Internal-combustion engines – Charge forming device – Fuel injection system
Patent
1991-08-19
1993-04-20
Okonsky, David A.
Internal-combustion engines
Charge forming device
Fuel injection system
123470, 123468, F02M 5502, F02M 3900
Patent
active
052033040
DESCRIPTION:
BRIEF SUMMARY
STATE OF THE ART
The invention concerns a fuel injection system for internal combustion engines.
In such a fuel injection system, the electromagnetically controlled fuel injection valves are controlled by an electronic control unit as a function of operating parameters of the internal combustion engine, such as induction air quantity, load, temperature, etc., which effect a corresponding metering of the fuel injection quantity. For this purpose, the electrical connections, which are in the form of plug elements protruding from the fuel injection valve housing and which are connected to the electromagnets of the valves, have to be connected to the control unit.
In a known fuel injection system with so-called top-feed injection valves of the type mentioned at the beginning (DE 32 23 556 Al), the electrical contact of the individual fuel injection valves takes place after insertion into the connecting branches of the fuel distributor by means of individual plugs which are pushed onto each fuel injection valve. This implies a substantial effort to fit the fuel distributor to the internal combustion engine because all the plugs have to be pushed on individually after the fuel distributor equipped with the fuel injection valves has been fastened on.
A fuel injection system with a fuel distributor and fuel injection valves of the so-called side-feed type is already known (DE 37 30 571 A1), in which the fuel injection valves are inserted in stepped acceptance holes of a base body, the acceptance holes being open in the axial direction and connected to the distributor duct. The two electrical plug elements per fuel injection valve for connecting the electromagnet to the control unit are located on each fuel injection valve on the end face of the valve housing opposite to the injection mouthpiece and there protrude axially from the valve housing. All the fuel injection valves are, on the one hand, fixed in the acceptance holes by a contact strip in plastic placed on the base body and fastened to it and, on the other hand, are provided with electrical contact, for which purpose the contact strip has a number of integrated electrical plugs corresponding to the number of fuel injection valves. The plugs are individually connected to a connection plug by means of electrical connecting conductors extending in the contact strip; the connection plug is located to the side on the contact strip and the individual fuel injection valves are connected to the control unit by means of this connection plug. This constructional design of the fuel injection system has the double advantage that the fitting time on the internal combustion engine is substantially reduced and that a saving in material costs is achieved because many individual plugs, cables, clamps, etc. become unnecessary. In addition, the basic body and the inserted fuel injection valves, which are provided with electrical contact and are mechanically held by means of the contact strip, form a compact structural unit which permits functional and leak testing and, immediately afterwards, fitting to the induction pipes of the internal combustion engine in a condition unaltered relative to the testing.
ADVANTAGES OF THE INVENTION
The fuel injection system according to the invention has the advantage that even in the case of fuel injection systems with so-called top-feed valves, in which the plug elements protrude to the side of the valve casing because the fuel is supplied at the end, the fuel distributor and fuel injection valves can be combined into a compact structural unit which can be finally tested for function, jet direction and leaks and, after testing, can be fitted immediately and without change relative to the test condition onto the internal combustion engine. The fitting effort on site is therefore substantially less. Because the electrical contacts of the plug elements are made simultaneously on insertion of the fuel injection valves in the fuel distributor, the fuel injection valves are mechanically secured against radial twist. After insertion and test
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Hafner Udo
Reiter Ferdinand
Greigg Edwin E.
Greigg Ronald E.
Moulis Thomas
Okonsky David A.
Robert & Bosch GmbH
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