DE3015403A1 - FUEL FEEDING DEVICE FOR INTERNAL COMBUSTION ENGINES - Google Patents

Description

Andrejewski, Honke & Partner patent attorneys Physicist Dr. Walter Andrejewski Graduate engineer Dr.-Ing. Manfred Honke Physicist Dr. Karl Gerhard Masch Lawyer files: 4300 Essen 1, Theaterplatz 3, Postf. 100254

55 336 / V-th Ιδ. April 1980

Patent application

MITSUBISHI JIDOSHA KOGYO KABUSHIKI KAISHA No.33 - &> 5-Chome, Shiba, Minato-Ku, Tokyo, Japan

MIKUNI KOGYO KABUSHIKI KAISHA

N0.I3-II, 6-Chome, Sotokanda, Shiyoda-Ku, Tokyo, Japan

Fuel delivery instruc tion for internal combustion engines.

A fuel delivery device is already known for internal combustion engines, at which the flow rate of fuel through an electromagnetic fuel injection valve is electronically controlled, generating pulse signals which are electrical signals corresponding to the amount of intake air correspond. A disadvantage of this conventional system, however, is that due to the valve construction

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Andrejewski, Honke & Partner, patent attorneys in Essen

injected fuel is difficult to atomize, so that a really effective fuel delivery is prevented.

The invention has therefore set itself the task of providing a fuel delivery device for internal combustion engines, which significantly improves fuel atomization is injected intermittently by the one injected from the fuel injection valve Fuel is given a swirl, whereby the aforementioned difficulties are properly resolved.

A fuel delivery device according to the invention is identified for internal combustion engines essentially through an intake port, a fuel tank, a fuel injection valve in the inlet channel for intermittently injecting the fuel from the fuel tank into the inlet channel, one the Pumping fuel from the fuel tank into the injection valve Fuel pump, wherein the injection valve has a valve housing with a fuel inlet and a fuel outlet as well as having an inner space connecting the inlet to the outlet, in which an electromagnetic coil and a through the excitation and de-excitation of which is arranged a plunger which can be moved back and forth and which in turn has a valve body at one end carries, through which the fuel outlet releasable BEZW. is lockable, furthermore a device is provided, by means of which a swirl can be imparted to the fuel leaving the fuel outlet.

Further features and special features result from the following Description of some embodiments of the invention with reference to the accompanying drawings; it shows

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Pig.l a schematic representation of the invention Fuel delivery device;

2 shows a schematic representation of the function of the Flow rate of the air measuring device;

Fig. 1 a-jjc waveforms to explain the function of the device from Figure 2;

4 shows a longitudinal section through the fuel injection valve; FIG. 5 shows a section through FIG. 4 along the line V-V;

6 shows a longitudinal section through a further embodiment the device in the fuel injection valve which imparts a swirl to the fuel;

7 shows a schematic representation of a further exemplary embodiment of the invention with shown in longitudinal section Main parts; and

FIG. 8 shows a section through FIG. 7 along the line VIII-VIII.

As Fig.l and 2 show, is in an inlet line 3 between an air filter 1 and a throttle valve 2, an air flow meter 4 is provided.

This air flow meter 4 consists of a triangular prism arranged at right angles to the direction of flow of the inlet air 4a, a loudspeaker 4b working as an ultrasonic wave generator and a microphone working as an ultrasonic wave receiver 4c, both of which are in the direction of flow behind the triangular

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Prism 4a on the outer wall of the inlet pipe J5 opposite one another are arranged. In order to even out the flow of the inlet air and thus a stabilized operation of the air flow meter 4, an intake air rectifier 4 is provided.

Accordingly, as shown in FIG. 2, one of the loudspeaker 4b generated ultrasonic wave S. under the condition that behind the prism 4a a turbulence with a speed of the air flow proportional frequency is generated, an amplitude modulation and a frequency modulation caused by the turbulence subjected and then picked up by the microphone 4c. This modulated signal S. is made up of higher harmonic components freed by a wave shaper circuit 6 with a low pass filter etc. and only the modulated frequency as an envelope Component selected, creating an AC voltage signal Ew (see Fig. 2 and 3a) with one of the air flow velocity, i.e. the air volume, proportional frequency is measured, which fluctuates periodically.

This voltage signal Ew is converted into a sequence of control pulses Pw (Fig.Jb) converted by a pulse generator a microcomputer 7 used as an electrical control device are synchronized with its frequency or with its divided frequency are synchronized or follow the same.

