DE2105212A1 - Device for feeding internal combustion engines with fuel - Google Patents

Description

210521

8 Münci. an 2, tirüuhc; uss: r.uiJo 4 / IiI

3644-70

SOCIETE INDUSTRIELLE DE BREVETS ET D ¹ STUDES SοI.BE

Device for supplying internal combustion engines with fuel

Addition to the main application ..... (patent application P 18 02

381 .9 from 10.10.68)

The invention relates to the devices

for supplying combustion engines with fuel, which in their inlet line in front of a main throttle device operated by your driver an auxiliary throttle, which is automatically and opens steadily in accordance with the increase in the air flow in this line, as well as means for injecting liquid Fuel under pressure in the downstream of the main throttle body Section of this line and finally a metering system, which for the position of the auxiliary throttle: organs is sensitive and regulates the amount of fuel injected so that the content of the 3trö- ' Menden air-fuel mixtures at least for certain operating conditions of the engine is practically constant, this

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Injection means are constituted by a source for the supply of fuel under pressure, whose in said Section of the inlet line leading through the PÖrderkreis at least one valve operated by an electromagnet is controlled

The invention particularly relates to

such devices, which according to the German patent application No. P 18 02 381.9 from 10.10.68 are formed, and their dosing system is in a continuous rotary movement has offset member, which by acting on the excitation of the electromagnet, the opening of the valve3 determined on only a fraction of each of its revolutions, this system being designed to do this Fraction according to the increase / of the Hilisdrosüelorgan enlarged, and vice versa.

The invention relates in particular to

if not exclusively, from such devices those in which the constantly rotating member has means, which direct an energy flow to a stationary receiver during a fraction of a revolution, its , Worth in puncturing the mutual position of the rotating Limb and the recipient changes, the recipient so is designed that it controls the excitation circuit of the electromagnet, depending on whether it receives the flow of energy or not, wherein the auxiliary throttle member is designed so that it changes the mutual position of the rotating member and the receiver. The means that send out the flow of energy can be a light source and the receiver a photoselle, a photodiode or a light-sensitive resistor, whereby the energy source and the receiver are arranged on either side of the rotating member, which has an opaque doorway forms a screen containing a penster for illuminating the receiver.

That. rotating member becomes expedient

formed by a flat, opaque disk perpendicular to its axis of rotation, the stationary receiver being designed in this way is that it can be approached or removed from this axis ♦

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The duration of each excitation of the electromagnet is longer, the lower the speed of rotation of the rotating member and the greater the fuel delivery (volume in the unit of time). At low speeds and loads on the internal combustion engine, the amount of fuel required is small. When the rotating member is driven by this motor, the duration of excitation is long enough to make the electromagnet respond properly. If, on the other hand, the rotating member of a ; ■. ' is driven by the internal combustion engine independent auxiliary motor, in particular an electric motor, the speed of which is generally invariable, the duration of each energization of the electromagnet is too short to make the electromagnet "properly respond. ™

The invention aims to remedy this disadvantage.

For this purpose, the feed device according to the invention, the rotating member of which is driven by an auxiliary motor is characterized by means which the rotary '; Change the number of the auxiliary engine in the same direction as the speed of the internal combustion engine.

The means of changing this speed

are preferably for the position of one of the two throttle organs, Main throttle body and auxiliary throttle body, sensitive.

If the auxiliary motor is an electric motor, - '

can the means aüogebil- aur changing its speed; ■ It must be that they change the supply voltage of the electric motor at the same time as the speed of the internal combustion engine.

Because thanks to this training, the speed

of the rotating member decreases at the same time as that of the internal combustion engine _x is for small amounts of fuel, the smallest excitation duration of the electromagnet, the greater the lower the speed of the rotating member, so that an exact response of the electromagnet to its excitation and thus a more accurate metering of the fuel is achieved .

The invention is explained below by way of example with reference to the drawing.

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Pig. 1 shows in a schematic,

partially cut side view of a feed device according to the invention, whose parts are in the normal operating position are located.

Pig. FIG. 2 is a section of the device along line H-II of FIG. 1.

