DE2125959A1 - Device for feeding internal combustion engines with fuel - Google Patents

Description

Dr. F. Zumstein Sr. - Dr. E. Assmann
Dr. R. Koenrgsberger - Dipl. Phys. R. wooden door

Dr. F. Zumstein jun.

Patent attorney

8 Munich 2, BfäuhauMtraß 4 / III

SOCIETE INDUSTRIELLE DE BREVETS ET D ¹ ETUDES SIBE 3095/71 ■ Device for supplying combustion engines with fuel.

Addition to the main patent ... (patent application number 18 02 381.9

from 10.10.1968)

The invention relates to the devices

for supplying internal combustion engines with fuel, which are actuated by the driver in their inlet line in front of one Hauptdro3selorgan an auxiliary throttle organ, which is automatically and steadily according to the increase in this Line flowing air volume opens ι means which liquid Fuel under pressure in the downstream of the Inject the main throttle body lying section of this line, as well as having a metering system which is sensitive to the position of the auxiliary throttle oil organ and which regulates the amount of fuel injected so that the content of the air-fuel mixture flowing in the inlet line is at least at least remains practically constant for certain operating conditions of the engine, these injection means by, a source for the supply of fuel under pressure

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its in the said section of the inlet pipe mouthing feed circuit through several each of one! electromagnet actuated valves is controlled.

The invention relates in particular to such devices in the main patent (patent application No. 18 02 381.9 of the applicant from 10.10.1968) Kind in which the dosing system contains a member, which a constant rotary motion is given by the internal combustion engine, and which by acting on the excitation of each Electromagnets on only a fraction of each of its revolutions open the opening of that electromagnet operated valve determined, the system being designed so that it is this fraction in accordance with the increase in

j) The opening of the hip throttle is enlarged, and vice versa.

The invention relates in particular to

if not exclusively, some of these devices, in v / elchen the constantly rotating song Hittel has, v / elche to a stationary receiver Sending out energy flow during a fraction of a revolution, the value of which is a function of the mutual position of the rotating member and the receiver changes, the receiver being adapted to provide an excitation current for every electromagnet generates, depending on whether it receives the flow of energy or not, while the auxiliary throttle organ does so is designed so that the mutual position of the rotating

k changed the limb and the receiver, with the the flow of energy emitting means a light source and the receiver a light-sensitive element, e.g. a photodiode, the light source and the light-sensitive element are arranged on both sides of the rotating member, which is designed as an opaque screen, v / which at least one window for the illumination of the light-sensitive Elements contains.

The 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.

109852/1238

The cited patent describes in particular for internal combustion engines with several cylinders (or groups of cylinders), each by one of its individual electromagnets actuated valve are fed, a feed device with a distributor, which with the rotating Member is synchronized in order to successively supply the various electromagnets with the intermittent excitation current

The distributor described in detail

contains moving mechanical parts, which produce signs of wear and tear and noise and proportionally are bulky.

The invention aims to remedy these disadvantages "

For this, the feed device is after

the main patent with a distributor which is synchronized with the rotating member and successively the different ones Electromagnets supplies the intermittent excitation current, characterized according to the invention in that the distributor by at least one arrangement with a light source, a photosensitive element and electronic Gates is formed, with the light source and the photosensitive element on either side of the rotating member are arranged so that this depending on its angular position the bundle of light between the light source and the light-sensitive The element is interrupted or not, the design being such that this light-sensitive element, depending on whether it is illuminated or not, there is a control current on the gates so that they in turn control the Feed the excitation current to the various electromagnets one after the other.

In the preferred embodiment, at v / elcher the dosing system itself has a light source and a Has light-sensitive element, which on both sides of the rotating member designed as an opaque screen are arranged, which window for illuminating the photosensitive element during one of the position dos auxiliary screw organs depending on a fraction of a turn of the rotating member, the inventive

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- 4 - 3095 - 71

according to the feed device characterized in that the light-sensitive element of the dosing system in combination with the light-sensitive element of the distributor, the gates of the distributor controls.

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

Fig. 1 shows in a schematic, for

Partly sectioned side view of a feed device according to the invention.

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

FIG. 3 shows the electronic circuit ″ of the distributor of FIG.

FIG. 4- shows the voltage levels at various points in FIG. 3.

The device is constructed as a whole in any known manner and includes, for example (Figs 2) an auxiliary throttle element 3, which automatically and steadily in accordance with the increase in the in of the line 1 flowing air volume opens, whereby the flow direction indicated by the arrow F in Fig. 1, means for injecting liquid fuel under pressure in the strömungsab.wärts of the main throttle body 2 Section of the line 1, and a metering system, which is sensitive to the position of the auxiliary throttle member 3 and the injected Controls the amount of fuel in such a way that the content of the air-fuel mixture flowing in line 1 is at least practically constant for certain engine operating conditions is.

