Patent ID: 6675784
Filing Date: 2004-01-13
Classification: F02D,F02P

Abstract:
An ignition system for internal combustion engines comprising:a first series circuit including a d.c. power source, an energy storage coil, and a first switching device; a capacitor connected to the energy storage coil by way of a first reverse current blocking device; a second series circuit including a capacitor, a primary winding of an ignition coil, and a second switching device; a first switching device control means for turning on and off the first switching device to charge the capacitor with energy released by the energy storage coil, and turning on and off the second switching device during an ignition period thereby to feed the energy stored in the capacitor to the primary winding of the ignition coil; a second reverse current blocking device connected in parallel to the energy storage coil and the first reverse current blocking device in serial connection out of a series circuit including the d.c. power source, the energy storage coil, the first reverse current blocking device, the primary winding of the ignition coil, and the second switching device; and a second switching device control means for turning on and off the second switching device during the ignition period at an occurrence of system failure thereby to feed energy of the d.c. power source to the primary winding of the ignition coil by way of the second reverse current blocking device.