane delimits

shown, of which partly in section, only the 19 a closed chamber 24, which by a

for understanding the invention necessary parts line 25 with a driven by the motor

are indicated, namely the main inlet channel 1 is connected to the air pump,

its throttle member 2, which on a shaft 3 io. In the embodiment of FIG. 1 to 3 is the

sits, which is a not shown by the Fah air pump designed so that it has an overpressure

rer operated lever carries. Furthermore, the channel 4 to the chamber 24 is generated. This air pump can

Feeding the idle shown, which is designed as usual like the usual fuel feed pumps

be in the channel 1 behind the throttle member 2 through one, d. that is, it includes a deformable membrane 26

opening 15 (FIG. 1), generally controlled by a screw 6, on which a spring 27

tion 5 opens. acts and which with a semi-inevitable

The devices for controlling the fuel binding are provided with a shoulder

supply are z. B. by a rod 28 connected to a groove 8 with the end 29 of one on an axis 31

seen sliding pin 7 is formed, which is connected to the pivotable lever 30. This lever

Channel 4 can seal. This pin 7 is so ao 30 acts with one driven by the motor

formed that when it is shifted to the left cam 32 together.

up to the position of FIG. 1 and 2 the groove 8 in the die closed by the top of the membrane 26

Channel 4 falls and thus the fuel pass through NEN chamber 36 is through with the outside space

leaves, while when it is shifted to the right up to an opening 33 provided with a suction valve 34 in

in the position of FIG. 3, the groove 8 in the cylinder as connection. There is also a pressure valve35.

withdraws, in which the pin 7 slides, so that which the connection between the upper

this closes the channel 4. A spring 9 seeks chamber 36 and the line 25 determines

the pin 7 constantly to the right side of the Finally there is an opening into the open air

Fig. 1 to 3 bring. The right end of the Zap- calibrated opening37 between the pressure valve35

fens 7 is located in a chamber 10, which is in front of 30 and chamber 24.

preferably, is under atmospheric pressure and ■ The mode of operation of the embodiment of FIG

whose one movable wall is deformed by a 3 is the following:

bar part is formed, z. B. a diaphragm 11, during idling, i. i.e. if the engine is with

which is a movable arrangement with a finger almost closed throttle body 2 and thus with

12 carries, which with the end of the pin 7 in 35 a rather considerable negative pressure behind

Come into contact and this at the same time runs slowly with the same, the pin 7 has the in

Adjustment of the membrane 11 can be adjusted. A position indicated in Fig. 1, i.e., he leaves the

Spring 13 searches the membrane constantly for the left the channel 4 supplied fuel to feed the

Page of FIGS. 1 to 3 to move. Pedal freely through the motor. This is due to the fact that

The membrane 11 also forms the movable wall 40, the chamber 14 is under atmospheric pressure, so

a second chamber 14, which with the inlet that the spring 13 entrains the membrane 11

Channel 1 behind the throttle member 2 adjusted by a suitable pin 7 to the left of the figure

moderately provided with a calibrated opening 16 or holds in this position. The calibrated

Channel 15 is in communication. Opening 37 dimensioned so that that of the air pump

The devices 7, 8 are designed so that they developed pressure due to the low speed of 45 not only on the motor transmitted through the channel 15 and thus due to the low frequency of the Respond to negative pressure, but also to a pump change strokes in line 25 and in the Kam air pressure, which with the speed of the motor mer 24 can not generate any pressure that changes and expediently driven by one of the motor enough to resist the action of the spring 23 Air pump is generated. 50 put and the closure of the seat 21 by the

As shown, the effect of the speed of the valve 20 is to be effected.

Engine-dependent air pressure preferably to a level. Under these conditions, the parts in System of variable volume, which, according to Fig. 1 shown positions, so that air is passed through whether the speed of the engine is smaller or larger than the channel 22 and the seat 21 in the chamber 14 a 55 slightly above the idle speed can occur, which means that it is below the atmospheric value is, either the chamber 14 on which the pressure is

Negative pressure is transmitted, with the outside space in The idling of the engine works like a normal one

Connection sets up this negative pressure in the chamber - idle in the absence of a special device,

to be canceled or weakened (Fig. 1), or if the engine is heavily loaded and proportionally

this connection is canceled to the negative pressure in the 60 runs moderately fast, as z. B. while driving

To bring chamber 14 to act (Fig. 2 is the case, the conditions shown in Fig. 2 are

and 3). conditions. The throttle element 2 is fully or partially

As shown in Fig. 1 to 3, this can be open. The negative pressure in the channel 1 has Chamber 14 through a channel 17 with a third an intermediate value between the idle chamber 18 connected, which 65 seeing value and a negative pressure zero, the air as well is provided with a deformable wall, but the pump can work and quite quickly which is formed by a membrane 19, which holds in the line 25 a non-negligible in their middle a valve 20 carries, which upright with a pressure. Since the discharge opening 37

