초록 ▼

An ignition apparatus for an engine limits the primary winding current of an ignition coil to a prescribed level. The conducting time of drive transistors which control the primary winding current is controlled on the basis of the voltage across a capacitor which is charged by a signal generator. At

An ignition apparatus for an engine limits the primary winding current of an ignition coil to a prescribed level. The conducting time of drive transistors which control the primary winding current is controlled on the basis of the voltage across a capacitor which is charged by a signal generator. At normal engine speeds, when the primary winding current reaches the prescribed level, current is bypassed around the capacitor by a bypass transistor. When the engine is cranking and the signal generator voltage is low, a switching transistor disables the bypass transistor, and the capacitor is not bypassed, thereby preventing misfiring.

대표청구항 ▼

An ignition apparatus for an internal combustion engine comprising: an ignition coil having a primary winding and a secondary winding; a first switching member connected in series with the primary winding of the ignition coil; current sensing means for determining when the current flowing through th

An ignition apparatus for an internal combustion engine comprising: an ignition coil having a primary winding and a secondary winding; a first switching member connected in series with the primary winding of the ignition coil; current sensing means for determining when the current flowing through the primary winding reaches a prescribed level; a signal generator which generates an alternating current signal is synchrony with the engine; a capactor which is charged by the signal from the signal generator; a duty cycle controller connected to the capacitor and the signal generator for generating an output signal which changes from a first level to a second level at a prescribed voltage of the signal generator output signal and which has a duty cycle which is a function of the capacitor voltage; a drive circuit connected to the duty cycle controller for closing the first switching member while the duty cycle controller has the first level; a bypass circuit responsive to the current sensing means for preventing the signal generator from charging the capacitor when the current sensing means determines that the primary winding current reaches the prescribed level; and bypass preventing means responsive to the capacitor for preventing the operation of the bypass circuit when the capacitor voltage is below a prescribed level.