DE2751457A1 - Self-pumping electromagnetic fuel injection valve - has pump, filter, injector and pressure regulator combined in single housing - Google Patents

Abstract

A piston (14) in the injection valve is moved to-and-fro by an electromagnet (12). At least two non-return valves (20, 26) and an injection nozzle are provided. The magnet is connected by lines (86) with the control electronics which in turn are connected via monitor lines to sensors on the internal combustion engine. In a design variation a non-return valve is provided for the inlet and outlet to the cylinder housing and a non-return throughflow valve in the piston itself. An injection valve is pref. associated with each combustion chamber or all such chambers operate with a single valve.

Description

Self-pumping electromagnetic injector

The invention relates to a self-pumping, electromagnetic injection valve for an internal combustion engine.

In today's Otto engines, the fuel mixture is either via a carburetor or by means of an injection valve to the combustion chamber fed. However, the latter operation is more effective because of the fuel mixture amount is easier to control over the entire engine load range than is the case with the mode of operation with carburetor is possible. In the case of the injection process, there are mechanically controlled ones and electronically controlled processes, the latter being more expensive but more adaptable than the mechanically controlled injection process. Through legislation on The reduction of exhaust gas values and the limitation of fuel consumption are electronic controlled injection processes will probably gain even more importance in the future.

However, all these known injection processes have the disadvantages that they are very expensive and complex and therefore still very expensive. There are here namely, in addition to the actual injection valves, a pump, a filter and a pressure regulator required. The control of the injectors will accomplished by an electronic control, depending on the Motor parameters such as pressure, temperature, speed, etc. are recorded by means of sensors

The same electronic control also controls the performance of the Fuel injection pump controlled as a function of these engine parameters.

The invention is based on the object of creating an injection valve the actual injector, the pump, in an organic unit Filter and pressure regulator combined and thus the previous injection process to improve and simplify and thereby to make cheaper.

According to the invention this is achieved by an in a cylinder of a reciprocating electromagnet and at least two check valves, and an injection nozzle, the electromagnet via control lines with a Control electronics and these on the other hand via sensor lines on the internal combustion engine attached sensors is connected.

Here, therefore, the pump and the injector are advantageously the same combined into a single structural and functional unit that with it naturally also the electronic power control is summarized what a substantial simplification and increase of the functional reliability with all of it resulting benefits.

In an advantageous embodiment or use of the subject matter of the invention it can be provided that one each on both sides of the piston in the cylinder housing check valve for the inlet and for the outlet and in the piston itself also a non-return valve is arranged, or that 3edem combustion chamber each one injection valve is assigned, or that all combustion chambers only one Injection valve is assigned, which is connected to the combustion chambers via a distributor piece communicates.

Exemplary embodiments of the subject matter of the invention are based on the following described in more detail in the accompanying drawings.

The figures show: FIG. 1 the injection valve in an individual view, FIG. 2 the injection valve in a different embodiment, FIG. 3 is a circuit diagram of the Magnetic circuit, FIG. 4 is a functional diagram of the injection valve in the case of multiple injection, 5 shows a functional diagram of the injection valve with a central injection system.

In the Pwnp injector shown in Fig. 1 is one in one Cylinder 10 of a magnet winding 12 reciprocable piston 14 is arranged. The fuel coming from a fuel tank (not shown) is fed through the Inlet port 16, the filter 18 and a check valve 20 into the cylinder space 22 sucked in when the piston moves out of its dashed line position A in its right position B is moved, or with a designed as a magnetic core, Shank 24 made of a magnetizable material in magnet armature 12 is drawn in.

During this suction movement from A to B there is a second, in front of one Injection nozzle 28 ii cylinder arranged check valve 26 closed. if then the piston by switching the magnet 12 to its left position A is moved, the fuel in the cylinder chamber 22 is through the now opening valve 26 and the injection nozzle 28 into the combustion chamber, not shown of the engine is injected with the inlet check valve 20 closed.

In another embodiment shown in FIG. 2, the cylinder housing 55 also have two check valves 52, 54 for the inlet and outlet, the piston However, 56 is also provided with a passage check valve 58 here.

The piston itself consists of a magnetizable material and is surrounded radially by the magnet winding 60.

With an appropriate circuit of the magnet winding 60 (cf.

Fig. 3) the piston is broken through this from its position B to the Drawn position A moves, with the port valve 58 closed and the inlet valve 52 is open, so that from a fuel tank, not shown, through the inlet port 62 and the filter 64 and the inlet valve 52 sucked fuel into the cylinder space will. At the same time, the one on the left side of the cylinder space will be KraftsDff through the opening outlet valve 54 and through the injection nozzle 66 injected into the combustion chamber, not shown, of the engine, the gate valve 58 is closed.

The now following movement of the piston 56 into its right position B back causes the gate check valve 58 to open so that the Fuel in the cylinder space on the right-hand side through valve 58 through and into the left half of the cylinder space is pressed, the outlet check valve 54 now being closed by the suction effect. The injection cycle already described above is now repeated by the Pistons moving from position B to position A are in the left half of the cylinder space located fuel through the opening outlet valve 54 and through the injection nozzle 66 pushes with the gate valve 58 closed; this will be at the same time into the right half of the cylinder space through the opening inlet valve 52 new fuel sucked in. The magnetic flux of the electromagnet 12, 60 is to effect the reciprocating movement of the piston in each case reversed, i.e. the The polarity of the current flowing through the magnet is constantly changing (see Fig. 3).

In the functional diagram shown in Fig. 4 are at certain points of the engine 90 necessary for the determination of the supply and combustion of the fuel to be injected Fuel-relevant parameters (pressure, temperature, speed, etc.) are important are attached, feeler 80. These sensors are connected via sensor lines 82 with a Control electronics 84 in connection; this is also available via control lines 86 with the electromagnets causing the movement of the pump and injection pistons 14, 56 12, 60 in electrical connection. 91 is the fuel tank and 92 is the fuel supply line to the injectors 93.

Fig. 5 shows the functional diagram with central injection in which only a single injection valve 193 is provided for all combustion chambers is, using a manifold 185. Here is therefore also only a single control line 186 from the control electronics 184 to the electromagnet 12, 60 of the injector 193 required.

With the sensors 80 and 180 (see. Fig. 4 and 5) dte air quantities QL is determined at the intake manifold, which in turn is responsible for the correct mixture formation or is important for controlling the amount of fuel QB. With the other sensors 81 and 181, the cooling water temperature Qv is determined, which in turn provides information about the engine status, e.g. about the cold start phase and about the warm operating status.

Claims (4)

Claims: ½) Self-pumping, electromagnetic injection valve for an internal combustion engine, g e k e n n z e i c h -n e t by an in a cylinder (10, 55) reciprocable by an electromagnet (12, 60) Pistons (14, 56) and at least two check valves (20, 26) and an injection nozzle (28, 66), the electromagnet via control lines (86) with control electronics (84) and these on the other hand via sensor lines (82, 83) to the internal combustion engine attached sensors (80, 81) is connected. 2. Injection valve according to claim 1, characterized in that to Both sides of the piston in the cylinder housing (55) each have a check valve (52, 54) for the inlet and for the outlet and in the piston (56) itself also a non-return gate valve (58) is arranged. 3. Injection valve according to claim 1 or 2, characterized in that that an injection valve (93) is assigned to each combustion chamber (FIG. 4). 4. Injection valve according to claim 1 or 2, characterized in that that only one injection valve (193) is assigned to all combustion chambers, which over a distributor piece (185) communicates with the combustion chambers (Fig. 5).