When executing the. erfindungsgeriässen device for fuel off supply of vehicle engines, this is designed as a whole in any suitable manner and contains 1 in its inlet line a main throttle element 2 operated by the driver, an auxiliary throttle element 3, which is automatically and steadily in accordance with the increase in the amount of air flowing in the line 1 opens, the direction of flow of the air being indicated by the arrow F is indicated in Fig. 1, as well as devices for injecting liquid fuel under pressure into the rear of the main throttle element 2 lying section of the line 1, and finally a metering system which is sensitive to the position of the auxiliary throttle element 3 and the amount of fuel injected regulates so that the content of the IiUft fuel mixture flowing in the line 1 at least for certain operating conditions of the engine remains practically constant.

In the illustrated embodiment

the auxiliary throttle member 3 is formed by a flap fastened on a shaft 4. This flap is operated by a pneumatic Device with a two chambers 6 and 7 separating from each other Diaphragm 5 actuated. The chamber 6 is connected by a channel 8 with a chamber 9, which through the between the Main throttle member 2 and the rotary valve 3 lying portion of the line 1 is formed. The axis 4 is fixed to a Lever 10 connected, which is provided at its free end with a pin 11, which with the end of one with the Diaphragm 5 connected rod 12 cooperates. A spring 13 constantly auöht the rotary flap 3 against the action of the the chamber 6 transmitted negative pressure to close. The chamber 7 is preferably from the air inlet 15 of the line 1 outgoing channel 14 brought to atmospheric pressure

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As is well known, that corresponds in everyone

Moment in the line 1 of the rotary valve 3 assumed angular position of the amount of air flowing in the line. The larger this amount of air is, the more the turning _Λ open flap 3 »wherein a substantially constant (or 13 varying according to the characteristic of the spring) vacuum established in the lying between the two throttle bodies 2 and 3 chamber. 9 The rotary valve 3 can be replaced by equivalent throttle elements, examples of which are given in the patent application mentioned. . ·

The injection means are through a

Formed (not shown) source for the delivery of fuel under pressure, whose in the line 1 downstream of the Hauptdros- 'selorgan 2 opening delivery circuit is controlled by at least one actuated by a W solenoid 17 valve 16.

The dispensing system includes a flat, opaque disk 18, which goes from one to its plane vertical shaft 19 is given a continuous rotary movement. The disk 18 is located between a light source 20 and a receiver, for example a photocell 21, these both parts are carried by a common holder 22 connected to the auxiliary throttle element 3, and is in the disc at least one window 23 is provided, which allows the light beam coming from the light source 20 to pass through to the cell 21. The cell 21 is designed to control the excitation of the electromagnet 17 depending on whether it is illuminated 'jj or not, whereby the design is such that the electromagnet only turns on a fraction of each revolution the disc 18 is excited, which is in the same direction with the The degree of opening of the throttle member 3 changes.

The light source 20 can be formed by a light bulb which is fed by a battery 24 is, as soon as the 2ündkontakt 25 of the Motor3 is made, and which is disposed in a perforated hollow boss 26 '. This hole has such a location that ea directs a light beam onto the cell 21 via a hole in a hollow extension 27 containing this cell.

In the illustrated embodiment

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the lugs 26 and 27 from the ends of the U-shaped Holder 22 carried, which engages over the disc 18 so that the light source 20 and the cell 21 on both sides of the Disc lie, the holder is firmly connected to the axis 4, which is to the shaft 19 as well as to that of the cell 21 received light beam is parallel.

To evaluate the currents generated in the cell 21, between this and the electromagnet 17 a booster relay 28 and possibly a current limiter 29 can be arranged.

If so, the internal combustion engine several each

has a cylinder fed by a valve 16 actuated by a single solenoid 17, all of them can be operated at the same time Control electromagnets, or one synchronized with the disk 18 Provide distributor 30 to successively supply the intermittent excitation current to the various electromagnets feed, the disc has as many windows 23 as there are cylinders to be fed. These windows are uniform distributed around the shaft 19, and each has a shape such that that the fraction of a revolution during which it normally allows the cell 21 to be illuminated, as appropriate the opening of the throttle member 3, i.e. (in the embodiment shown) in accordance with the approach of the lugs 26, 27 to the wave ί9, increases.

As is known, the above feed device works as follows.

