| 摘要 |
The invention relates to an ignition system for a 14 V or 42 V on-board power system voltage which is connected to the ignition transformer directly via the semiconductor power output stage without an intermediate power unit. After an input signal from a superordinate engine control device, the semiconductor power output stage is switched on by an ignition control device. As a result, a current is built up at the primary side of the ignition transformer. After the predefined maximum current value is reached for the first time, the primary side of the ignition transformer is switched off for a predefined time period. In this time period, a maximum voltage for the spark breakdown is built up at the electrodes of the spark plug according to the principle of self induction. After the spark breakdown, the primary side of the ignition transformer is timed and current-limited up to the end of the ignition process which is predefined by the superordinate engine control device. The timed control operates with selected, predefined time intervals by means of which the semiconductor power output stage is alternately switched on and off. A current limitation is superimposed on this timed control and switches off the primary side of the ignition transformer whenever the primary current reaches the predefined maximum value.
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