DE2108069A1 - Device for supplying internal combustion engines with fuel - Google Patents

Description

Dr F Znnirtrin scm. - Dr. Π. Patents hurried

8 Munich 2, Bräuhausstraße 4 / Ul

3791-70

SOCIETE INDUSTRIELLE DE BREVETS ET D'ETUDES S.I.B.E.

Gate direction for supplying combustion engines with fuel.

Addition to the main patent (patent application No. P 18 02

381.9 of the applicant from 10.10.1968)

The invention relates to the devices

for supplying internal combustion engines with fuel, which in A of their intake line has a preliminary or auxiliary throttle element in front of a main throttle element operated by the driver, which is automatically and continuously in accordance with the increase &&? In this line flowing air stream opens, means for injecting liquid fuel under pressure into the section of this line located behind the main throttle element and finally 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 intake line at least for certain Betrxebobedin-

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the engine practically remains constant, with this Injection means through, a source of supply of fuel formed under pressure, the pressure circuit of which opens into this section of the suction line through at least one is controlled by a solenoid operated valve.

The invention particularly relates to

such devices, which were used on 10.10.1968 filed German patent application No. P 18 02 361.9 of Applicant are trained, and the dosing system contains a member, which is given a constant rotary movement, and which by influencing the excitation of the solenoid, the opening of the valve on only a fraction of a can determine each of its revolutions, this system being designed so that it can determine this fraction according to the Increase in the opening of the auxiliary throttle member increased, and vice versa.

Furthermore, the invention relates in particular to such devices in which the source for supplying fuel under pressure is formed by a fuel pump, on the pressure line of which a pressure regulator acts, which contains a relief valve which opens and under the action of the delivery pressure of the pump tries to close the effect of the negative pressure which prevails in the section of the same lying between the two throttle organs of the suction line and is transmitted through a connection channel to a membrane to which the valve is connected.

As is known, the position of the auxiliary throttle member is characteristic of the air volume flowing from the upstream side to the downstream side of this member. If the volume of the section of the intake line between the intake valves of the internal combustion engine and the main throttle element is large compared to the cylinder capacity of the engine, the amount of air measured by the auxiliary throttle element in the transition state (acceleration or deceleration) is not exactly the same as that actually from the suitcase to it Time recorded.

When slowing down sharply, 2, B,

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ORiGiNAL INSPECTED

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the amount of air measured by the auxiliary throttle body as a result of the Closure of the main throttle organ quickly. On the other hand, the motor takes one until the new steady state is set certain amount of air, which corresponds to the pressure drop in the intake line and therefore not from the auxiliary throttle is measured. As a result, the engine has too poor an air-fuel mixture until the steady state is set receives, so that the motor no longer works properly.

To remedy this disadvantage, there is one

inventive power supply device of the above type characterized in that arranged on the communication passage throttling means, which produce a ™ smaller flow cross section in the suction line from said portion of the arrival * going to the membrane of the pressure regulator sense than in the reverse sense.

In this training, the

Velocity of change of the transmitted to this membrane The vacuum level is such that even when accelerating and decelerating, the content of the air-fuel mixture is practical is kept constant.

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

Pig. 1 shows a partially cut

schematic side view of a designed according to the invention Feeding device. |

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

The device is on the whole to any

suitably designed and contains in their suction line, 1 in front of a main throttle element 2 operated by the driver, a preliminary or auxiliary throttle element 3, which is automatically and opens steadily in accordance with the increase in the amount of air flowing in line 1, the flow direction in FIG indicated by the arrow P, as well as means for injecting liquid fuel under pressure into the rear of the main, throttle body 2 lying section of the line 1, and finally a dosing system, which is used for the position of the auxiliary throttle

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selorgans 3 is sensitive and the injected Brenneioiinienge regulates so that the content of the flow in line 1 Air-fuel equipment at least for certain operating conditions of the engine is practically constant.

In the illustrated execution forti

the auxiliary throttle member 3 is formed by a rotary flap fastened on a shaft 4. This flap is actuated by a pneumatic device with a membrane 5 separating two chambers 6 and 7 from one another. The chamber 6 is connected by a channel 8 to a chamber 9 which is formed by the section of the line 1 lying between the main throttle element 2 and the rotary valve 3. The axis 4 is firmly connected to a lever 10 which is provided at its free end with a pin 11 which cooperates with the end of a rod 12 connected to the membrane 5. A spring 13 constantly seeks to close the rotary flap 3 against the effect of the negative pressure transmitted to the chamber 6. The atmospheric pressure is established in the chamber 7 by a duct 14, which preferably starts from the air inlet 15 of the suction line 1.