5 6

is dimensioned accordingly, that of the air pump 19 are then reversed. The working stroke of the pressure developed extremely small when the motor and bran 26 is as shown in FIG. 1 to 3 by a spring thus the cam 32 run slowly, but it takes 27 a generated, which leads to the pull rod 28 of the a certain value as soon as the cam is faster Fi g. 1 to 3 to be replaced by a plunger 28 a The opening 37 can, for. B. be dimensioned so 5 which the end 29a of the lever 30 acts, wherein that above a speed of the motor of the formation of the cam 32 a corresponding to ver-1500 U / min changes the pressure generated by the air pump is the negative pressure generated by the pump sufficient to the membrane 19 to the left increases with the speed of the engine, and one The opening 37a, which is to be calibrated against the action of the spring 23 in the figure, is located on the suction slide and thereby the air connection between the io side instead of the one located on the conveying side to close the chamber 14 and the chamber 18, calibrated opening 37. It is the membrane again by pressing the valve 20 on its seat 21. 19, the chamber 18 and the opening 22 for connection. This position is shown in FIG. 2 with the outside space; that at the

However, since the prevailing in the channel 1 sub-membrane 19 fixed valve 20 a, however, has the pressure is not significant, the spring 13 is so calibrated, 15 reverse design, and its seat 21 α is on that it opposes the effect of the negative pressure on the other side of the chambers 14 and 18 verMembran 11 and thus the movable binding channel 17 a.

Adjust the arrangement to the left of the figure. Finally, the is located on the membrane 19

leaves, so that the Leeiiaufkanal 4 is not closed pressing spring 23 a in the chamber 24. You should

and can provide fuel. ao also open the air passage by opening the

Fig. 3 shows the case of a slowdown, i.e. valve 20 a lifts from its seat 21 α when the

the conditions under which the vehicle's engine speed is low. The opening, about

Motor drives. It is well known that under these conditions, which the pump delivers into the open air, is loaded with 33a

the throttle member 2 closed, and draws

The negative pressure in the channel 1 is considerable, namely »5 The mode of operation of the embodiment of FIGS. 4 is often even somewhat larger than that in idle mode, that is, that of the embodiment of FIG. 1 to 3, seeing. d. i.e., the pump draws air through the calibrated

On the other hand, the cam 32 has such a rotary opening 37a and conveys it through the opening

number that the air pressure generated in the line 25 33 a, whereby in the chamber 36 and the chamber 24

as in Fig. 2 is sufficient to change the air passage through 30 with the speed of the engine

to close the seat 21 by means of the valve 20. Is generated in negative pressure. When this speed is high

in this case that is formed in the inlet channel 1, the negative pressure actuates the diaphragm 19 in such a way that

prevailing negative pressure in the chamber 14, and that it is through the membrane and the valve 20 a

the spring 13 is calculated and adjusted in such a way that the arrangement formed is on the right-hand side of the figure

under these conditions, this negative pressure shifts, the passage of air through the open

is sufficient to close the membrane 11 with the entrainment of the nung21a, so that the chamber 14

Pin 7 on the right-hand side of the figure only communicates with the inlet channel 1,

slide, creating the full section of the spigot when under these conditions the negative pressure

comes into channel 4 and closes it so that it is high in this channel, the mem-

cHe fuel delivery through the opening 5 interrupted 40 bran 11 with entrainment of the pin 7 according to the

..len will. right side of the figure, and if the negative pressure

If the speed of the motor z. B. under ISOO U / has a weak or medium value, is the

min falls, that of the air pump in the Lei spring 13 predominates and shifts the diaphragm

device 25 and the chamber 24 developed air pressure 11 to the left of the figure, so that a normal

so that the valve 20 opens again and air 45 ler passage of the fuel through the idle

channel through the opening 22 and the seat 21 into the chamber is possible (position shown).

14 can occur At this point, there is a disadvantage of the devices according to FIG

Opening 16 is calibrated, which prevails in the chamber 14 to 3 and 4 is that the air pump at

Seeing negative pressure is no longer sufficient to keep up with any engine operating conditions

Membrane 11 on the right side of the figure must work against it. It is therefore either an anomalous one

to keep the action of the spring 13, and the parts heating up the pump by compressing the

again take the position of FIG. 1, so that air or premature wear of the membrane 26

the engine can idle normally once to fear which is constantly working, even if

the speed falls below a predetermined value. the pressure in the pump is useless

On the pin 7, a possible potash is shown in dashed lines. In order to avoid this disadvantage, the in Briert opening 38 is shown, which can be used in engines Fig. B. the device of Slowing down expediently the fuel supply for devices similar to FIGS. 1 to 3 the opening37 the idle is not completely interrupted, but is controlled by a valve 39, which is on a . is only decreased. This calibrated opening 38- 60 membrane 40 is attached, the valve 39 of which allows the facing side created by the groove 8 (FIG. 1) via an opening 41 to be under the atmospheric pressure through a calibrated passage while the other side one replace, which closes the difficulties encountered chamber 42, which is replaced by a. Line 43 eliminated (Fig. 3). connected to the inlet channel behind the throttle element 2

