DE1122326B - Device for low pressure fuel injection - Google Patents

Description

GERMAN

PATENT OFFICE

R26755Ia / 46c ²

REGISTRATION DATE: NOVEMBER 18, 1959

NOTICE THE REGISTRATION AND ISSUE OF EDITORIAL: JANUARY 18, 1962

The invention relates to a device for low-pressure fuel injection, which is particularly applicable to motor vehicle engines.

In a patent specification dealing with a patent subject filed earlier than this is already unpublished has been proposed, a device for continuous pressure atomization of fuel in the intake duct system of an internal combustion engine in the following manner. It is an injection system with one revolution of its own, a constant one Injection pump delivering fuel quantity and with regulation of the injected fuel quantity (and thus of the fuel-air ratio of the fuel-air mixture supplied to the engine) as a function of control signals that a) the throttle valve position and / or b) the engine speed and / or c) the negative pressure in the suction line (possibly also from the barometer reading, the Machine temperature, the will of the driver, etc. m.) are given.

The prior patent subject is characterized in that the injection pump in itself in the earlier patent than known presupposed manner driven by a controllable electric motor is, with at least two of said control signals or parameters a), b) or c) the speed affect this electric motor.

Purpose of the mentioned injection system was the creation of a very simple, reliable and cheap fuel pump including regulation, which with known mechanical and electrical components can be adapted very easily to the operating conditions of the respective engine.

This purpose is also the basis of the subject matter of the invention. The latter is one for Internal combustion engine specific device for low-pressure fuel injection, in particular for continuous intake manifold injection, with an electrically driven injection pump as well as with a the electrical control device which changes the pump output and which is dependent on various the injection influencing parameters such. B. from the negative pressure in the suction port, from the speed the internal combustion engine, the load, the external air pressure, the machine temperature, is influenced by the specific weight of the fuel or the like.

The subject matter of the invention is based on the assumption that the injection pump is already proposed in itself Way of one of various of the parameters mentioned (z. B. reciprocating device for low pressure fuel injection

Applicant:

R. E. T. E. M. Recherches et Etudes

Electroniques et Mecaniques, Societe Anonyme, Casablanca (Morocco)

Representative: Dr.-Ing. F. Wuesthoff, Dipl.-Ing. G. Pulse and Dipl.-Chem. Dr. rer. nat. E. Frhr. v. Pechmann, patent attorneys, Munich 9, Schweigerstr. 2

Claimed priority: France of November 18, 1958 (No.PV 779 574)

Maurice Guiot, Paris, has been named as the inventor

supply frequency-influenceable and / or amplitude-influenceable) electric motor is driven. While however, in the system already proposed, the fuel supply from the pump directly without Intermediate metering devices to the intake manifold of the internal combustion engine takes place, is in Difference or excess to this is also provided in the present case that in per se in a different context As is known, a main metering device for normal operation in the pressure line of the pump (Power output) of the internal combustion engine and another metering device for idling provided which are both controlled as a function of the negative pressure in the intake manifold.

Fig. 1 is a simplified diagram for explaining the basic idea of the device according to the invention;

Fig. 2 shows in section an embodiment of the main metering device and the idling device.

According to FIG. 1, the device according to the invention for low-pressure fuel injection consists of a fuel tank 1 to which an electrically operated pump 2 is connected.

This pump 2 can be arranged in the container itself or in its immediate vicinity. The winding 2a of the pump driving device