Then, as Fig.l shows, the control pulses Pw are continuous an electromagnetic coil 8a, whereby a force

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3015A03

substance injection valve 8 is operated intermittently with the frequency of the control pulses, ie the frequency of the AC voltage signal Ew or its subdivided or subsequent frequencies synchronously or subsequently. Each pulse width of the control pulses Pw is selectively determined in accordance with the specific design or performance of the fuel injection valve δ. In addition, as shown in FIGS. 1 and 4, a plunger 8c made of magnetic material, which is exposed to the magnetic field of the electromagnetic coil 8a in the fuel injection valve δ, is seated in a valve housing 8b, ie in the interior 5b 'of this valve housing, with one end this plunger 8c is designed as a needle valve 8d which controls a fuel outlet 8m, while the other thickened end is urged by a spring 8e in the valve housing 8b in such a way that the needle valve 8d is urged in the closing direction on the fuel outlet 8m. As FIGS. 4 and 5 show, a device TU is provided by means of which a swirl can be imparted to the fuel leaving the fuel outlet 8m at a fuel injection nozzle 8f at the tip of the fuel injection valve 8. This swirl or vortex device TU is formed on the circumference of the needle valve 8d, by means of which the connection with the fuel outlet 8m 'can be interrupted intermittently. This vortex device consists of a first ring channel 8p, a second concentric ring channel 8i running on the outside thereof, which is connected to the interior space 8b ¹ connected to the fuel inlet Sn via an inner channel 8g 'by a secondary line 8h and an inner channel 8g, the two ring channels 8p and 8i are connected to one another by three connecting channels 8k. These three connecting channels 8k run as shown in FIG

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shows almost to the first ring channel 8p. Numeral 8j denotes a valve plate. Accordingly, the control pulse train Pw of the electromagnetic coil 8a of the fuel injection valve 8 is supplied by the microcomputer 7, and, when the first pulse is input, this solenoid is energized and the plunger 8c is displaced by a certain distance against the force of the spring 8e, whereby the Needle valve 8d opens and then, as shown in Pig. 4, the fuel pumped into a fuel inlet 8n of fuel injection valve 8 passes through inner ^{channel 8g r} , inner space 8b ¹ , inner channel Sg and secondary line 8h into second annular channel 8i and from there through the almost tangential connecting channels 8k into the first annular channel 8p, in which the fuel, as indicated by the arrows in FIG. Injection valve 8 leaving fuel is significantly improved.

On the other hand, when no pulse is input, the spring oe pushes down the plunger 8c, thereby holding the needle valve closed.

Each time the second, third, ... pulse of the control pulse train Pw is then input to the fuel injection valve δ is, the fuel is injected into a supply channel 9, so that the fuel injection valve 8 synchronously with the Steuerirr.pulssequence Pw injects the fuel into the inflow channel 9 intermittently. With the fuel inlet 8n of the fuel injection valve 8 is via a supply pipe 11 and its branch

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tube l4 a fuel regulator 10 with a first chamber lOb and a second chamber 10c, which is separated by a membrane 10a are separated, connected, with also a connection via a vacuum pipe 12 in the vicinity of the fuel outlet is provided in the inflow channel 9. A fuel return pipe is located between the first chamber 10b and a fuel tank IjU 15 and provided in the feed pipe 11, an electric fuel pump P, which the fuel at constant pressure promotes from the fuel tank I ^. The opening at the top End of the fuel return pipe 15 and thus the amount of Returning fuel is controlled by a valve 10d, which is operated by a spring 10e over the membrane 10a in the closing direction is printed.

When the pressure in the inflow channel 9 decreases, the pressure in the second chamber 10c also decreases, so that the membrane 10a receives the force of the spring 1Oe is pulled up and thus the valve lOd is opened, so that some of the fuel through the Fuel return pipe 15 flow back into fuel tank I ^ can. This makes the fuel pressure fuel-on injection valve 8 reduced, whereby the specified pressure differential between the fuel delivery pressure to the injection valve 8 and the suction pressure (the negative pressure in the supply pipe) near the fuel outlet is maintained.

To determine the various operating conditions of an internal combustion engine 17, such as the cooling water temperature, the Load, acceleration and deceleration, etc., a measuring device is provided which corresponds to each operating state

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electrical signal generated. This measuring device has a sensor 16a for determining the cooling water temperature, a Sensor l6b for the determination of the load on the machine I7, a Sensor 16c for determining the acceleration and deceleration and a sensor 16d for determining the oxygen content of the Exhaust gases. In addition, there is a control circuit for receiving and processing the information signals from sensors 16a to 16d 16 provided, through which the respective operating status is assessed, and electrical signals through a preprogrammed Computer generated. This control circuit is contained in the microcomputer 7 - ″ and the signals from the sensors l6a to 16d are input to this control circuit 16 through terminals A to D and then to the main control circuit of the microcomputer 7 transmitted.

