DE2063240C3 - Fuel injection system - Google Patents

Description

2. Fuel injection system according to claim 1, pressure fluctuations of the flow to the injection nozzles thereby marked, .that the fuel pressure ao ßenden fuel are compensated.

by means of a pressure control device (40), it is also from the magazine "MTZ".

borrowed, depending on the one known in an air 1967. pp. IO to 12., the pressure before the collector (59) to keep the suction line prevailing spray valves constant, so that the combustion pressure is controllable. Metering of substance quantities over the opening times of the

3. Fuel injection system according to claim 2, 25 solenoid valves takes place, slow changes in the characterized by means (44, 45, specific gravity of the surrounding the engine 65), which is controlled by the suction line pressure, atmospheric outside air via a regulator Opressure and the temperature of the atmospheric changes in the pressure level in the power tank Air responds to compensate for the pressure of the train- substance manifold. Such a one led fuel., to \ a./ieren. 30 Entering correct errors via the fuel

4. Fuel injection system according to claim 2 pressure is also provided according to the magazine "Funk-Tcch- or 3, characterized by a valve device", No. 23/1963 p. 862 to 864, where device (41), to a fuel distribution pipe is closed to changes in air pressure and air temperature in order to allow the passage of pressurized fuel to be compensated for by changes in fuel pressure from a fuel distribution line, which is to have a constant value line back to a fuel tank as the country ^ e of the pulse for a control, through a membrane device (45), the solenoid valve should be the only variable influencing the amount of fuel per pin on the intake line (59) of the machine intake cycle,
is closed and by a linkage (46) for the Finally it is from the magazine "MTZ", 1967, Transmission of the movement of the membrane device 40 p. 481, known that by increasing the fuel on the valve device to control the pressure during the Start of a gasoline engine the fuel passage through the valve device Hot start at all occurring outside temperatures depending on the intake line pressure. ren can be safely controlled.

5. Fuel injection system according to claim 4, in the previously known fuel injection system, characterized in that for an additional 45 men, the pressure of the fuel injected into the fuel-sensing the pressure and the temperature of the at- injection valves is a bellows (65) with the ge - Chen held constant while the control of the rod (46) is in communication. amount of fuel supplied in electronically controlled fuel injection systems by changing

The width of the electrical pulses applied to the solenoid operated fuel injectors is typically a function of engine power to vary the length of time that the fuel injector is held open. Under heavy load conditions, the pulse width is made larger in order to deliver a higher amount of fuel to the cylinders, while at low load the pulse width is reduced. The invention relates to a fuel injection.

injection system for a multi-cylinder internal combustion engine This type of fuel injection prepares each

machine, an electromagnetically but difficulties associated with the generation of a Irnpul- actuated injection valve in each cylinder 60, which is opened by ses having a pulse width, the speed-synchronous high mechanical rectangular pulses speeds and / or heavy Maschinenbclastungen and the fuel by means of a machine transmission is optimal in all machine operating cycles , since the fuel pump is supplied under a pressure, duration of each machine cycle under these conditions, which is very small with the increase of a certain machine cycle; the period of time is, for example, when the size of the company increases. a speed of 6000 rpm in the range of

With a value of 10 ms in the German interpretation. At low machine load 290 372 described system of this type, the and / or at low machine speed it is

³ 4

^{? 8 <n S} l ^r J * ^ei R ^h rl: ⁿ A, W * μ ^ore * ^u ß ^s · a For additional detecting the pressure and the

has a reasonable width, since when the machine is operated with the temperature of the atmospheric air, it is advantageous

", Speed limits a relatively long cycle-dependent a bellows in connection with the linkage,

node is present. If the machine works with high speed, the invention is illustrated below with reference to

dizziness under heavy load, consists of the ₅ exemplary embodiments with reference to the

Danger that de pulse width of the E. injection drawing explained in more detail.