F i g. Figure 4 shows a similar arrangement in which 85 is tied, e.g. B. connected to channel 15

however the air pump is a negative pressure rather than a sen. A spring 44 searches for the opening 37 through dat

The suction valve 34 and the valve 39 counter to the effect of this negative pressure: To close pressure valve 35 and the movements of the membrane. The spring 44 is balanced so that £

the valve 39 only releases the opening 37 when the annular space between it and one surrounding it through the line 43 transmitted negative pressure somewhat calibrated opening 56 regulates. The fuel supply is smaller than that of idle. takes place through a channel 57 from a not shown

All other parts of the embodiment of the provided float tank, which with the outer Fi g. 5 and 6 are identical to those of FIG. 1 to 3 iden- 5 air or the air inlet of the gasification is connected. table and therefore partly neither shown nor in the. The air and the fuel are then under the individually described. the same pressure difference, namely the difference

Under these conditions the arrangement operates between that in the air inlet of the carburetor with the opening 37 released, as in FIG. 1 to 3 for the prevailing pressure and that in chamber 48 all conditions of idling and demand- io prevailing pressure, and it is enough that the through (F i g. S), the negative pressures in the body 46 (air) and the needle 55 (fuel) Inlet channel 1 is higher when slowing down than when the flow cross-sections are practically proportional to idle. are tional to the mixture supplied to the engine

In all other cases, however, i. i.e. when giving a constant salary. Negative pressure in the channel 1 is less than that determined by the 15 At such carburettors a device is brought to the setting of the valve 39, that of the one shown in * Fig.-1 to 3 is brought opening 37 closed by this valve (FIG. 6). corresponds and, if necessary, according to FIG. 5 and 6 At this moment the pumped air cannot be completed. Such an arrangement includes more emerge, so that in the chamber 36, in particular the diaphragm 11 and its spring 13, a constant pressure is established, which the spring 27 closes, as do the chambers 18 and 24, which are shown in FIG. 7 and 8 together and therefore the membrane 26 is not shown in its section, since it is opposite holds the lowest position. The lever 30 then actuates Fig. 1 unchanged. Furthermore, the air from the pump is no longer the pump, and the line 25 coming in an unalterable pump is also present, as is the borrowed position blocked membrane 26 does not tire with the inlet line denoted here by 45 of the more, which at the same time avoids heating and a lei wear associated with the engine behind the throttle element 2. . tion 15.

However, as soon as the closure of the throttle- In contrast to the previous execution

organs 2 the negative pressure forms a higher value again, the fuel is not supplied when idling than that of the balancing of the spring 44 corresponding by a special line, but by the assumes, the membrane 40 is guided upwards, 30 annular passage between the calibrated whereby the opening 37 (FIG. 5) is released, opening 56 and the needle 55. and the pump again as in FIG. 1 to 3 is working The facilities described above are on

One of the device of FIGS. 5 and 6 corresponds to such a carburetor adapted in that the The corresponding device which actuates the opening 37 can point to fingers 12 attached to the membrane 11 can also be realized for an air pump, which 35 needle valve 67 against the action of a spring 58 with negative pressure (Fig.4) instead of pressure (Fig. 1. This needle valve to 3) works. can close an opening 59, which is connected to the

In Fig. 7 and 8, a carburetor is shown, which is connected to a channel 45 downstream of the throttle element 2 Rather understood from the usual carburetor with a fixed nozzle. The opening 59 forms the starting point of a is divorced. It is a carburetor with 40 ducts 60, which is provided with an air cross-section that can be changed into the chamber 53 and with a fuel cross-section that is calibrated cut. The operation of such carburetors, which The operation of the device of FIG. 7 and 8

essentially formed by a main channel 45 is the following:

be, which is operated by means of a shaft 3. In actual idling, the parts take the in

actuated throttle member 2 is provided, is known 45 Fi g. 7 position shown. As is well known, is located

An automatic device pressure regulating the air passage cross section as a function of the chamber 14 (see FIG. 1) under the atmospheric flow rate. The force of the spring 13 is then propagated z. B. formed by a body 46 which, in order to move the needle valve 67 towards the opening 59 rather by a spring 47 press into the interior of the channel 45 and thereby any connection between the introduced and in the opposite direction through 50 conduit 45 and chamber 53 to prevent. the the negative pressure is shifted, which in the mid-engine is then with the idle fuel under see the body 46 and the throttle element 2 Hegen- the same conditions prevail as in the absence of the inventive chamber 48, namely fed by means of a device according to the invention. nung49, soft this negative pressure to a deform- In the deceleration period, on the other hand, causes bar or movable organ transmits, for example a 35 as shown in Fig. 8, the strong one in the inlet membrane 50. In Fig. 7 and 8, the membrane separates line 45 behind the throttle element 2 prevailing 50 two chambers, of which the lower chamber 51 negative pressure simultaneously with the strong through the with the general air inlet through an orifice line 25 pressure transmitted that the chamber 14 52 is connected, while the upper chamber S3 is only in communication with the inlet line 45, is closed by a cover 54. βο As is well known, the spring is under these conditions

