DE2249235B2 - DEVICE FOR INTERRUPTING THE FUEL SUPPLY OF A COMBUSTION ENGINE - Google Patents

Description

Fuel supply system, which is in a current, however, as a display and control means that the

circle, which is in operation by means of an ignition switch of the internal combustion engine, the lubricant

Ir: The battery can be separated, whereby the io pressure of the lubricant supply system of the combustion

; i machine a fuel metering machine, the negative pressure in the intake manifold of the

y influencing device is arranged in the internal combustion engine (DT-AS 12 91 933) or the current,

^: \ Dependency «on which the intake pipe flows through the generator of the internal combustion engine

Menden air volume from a smallest air volume operating the same emits these means are however not

corresponding starting position is movable and the 15 is suitable with certainty the actual operational

Position of the measuring organ influence on another stand to be marked. The lubricant pressure is

| λ in the circuit depends to a large extent on the viscosity and thus the operating temperature.

characterized in that the measuring element (2) in the temperature of the internal combustion engine and further from that

Starting position a contact (20) and thus when the lubricating oil supply system is in

closed ignition switch (33) a relay current 20 ge and the degree of pollution of this system

circuit between the battery (34) and a relay (27, dependent. It can therefore happen that a

27 ') closes the lack of lubricant pressure under the action of a spring (28) and the internal combustion engine

in the non-excited state and with the closed is still in operation A generator can also

Ignition switch (33) creates a circuit between the Balte- through damage to itself or to its drive

rie (34) and fuel supply system (14, 39) 25 fail and thus also the one serving as a display means

closes electricity. The negative pressure in the suction chamber, on the other hand, is strong

2. Device according to claim 1, characterized by the 3 operation and the state of preservation of the intake that the contact is an insulated, attached, position-dependent and can also be used as a display or the contact spring (20) protruding from the suction pipe (1) serves as a control means failurea is absent in all of these arrangements with a contact piece (19) of the with the mass 30 during the starting of the internal combustion engine and connected measuring element (2) can be connected immediately afterwards, especially in extreme conditions

3. Device according to claim 2, characterized in that the control signal (pressure, voltage) indicates that the relay (27 ') is a second switch of the control means and is an additional transmitter for (45) which has a second display when the relay is energized of engine operation required.
Circuit between the battery (34) and the fuel supply 35 The object of the invention is to create a device for the supply device (14, 39) when the starter switching engine is closed and the fuel supply to a burning second circuit is shut down, which is safer ( 47) keeps closed and without adversely affecting the operating behavior.

4. Apparatus according to claim 2 or 3. thereby at least the internal combustion engine works and simply characterized in that the relay circuit is only to be manufactured after 40 and to be submerged in the internal combustion engine gene is determinable by a time switch (50,52)

Time after the ignition switch (33) has been closed by the invention, the object is achieved

this time switch can be closed that the measuring element has a contact in the starting position

5. Device according to one of the preceding and thus one with the ignition switch closed Claims, characterized in that the measuring 45 relay circuit between the battery and a relay organ (2), protruding into the suction tube, on one around one that does not close under the action of a spring fixed pivot point against a substantially energized state and with the ignition switch closed constant restoring force pivotable lever (8) a circuit between the battery and a power seat and closes in equilibrium with a counter- material supply system

weight (24) is located on the lever (8) and through the 50. This has the advantage that regardless of the

Force of a spring (23) in the absence of air flow in the temperature of the relay circuit already through a

-The starting position is movable, extremely low air movement in the suction pipe, i.e. H. beautiful

6. Device according to one or more of the starting process, by the deflection of the preceding claims, characterized in that the measuring element is interrupted and the fuel gasification as a fuel supply device, a supply device with the ignition switch closed Warm-up device v39) and / or a fuel is supplied with electricity. That way you get a feed pump (14) is used. extremely accurate signal that the internal combustion engine Da in the engine is still in operation

generally only filtered air flows in

60 protect this display device from contamination

The invention relates to a device for interrupting it is therefore also extremely reliable,
chung the fuel supply of an internal combustion engine, in that in an advantageous embodiment of the machine at its standstill, with an independent of the subject matter of the invention as a contact, a drive isolated from the machine and operated by a battery, the contact spring protruding into the intake pipe for the fuel supply system, which is in a ⁶ 5 is used with a contact piece connected to the ground circuit, which can be connected to the connected measuring element by means of an ignition switch, only the battery can be disconnected, with the small structural changes in the intake machine being made by a fuel metering device on an internal combustion engine will,

their fuel metering with hooves of the entrance described Luftmeßorgans takes place