Valves applied Impulss.gnais under the required F i g. 1 schematically shows the overall structure of a

the value drops, so that there is a decrease in the fuel injection system according to the invention;

Machine performance or a stall of the machine Fig. 2 is a graphical representation of the force

^he SJ ^bt · _ _. ,. ,. _Λ , * ° Stock feed pressures depending on the engine

The invention has the object of providing a speed in a system according to Fig.l, wherein

Fuel injection system of the type mentioned above, the individual curves different engine intake

indicate that it represents a reliable and accurate control line negative pressure;

tion of the force supplied in each Emspntz cycle F i g. 3 is a graph showing the menu

Amount of fuel, especially at higher speeds, depending on the amount of fuel injected

and boher load enabled. the engine speed in the system

According to the invention, this task is achieved by _B c- Fig.! clarifies, with the injector for fine

solves that the duration of the square-wave pulses is kept open by means of a fixed period of time and the

a pulse width calculator circuit.g individual curves controlled in this way different engine intake line

vvird that they represent inversely to the masc ^{1 in the} number 20 suppresses;

changes and that the particular Mascninenbetriebs- Fi g. 4 is a block diagram of an electronic

size is the machine speed. Control unit, as it is the force according to the invention

This association between duration of the on sto ^f is fine spray system incorporated according to Fig. 1;

fuel / pulses and pressure of the injection valves Fig. 5 is a circuit diagram of a pulse width calculator

supplied fuel in the opposite dependent J ₅ nerschaltung after the electronic control unit

The speed of the machine is advantageous. Fi ".4;

Fig. 6, to be injected in each duty cycle, shows the voltage waveforms which maintain a 1 amount of fuel substantially independent of various points in the pulse width calculator speed, the manner of controlling the circuit of Fig. 5;
Duration of the square-wave pulses in adaptation to FIG. 7 is a graphical representation of the pulse engine speed - namely corresponding to the width as a function of the engine speed through the duty cycle for the injection;

limited period - takes place, whereby a F i g. 8 is a graph of the force

simple control is achieved. amount of substance, as it is with variable engine

Fuel metering by means of variable speeds is required;

Injection pressure is also after the older, not before- Fig. 9 is a graphical representation of the

published German patent application fuel quantity, as it is with different

P 18 07 773.1 provided, according to which the valve opening suction pressure is required.

However, the operating time should remain constant. Subject In Fig. I is a fuel injection system for

This earlier application shows a four-cylinder internal combustion engine due to the throttle 40. One

flap adjustment controllable pressure relief valve to the pump 11 delivers fuel and pressure from one

Upstream fuel pressure control. Fuel tank 12 through a filter 13 and an inlet

According to an advantageous embodiment of the return check valve 14 for a fuel distributor

Finding is in addition to the dependency of the fuel distribution line 15. The fuel distribution line If

45 has four branch lines 16 to 19 that lead to the nozzle

additionally depending on the lead in an air of the respective machine cylinder. In the preliminary

collector of the suction line prevailing pressure with the case is the. Nozzle 20 in a suction line

means of a pressure control device provided. A branch duct 21; of course the nozzle can

even more precise control of the in each injection cycle can also be arranged so that it is immediately ir

The quantity of fuel supplied results from 50 the inlet opening of the intake line / branch channel;

a device for varying the pressure of the train 21 cinspritzf the intake line branch duct 21 open-

led fuel, which on the intake line pressure, net in the engine cylinder 22, as shown

the atmospheric pressure and the temperature of the homely via an inlet valve 23. The nozzle 20 forms

atmospheric air. dct part of a control valve 24, which with the help of "

In a further development of the invention, a device is controlled, which has a control device for controlling the pressure of the supplied energy supply 25, an electronic fuel as a function of the intake line control unit 26, a distributor 27 and a machine pressure valve device, which has a trigger device 28 driven by a fuel. Around the passage of the valve 24 there is a solenoid which, with pressurized fuel from a fuel 60, a line 30 to the control device is connected back to a fuel distribution line. The nozzle 20 sprays fuel into the tank to control a diaphragm device, the air entering the engine cylinder 22 when the engine's suction line is connected, and lenoid remains energized by the control device,
a linkage for the transmission of the movement of the air filter 31 is to a throttle valve membrane device) <; coupled to the valve device to 65 32, in which a throttle valve 33 is seated. There; Control of the passage of fuel through the valve throttle valve 33 is connected to an accelerator pedal (device not shown as a function of the intake line, in order to control the pressure to be supplied to the cylinder 22 at the rcndc air rate.