It is known that the angular position assumed by the flap 3 at any time within the line 1 corresponds the amount of air flowing in this line. The greater the amount of air is, the more the flap 3 opens, so that a practically constant (or according to the parameters the spring 13 changing) vacuum is set in the chamber 9 lying between the two throttle elements 2 and 3. The flap 3 can be replaced by equivalent throttling devices, for what examples are indicated in the main patent.

The injection means are through a

Source for the supply of fuel under pressure is formed, which is described in more detail below, and its i.i the line 1 behind the main throttle body 2 opening through the pressure circle at least one valve 16 actuated by an electromagnet 17 is controlled.

The dosing system contains a flat, opaque disk 18 which is carried by a shaft 19 is, which preferably with the {not shown) of the

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Device-fed internal combustion engine connected lax, so that the disc is given a uniform rotational movement about an axis perpendicular to its plane. The disk 18 is arranged between a light source 20 and a receiver, for example a photocell 21, which are carried by a common holder 22 connected to the auxiliary throttle element 3, and the disk contains at least one window 23 for the passage of the light source 20 coming through Light beam to the photocell 21. The photocell 2.1 is designed so that it controls the excitation of the electromagnet 17, depending on whether it is illuminated or not, and is designed so that the electromagnet on a fraction of each revolution of the disc 18 is excited ', which changes in the same direction with the degree of opening of the throttle member 3. |

The light source 20 can be formed by a light bulb which is fed by a battery 24 as soon as the ignition contact 25 of the engine is switched on and which is arranged in a hollow extension 26 provided with a hole. This hole has one Position that it directs a light beam onto the photocell 21 via a hole in a hollow extension 27 in which the photocell is housed. In the embodiment shown, the extensions 26 and 27 are carried by the ends of the U-shaped holder 22, which the disc 18 overlaps so, the light source 20 and the photocell 21 that are beiderseita 4p disc and which is fixedly connected to the axle ^ which to the shaft i 19, and to the signal received from the photocell 21 Lickt "bunch · is parallel.

To utilize the in the photocell 21

Currents generated can be between the dieee and the electromagnet 17 an amplifier relay 28 can be switched.

WewL the internal combustion engine has multiple cylinders

each of which has a single electromagnet by one 17 actuated valve 16 is fed, nan can simultaneously control all the electronic magnets or provide a distributor 30, which is synchronized with the disk 18, in order to successively the intermittent Brregerstxom the various

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To supply electromagnets, in which case the disk then has as many windows 23 as there are cylinders to be fed. These windows are evenly distributed around the shaft 19, and each of them has such a shape that the fraction of a revolution during which ea normally allows the photocell 21 to be illuminated increases according to the opening of the throttle member 3, ie # (at of the illustrated embodiment} * depending on the approach of the lugs 26 , 27 to the shaft 19.

The above feed device is known to operate as follows.

Jfach measure of the increase in the line 1 flowing amount of air opens the throttle member 3, whereby it the holder 22 in which the lugs 26 and 27 of the shaft 19 approaching sense drives · Each position of these approaches corresponds another radius of the disk 18.

Since the shape of each window 25 is so

it was determined that the fraction of a revolution during which the light beam coming from the light source 21 is to of the cell 21 passes (generation of a current in the conductor 31) t in accordance with the approach of these latter elements the wave 19 increases, it is ensured that that of each Fuel quantity delivered to injector 16 see in the same direction with the Luftmeijige in line 1 changes.

? The source for the delivery of a liquid under pressure is formed by a fuel pump 50, the suction line 51 of which is immersed in a fuel tank 52, and the pressure line 53 of which is the same. Pressure regulator 54 acts. This contains a relief valve 55 t which tries to open under the action of the delivery pressure of the pump and to close under the action of the negative pressure prevailing in the chamber 9, this negative pressure being transmitted through a connection channel 56 to a membrane 57 , which the .Yentil 55 is connected by a rod 58. The valve 55 cooperates with a seat 59, which forms the outlet of a chamber 60 connected to the pressure line 53 by an A or branch 61. The connecting channel 56 leads iju a chamber of variable volume 62, which is fed through one side of the membrane

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ORIGINAL INSPECTED

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is bordered, the other side of which e.g. by an opening 63 is exposed to atruospheric pressure. The training is so hit that the valve 55 opens as soon as the pressure in the line 53 has reached the surface of the membrane 57 and exceeds the value determined for this underpressure.