According to the increase in air flow

in line 1 opens the throttle member 3, whereby it is the Holder 22 in which the lugs 26 and 27 of the shaft 19 approaching Sense. Each position of these lugs corresponds to a different radius of the disk 18.

Since the shape of each window 23 is so

it is determined that the fraction of a revolution while v / elchem it allows the light beam coming from the light source to pass through to the cell 21 (generation of a current in the conductor 31), as the approach of the approaches to the shaft 19 increases, it is ensured that that of each injection valve 16 the amount of fuel supplied is the same as the amount of air in line 1 changes.

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Assume now that the wave

19 is driven by an electric motor 45, which of the
Battery 24 fed via ignition contact 25 and a conductor 46
being the inference to the body of the engine 45 through
a conductor 47 takes place, according to the invention means are provided which the speed of the motor 45 in the same direction as that of the
change the internal combustion engine fed by the device, these means for the position of the throttle element 2 or 3
are sensitive. This means can be through a potentiometer
48 are formed, which is switched into the conductor 46
and is operated by a shaft 49, which is either mechanical
with the axis of the main throttle body 2 or with the axis 4 of the
Rotary flap 3 connected (and preferably directly on this
attached), in such a way that the supply voltage of the motor sioh ', -, in the same direction as the degree of opening of the throttle body in question ^
2 or 3 changes. According to the scheme of the Pig. 2 is that of the Motoje
The highest voltage supplied is that of the battery 24.

The above device operates as follows. / *

When the ignition contact 25 is made,

drives the electric motor 45, the disc 18 at * Since the Speiaespaft- "· voltage of the motor 45 in accordance with the opening of the appropriate v | increases the throttle member, the speed of the motor 45 '^ & varies in the same direction with that of the internal combustion engine, since for low.. 1Ά 'loads of the engine, the main throttle body or _the% ^ auxiliary throttle device is only slightly opened, then the dining, | £ il of the electric motor 45 voltage small, so that his DrehaaHl ^ JI is small enough to consecutive Einspritadauern "ER tt «J £ j | j possible which are greater than that which would be obtained ^ M if the motor 45 was always running at a maximum speed" Cv ^. ?? γ

The invention can of course be modified "j \

will. So the auxiliary motor does not need an electric motor to aein, '* ^r ? ~ $ J but can in particular be formed by a (pneumatic or' 3 "'£ hydraulic) mid-flow motor. * -" · *

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Claims (3)

- ö - 3644-70 Claims 1 ·)) Device for supplying internal combustion engines with fuel, which in their inlet line in front of a main throttle device operated by the driver Auxiliary throttle body, which is automatically and continuously according to Depending on the increase in the amount of air flowing in this line, means for injecting liquid fuel opens Pressure in the section of this line located behind the main throttle body, as well as a metering system, which for the position of the auxiliary throttle is sensitive and regulates the amount of fuel injected so that the content of the The air-fuel mixture flowing through the inlet line is practical, at least for certain engine operating conditions is constant, the injection means being constituted by a source for supplying fuel under pressure, the in the said section of the inlet pipe leading to the conveying circuit by at least one actuated by an electromagnet Valve is controlled, the dosing system having a member to which a uniform rotary movement is given, and which by influencing the excitation of the electromagnet, the opening of the valve on only a fraction of each can determine its revolutions, the system being so designed is that e3 this fraction according to the increase the opening of the auxiliary throttle device is enlarged, and, vice versa, whereby the rotating member is driven by an auxiliary motor, according to the main patent ..... (patent application P 18 02 381 «9 from 10.10.68), characterized by means (48, 49) »which the Change the speed of this auxiliary motor (45) in the same direction as the speed of the internal combustion engine. 2.) Device according to claim 1, characterized characterized in that the means (48, 49) for changing the speed of the auxiliary motor for the position of the main throttle element (2) or the auxiliary throttle element (3) are sensitive. 3. Apparatus according to claim 1 or 2, characterized in that when the auxiliary motor (45) is an electric motor is, the means (48, 49) for changing its speed are designed so that they the supply voltage of the elec- 1 09838/1088 _ 9 -. 3644-70 tromotors in the same direction as the speed of the combustion engine change. 109838/1088