5 6

Between the air filter 31 and the throttle chamber and in the pressure of the vent 67

mcr 32 is atmospheric air entering downstream of the throttle valve. This expan-

33 a secondary air duct 34 which, when starting and opening and contracting the bellows 67, leads to

when the machine starts, additional air to the cy- that the rod 64 advances or retreats, and

linder 22 delivers. The Luftnehenkanal 34 is with 5 as a function of the atmospheric pressure

a valve 35 is provided, the air passage and the temperature. A spring link 68 is provided for

through the secondary channel 34 controls. See the valve 35 that the Winkclarm 62 counterclockwise

is controlled by a thermostat 37, which according to FIG. 1 stressed around pivot point 63,

The lever 60 is in its middle section on

cooling water determined. i ° the piston rod 48 of the control valve 41 is connected

It is a force, generally designated 40, so that the changes in the intake fluid pressure device provided, the cine reverse pressure, in atmospheric pressure and in gulicreinhcit 41 with three chambers at a distance, the temperature-induced movement of the Hemern 42 and 43, a membrane unit 45 and a valve plate 60, the relative position of the piston 47 varies, mechanical linkage 46, which zwiten the unit 15 whereby the effective cross-section of the connection 4t and 45 are operationally linked. In see the inlet port 49 and the outlet port the chamber 42 of the pressure regulating unit 41 is seated 50 of the chamber 42 is varied, slidable a piston or a valve slide 47. The machine works with light loads and The piston 47 is fixed with a piston rod 48 partially open throttle valve, i. H. under one connected, which in turn was operationally connected to the boom ao, in which only a limited amount of air in 46 is connected. In the chamber 42 is the cylinder is sucked, develops in the suction line with the fuel distribution line 15 connecting line collector 59 a greater negative pressure, the dene inlet port 49 and an outlet port 50, the membrane 53 in Fi g. 1 moves up and which lies opposite the inlet opening 49 and with which the piston rod 48 of the KoI chamber 43 is connected. The other chamber 42 25 hens 47 disengages. This movement of the piston rod the pressure regulating unit is via a channel 44 48 is connected with upward movement of the piston 47 the chamber 43 in connection. This channel 44 tied so that the effective connection crossover A line is connected to the air filter 31 between the inlet opening 49 and the outlet, so that in these chambers 42 and 44 a vent opening 50 is enlarged and a larger one sets substantial atmospheric pressure. Bcfin- 30 amount of fuel through the chamber 42 into the det the piston 47 in the position shown, chamber 43 can flow. The one in the fuel cond. H. in a position in which the inlet port 49 with dividing line 15 is the prevailing fuel pressure the outlet port 50 communicates, so flows reduced in this way. In heavy-duty operation at the fuel at a certain rate from the fully open throttle valve becomes the diaphragm 53 Distribution pipe 15 via chamber 42 into chamber 35 in working contact with stop member 52 β abmer 43. The chamber 43 stores the inward flow pressure, so that the piston rod 48 through the fuel, which is brought into a position by means of a mechanical rod 46 in which Pump (not shown) through a filter 51 for the effective connection between the Fuel tank 12 is returned. openings 49 and 50 is reduced so that only

The membrane unit 45 has a housing 52, 40 Hch a limited amount of fuel into the chamber

a membrane attached to this housing 53. a 43 can go, whereby in the fuel distribution

Actuating rod 54 and a spring device, the line 15 a relatively high pressure is built up,

In the present case, two different compression springs. In FIG. 2, the fuel pressure P in is shown graphically

55 and 56, which are placed in a chamber 57 below the distribution line against the engine, which is limited by the housing 52 and the 45 speed N in the fuel pressure control device-Mcmbran 53. The compression springs 55 and 40 are carried, with the different ^ τ Kur-