109 760/129

3 4

is excited by impulses or vibrations which move the chamber 48 to the nozzle 47 (to which the a transistor circuit 3 can be generated. At spray nozzle 18 leading pipeline 17 is connected an electromagnetically operated pump causes the is) or to the mixer 21. Steering or division Winding 2 a the reciprocating movement of the fuel in operating fuel and the idling Pump diaphragm. In this case, the delivery of fuel takes place through a contiguous amount of valves and pressure of the flaps 50 and 51 delivered by the pump. The valve flaps 50 and 51 Fuel of the amplitude and frequency of the are through the rod 45 of the vacuum regulator the impulses supplied by the generator 3. 46 actuated. This essentially consists of one The pulses supplied by the generator 3 can be resilient diaphragms 52 attached to the rod 45. at will, depending on the different io This membrane is located in a tight-fitting, the injection influencing parameters the chamber 53, which is through a nozzle 54 and the to be changed. This is schematically shown in Fig. 1, pipe 11 in connection with the inlet connection by some devices 4, 5, 6, 7 and 8. When the vacuum in the inlet port is low indicates, which is on the pulse generator 3 in such a way (fully opened inlet), so the membrane act that the pulses depending on the 15 displaced by a spring 55, the flexibility of which various parameters can be changed. The opening device desired for the valve flap 50 4 influences the generator 3 is adapted in the dependent characteristic.

of the speed of the motor, the device an adjustable abutment 56 allows the exact Device 5 influences it as a function of the adjustment of the spring 55. A hood 57 causes the load, the device 6 depending on the 20 tight seal. As the movements of the valve temperature of the engine, the device? in flap 50 as a function of the vacuum dependency the external air pressure and the device are correct, there is an adjustment option device 8 depending on the specific weight of the choice of the passage cross-section for the fuel, substance between chambers 42 and 48. When

The pulse generator 3 is also provided by an example that can have this passage cross section Vacuum regulator 9 can be changed as a function of the one in that the in a cylinlaßstutzen prevailing negative pressure influences. This drischen bore 59 displaceable rod 45 with Vacuum regulator 9 is provided by a pipe 11 inclined surfaces 58. The rod 45 could with a point of the inlet connection downstream of also be conical in this part. the air throttle 12 in connection. This throttle 12 30 with the valve flap wide open is also the Durchist indicated schematically in the form of a flap, let cross-section between the inclined surfaces 58 and the which is opened by the accelerator pedal 14. Bore 59 is largest, while with little

The electrically operated pump 2 supplies both the open valve flap and the fuel is throttled,

the main metering device 15 as well as the idle The valve flap 51 for idle is so resilient

device 16 with fuel. The main metering unit 35 is mounted on the rod 45 so that it is only then

direction 15 lets the fuel through a pipe opens when the seal 50 a of the valve flap 50

Device 17 get into the injection nozzle 18, which is already in contact with its seat. The valve flap 51

Mixing chamber 19 opens. is operated by means of a small disc 60, which

The idle device 16 lets the fuel in against a cap 61 when the spring 62 which

the mixing device 21 reach, to which a metering 40 the valve flap 51 during the closing of the

device 22 for the idle air is connected. Holds flap 50 in the closed position, completely

The mixer 21 is clamped by a pipeline 23.

an injection nozzle 24 connected for idling, which is in the idling device is in the cover 63 of the

the mixing chamber 19 is screwed in at a point behind the single main metering device. she consists

spray nozzle 18 opens. 45 from a conventional mixer 21 with a venturi nozzle

The vacuum regulator 9, the pulse generator 3 21a. The fuel is atomized by

influenced, also controls the main dosing device the action of an air jet, which through the measuring

tunglS, the idling device 16 and the metering nozzle 65 a and metered by the throttle screw 64

device 22 for the idle air, namely this is set. Dosing the fuel for

everything depending on the in space 13 behind the 5 ° idle takes place through a measuring nozzle 65. The air for

Throttle 12 prevailing negative pressure. Idle reaches the mixer 21 through a pipe

The actual injection device includes downstream line 66. The pre-emulsified idle mixture is

the mixing chamber 19 an atomization and emul on the outlet side of the Venturi nozzle 21a through a

yaw housing 25, which is fed through the nozzle 26 to the inlet pipe 23 of the idle nozzle 24,

the motor's exhaust chambers is connected. 55 Adjusting the air for idle is done by

The main metering device 15 and the idle a vacuum regulator 67, which is basically like the