Since the main control circuit is designed so that the predetermined The pulse width corresponds to the electrical signals from the control circuit 16 of the operating measuring device to the fuel injection valve 8 applied control pulses Pw can be modulated, is from the terminal E of the microcomputer 7 the Control pulse sequence Pw '(Fig. 3c) output with modulated pulse width and intermittently supplied to the fuel injection valve 8.

In Fig.l, reference numeral 18 denotes an exhaust pipe of the Machine 17.

A fuel delivery device according to the invention constructed in this way converts the flow rate of the air through the

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filter 1 sucked inlet air through the air flow meter K into an alternating voltage signal Ew with a frequency which is proportional to the amount of air flow. Then the alternating voltage signal Ew is converted into a control pulse sequence Pw, the frequency of which is synchronously or subsequently or subdivided by the microcomputer 7 and is fed to the fuel injection valve 8 so that this valve is subsequently operated intermittently in synchronization with or the control pulse sequence Pw Injection valve 8 intermittently injected fuel is swirled through, as already explained, so that its atomization is improved and an effective fuel delivery is achieved. In addition, the pressure of the fuel fed into the fuel injection valve 8 is regulated in such a way that the differential pressure between the negative pressure in the intake passage and the fuel pressure is kept constant. Since the fuel injection valve 8 is switched in accordance with the pulse width of the modulated control pulse train Pw ', the amount of fuel injected is changed in accordance with the operating condition of the internal combustion engine YJ and the fuel injection is electronically controlled in such a way that the fuel composition is kept at an optimum value in accordance with the operation of the engine .

The device TU, by means of which the fuel injected from the fuel outlet 8m in the fuel injection valve 8 fuel is given a swirling or is shaken up, as shown in detail in the preferred embodiment has been h and 5 explained in Fig., Can also be a in Fig.6 The training shown can be replaced.

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-Yes--

This vortex device TU ¹ consists of a spiral groove Sl on the circumference of the needle valve 8d, whereby the intermittently injected fuel can be given an inevitable swirl and the atomization of the injected fuel can be improved in a particularly simple manner. Parts corresponding to the design according to FIG. 4 are provided with the same reference numerals in FIG. Even if the fuel injection valve δ is arranged in the inflow channel 9 downstream of the throttle valve 2 in the exemplary embodiments described above, it can also be installed upstream of this throttle valve 2 in the direction of flow.

Another embodiment of a fuel delivery device according to the invention for an internal combustion engine is shown in FIGS. The fuel injection valve has 8 'a valve housing 100 with an upper housing 101 and a lower housing 103 * wherein in the upper Housing an inner space 101 'receives an electromagnetic coil 102, while in the lower part of the lower housing forming Nozzle 103 is inserted.

Above the electromagnetic coil 102 is a wing plate a central core 105 with an axial fuel inlet 1θ4 for Connection with the interior space 101 inserted into the upper housing 101 ', which holds the electromagnetic coil 102 in place while at the same time attaching the coil through ring seals 107 and 108 their inside and their underside is sealed.

In the middle of the end of the nozzle 103 is a fuel outlet 109, which is connected to the interior of this nozzle,

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formed and in the interior of the nozzle is a needle valve 110 for release BEZW. used to close the fuel outlet 109 vertically movable up and down. At the upper end of a plunger 111, an iron member 112 is arranged with a suitable gap to the lower edge of the central core 105, a spring 115 being seated in this gap, which presses the needle valve 110 into the closed position. In the middle of the plunger 111, a slide 114 with a rectangular cross section is arranged and above this slide 114 a flange 115 is formed at right angles to the central axis of the plunger 111. A guide part 116 is provided in the inner wall of the nozzle 103 and a stop ring 117 is provided at the end of the connection between this nozzle 103 and the upper housing 101, through which the opening of the needle valve 110, ie its stroke height, can be controlled by the stop of the flange 115 if the plunger 111 opens the fuel outlet 109 of the needle valve 110. In the middle of the plunger 111 and its iron member 112 connected to it, a fuel channel 118 is provided, through which the fuel flowing into the interior 101 'of the upper housing through the fuel inlet 104 passes into the interior of the nozzle 103. Therefore, when the electromagnetic coil 102 is energized, the needle valve 110 is ^{attracted from its seat 109 f} by the magnet and opens the outlet 109 so that fuel is injected, while when the electromagnetic coil 102 is de-energized, the needle valve 110 is returned to its initial position by the spring II3 is pushed back and closes the outlet 109 and thus switches off the fuel injection. An intermittent fuel supply can be achieved by constantly repeating these processes.