56 tension the diaphragm 53 in the direction of a different intake line negative pressure rc stop member 52 a before. which present part of the housing 52.

can form. The two springs 55 and 56 have different spring rates for the pump 11, which is used to deliver fuel, for a reason to be discussed below under pressure to the check valve 14. A negative pressure can be driven by the machine 10 in a connection between the machine speed 57 of the membrane unit 45 and an air flow rate which is substantially proportional to the speed of the machine. The pump 11 is the pre-collector 59 of the suction line. The to the Mem-zugweise a positive displacement pump, z. B. a toothed gear 53 connected actuating rod 54 is connected to 55 wheel pump, a trochoid pump, an impeller of its leading end to one end of a lever pump or a speed pump, the pre-60, which has a part of the mechanical preferably a capacity that around the two to linkage 46 forms. At the other end, four times larger than the maximum fuel vane 60, a connector pin 61 is attached. It is a need. If a pump of the aforesaid type angle arm 62 is provided, which is used pivotably on a 60, the fuel supply pressure P rises in the pin 61 which engages the pin 61 and which is pivotable about a stationary pivot point 63 proportional to the square of the machine wheel. The angle arm 62 speed, as shown in FIG. 2 is shown. In 64 reasonable Fig. 2 is at its other end to a rod _Α λ represents a fuel pressure when closed, which is connected to a bellows 65th Full throttle, A, a fuel pressure at -200 mm Hg bellows 65 is located in a housing 66 with an intake manifold 65 and a fuel vent 67 A _3. The bellows is with a gas, for example with pressure at -400 mim Hg suction line negative pressure. Air is filled under pressure and expands and contra- Since the effective opening cross-section of the connec- ted depending on changes in the temper- ature between the inlet opening 49 and the outlet

7 8

orifice 50 with increasing intake manifold signals generated two electrical impulses,

pressure increases, the higher the negative pressure, the result is that the pulse is transmitted through lines 76 and 77 for

pressure in the intake line of the engine a nicdri- fuel injection to the solenoid-operated

Lower fuel pressure in the fuel distribution line injection valve 24 out. The line 76 is to the

15. 5 one assigned to the first and third cylinder

Dic F ι g. 3 illustrates the injected power injection valves and the line 77 to the second

Amount of substance Q compared to the injection valves assigned to the machine speed and the fourth cylinder

speed N, the different curves being different- connected, so that the fuel injection

represent borrowed intake line negative pressures. The same for the first and third cylinder and

Values Q are those values that were measured io subsequently for the second and fourth cylinders

if the pulse width and, accordingly, the opening follows. The electrical impulse goes through alternately

operating time of the nozzle 20 are kept constant, d. H. lines 76 and 77 to injection valve 24.

for example at 5 ms. From Fig. 3 you can see. In Fig. 4 is a block diagram of the electronic

that the injected fuel quantity Q is shown linearly with the control unit 26. The one from the machine

the increase in the machine speed N 15 driven trigger device 28, the dashed

grows. This results from the fact that it is outlined. has a cam 80 on a

injected fuel quantity Q is proportional to the square divider shaft 81, which is connected to half the crankshaft

The root of the fuel pressure / 'increases, the revolving speed. Two moving cons

That is proportional to the square of the machine contacts 82 and 83 are connected to swivel contacts 84 and 85, respectively

