| 摘要 |
<p>An ignition system for a spark ignited internal combustion engine. The system can apply alternating current IS to the electrodes of a spark plug (10) to maintain an arc at the electrodes for the desired length of time. The amplitude of the arc current can be varied. The alternating current IC is developed by a DC to AC inverter (26) that is comprised of a transformer (14) that has a centre tapped primary (16) and a secondary (12) that is connected to the spark plug (10). An arc is initiated at the spark plug 10 by discharging a capacitor C through one of the winding portions (16A, 16B) of the centre-tapped primary (16). Alternatively, the energy stored in an inductor (31) can be supplied to a primary winding portion (16A, 16B) to initiate an arc. The ignition system is powered by a controlled current source (28) that receives input power from a source of direct voltage (29) such as a battery on a motor vehicle. <IMAGE></p> |