In the illustrated embodiment

the auxiliary throttle member 3 is attached to an axis 4 by a Flap formed. This flap is operated by a pneumatic device with two chambers 6 and 7 apart separating membrane 5 actuated. The chamber 6 is connected by a channel 8 with a chamber 9 »which through the lying between the main throttle element 2 and the flap 3

1 098S2 / 1238

Section of the line 1 is formed. The axis 4 is fixed with connected to a lever 10, which is provided at its free end with a pin 11, which with the end of a rod 12 cooperates with which the membrane 5 is connected. One The spring 13 constantly tries to close the flap 3 against the effect of the negative pressure transmitted to the chamber 6. In the chamber 7 is the atmospheric pressure through a channel preferably emanating from the air inlet 15 of the line 1 14 upheld.

As is known, corresponds to that of the flap

3 angular position assumed in line 1 at any time of the amount of air flowing in this line. The greater this amount of air is, the more the flap 3 opens, and there is a practically constant (or according to the parameters the Peder 13 changing) negative pressure in the chamber 9 between the two throttle organs 2 and 3. The flap 3 can be replaced by equivalent throttling devices, for which examples are given in the main patent.

The injection means are through a

(not shown) source formed for the supply of fuel under pressure, whose in the line 1 downstream from the main throttle body 2 opening delivery line through each Valves 16 actuated by an electromagnet 17 are controlled. '·

The dosing system includes a flat opaque disc 18 which is connected to the through the Device-fed (not shown) internal combustion engine connected shaft 19 is carried so that the disc a constant rotating movement around a perpendicular to its plane Axis is granted. The disk 18; is between a light source 20 and a photodiode 21 arranged »which of a common shark * connected to the auxiliary valve organ 5 ter 22, and contains windows 23 »around that of the light source 20 coming light bundles to the photodiode 21 to pass. The photodiode 21 is formed so that it generates an exciting current for the electromagnet 17, depending after whether or not they lit iat and the training is so taken that this current during a fraction

of each revolution of the disk 18 is generated, which is changes in the same direction as the degree of opening of the throttle member 3.

The light source 20 can be formed by an incandescent lamp which is fed by a battery 24 as soon as the ignition contact 25 of the engine is switched on, and this incandescent lamp is placed in a hollow boss 26 provided with a hole. This hole has such a location that it directs a light beam onto the photodiode 21 via a hole in a hollow extension 27 in which the photodiode is arranged is.

In the illustrated embodiment, ~

the lugs 26 and 27 from the ends of the U-shaped holder 22 carried, which overlaps the pane 18 so that the light source 20 and the photodiode 21 on both sides of the pane this holder is firmly connected to the axis 4, which is connected to the shaft 19 as to that received by the photodiode 21 Light beam is parallel.

To evaluate the currents generated in the photodiode 21, there are between the latter and the electromagnets 17 a distributor 70 and an amplifier 28 are connected.

The manifold 70 is connected to the disk 18

synchronized to successively the intermittent excitation current to send into the various electromagnets, v / c-with the disc has as many windows 23 as cylinders or Cylinder groups are to be fed. These windows are evenly distributed around the shaft 19, and each of them has such a shape that a fraction of a revolution, during which it usually put the lighting of the photodiode 21, increases in accordance with the opening of the throttle member 3, i.e. (in the embodiment shown) in accordance with the approximation of the lugs 26, 27 to the shaft 19

The above feed device is known to work as follows

According to the increase in the amount of air

in line 1, the throttle member 3 opens, whereby it is the Holder 22 takes along in the sense that approaches the lugs 26 and 27 of the shaft 19. Each position of these approaches corresponds another half of the disk 18.

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Since the shape of each window 23 has been determined as _f that the fraction of a revolution, during which it transmits the coming from the light source 20 light beam to the photodiode 21, in accordance with the approach of the latter / elle to the V 19 increases, it is ensured that the amount of fuel supplied by each injection valve 16 changes in the same direction as the amount of air in line 1.

According to the invention, the distributor now contains

70, if it is to be associated with two electromagnets 17 (as shown in FIG. 3) or two groups of such electromagnets, two AND circuits 71 and 72 electrical signal and applied through two conductors 75 and 76 the electrical signal, which is supplied by a second photodiode 77, which is fixedly arranged opposite a second light source 78 so that the disk 18 arranged between the light source 78 and the photodiode 77 is the Light source 78 may or may not interrupt incoming light bundles depending on their angular position. For this purpose, the disk 18 can be formed by two semicircles of different diameters united by shoulders 79, and the photodiode 77 and the light source 78 can be arranged at the location of the larger edge of the disk 18, as shown in FIGS.

The electrical signal supplied by the photodiode 77 is passed through the conductor 75 directly to the gate circuit 71 and the gate circuit 72 via an inverting circuit 80. The output parameters £ and £ of the gate connections 7ΐ and 72 are amplified by the amplifier 28, and the boosted current is supplied to the two electromagnets 17 through conductors 81 and 82.