speed is N. ao attached, which are connected to the ground and

According to FIG. 1 can oscillate at the electrical cogs 80 with each cam rotation. The electronic control-one-way contacts 82 and 83 connected to the water supply 25 receive stationary constants 26 numerous signals which are assigned to the clocks 86 and 87, respectively, which indicate the mechanical drive states via resistors, e.g. B. the machine 89 or 90 to an electrical energy source, z. B. ncnpcschpeed. the crankshaft circulation valve, a battery 88 are connected. The two sets of the throttle valve position and the cooling water temperature of contacts 82 and 86, 83 and 87 can be used at jcpcratur. The trigger device driven by the machine and opened in the rotation of the cam 80 and the gcdcm distributor 27 housed are closed. The stationary contacts 86 and 28 generates a pulse signal which indicates both the machines 87 are connected to a pulse width calculator circuit 91 and the crankshaft 30 via lines 92 and 93, respectively. The signal that the pulse width calculator circuit 91 received at the rate! of two impulses for each machine operation / v- the machine speed indicating signal, klus appears, the signal indicating the crankshaft setting is alternately carried over the lines in front of 70 and 71 to the electronic control device of the machine-driven trigger device 28 26 and is used to discriminate the ignition - >:, and the signal indicating the cooling water temperature follows in the engine 10. Another, the throttle valve from the cooling water temperature sensor 74. On the position representing signal is determined by a basis of these signals, the circuit 91 generates a throttle valve position detector 72, which has the correct pulse width and generates a pulse soldcm throttle valve 33 is connected; this signal rather wide at a rate of two pulses for i is sent via a line 73 to the electronic 40 every revolution of the machine operation. The impulse control device 26 is used to alternately block the injection in fuel or the richness of the pulse-intensive 94 and 95 during freewheeling heights. The mixture is enriched in that and 97 to solenoid devices 98 and 99, which the electronic control device 26 causes 45 associated with the injectors 100 and 101 , actuate an additional pulse or a pulse tile. The nozzles 100 and 101 are given a larger width to the solenoid-operated valve by energizing the solenoids 98 and 99, respectively, and thereby increasing the injection duration, once for each engine turn. drive cycle to effect injection.

The cooling water tempering is sensed by a guide 50 The electronic control unit 26 has a Be-Icr 74, which has a temperature-sensitive acceleration circuit 102 and a fuel lock, which is located in the cooling water toe circuit 103 in addition to the aforementioned circuitry. The temperature of the cooling water can vary. The output of the accelerator circuit, the temperature of the cooling oil, the exhaust gases or the 102 , can be approximated via lines 104 rad 105 to the injecting machine block if necessary. 55 pulse amplifier 94 or 95 connected, so that the signal indicating the cooling water temperature upon delivery of the belching signal from the: is fed via a line 75 to the electronic throttle valve position detector 72 at the acceleration control unit 26, in order to allow a throttle valve 33 open to the mixture to effect when starting and warming up. The pulse amplifiers 94 and 95 the width of the fuel mixture enrichment pulse is achieved by adding or increasing the solenoid operated valve 24 to the solenoid operated valve 24, or they are fed 91 to the solenoid devices 98 and 99 by the pulse width control circuit Add an additional pulse to d "borrowed pulse or a pulse width larger Toggle solenoid means 98 and 99 to the insert. Since in the embodiment described, injection dates for acceleration enrichment to a system with simultaneous injection in two 65 heights. The output of the cylinder fuel lock circuit is generated, the electronic 103 is connected via lines 106 and 107 to the pulse control unit 26 for each Maschmenbetriebszyklos width amplifier 94 and 5S. This is dependent on the circuit 103 described above with its input via conductors

ίο

108 and 109 η η die maschinengctricbeir Triggcr-Schiilliing 28 connected and receiving cm signal, which indicates the machine speed; furthermore, the circuit is connected to the throttle valve via a line 110 \ cntilstcIhiiiEsdctcktor 72 connected, do a those To receive a signal indicating the throttle valve position. [Reaches the engine speed while Freewheel a certain value and the throttle valve 33 is in an idle position, makes the fuel cutoff circuit 103 amplifies the fuel injection pulse 94 and 95 only close the nozzles 100 and 101 and thereby the fuel supply to stop each cylinder.

Fig. 5 shows a circuit diagram of the pulse width calculator circuit 91, which forms the main part of the electronic control unit 26 of FIG. To the Simplification of the representation is in Fi g ^ a Half of the entire circuit is shown showing a pulse to be applied to the injection pulse amplifier 94 generated. The stationary contact 86 is connected to the base of a transistor 111, the Emitter is directly connected to ground. The base of the transistor 111 is on via a resistor 112 a bus line 113 is connected, which leads to a battery 88. The collector of transistor 111 is connected to a charging circuit 114 which includes an oil rectifier 115, a resistor 116 and has a capacitor 117, all between the Bus line 113 and ground are connected in series. At a point 118 between the resistor 116 and the capacitor 117, the base of a transistor 119 is connected, the emitter 120 is connected to ground via a resistor 121. The emitter 120 is in place via a capacitor 123 122 connected between the rectifier 115 and the resistor 116. The collector of the transistor 119 is directly connected to the collecting line 113. The charging circuit 114 and the transistor 119 form a sawtooth wave generator 124.