If the suction pipe 1 includes downstream of the main throttle member 2, a relative to the ZyIinderinhalt the motor large volume 64, according to the invention are arranged on the connection duct 56 throttle means 65 which has a smaller flow cross-continuous in the limited from the chamber 9 to the vender diaphragm 57 chamber 62 sense a (Pig · 1) than in the opposite sense (sense b_). ^

The throttling means 65 are expediently grounded by two in two parallel Zv / eige 56a and 56t> of the connecting channel 56 switched on calibrated openings 66a and 66b_ and a check valve 67 is formed, which is loaded by a spring 68, in series with one (66b) of the calibrated Arranged openings and is designed so that it lets through the air in the second sense above (sense b).

The device according to the invention operates in the following manner.

At a slowdown, i.e. at a

Closing the main throttle element 2, the amount of air entering the volume 64 is smaller than that supplied to the engine, since the pressure in this volume 64 decreases. Since the position but not the measures \ of the auxiliary throttle device 3, the air flowing through this amount consumed by the motor, a quantity of fuel to poor air-fuel mixture would result. According to the invention, however, the rate at which the fuel pressure drops in the event of a slowdown is limited by the presence of the opening 66a. In order to lower the fuel pressure, air has to flow in the direction of the arrow a. Since the spring 68 presses the valve 67 onto its seat, the air can only flow through the opening 66ji. The smaller the opening 66a, the lower the rate of decrease in the fuel pressurea

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When accelerating, the speed becomes the increase in fuel pressure in eη5s-preilender ¥ limited. The air then flows in the direction of the arrow jb, and the air rushes through the two openings 66a and 66b.

A zvreckmässige choice allows both openings so _r an almost constant content of the air-Brennstoffgesisehs even during the transient states (acceleration and Yerlangsaraung) of the internal combustion engine aufroeiitsuerhalten this.

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Claims (1)

- 9 - 3791-70 Claims Device for supplying internal combustion engines with fuel, which in their intake pipe before a main throttle device operated by the driver a pre- or Help sdrosselorgan i - ·, which is automatically and steadily according to the increase in this Line flowing air volume opens, means for injecting liquid fuel under pressure into the downstream of the main throttle body lying section of this line and finally has a metering system which is used for the position of the Auxiliary throttle body is sensitive and the amount of fuel injected regulates so that the content of the air / fuel mixture flowing in the intake line at least for certain loads operating conditions of the engine remains practically constant, this means of injection by a source for the supply of Fuel are formed under pressure, the pressure circuit of which opens into this section of the suction line through at least a solenoid operated valve is controlled, the metering system including a member, which is a permanent Rotary movement is given, and which by influencing the excitation of the electromagnet opens the valve on only a fraction of each of its revolutions, this system being designed so that it can determine this fraction enlarged in accordance with the increase in the opening of the auxiliary throttle element, and vice versa, the source for delivery formed by fuel under pressure by a fuel pump, is, on whose pressure line a pressure regulator acts, which contains a relief valve, which is under the action of the To open the delivery pressure of the pump and under the effect of the negative pressure su seeks to close, which in the one between the two Drosselor ^ anen the suction line lying section of the same prevails and is transmitted through a connecting channel to a membrane, with 'v / which the valve is connected to, according to which Main patent ..... (patent application no. P 18 02 381.9 of 10JO. 1968), characterized in that on the connecting caral (56) Throttle means (65) are arranged, which in the 109848/1126 BAD ORfSfNAL - 10 - 3791-70 called Absci & nitt (9) of the suction line (1) going to the membrane (57) of the pressure regulator (54). It makes sense to create a smaller flow cross-section than in the opposite sense. 2 ·) Device according to claim 1, characterized in that the throttle means by two in two parallel. Branches (56a _t 56Jb) of Yerbindungskanals (56) is ~ placed calibrated openings (66a * 66b) and a Hückschlagventil (6?) Is formed, which is connected with a (66Jb) of the ka- libri Erten openings in the legs and formed to that it lets the air through in the »second, stated sense (b) · 109846/1126 I ^U ■ «■ egg soap