Ignition system for internal combustion engines with a magnet ge

Details Ignition system for internal combustion engines with a magnet ge Ignition system for internal combustion engines with a magnet ge

1986-02-21

1987-09-22

Nelli, Raymond A.

Internal-combustion engines

High tension ignition system

Current or voltage sensing in coil primary

123651, 123418, F02P 312

Patent

active

046948147

DESCRIPTION:

BRIEF SUMMARY
STATE OF THE ART

The invention is based on an ignition system for internal combustion engines with a magnet generator. In an ignition system known from U.S. Pat. No. 4,175,509 a second switch branch for the abrupt adjustment of the time point of ignition is provided in addition to a first switch branch, whereby a control switch of the second switch branch switches-over an ignition switch element at the time point of ignition and is connected with a speed dependent resistance or R-C member for adjusting the so-called time ignition jump speed. With this solution it is disadvantageous that with the second switch branch for the abrupt ignition time adjustment the ignition switch element is no longer completely switched-over into the current conducting state before the ignition time point. Consequently, the primary current is alternated and the primary voltage is simultaneously increased. By means of the increased primary voltage the time point of ignition is preset to advanced ignition. However, such an attenuation of the primary current also results in an undesired attenuation of the ignition voltage. Thus, it is also difficult to optimally match the ignition time adjustment characteristic curve to the requirements both in the idle and also in the power output operational range of the engine.
It is an object of the subject invention to improve an ignition system of the aforementioned type in that the adjustment characteristic curve of the time point of ignition is easier to adapt to the operational requirements of the engine whereby for generating a high ignition voltage, a very low attenuation of the primary current over the entire rotary speed range is obtained.


ADVANTAGES OF THE INVENTION

The ignition system in accordance with the invention is advantageous in that the time point of ignition in the lower speed range is determined by the primary voltage before each ignition, while the time point of ignition in the upper speed range is determined by the primary current. Thus, the ignition system can be dimensioned in a simple manner in such a way that the time point of ignition is preadjusted in the direction of early ignition when a defined so-called ignition time jump speed is reached. A further advantage can be seen in that the time ignition adjustment characteristic curve can be still improved, if need be, by additional measures independently of the lower speed range or the upper speed range.
It is particularly advantageous to form the speed dependent R-C member of the second switch branch from a resistor and a parallel arranged capacitor, so that the resistance value of the R-C member decreases with increasing speed. If such an R-C member forms the branch of the voltage divider being connected with the ignition switching element, the potential at the second control switch is increased with increased speed before the time point of ignition.
It is further advantageous for influencing the adjustment characteristic curve of the time point of ignition in the upper speed range, to connect the control electrode of the second control switch through a further resistor with a point of the primary circuit which is not connected to a measuring resistor. For influencing the adjustment characteristic in the lower speed range a third switch branch for switching over the ignition switch element is connected parallel to the first switch branch, whereby two superimposed characteristic curves can be generated by a corresponding dimensioning of the two switch branches, and the desired ignition time point is obtainable even at low idling speeds.


DRAWING

Two exemplified embodiments of the invention are illustrated in the drawings and are explained in detail in the subsequent description.
FIG. 1 illustrates the ignition system in accordance with the invention,
FIG. 2 the adjustment characteristics curve of the ignition time point of the ignition system and;
FIG. 3 illustrates a control circuit of the ignition system of FIG. 1 being improved with additional measures


DESCRIPTION OF THE EXEMPLIFIED EMBODIMENTS

FIG. 1 il

REFERENCES:
patent: 4174697 (1979-11-01), Podrapsky et al.
patent: 4175509 (1979-11-01), Orova et al.
patent: 4178892 (1979-12-01), Podrapsky et al.
patent: 4244344 (1981-01-01), Werner et al.
patent: 4308848 (1982-01-01), Pfaff et al.
patent: 4512303 (1985-04-01), Watanabe

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