The output of the sawtooth wave generator 124 is connected to the input of a Schmidt circuit 125, which has two transistors 126 and 127. At the input of the Schmidt circuit 125 is furthermore, the output of the cooling water temperature sensor 74 is connected. The base of transistor 126 is connected via a resistor 128 to the bus line 113 and via a resistor 129 to ground. The collector of the transistor 126 is connected to the bus 113 via a resistor 130 and via a parallel connection of a capacitor 131 and a resistor 132 with the Base of transistor 127 connected. The emitters of the two transistors 126 and 127 are common connected to ground via a resistor 133. The transistor 127 is connected to its collector via a Resistor 134 is connected to the bus and also to the injection pulse amplifier 94.

The mode of operation of the pulse width calculator circuit 91 is shown in FIG. 6. The illustrations (a) and (b) show the square wave voltages as they appear at the points X and ~ K , which lead to the stationary contacts 86 and 87, respectively. If the contacts 82 and 86 are closed by the action of the cam 80, the voltage at X goes to zero, so that the transistor 111 is blocked. At this moment, the capacitor 117 begins to charge, and at the same time the voltage at the K point leading to the F.mitter 120 of the transistor 119 begins to rise, as shown in (c) of the I · "i g. (I If the contacts 82 and 86 are then opened by the cam 80, the transistor 111 becomes conductive, so that the transistor 119 is blocked and the voltage at the point Y is thereby reduced to zero.

The Schmidt circuit 125 compares the input voltage with a certain reference span-ηιιημ. as shown in (d) of FIG. If the input voltage is built up on this reference voltage, the transistor 126 is conductive, whereby the 'transistor 127 becomes non-conductive. Thus appears on the collector of transistor 127 a pulse, dcssen llreitc is equal to the duration. in which the impulse clamping is higher than the predetermined reference voltage. as shown at (e) in Fig. ft. Increases the Machine speed. the number of square wave pulses increases. those for a particular

ao time appear at the points X vMkI Ύ , so that there is a certain reduction in the pulse width. It follows that the width of the pulse received at the collector of the transistor 127 decreases with increasing machine speed, as in

(e) of FIG. 6 and also in FIG. 7 is illustrated. The signal, which indicates the cooling water temperature, is applied to the input of the Schmidt circuit 125, to increase the pulse width when starting and warming up for mixture enrichment.

The F i g. 8 shows the ranges of the required fuel injection quantity Q _x versus the engine speed / V, the ranges shown in relation to an increase in the engine output power at full throttle and a reduction in the engine speed.

Substance consumption and the amount of unburned exhaust gas components are determined at partial load. Such Areas can also be specified in other ways for other purposes. The relationship between the amount of fuel injected and

the machine speed may be in the ranges ß ,, B., and B. _t fall, the full throttle - corresponding to 400 mm Hg Ansaugleitungsunterdruck - 200 mm Hg and. Despite changes in the machine speed, these areas remain essentially unchanged.

changes, but take the form of curved strips around the middle of the whole speed range are convexly curved.

As previously described and shown in FIG. 3, the amount of fuel injected is Q at

Injector held open for a certain period of time is essentially proportional to engine speed / V. However, as one can see from the solid line c in FIG. 7, the pulse width applied to the solenoid operated valve drops

reversed proportionally with an increase in the machine speed. Thus, the amount Q ₁ of fuel injected for each cycle of engine operation remains essentially unchanged despite changes in engine speed,

fio as indicated in FIG. 8 by the thin lines C ₁ , c, and C _3. If the pulse width falls linearly with increasing machine speed, as indicated in FIG intake manifold counter pressure injected at each cycle of engine operation at full throttle, -200 mm Hg, and -400 mm Hg; Amount of fuel the thick lines </ ,, d. ₂ and d _a in Fig. 8. The lines

Ii

(,. <-.,. t. ,, df. d, and r /. _t fall into the ranges /? ,, / J, and / λ, η act- I · i μ. H, which for different brokerages can be calculated.