The way the distributor works is in

4 explains in which the voltages at points a, h, £, d, £ and f are entered as a function of time Jt. The voltages a and b are those of the currents coming from the photodiodes 21 and 77 and supplied to the gate circuit 71. The voltages £ and d_ are the ■■ :. ■■ * the gate circuit 72 supplied currents, of which α or first from the photodiode 21

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and the second comes from the photodiode 77 after reversal.

When the photodiode 21 is not illuminated

is (sections az - a, - and a ^ -ag), * the two gate circuits 71 and 72 are blocked, and no current flows in conductors 81 and 82 (sections e, -e ₅ $ ^e 6 "* ^e 8 »^ 3 ~ ^ 5 ♦ ^ 6 ~ ^ 8 ^" When the photodiode 21 is illuminated, only a single one of the gate circuits 71 and 72 delivers an electrical signal at the point e_ or f, depending on whether the photodiode is illuminated or not "More precisely, when the photodiode 77 is illuminated, a current flows during bj-b .; the gate circuit 71 lets the current coming from the photodiode 21 through, as shown at e ₂ -e Photodiode 77 is not illuminated, the gate circuit 72 lets the coming from the photodiode 21-

"the current through, as shown at fc-fg. ·"

As a result, current flows in the conductor 81 or 82 and one of the valves 16 opens. As in Fig. 4, it is set up so that the change of state the photodiode 77 always takes place when the photodiode 21 is not illuminated. The opening time of the Valve 16 may only be controlled by the lighting time of the photodiode 21.

This gives a simple power distribution device that can be easily adapted to the Pail may mean that the current has to be distributed over a number of channels which is greater than two. Suffice it to say a number

\ of fixed photodiodes 77 and of AND circuits 71 and 72, which is equal to the number of channels. The electric current in a channel is then obtained by illuminating the movable photodiode 21 and the fixed photodiode 77 corresponding to the channel at the same time.

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Claims (2)

2 Ί 2 b 9 5 9 - 9 - 3095-71 Claims M .J) Device for supplying internal combustion engines with fuel, which in its inlet line in front of a main throttle element operated by the driver has an auxiliary throttle element, which opens automatically and steadily according to the increase in the amount of air flowing in this line, means for injecting liquid fuel Pressure in the section of this line downstream of the main throttle element, as well as a metering system which is sensitive to the position of the auxiliary throttle element and which regulates the amount of fuel injected so that the content of the air-fuel mixture flowing in the inlet line is practical, at least for certain engine operating conditions is constant, these injection means being formed by a source for the supply of fuel under pressure, the delivery line opening into said section of the inlet line being controlled by a plurality of valves each actuated by an electromagnet, wherein the metering system has a member which is given a constant rotary movement by the internal combustion engine, this member determining the opening of the valve actuated by this electromagnet by influencing the excitation of each electromagnet on only a fraction of each of its rotations, this system being designed in this way is that it increases this fraction according to ^ the increase in the opening of the auxiliary throttle body, and vice versa, the device having a distributor synchronized with the rotating member, which successively supplies the intermittent excitation current to the various electromagnets, according to the main patent ... (patent application : P 18 02 381.9 from 10.10. 1968), characterized in that the distributor (70) is formed by at least one arrangement with a light source (78), a light-sensitive element (77) and electronic gate circuits (71 and 72), the light source (78) and the light-sensitive Element (77) are arranged on both sides of the rotating member (18) so that this depending on its angular position dad light bundle between the light source 109852/1238 (78) and the photosensitive element (77) interrupts or not, the formation being made so that the photosensitive Element (77) supplies a control current to the gate circuits (71, 72) depending on whether it is illuminated or not, so that they in turn feed the excitation current to the various electromagnets (17) one after the other. 2.) Device according to claim 1, wherein the metering system itself has a light source and a light-sensitive Element comprises, which are arranged on both sides of the rotating member, which as opaque Screen with pensters is formed, which the exposure of the photosensitive element during a fraction of a revolution enable the rotating member, which depends on the position of the auxiliary throttle member, characterized in that, that the light-sensitive element (21) of the dosing system in combination with the light-sensitive element (77) of the Distributor (70) for controlling the gate circuits (71, 72) of the distributor (70) acts. 3 «) device according to claim 2, characterized featured having two electronic UIiD circuits (71, 72) with two inputs (a, b and c, d) contains that the rotating member (18) offset two by 180 ° from one another Window (23) and that the light-sensitive elements (21, 77) are photodiodes, the photodiode (21) of the dosing system and the (77) of the above arrangement or one of the above arrangements with their outputs (73, 76) both on the inputs (a, b and c, d) of the AND circuits (71, 72) are connected, the output of the photodiode (21) of the Dosing system directly to the input (b) of one UHD circuit (71) and via an inverting circuit (80) to the input (d) the other UKD circuit (72) is switched during the outputs (e, f) of the AND circuits (71, 72) are connected to two electromagnets (17) or groups of electromagnets are* 109852/1238 lee rse ite