It is known that under these conditions at 13 o, the diaphragm 11 remains calculated on the figure any amount of air flow pulls the body 46 upward, thereby releasing the needle valve 67 stand in a position in which the action of the inlifted and the opening 59 is opened. Negative pressure of the chamber 48 on the diaphragm 50 At this moment, part of the tension in the spring 47 is unfortunately kept in equilibrium. 65 tion 45 behind the throttle body 2 prevailing

The amount of fuel is transferred to the chamber 53 through a needle 55 under negative pressure. The corresponding profile regulated, which with the body ratio between the cross-sections of the openings is shift by 46 and the cross-section of 61 and 49 has the consequence that in the chamber 53

9 10

a higher negative pressure than in the chamber 48 is replaced by 7 α, which is designed so that at forms, whereby the body 46 is raised. This his shift to the right up to the position The stroke movement causes the groove 8 to fall into the channel 4 as a result of the increase in the tension in FIGS the spring 47 is limited. This has the consequence that the and thus the fuel lets through while they are at The value of the negative pressure in the chamber 48 decreases, 5 its shift to the left into the since under the deceleration conditions the throttle position of FIG. 11 recedes into the cylinder, in selorgan 2 is closed and the upward movement which the pin 7 slides, which then the of the body 46 closes the connection cross-section with the channel 4. Λ

Air under atmospheric pressure. According to the embodiment of FIGS. 10 and 11

increases. io the pin la is changeable by a system

If the actuated in the chamber 48 and thus practically volume, which contains a membrane 71, at the opening 56 prevailing negative pressure sufficient on which a spring 69 acts, which the pin 7 α becomes small, the fuel delivery decreases, or steadily after on the right-hand side of FIGS. 10 and 11 it can even stop completely, since the burn is trying to move. The membrane 71 closes a substance which has the tendency, in the absence of a negative pressure 15, chamber 70 which communicates via a channel 72 with the inlet channel 1 determined by the constant level N. This channel 72 levels fall behind. It can be seen that when it opens via an opening 73 which realizes the deceleration conditions, that is, it moves from the downstream side of the throttle element 2 to the upstream and high speed of the engine at high negative pressure behind the throttle element 2 The fuel depth goes over if this can be reduced by a few degrees through the opening 56 or even if it can be permanently canceled from the idling shown in FIG. As soon as the rotary position is opened.

number of the engine below a predetermined value. B. 1500 rpm) falls, the membrane 19 forms the movable wall of the chamber 70 forms on the Air passage through the seat 21 is free, the membrane 11 »5 on the other side the movable wall of another goes down, the needle valve 67 closes the opening chamber 74, which through a channel 75 with a 59, and the body 46 again takes the air pump in FIG. 7, which is connected to the one in FIG. 1 position shown, whereby the fuel depth shown is identical. The one that opens out into the open tion for idling instantly restored calibrated orifice 37 is between the pressure being. 30 valve 35 and the chamber 74.

The operation would of course be the same if the operation of the embodiment of Figs

the body 46 equals any other 11 is the following:

valuable throttle member would be replaced, z. B. an eccentric From the above it can be seen that

tric flap. thanks to the calibrated opening 37 in the channel

In Fig. 9 is one of the devices of FIG. 7 35 75 and thus in the chamber 74 an air pressure from and 8 corresponding device is shown, in which forms, which with the speed of the cam 32 but the zucher takes through the space between the fixed, ie with the speed of the calibrated by the opening 56 α and the needle 55 a metered set device powered motor. The resulting fuel in the line 45 is not due to the air pressure developed in the chamber 74 and is sucked into the membrane stream, but into a pump 62 and "o bran 71 against the action of the spring 69 after which from there via a distributor 63α into an im To move the general left side of FIGS. 10 and 11, those arranged behind the throttle element 2 mean that the channel 4 is closed. This spring 69 spray nozzle 63 is sent. This fuel is dimensioned in such a way that the membrane 71 only reaches a chamber 64, which can be displaced to the left through FIGS : the same negative pressure is brought as it is in the

Chamber 48 prevails. ^a ) The chamber 70 must be under a vacuum The mode of operation of the embodiment of FIG. 9 is related to that in the inlet channel 1

is exactly the same as that of Figs. 7 and 8, since ter corresponds to the throttle member 2 prevailing,

the fuel flowing through the opening 56 a so when the engine is idling; under the effect of the prevailing in chamber 64 - _{b) the} chamber 74 must be under a pressure, the negative pressure, ie practically under the effect of which corresponds to a speed of the motor,

the prevailing negative pressure in the chamber 48, which is at least equal to a certain

is delivered. It follows that there is a low limit, e.g. E.g. 1200 or 1500 rpm.