Device 16 are summarized as shown in FIG. 2, controller 46 is formed. The valve flap 68 is in

however, they can optionally also be operated separately in the same way as the flap 51. These

will. Valve flap 68 opens a little earlier than that

It is useful that the air and the fuel 60 flap 51, thereby in the Venturi nozzle 21 α one

for idling in front of the inlet in the inlet port to produce negative pressure, which prevents the passage of the

be emulsified, however, this requirement is fuel immediately at the beginning of the opening of the flap

not decisive. 51 favored. The two valve flaps 51 and 68

The fuel delivered by the pump can only open at most at the same time. To be there-

The idle air enters the calming chamber 69 through the connecting piece 41, the annular channel 43 and the 65

Holes 44 in a closed chamber 42. the device takes place via an air inlet with

According to the position of the rod 45 of the sub-holes 72 and a pre-nozzle 70, which with a

The fuel reaches pressure regulator 46 either via air filter and noise damper 71.

As already mentioned, the main air is set by means of a conventional device with a throttle valve 12 (FIG. 1) which is actuated by the accelerator pedal 14.

Fig. 2 shows a practical embodiment of the device for electrically effected correction of the Delivery rate and pressure according to the power or load required from the engine.

A slide resistor 98 is attached to the rod 45 of the vacuum regulator 46. The spindle 97 passes through the adjustable abutment 56. The resistor 98 is supplied with current by an insulated connection terminal 99 which is enclosed in the hood 57 so as to be tightly closed. A spring 100 makes the electrical connection to the resistor 98 and also allows the diaphragm 52 and the valve flap 50 to move.

The current drawn off exits through a connection terminal 101 which is tightly enclosed in the hood with insulation at the side. This terminal is connected to an inner contact spring 102 . The resistance 98 changes as a function of the position of the rod 45, and the changes in the resistance influence the pulses which actuate the pump 2.

Claims (5)

PATENT CLAIMS: 1. For internal combustion engines specific device for low-pressure fuel injection, in particular for continuous intake manifold injection, with an electrically driven injection pump and with an electrical control device that changes the pump output, which depends on various parameters influencing the injection, such as. B. from the negative pressure in the intake port, the speed of the internal combustion engine, the load, the external air pressure, the machine temperature, the specific weight of the fuel od. The like. Is influenced, characterized in that the injection pump (2) in itself already as proposed is driven by an electric motor (3) which can be regulated by various of the parameters mentioned and that, in addition, in a manner known per se in the pressure line of the pump, a main metering device (15) for normal operation (power output) of the internal combustion engine and a further metering device device (16) for idling are proposed, both of which are dependent on the negative pressure can be controlled in the intake manifold. 2. Apparatus according to claim 1, characterized in that the main metering device (15) axially via a device (52) actuated as a function of the suction nozzle negative pressure displaceable rod (45), a rigidly connected to this rod and the fuel flow controlling valve flap (50) and a valve flap (51) controlling the idle fuel flow comprises, and that the valve flap (51) is connected to the rod (45) via a spring, that it only opens when the first valve flap (50) is just closing. 3. Apparatus according to claim 2, characterized in that the main metering device to adjust the pressure and the amount of fuel to be injected in known Way has at least one passage (59, 58) of variable cross-section. 4. Apparatus according to claim 3, characterized in that the passage with variable Cross section consists of a cylindrical bore (59) through which the valve flaps supporting rod (45) is guided and its cross-section, as known per se, in the Bore changed in the axial direction. 5. The device according to claim 1, characterized in that the idler device in a known manner from a first nozzle (65) for metering the idle fuel, a mixing device with a Venturi nozzle (21α) into which the first nozzle opens, a second nozzle (65 ä) for metering the idle air and a regulating screw (64) for adjusting the idle air. Considered publications:
German Patent No. 703 155;
U.S. Patent No. 2,807,244;
VDI-Zeitschrift, 99 (1957), No. 20, 11. JuU, p. 886; Publication about the Solex downdraft type 28 PCI carburetor, published by the Deutsche-Vergaser-Gesellschaft Neuss and Berlin (May 1955 Breker-Druck, Cologne), p. 5. Legacy Patents Considered:
German Patent No. 1,069,940. 1 sheet of drawings 760/129 1.62