Internal-combustion engines – Charge forming device – Fuel injection system
Patent
1982-04-09
1985-03-26
Lall, P. S.
Internal-combustion engines
Charge forming device
Fuel injection system
F02P 508
Patent
active
045066434
DESCRIPTION:
BRIEF SUMMARY
The invention, is based on DOS No. 2,619,443.
In the conventional ignition system, the phase shift of the transducer signal is utilized for a retarded spark setting in order to limit the number of revolutions per minute, rpm, of internal combustion engines to protect the same against overspeeding. This phase shift is produced by the armature reaction in inductive transducers and increases with the armature reaction in case of a rising rpm of the engine due to the thus-increasing load on the transducer. To be able to utilize this phase shift in a controlled fashion, an impedance is additionally connected as a load to the transducer after a predetermined, maximally permissible rpm. Thereby the ignition timing is suddenly retarded by a certain value, the power of the engine drops, and a further increase in rpm rpm is prevented in this way.
It is an object of the invention to further develop the ignition timing adjustment attainable by the phase shift of the transducer signal with relatively simple means for utilization primarily in partially electronic ignition systems with a mechanical centrifugal basic adjustment of the ignition timing and with a likewise mechanical auxiliary adjustment by pneumatically operated advance spark and delayed spark cells, but also in fully electronic ignition systems with predetermined ignition timing values.
It is a further object of the invention to effect the further development such that desired deviations from the basic set values of the ignition timing can be obtained in the entire operating speed range in dependence on various operating parameters besides the rpm.
It is another object of the invention that the advance spark and delayed spark cells, connected with high cost in construction, with the associated control devices be at least partially eliminated.
It is another object of the invention to provide an electronic adjusting device wherein a delayed setting in a multistage or infinitely variable fashion is effected, as well as the restoration of the ignition timing to the basic setting with additional values of operating parameters besides the rpm, to meet the requirement of the engine for spark setting values, deviating from the basic setting under certain conditions, in a simple fashion.
It is another object of the invention to control timing of the signal to the primary of an ignition coil by connecting an impedance as an additional load to a transducer in accordance with a first engine operating primary.
It is another object of the invention to control timing of the signal to the primary of an ignition coil by selectively connecting and disconnecting an impedance in accordance with one of two engine operating parameters.
It is another object of the invention to control timing of the signal to the primary of an ignition coil by selectively connecting and disconnecting an impedance to a transducer in accordance with an engine parameter such as one or more of operating temperature, operating pressure, intake air, supercharger air, exhaust gas, engine vibration, self-ignition characteristic, fuel quality, operating power, the power control members and the transmission ratio as in automotive vehicles.
It is another object of the invention to control the timing of the signal to the primary of an ignition coil by connecting and disconnecting an impedance means to a transducer means by way of a delay means.
These and other objects, features and advantages of the present invention will become more apparent from the following description when taken in connection with the accompanying drawing.
The drawing illustrates several embodiments of the invention and, respectively with the use of diagrams, the associated adjusting functions.
FIG. 1 shows the electrical circuit of a partially electronic ignition system for a 6-cylinder internal combustion engine, shown in part as a block circuit diagram,
FIG. 2 shows the diagram of the ignition timing curve over the number of revolutions of the engine for the circuit of FIG. 1,
FIG. 3 shows the diagram of the additional, temporally co
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Guggenmos Johannes
Holzmann Josef
Krappel Alfred
Bayerische Motoren Werke A.G.
Lall P. S.
Wolfe W. R.
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