Lifting the body 46 a at least when the 35

nem throttle member 2 a cessation of the fuel. You can see that every time the throttle delivery causes through the opening 56 a. This case organ 2 is closed and the engine with more than is shown in Fig. 9 (engine deceleration). 1200 or 1500 rpm is running (slowing down period - In idle, the body 46 a takes the dash pounds), the passage of the idle fuel through The needle valve 67 closes the opening to the opening 5 at least to the opening 59, whereby a larger negative pressure is closed (FIG. 11). is produced in the chamber 48, so that the combustion If, on the other hand, the speed of the engine is smaller

substance can be supplied for idling. than the above limit is that by the pump

In FIGS. 1 to 6 and in FIGS. 13 to 15, a 26-37 is created in the channel 75 and the chamber 74 Pin 7 is shown, which is designed so that 65 pressure is insufficient to überiner the spring 69 when »a shift to the right side of the, and the pin 7 a goes to the right into the Figures closes the feed channel of the idle. 10 to 12 Ut of the pin 7 through a pin for the idle fuel via the groove 8 again.

I 526 543

11 12

will be produced. Furthermore, changes at any speed. The pin la is therefore supported by the spring 69

of the engine when the throttle member 2 itself is only partially pressed to the right of the figure, so that

wise opened, the opening 73 from the flow of the fuel passage through the idle passage 4

downward side of the throttle member 2 is left free.

upstream lying over, so that the in the chamber 5 To the closure of the channel 4 by the

mer70 generated negative pressure is very small, whereby displacement of the pin la to the left is obtained,

the action of the spring 69 becomes predominant. The following conditions must therefore be met at:

Under these conditions, the fuel delivery is through _{a) The air pump must} develop a pressure,

the idle channel 4 normal _ the _{higher ώ the emer speed} i of _the engine

Whereas in the embodiment of FIG. 10 there is a _{corresponding limit of 12QQ} ^ _150Q rpm.

and 11 the two functional pressures (negative pressure _value j _st . ' ^r

in the inlet duct 1 and through the air pump ..,. "J _, _D. , ..,

generated pressure) both act on the membrane 71, ^b ) J ^{e opening} ST, ³ ™ ^β downstream of the

acts in the embodiment of FIG. 12 only the second throttle element 2, so that the negative pressure

these functional pressures in the system change 15 m the chamber 79 is sufficient to open the suction port

such volume with the membrane 71, while ^{M to} expose.

the first of these functional pressures in a two- when these two conditions are not simultaneous th system of variable volume is effective, are met, d. i.e. if the engine is not in a which cooperates with the first so that it is in the deceleration period, the idle remains this the effect of the first pressure regulates ao channel 4 fully open.

The embodiment of FIG. 12 differs from the modification of the air pump according to FIG. 12

of the preceding in that the chamber 70 offers the following interest:

If the suction opening 33 is set by the valve 77 and because the suction opening 33 is closed, the air cannot enter the chamber 36 instead of flowing directly into the open, enter through a »5 of the pump. The few conveying movement valve 77 is controlled, which is controlled by a diaphragm, which by the inevitable effect of the 78 is carried, which closes a chamber 79, cam 32 a can be generated, drive a which is connected to a channel 72, which part of the air remaining in the chamber 36 via the with that of FIG. 10 is identical. The valve 77, pressure valve 35 and the opening 37 so that which seeks to close a spring 80, inside the chamber 36 of the pump there is a negative pressure within a chamber which is connected to the outside space, which counteracts the action of the spring 27 a The membrane 26 is raised through an opening 81 of large cross-section in Ver and is in the upper position commitment. holds the figure immobile. The lever 30 becomes free

Finally, the air pump, which is movable with a, and the cam 32 a has no effect A pressure above atmospheric pressure works more on the membrane 26. As a result, will Tet, like that of FIG. 10, with respect to this modified in this way, the membrane 26 of the pump is blocked every time changes that the delivery stroke of the membrane 26 is at least partially opened by the throttle member 2, Cam rather than a spring. d. H. during the operating periods of the vehicle, in For this a cam 32 a is used, which which channel 4 must not be closed, The end 29 a of the lever 30 lifts, with a plunger 28 a 40 which prevents the premature wear of the membrane between this end and the membrane 26 and which is required for its normal drive. A spring 27 a seeks the plunger 28 a with borrowed low energy consumption in omission, to keep the lever 30 in contact. The embodiment of FIGS. 13 and 14 differs