In another advantageous embodiment, the relay is estimated «New second switch that turns on when the relay is energized second circuit between battery and fuel- s supply facility when closed, in this second circuit Hegenden starter switch keeps closed This has the advantage that the fuel supply system can be put into operation immediately after activating the starter, without the The air measuring element needs to be deflected after the starting process has been interrupted when it starts Internal combustion engine has then already set an air flow in the intake duct, so that at The relay circuit is interrupted by the air measuring device and the fuel supply device remains in operation

Another expedient implementation is the Relay circuit only after a time that can be determined by a timer after the ignition switch has been closed can be closed by this time switch. This has the advantage that the fuel supply device is already immediately after switching on the ignition is put into operation, which z. B. with a very hot engine and when the engine is cold this is an advantage. When the engine is very hot, the Fuel supply device removed any gas bubbles that may be present in the fuel supply line and thus a flawless start is guaranteed

Three embodiments of the invention are shown in the drawings and are described above explained in more detail It shows

F i g. 1 a first embodiment of the solution according to the invention,

F i g. 2 the circuit diagram of a second embodiment,

F i g. 3 shows the circuit diagram of a third exemplary embodiment.

In the case of the in FIG. 1 shown fuel injection system the combustion air flows in the direction of the arrow in a section 1 of an intake pipe of an internal combustion engine, in which an (air) metering element 2 is arranged in a conical part 3 of the suction tube, and furthermore through a connecting hose 4 and a suction pipe section 5 to one or more not shown cylinders of the internal combustion engine. The measuring element 2 is transverse to the direction of flow arranged plate, which in the conical part 3 of the suction pipe according to an approximately linear function of the The amount of air flowing through the intake manifold is deflected by this, with a constant value on the measuring element 2 acting restoring force and a constant air pressure prevailing in front of the measuring element 2 The pressure prevailing between the measuring element 2 and the throttle valve also remains constant. SS

The measuring element 2 directly controls a fuel metering valve 7. To transmit the adjustment movement of the measuring element is a lever 8 connected to it, which is as frictionless as possible around a fixed pivot point 9 is movable and when it is pivoted with a nose 10 that is designed as a control slide 11 movable valve part of the metering valve 7 is actuated. The control slide 11 is at its rear side from Pressurized fluid is applied, which serves as a restoring force for the measuring element 2 The metering valve 7 is effected by a fuel pump 14 which is drawn from a storage container 16 via a line 15 Fuel via a line 17 to the metering valve 7

promotes

In the initial position of the suction tube 2 as the narrowest part of the conical suction tube part 3, the lever 8 touches a contact 19 with a narrow contact spring 20 protruding into the suction tube, which is fastened via an insulation piece 21 in the wall of the suction tube 1 in front of the measuring element In this position If there is no air flow, the measuring element is held in all vehicle positions by the force of a very soft spring 23, dLs acting on the lever 8 beyond the pivot point 9. So that the measuring element can be moved with as little loss as possible, it is in indifferent equilibrium with respect to its pivot point, which is achieved by a counterweight 24 attached to the lever 8 on the other side of the pivot point 9.

From the contact spring 20, a power line 26 leads to a relay 27, which is one of a spring 28 in Closing direction acted upon switch 29 contains the power line 26 leads in the relay to a magnet winding 30, which via an actuator 31 when energized the switch 29 opens. The magnet winding 30 is at the other end via a line 32 in which a Ignition switch 33 is connected to the positive terminal of a battery 34. From line 32 between ignition switch and relay also branches off a power line 35, which leads to the fuel pump 14 via the switch 29 is connected in parallel via a further line 36 to the negative pole of the battery 34 or to ground to the fuel pump 14 is through a line 37 branching off from the line 35 and one from the line 36 Branch line 38 connected to a warm-up device 39 of the internal combustion engine. This warm-up device 39, for example, as shown in FIG. 1 shown from a warm-up control device 40 and a parallel-connected heating nozzle arrangement 41, which is via a timer 42 from the power supply can be switched off.

When the air measuring element 2 is in its initial position, as shown in FIG. 1 shows the relay circuit by touching the contact spring 20 with the contact 19, the conductive connection via the lever 8 and an outgoing line 43 to ground from pivot point 9 has closed. Thereby the magnet winding 30 of the relay energized and the switch 29 opened so that the power supply to the fuel pump 14 and to Warm-up device 39 is interrupted. When the measuring element 2 by the air flow in the suction pipe 1 is deflected from its starting position, the relay circuit is interrupted and the switch 29 closed by the force of the spring 28, so that when the ignition switch 33 is closed, the fuel pump 14 and the warming device 39 can be supplied with power from the battery 34.