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- -IS-

The fuel injection valve 8 ¹ is equipped with a swirl device TU ″ to give the fuel leaving the outlet 109 a swirl End wall II9 formed, many forms an annular fuel swirl chamber 120 closed by the needle valve 110, with openings 121 and 122 running almost tangentially being formed in this raised end wall II9 so that the fuel flowing to the nozzle 103 in the fuel swirl chamber 120 into a Rotation is offset and swirled, as indicated by the arrows in Fig. &. The opening 121 connects the inlet-side fuel ring chamber 123 with the annular fuel swirl chamber 120, while the opening 122 on the outlet side leads through the nozzle wall to the outside .

The one to be introduced into the fuel injection valve 8 'from the outside As shown in FIG. 7, fuel is fed through a fuel delivery line 127 put into circulation. The line has a fuel pump 124, furthermore a damper 125 * a regulator 126, which is the pulsation in fuel pressure upon ignition attenuates and is connected to the fuel inlet 104 of the fuel injection valve & ', as well as a return line I30 with a flow control valve 128 for regulating the amount of fuel injected and an electromagnetic valve I29 which is connected to an ignition switch to prevent a drop in fuel pressure when the ignition switch is turned on. This return line is connected to the opening 122, whereby they the fuel swirl chamber 120 with a fuel tank

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131 connects. The fuel pumped out of the fuel tank I3I by the fuel pump 124 flows through the damper 125 while its pressure is regulated by the regulator 126. It is then pressed through the fuel inlet line 104- into the fuel injection valve δ ¹ and flows through the channel 11b into the fuel chamber 123 of the nozzle 103, then through the opening 121 into the fuel swirl chamber 120, is swirled in the same and then through the Opening 122 is returned to the fuel tank I3I via the return line I30 after it has passed the throttle valve 12δ and the electromagnetic valve 129 for controlling the line 130.

With this design, the fuel is kept at the required pressure during operation and is fed through the fuel injection valve S 'passed through. Since the fuel in the swirl chamber 120 of the nozzle I03 around the needle valve 110, which the fuel outlet 109 according to the fuel flow When the needle valve 110 opens, the injection valve I03 arrives exiting fuel into the inlet duct of an internal combustion engine as a result of its inertia in the swirling state, whereby the atomization of the fuel is significantly improved.

The slide 114 of the plunger 111 can also be square or any other non-circular in addition to the rectangular one Have cross-section, wherein in each case the plunger 112 can be fixed in the slide 114 in the valve housing 100, so that it can neither be moved nor twisted.

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Instead of the Durohflußsteuerventils 12 &, which is in the reflux line I30 is intended as a control element for the flow rate A suitable opening can also be provided. In addition, the return line I30, which via a throttle valve with the fuel swirl chamber 120 and the electromagnetic valve 129 is connected to the inlet side of the fuel pump are connected in the delivery line 127, this return line 130 can be shortened.

Since the fuel feed device described above for an internal combustion engine according to the invention with a Fuel swirling system is provided, excellent atomization of the intermittently injected power substance and thus an extremely effective fuel injection achieved.

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List of reference symbols:

. Air filter 11. 3015403 1 . . Throttle valve 12th . Inlet pipe (suction pipe) 2. . Inlet pipe 13 - . Vacuum pipe 3. . Air flow meter 14th . Fuel tank 4th . . triangular prism 15th . Branch pipe 4a . . speaker 16. . Fuel return pipe 4b . . microphone 16a, . Control circuit 4c . Inlet air rectifier 17 - l6b, l6c, l6d. . Sensors 5. . Waveshaper circuit 18th . Internal combustion engine 6th . Microcomputers 100. . Exhaust pipe 7th . Fuel injector 101. . Valve body 8th . Il II
• · 101 '. . upper case 8th' . . electromagnetic valve 102. . inner space 8a . . Valve body 103 · . electromagnetic coil 8b . . inner space 104. . Lower case 8b ' . . Plunger 105 · . Fuel inlet 8c . . Needle valve 106. . Central core 8d . . feather 107 . Wing plate 8e . . Fuel injector 109 108. . Ring seals 8f . . Inner channel 109 '. . Fuel outlet 8g It
• · 110 ". .. Seat 8g ' . . Secondary line 111. . Needle valve 8h . . second ring channel 112. . Plunger 8i . . Valve plate 113. . Iron link öj . . Connection channel 114 . feather 8k . . Spiral groove 115. . Slider or slider 81 . . Fuel outlet 116. . flange 8m . . Fuel inlet 117. . Leadership part 8n . . first ring channel 118. . Stop ring 8p . . Inflow channel 119. . Fuel duct 9 . . Fuel regulator 120 . Front wall 10 . . membrane . Ring shape of the 10a . . first chamber 121, Fuel swirl chamber 10b . . second chamber 123. 122 .. openings 10c . . Valve . annular fuel
chamber 1Od 124. . . feather . Fuel pump 1Oe

