Electricity: electrical systems and devices – Control circuits for electromagnetic devices – Systems for magnetizing – demagnetizing – or controlling the...
Patent
1992-03-25
1994-07-05
Gaffin, Jeffrey A.
Electricity: electrical systems and devices
Control circuits for electromagnetic devices
Systems for magnetizing, demagnetizing, or controlling the...
361143, 361153, 361189, H01H 4700
Patent
active
053273206
DESCRIPTION:
BRIEF SUMMARY
BACKGROUND OF THE INVENTION
The invention relates generally to apparatus for suppression of individual ignition events in an ignition system. An apparatus of this kind is known for instance from German Patent 24 43 403, Knoedler & Blum, assigned to Robert Bosch GmbH. The known circuit arrangement is used in ignition systems that have an ignition coil and an interruptor switch disposed in the primary circuit of the ignition coil. To suppress individual ignition events, a controllable switch is provided, which is connected parallel to the primary winding of the ignition coil. For triggering the switch, a trip switch device is provided, which draws its requisite triggering energy from a separate circuit, for instance in the form of a blocking oscillator. With the aid of the blocking oscillator, the necessary control voltage for the switch, which is above the operating low voltage of the ignition system, is simultaneously furnished.
The object of the invention is to simplify the known circuit arrangement for suppression of individual ignition events in an ignition system.
ADVANTAGES OF THE INVENTION
The apparatus according to the invention has the advantage that only a few components are needed. Production involves only low cost. Moreover, because of the low number of components, the operational reliability of the circuit rises. The ease of connection to the existing ignition system, since only two connections have to be made on the primary side of the ignition system, is especially advantageous. The simplification of the circuit arrangement is attained by providing that the control energy for actuating a short-circuit switch disposed on the primary side is furnished after the opening of an ignition switch, from the energy stored in the ignition coil during the closing phase of the ignition switch.
The connection of the electrically controllable short-circuit switch parallel to the primary winding of the ignition coil is advantageous. This provision keeps the load on the ignition coil low.
The actuation of the short-circuit switch is especially simple if a further electrically triggerable control switch, which is preferably in the form of a MOSFET, is provided between the primary-side connection of the ignition coil, to which the ignition switch is connected, and the control input of the short-circuit switch.
A triac, which is preferably located in an optical coupler, is especially suitable as the control switch. The optical coupler assures an electrical separation between the control circuit of the short-circuit switch and the external trigger circuit of the short-circuit switch.
When the control switch is closed, a diode located between the primary-side connection of the ignition coil, to which the ignition switch is connected, and the short-circuit switch keeps blocking-state voltages of predetermined polarity away from the control input of the short-circuit switch.
A thyristor is especially suitable as the short-circuit switch.
BRIEF FIGURE DESCRIPTION
FIG. 1 shows a first embodiment of the ignition-event suppression circuit of the present invention; and
FIG. 2 shows a second embodiment of the invention, incorporating an optical emitter/coupler element.
DETAILED DESCRIPTION
FIG. 1 shows an ignition coil 10, which includes at least one primary and at least one secondary winding 11, 12. The generated ignition voltage appears at a secondary winding connection 13. A second secondary winding connection 14 is connected to a first primary winding connection 15. A diode and an ignition switch 17 are connected to the first primary winding connection 15. The ignition switch 17 is connected to a ground 18. A second primary winding connection 19 of the ignition coil 10 leads to a power supply connection 20. A short-circuit switch 21 is connected between the diode 16 and the power supply connection 20. A control switch 23 is connected between the diode 16 and one control input 22 of the short-circuit switch 21. The control switch 23 has a control input 24 that leads to a trigger circuit, not shown in further
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patent: 3940977 (1976-03-01), Voross et al.
patent: 3985109 (1976-10-01), Kondo et al.
patent: 4079310 (1978-03-01), Ortmann
patent: 4672941 (1987-06-01), Yamagata
patent: 4673883 (1987-06-01), Wheeler et al.
patent: 5089804 (1992-02-01), Mimura
Gaffin Jeffrey A.
Robert & Bosch GmbH
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