F i μ. ^l ) / shows the areas required ·! Kral'tsiaffeinsprit / mengc Q, depending on the Ansaiigleiliingsuiilcrdruck / '. The line between the amount Q ₁ of injected fuel and (! Cm Ansaiiglcitiiiigsunlcrdruck / 'can slur into the hatched area, which / between the upper and lower (irency line <:, or <*., Delimited / .t To increase the output power at full throttle and to reduce fuel consumption and the amount of unburned exhaust gas components at part load, the air / fuel mixture should be enriched at full load and made leaner at part load, as explained above. that the amount of injected fuel drops abruptly at the Apiaugleitungsunterdruckabfall of I / 'according to Fig. 9. This can be achieved by using the two springs 55 and 56, which have different spring constants and 56 only the less stiff spring; when the suction line depression reaches point AP , it is not only the two springs that act on the diaphragm 53. Although d The injected fuel quantity can be adjusted as a function of changes in the atmospheric pressure and the temperature of the atmospheric air (or the intake air) by using an atmospheric pressure sensor and an intake air temperature sensor, the outputs of which are applied to the electronic control unit 26 for controlling the pulse width
65 use; to adjust the fuel pressure as a function of changes in the atmospheric pressure and the temperature of the atmospheric air. If the atmospheric pressure or atmospheric pressure is relatively low and the atmospheric pressure relatively high, the the bellows 65 unge sehlosscnc rod 64 held in its protruding position, so that the piston rod 48 be upwards

ίο away and the effective () opening section of Ver connection between the inlet port 49 and de: Outlet opening 50 is enlarged so that the Ünicl in the fuel distribution line 15 enCprcchenc falls off. Conversely, if the atmospheric pressure is relatively high and the atmospheric temperature is relatively low, there is a relatively high fuel pressure in line 15.

If it is not desired, the fuel delivery pressure as a function of the atmospheric pressure

ren iu STCU to and from the atmospheric temperature, the operation rod 54 can directly be connected to the piston rod ar 48th

Instead of the membrane unit 45 with the two springs 55 and 56, a bellows can be used in which a near negative pressure develops. In the scm case, the bellows is connected to the suction device ler 59 and is connected by the absolniei ' Pressure in this line is controlled, essentially corresponds to the engine loads. Elin such a bellows can simultaneously control the force substance pressure can be controlled in accordance with the atmospheric pressure.

In addition 6 sheets of drawings

Claims (1)

Fuel pressure is regulated to a value that is un Patent claims: a fixed constant amount above that in each case in the intake line of the internal combustion engine! 1. Fuel injection system for a multi-cycle air pressure. This is to avoid a waste Itnder-Brennkraftmaschine.bei each cylinder 5 of the fuel pressure when operating the Brennkraftma an electromagnetically actuated injection valve schute at a great height, which is always assigned, which occurs by speed-synchronous when the fuel pressure from one - Square pulse is opened, and the force pressure regulator by a constant amount above deir substance is held by means of a machine-driven force - respective atmospheric pressure, such as e: fuel pump is supplied under a pressure, io in other known injection systems, for example the one with the increase of a certain machine mode according to the German Auslegeschrift t 231 954 the size of the company is increasing, which is a challenge. Rather, at every height, dei indicates that the duration of the rectangular pressure is applied to the solenoid valves, se impulses by means of a pulse width calculator - that the fuel quantity only through the opening device (91) is controlled in such a way that it is determined by the duration of the solenoid valves reversed to the mass speed changes and that even with a Einspntzvorrü '-' urtg according to the the specific size of the machine operation the German Auslegeschrift 1 100 377 is the burning speed is. material pressure kept essentially constant by