The mode of operation of the embodiment of FIG. 12 essentially differs from that of FIG. 12 in that

says that of the embodiment of FIGS. 10 and 11, each 45 that the air pump with negative pressure and not with

but with the difference that the spring 69 simply works overpressure. The pump is then as in FIG. 10

is adjusted so that the pin 7a is formed after the lin-, d. H. the cam 32 acts inevitably

ken page of Fig. 12 goes as soon as that of the air- in the sense of the suction of the air, while a spring

pump developed and transmitted through channel 75 in a different sense. Besides, the channel is

gene pressure reaches a value which a rotary 50 75 connected to the suction side of the pump, whereby

number of the motor in the order of 1200 up to a calibrated opening opening into the open air 37 a

Corresponds to 1500 rpm. The spring 80 is so separated between the suction valve 34 and the membrane

like that the membrane 78 in Fig. 12 is arranged upward bran 71 α limited chamber 74α.

goes when the in the inlet channel 1 behind the The delivery opening 82, which is downstream of

The negative pressure prevailing at the throttle element 2, which is approximately 55 to the pressure valve 35, is controlled by the valve 77

controlled according to the idling conditions of the engine carried by the diaphragm 78

reached the value. From this it follows that as soon as it becomes clear which chamber connected to the channel 72

the throttle element 2 itself is partially open and the mer 79 closes.

Opening 73 from the downstream side of the- A spring 69 a seeks the pin 7 against the

same goes over to the upstream, the fa effect of the prevailing in the chamber 74 a

The negative pressure prevailing in the chamber 79 cannot be opened with negative pressure.

extends around the membrane 78 against the effect. The mode of operation of the embodiment of FIGS. 13 and

to keep the spring 80 above. Since the spring predominates, it is as follows:

can see, the valve 77 is placed on the opening of the developed by the pump in the channel 75

33 and thus prevents the air pump from working. In «5 the negative pressure changes with the frequency of the

at this moment the relative pressure of the self-movement of the lever 30, i.e. H. with speed

the pump in the channel 75 delivered air zero, the motor. If the valve 77 is raised, what

and a displacement of the diaphragm 26 is prevented. A position of the throttle member 2 corresponds to that which corresponds to

13 14

is very close to the idle position, the channel 4 operates during the slowdown periods

Pump normal. It sucks in air through the calibrated engine's closed.

opening 37 a and conveys it through the openings. It should be noted that in the case of the embodiment 82 and 81. Since the on the chamber 74a through the Fig. IS the current in the electromagnet 86 Channel 75 transmitted negative pressure with the rotary 5 only during the slowdown periods of the engine the number of the motor changes, the cross-section that flows, i.e. H. during the relatively short operating opening 37a and the balancing of the spring 69a so periods of the engine, while the general is set, that when the speed of the motor a gate supplies a large current, so that the current is determined Exceeds limit value, the membrane 71 α consumption by this device is not a disadvantage against the action of the spring 69 a according to the law io forms

th side of Figs. 4 and 5 and the pin 7 is the The embodiment of Fig. 15 offers the advantage Channel 4 closes. that the system containing the membrane 71a changes on the other hand, the throttle element 2 instructs at least partial volume on the air pump itself is open, as in Fig. 13, the chamber 79 can be brought so that the essential parts under a pressure which is considerably greater than that of the device combined at the pump Idle is appropriate, and the spring 80 can. The only ones with the feeder the valve 77 presses the delivery opening 82. The connections to be made are those of the motor the pump continues to suck in through the opening 37 a, pipe 72 and the one that feeds the electromagnet 86 but can no longer convey through the opening 82, circuit. This construction thus offers the pre-emergence in the chamber 36 a pressure which the ao part that it is easily adapted to all motor vehicles Diaphragm 26 blocked in the lower position, so can be.

that the atmospheric pressure in the channel 75. In Fig. 16 is a carburetor with variable

and the chamber 74 a sets. At this moment the air and fuel cross-sections are shown, which one

the spring 69a becomes predominant and displaces that of FIGS. 7 and 8 corresponds.

Pin 7 to the left (as shown in Fig. 13), so as With such a carburetor according to the

that the passage for the idle fuel freige- embodiment of Fig. 16 a device com-

will let. Here, too, must be combined for production, which of the already shown in Fig. 13 and 14

the closure of channel 4 corresponds to the following conditions,

must be fulfilled: This device contains in particular the mem-

a) The throttle device 2 must be closed; 30 bran 71α and its spring 69 α, the negative pressure

b) the speed of the cam 32 and thus the working air pump and the channels 72 and 75. Motors must exceed certain limits. A needle valve 67 a is attached to the membrane 71 α. th. stigt, which can close an opening 59, which

Furthermore, it is in all operating states "!" In which with the inlet channel 45 behind the throttle element 2 the channel 4 is kept open, the membrane 26 communicates with 35 and the origin of a channel the air pump blocks, which forms its wear and tear, which minringes into the chamber 53 with one and the calibrated opening 61 is provided with the end corresponding to its drive energy consumption is eliminated. 14 shows the adjusting spring 69a is constantly looking for the needle valve 67a development of the parts when the engine is idling. opening 59 to close it

