| 摘要 |
Method and arrangement for a capacitive ignition system in an internal combustion engine. In this, the discharging and charging of an ignition capacitor (24) is controlled by a control unit (40) which actuates a first circuit-breaking element (14) in a discharging circuit and a second circuit-breaking element (30) in a charging circuit. The ignition spark which is obtained in an ignition circuit on discharging of the ignition capacitor via the primary winding of an ignition coil is certainly powerful, but of short duration. Under certain operating conditions it is difficult for such a spark to ignite reliably in particular a lean fuel/air mixture. For the purpose of prolonging the said ignition spark, the present invention is chiefly characterized in that the control unit (40), at a time following the ordinary ignition time, actuates the second circuit-breaking element (30) in such a way that this is kept conductive simultaneously with the first circuit-breaking element (14). Current is then supplied from an electrical energy source (33) and via the primary winding (10). Thereafter, the control unit (40) actuates either of the circuit-breaking elements in such a way that the current supply via the primary winding (10) is interrupted, by which means a renewed ignition voltage generation is obtained which prolongs the ordinary ignition spark. |