F i g. Figure 2 shows another type of circuit for the relay and fuel pump circuit. The ones with them after F i g. 1 matching circuit elements are denoted by the same numbers The relay circuit consists here as well as in FIG. 1 from a line leading away from the positive pole of the battery 34 32, in which the ignition switch 33 is located. The line 32 leads to the magnet winding 30 of a relay 27 'and from this via the line 26 and via the switch formed by the air measuring element 2 and lever 8 and the line 43 to Negative pole of battery 34 or to ground. As in Fig. 1 branches from the line 32 between Ignition switch 33 and the relay 27 'from a line 35 which leads to the switch 29 of the relay and from this to Pump 14, which is connected via line 36 to the negative pole of the

Battery 34 is connected Parallel to the switch 29 at the relay 27 ″, a second switch 45 is arranged, which can be switched at the same time by the actuator 31 or by the spring 28 with the switch 29. The switch 45 is connected to the line 32 between the battery s

34 and the ignition switch 33 via a line 46 in which a starter switch 47 is connected. On the other hand, a line 48 leads from switch 45 to the line

35 and thus to the fuel pump 14 or to the warm-up device 39. to

When the ignition switch 33 is closed and the air measuring element is in the initial position, the relay circuit is 32,33,30,26,8,43 and 34 closed. Through the Coil 30 then flows current, whereby the switches 29 and 45 middle of the actuator 31 moves upwards , whereby the power connection from the line 32 via the line 35 to the fuel pump 14 through the switch 29 is interrupted, but one Connection between line 32 via line 46 and switch 45 and line 48 to Fuel pump is manufactured; However, this only when the starter switch 47 is closed.

With the help of this device, the fuel pump 14 and the Warming device 39 are put into operation. On the other hand, this only works if the ignition switch 33 is closed, i.e. the relay 27 'is energized

In this arrangement as well as in the arrangement according to FIG. 1 ensures that if the Ignition switch is open, all fuel supply systems are switched off.

In Fig. 3, a further embodiment of the invention is shown in the circuit diagram. Here, the line 32 leads from the positive pole of the battery 34 via the ignition switch 33 and a line 49, in which a timer 50 is located, to the coil 30 in the relay 27. In turn, the line 26 leads from the relay the switch formed from the air measuring element 2 and lever 8 and a line 43 to the negative pole of the battery 34 or to ground. From line 49, line 35 branches off and leads to switch 29 of relay 27 and from there to fuel pump 14 or to Warmlaufein unit 39, which in turn are both connected via line 36 to the negative pole of battery 34 and to ground are. Between the ignition switch 33 and the switch 29, a power line 51 branches off from the line 35, which has a heating winding 52 for the bimetal time switch 50 and is connected to the negative pole of the battery 34 via the line 43

When the internal combustion engine is started up, the ignition switch 33 is closed; Connection from the line 26 to the line 43 via the lever: 8 of the air measuring element 2 at a standstill Internal combustion engine manufactured. Nevertheless, the relay circuit through switch 50 initially remains interrupted, so that the switch 29 is closed by the tension spring 28 and the switch via the line 32 33 and the line 35 the power connection to the fuel pump 14 and to the warm-up unit 39 The internal combustion engine is thus immediately supplied with fuel and can be used without difficulty to be started. After the start, the relay circuit is also affected by the deflection of the air measuring element 2 interrupted. Immediately after closing the ignition switch, however, the heating coil is 52 of the bimetal timer switch 50 is supplied with power, whereby the switch 50 after a is closed for a certain adjustable time. If now the internal combustion engine comes to a standstill again should come and the connection between line 26 and 43 by means of the lever 8 of the air measuring element is closed, the entire relay circuit is closed, the magnet winding 30 energized and the switch 29 opened In this case, the power supply to the fuel pump i4 and the .Warmlaufeinrichtung 33 interrupted according to the task.

With the above arrangements, the fuel supply of the internal combustion engines is with certainty Standstill of the internal combustion engine and interrupted when the ignition is switched off. By using the very sensitively reacting Luftmeßorganans, which at the same time the fuel metering of the internal combustion engine controls, the reliable effectiveness of the arrangement is guaranteed. The above-described Realize the solution through simple means without adversely affecting the operation of the engine. this occurs in particular by the bridging device according to FIGS. 2 and 3, which otherwise also can be combined with each other. Furthermore, it is advantageous that the relay 27, 27 'only in the few Cases can be live in which the measuring element 2 is in its initial position has a beneficial effect on the service life of the relay. This arrangement can of course also be used analogously transfer other fuel measuring devices equipped with movable air measuring elements a

For this purpose 2 sheets of drawings

Claims (1)

ι- * λ flowing measuring element is arranged, which depends on Claims: ability of the air flowing through the intake pipe amount from a minimal amount of air % 1. Device for interrupting the initial fuel position is movable, and the position of the Supply of an internal combustion engine at its] 5 measuring element. Influence on another in the circuit g has a standstill with a switch that is independent of the machine # Do I have a battery powered drive for which such devices are known to be used