IGNITION SYSTEM FOR INTERNAL COMBUSTION ENGINES

• Main Author: SCHMOLLA, WILFRIED
• Format: Patent
• Language: English; French; German
• Published: 04.02.2004
• Edition: 7
• Subjects: BLASTING; COMBUSTION ENGINES; HEATING; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS; IGNITION, OTHER THAN COMPRESSION IGNITION, FORINTERNAL-COMBUSTION ENGINES; LIGHTING; MECHANICAL ENGINEERING; TESTING OF IGNITION TIMING IN COMPRESSION-IGNITION ENGINES; WEAPONS

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 discharge, the primary side of the ignition transformer is timed and current-limited until the end of the ignition process which is predefined by the superordinate engine control device. The timed control operates with selected, predefined time intervals for switching the semiconductor power output stage alternately on and off. A current limitation is superimposed on the timed control and switches off the primary side of the ignition transformer whenever the primary current reaches a predefined maximum value.