In Fig. 15 is an embodiment modification of 40 and the connection between the inlet channel 45 .jsführung shown in FIGS. 13 and 14 is shown to be interrupted at and the chamber 53,
which the system provided with the membrane 71a The embodiment of FIG.

fen 7 is actuated, but via a plunger 83 a.

movable contact 84, which is driven by the vehicle with a fixed 45 surface, Contact 85 cooperates. These two contacts, the throttle member 2 is closed, or it takes are in the circuit of an electromagnet 86 at least the position of the idle, and the switched, whose core 87 with the pin 7, wel- speed of the engine is above a between 1200 rather like that of FIGS. 13 and 14, a limit value lying at 1500 rpm The valve 77 Piece forms. A spring 88 drives this pin so it is raised for the reasons explained above, constantly on the token side of the figure. and is the drive speed of the air pump

The circuit of the electromagnet 86 is so large that the transmitted through the channel 75 generally with the ignition circuit A of the engine grain negative pressure bin the membrane 71a against the action, so that a common switch / allows the spring 69 α and therefore lifts the opening 59 is released by possibly the current at the same time in the ignition 35 lifting of the needle valve 67 a As already stated circle and the circle of the electromagnet 86 with reference to FIGS. 7 and 8, a battery B is to be produced. thereby the body 46 is raised somewhat, and the

The mode of operation of the embodiment of FIG. 15 is prevailing in the chamber 48 and is limited to the annular space by practically the same as that of FIGS. 13 and 14, the needle 55 in the opening 56. If the required conditions are met, the negative pressure acting is reduced as a result 'and in the chamber 74a the production of a lower fuel supply for the idling is printed on, which is so large that the membrane is lifted or at least reduced.
bran 71α against the action of the spring 69 a once the engine speed falls below the above

sucks, the contact 84 touches the contact 85, limit values falls , the negative pressure developed by the pump through the excitation circuit of the electromagnet 86 65 no longer unwinds to close, which opposes the attraction of the pin 7 action of the spring 69 a . On the right-hand side of FIG. 15, this presses the needle valve 67a against the opening 59; and kung of the spring 88 results. As a result, the body 46 can go down again and the

restore normal fuel delivery for idling (position shown in Fig. 16).

If, however, the throttle element 2 is open, the valve 77 closes the opening 82, so that the pump then is out of operation and, in particular, the needle valve 67a allows the opening 59 to be closed.

The embodiment modification of FIG. 17 has the same relationship to the embodiment of FIG. 16 as the embodiment modification of FIG. 15 to the embodiment of FIGS. 13 and 14. The membrane 71a of FIG. 17 acts on one via the contacts 84 and 85 circuit which can energize a solenoid 86 b, the movable core being connected with a needle valve 67 b, which corresponds to that in Fig. 16 with 67a designated.

The operation of the embodiment of FIG. 17 is identical to that of the embodiment of Fig. 16 and its advantages are the same as those of the embodiment 15. It allows in particular the essential parts of the device according to the invention to group on the body of the air pump.

Regardless of the selected design, it is advisable to use the usual gasoline pump and the one according to the invention To summarize air pump such that they are driven by the same mechanism containing the cam 32 or 32 a be able.

Fig. 18 shows the combination of the fuel pump with an air pump of the type shown in Figs. 1, 13 and 14.

The fuel pump is designed in the usual way and has an under the action of a Spring 90 standing membrane 89. The middle part of the membrane is provided with a shoulder 92 Rod 91 connected. With the shoulder of the rod 28 of the air pump and the shoulder 92 of the Rod 91 of the fuel pump, arms 93 and 94 of the pivot lever 30 of the preceding act Embodiments corresponding pivot lever 30 a together.

The fuel economy is essentially through a supply pipe 95, a suction valve 96, a pressure valve 97 and a discharge pipe 98 are formed. The others Parts of the air pump are identical to those of the pump of FIGS. 13 and 14 and are given the same reference numerals as indicated in these figures.

In the pump of FIG. 18, the cam 32 which actuates the lever 30 a simultaneously drives the fuel pump and the air pump as if these two pumps were operated separately and would each have a lever corresponding to the lever 30 a. The advantage of that shown in FIG Pump, however, is that it is not necessary to change the motor in order to use the device according to the invention to be installed, since on the one hand one and the same cam is used and on the other hand the total space requirement this double pump hardly larger than the space required by a conventional fuel pump is. A simple fuel pump can therefore be convenient be replaced by a double pump of the type shown in Fig. 18 to the invention To attach device to existing engines.