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125. . mute 126. . Regulator 127. . Fuel delivery line 12b. . Flow control valve 129. . electromagnetic valve 130 . Reflux line 131 . Fuel tank A, B, O, D, E. . connections E. . AC voltage signal P. . Electric Fuel Pump P, P ¹ . . Control impulses ^S in '' Ultrasonic wave ^S out * ^f signal TU, TU ¹ , TU ".. Vortex device.

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Claims (1)

Andrejewski, Honke & Partner, patent attorneys in Essen Patent claims: Iy fuel delivery device for internal combustion engines, characterized by an inlet channel (3), a fuel tank (13; IjSl), a fuel injection valve (8; b ') in the inlet channel for the intermittent injection of fuel from the fuel tank into the inlet channel, one for the fuel Fuel pump (124; P) delivering from the fuel tank into the injection valve, the injection valve having a valve housing (ob; lOO) with a fuel inlet (δη; 1θ4) and a. Fuel outlet (bm; 109) and with an interior (bb ¹ ; 101 ') connecting the inlet to the outlet, in which an electromagnetic coil (8a; 102) and a plunger (be; be; 111) is arranged, which in turn carries at one end a valve body (bd; 110) through which the fuel outlet (8m; 109) can be released or. is closable, wherein a device (TU, TU ¹ , TU ") is also provided, by means of which a swirl can be imparted to the fuel leaving the fuel outlet. 2. Conveying device according to claim 1, characterized in that the Wiroeleinrichtung (TU, TU ") from a on the circumference of the valve body (bd; 110) formed and with the fuel outlet {'cm; 109) intermittently connectable first annular channel (8p; 120) as well as a second annular channel (8i; 123), which is concentric to this on its outside and connected to the interior space (8b ¹ ; 101 '), and at least one channel (8k; 121) which connects the two annular channels to one another. 030044/0860 ORIGINAL INSPECTED Andrejewski, Honke & Partner, patent attorneys in Essen 3 · Conveying device according to claim 2, characterized in that that the center line of the connecting channel (8k) runs tangentially to the first ring channel (8p). Ψ. Conveying device according to claim 2, characterized in that that a return line (I30) is provided which the first Annular channel (120) with the fuel tank (131) and / or with the suction-side fuel delivery line (127) of the fuel delivery pump (12 ^) connects. 5. Conveyor device according to claim 4, characterized in that that in the return line (130) a flow control member (128) and an electromagnetic "valve (129) are provided. 6. Conveyor device according to claim 1, characterized in that the ^{vortex device (TU!} ) Contains a spiral groove (8l 'on the circumference of the valve body (8d). 7. Conveyor device according to claim 1, characterized in that that the valve housing (100) consists of an upper housing (101) and a lower housing (103) and in the upper housing of the Fuel inlet (104), an interior space (101 ') connected to it and an electromagnetic coil seated in this interior space (102) formed respectively. are arranged, while the lower housing held on the upper housing corresponds to the interior space (101 ') having connected fuel outlet (109). 030044/0860 Andrejewski, Honke & Partner, patent attorneys in Essen -JUJL, - &. Conveyor device according to claim 7, characterized in that the interior (101 ') of the upper housing (101) with the interior (101') of the lower housing (10?) Through a channel (118)
is connected in the plunger (111). 9 · Conveyor device according to claim 1, characterized in that the plunger (111) has a right angle to its longitudinal axis
extending flange (115) and a stop (117) is provided by which the lifting height of the valve body (HO) formed on the plunger can be regulated in cooperation with the flange. 10. Conveyor device according to claim 1, characterized in that in some parts of the plunger (111) a part (H ² I-) with a non-circular cross-section at right angles to the sliding direction of the plunger
is shaped and the plunger is mounted in the housing (100) in such a way that it can be displaced without rotation. 11. Conveying device according to claim 1, characterized in that the valve body consists of a needle valve (Hl). J30QU / 0860