Internal-combustion engines – High tension ignition system – Power supply – ignition coil primary – and interrupter element...
Patent
1997-07-07
1998-06-30
Nelli, Raymond A.
Internal-combustion engines
High tension ignition system
Power supply, ignition coil primary, and interrupter element...
F02P 312
Patent
active
057718717
DESCRIPTION:
BRIEF SUMMARY
PRIOR ART
The invention relates to an ignition device for internal combustion engines with a high-voltage switch. From European Patent Disclosure EP 0 377 619, a circuit arrangement is already known which accomplishes the distribution of the ignition voltage with a high-voltage switch. The ignition distributor arrangement makes do without moving parts and involves what is called a stationary high-voltage distribution. For each spark plug to be triggered, one high-voltage switch is disposed between the high-voltage-side end of the secondary winding of an ignition coil and the spark plug. High-voltage break-over diodes, for instance, of the kind known from German Patent Disclosure DE-OS 40 32 131, are used as high-voltage switches. The high-voltage break-over diode comprises many series-connected break-over diodes, or BODs, and the individual break-over diode chips are stacked one above the other in a cascade circuit and subsequently coated on their circumference with a transparent insulator. With such a high-voltage break-over diode, very exact high voltages can be switched. In the prior art, it is usual for the high-voltage break-over diode to be switched by irradiating the p-n junctions with optical energy. The irradiation with light releases charge carriers in the break-over diodes, thus reducing the break-over voltage. The high-voltage break-over diode is assigned a light-emitting diode, which is triggered by the control unit in accordance with the ignition sequence, so that the high voltage is switched purposefully through to the respective spark plug.
ADVANTAGES OF THE INVENTION
The arrangement according to the invention having the characteristics of the main claim has the advantage over the prior art of not requiring a complicated arrangement of a light-emitting diode or a light-transmitting element from the light-emitting diode to the p-n junctions of the high-voltage break-over diode. Hence the design of the ignition device can be achieved substantially less expensively and more simply.
By the provisions recited in the dependent claims, advantageous further features of and improvements to the ignition device defined by the main claim are possible. It is especially advantageous that by means of a trigger pulse of a thyristor connected in series with the high-voltage break-over diode, a conditioning current can flow without requiring optoelectronic components. Another advantage arises from the division of the high-voltage break-over diode into a first part, which comprises individual BOD chips with a long charge carrier storage time, and a second part, which contains BOD chips with a short charge carrier storage time. Thus after the conditioning current is turned off, the break-over voltage during the high-voltage pulse is reduced in the portion of the high-voltage break-over diode having the chips with the long charge carrier storage time, so that the break-over diode effect is preserved by the "overhead" ignition of the second part of the high-voltage break-over diode.
DRAWING
Exemplary embodiments of the invention are shown in the drawing and described in further detail in the ensuing description. FIG. 1 shows a first exemplary embodiment of the invention; FIG. 2 shows a second exemplary embodiment of the invention; FIG. 3 shows a third exemplary embodiment of the invention; FIG. 4 shows the course of voltage in an ignition coil; and FIG. 5 shows the cross section through an individual BOD chip.
DESCRIPTION OF THE EXEMPLARY EMBODIMENTS
FIG. 1 shows the basic design of an ignition device in accordance with a first exemplary embodiment of the invention. The primary winding 10 of an ignition coil 11 is connected to the supply voltage U.sub.B, for instance the battery, not shown, of the engine, and on the other side is connected to ground via a switching transistor 12. The switching transistor 12 is connected to a control unit 13 via a control terminal S1. The high-voltage-side connection of the secondary coil 14 is connected to the spark plugs ZK1 and ZK2, which are connected parallel to on
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Herden Werner
Konrad Johann
Vogel Manfred
Nelli Raymond A.
Robert & Bosch GmbH
Striker Michael J.
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