Claims (14)

Patent claims: 1. Device in a fuel supply line to the internal combustion engine, which is based on the in the intake line The pressure prevailing behind a main throttle organ responds by increasing the pressure Underpressure during the overrun operation, the fuel supply to the intake line at least partially turns off and on which another air pressure, which is also dependent on the machine operation, acts, characterized in that the further air pressure only changes with the engine speed changes and that the at least partial shutdown of the fuel supply takes place if in the same time in which the in the suction line taken vacuum is above a certain value, the further air pressure corresponds to an engine speed above a certain value. 2. Apparatus according to claim 1, characterized in that the further pressure by a by the motor driven air pump (27-37) is generated. 3. Apparatus according to claim 1 or 2, characterized in that an organ (7 or 67) Change the system that activates the system to shut off or limit the supply of fuel Volume (11,14) one of the two pressures (negative pressure in the suction line and preferably pressure created by the air pump), is brought into action and that on a second system of variable volume (19,24), which interacts with the first (11,14) so that in this it regulates the action of the first pressure, the other of these pressures to act is brought (Fig. 1 to 6). 4. Apparatus according to claim 3, characterized by devices which the of the Speed of the engine depending on the air pressure to a system of variable volume (19, 24,) Bring action, which depends on whether the speed of the motor is less or greater than a value slightly above idle speed is either the variable volume system (11,14), to which the negative pressure prevailing in the suction line (1) is transmitted, with the Connect external space to this negative pressure in the system of variable volume (11, 14) to suspend or weaken, or break this connection in order to this Underpressure fully in this system of variable volume (11, 14) come into effect leave. 5. Apparatus according to claim 2, characterized in that the air pump (27-37) a Pump with a diaphragm (26) which is moving in one direction through a reciprocating Lever (30 or 30 a) and actuated in the direction by a spring (27 or 27 a) will. 6. Apparatus according to claim 2 or 5, characterized by a system (39-43) which the moving part of the air pump, e.g. B. a membrane (26), blocked when the engine is under Load runs, this blocking system preferably on the in the suction line (1) responds to the negative pressure prevailing behind the main throttle element (2) (FIGS. 5 and 6). 7. Apparatus according to claim 1 or 2, characterized in that the on the negative pressure and air pressure responsive means movable or deformable 009 648/92 Organ (71) included, which on the one hand on both sides of the - negative pressure in the inlet channel or the pressure that changes with the speed of the motor and, on the other hand, the effect a spring (69) is exposed in such a way that the force exerted on this member (71) with the Speed of the motor and increases with this negative pressure, the spring (69) is balanced so that that they enable the at least partial shutdown of the fuel delivery at a Slowing down only gives way when at the same time the engine speed is above a given Limit value (z. B. 1200 to 1500 rpm) and the negative pressure is about the value of the negative pressure at idle (Figs. 10 and 11). 8. The device according to claim 3, characterized in that the organ for stopping or limiting the fuel delivery (7 a or 7) actuating system of variable volume (71, 74 or 71 a , 74 a) acts with the variable speed of the engine air pressure and that a second system of variable volume (78,79), on which the air pressure prevailing in the inlet duct (1) acts, cooperates with the first system of variable volume (71, 74 or 71a, 74 a) in such a way that there is the Fig. 12 and 13-14 regulate the effect of the first pressure. 9. Apparatus according to claim 2 and 8, wherein the air pump works with positive pressure, characterized in that the second variable volume system (78, 79) controls the suction valve (34) of the air pump (27-37) so that this valve ( 34) is only open when the negative pressure in the inlet channel reaches approximately the value of the negative pressure at idle, while the first system of variable volume (71,74) cooperates with a spring (69) which is balanced so that it gives way when the air pressure generated by the pump exceeds a value corresponding to a given limit value for the speed of the engine (FIG. 12). 10. The device according to claim 9, characterized in that the movable member (26) of the air pump (27-37) is inevitably actuated during the delivery stroke and by an elastic system 27 a) during the suction stroke. 11. The device according to claim 2 and 8, wherein the air pump works with negative pressure, characterized in that the second variable volume system (78,79) controls the pressure valve (77) of the air pump (27-37) so that this valve ( 77) is only open when the negative pressure in the inlet channel reaches approximately the value of the negative pressure at idle, while the first system of variable volume (71a, 74 a) cooperates with a spring (69 a) which is balanced so that it yields when the negative pressure generated by the pump exceeds a value corresponding to a given limit value of the engine speed (Figs. 13 and 14). 12. The device according to claim 11, characterized in that the movable member (26) of the air pump (27-37) is inevitably actuated during the suction stroke and by an elastic system (27) during the delivery stroke. 13. Apparatus according to claim 1 or 2, characterized in that the devices responsive to the air pressures actuate a switch (84, 85) which is switched into the feed circuit of an electromagnet (86, 86 b) which is the organ for switching off or limiting the amount of fuel (7> 67 b) is actuated when slowing down, these devices preferably being combined to form a group with the air pump (FIGS. 15 and 17). 14. The device according to claim 2, characterized in that the air pump (27-37) with the fuel pump (89-98) of the device is combined so that the movable or deformable organs (membranes 26 and 89) of the two pumps of one and the same pivot lever (30 a) or the like. Be actuated (Fig. 18). For this purpose 3 sheets of drawings