초록 ▼

An ignition system for an internal combustion engine is disclosed. The ignition system includes a timing signal detector responsive to the rotation speed of an engine to generate a pulse signal including a leading edge and a trailing edge corresponding to the ignition timing and having a predetermin

An ignition system for an internal combustion engine is disclosed. The ignition system includes a timing signal detector responsive to the rotation speed of an engine to generate a pulse signal including a leading edge and a trailing edge corresponding to the ignition timing and having a predetermined duty cycle, a triangular wave generator for generating a triangular wave voltage synchronized with the trailing edge of the pulse signal, a voltage storing circuit for storing the voltage level of the triangular wave voltage in synchronism with the leading edge of the pulse signal, a voltage divider for dividing the stored voltage in the voltage storing circuit to generate a reference voltage, a comparator for comparing the reference voltage and the triangular wave voltage to detect a difference therebetween, a charging and discharging controller for correcting the stored voltage in the voltage storing circuit so as to reduce to zero the difference at the leading edge of the pulse signal, a threshold voltage generator for generating a threshold voltage which is offset from the stored voltage by an amount corresponding to the desired dwell time of an ignition coil, and an energization controller for controlling the dwell time of the ignition coil in accordance with the result of a comparison between the threshold voltage and the triangular wave voltage.

대표청구항 ▼

An ignition system for an internal combustion engine comprising: timing signal detecting means responsive to a rotation speed of an engine to generate a pulse signal including a leading edge and a trailing edge corresponding to an ignition timing and having a predetermined duty cycle; triangular wav

An ignition system for an internal combustion engine comprising: timing signal detecting means responsive to a rotation speed of an engine to generate a pulse signal including a leading edge and a trailing edge corresponding to an ignition timing and having a predetermined duty cycle; triangular wave generating means for generating a triangular wave voltage synchronized with the trailing edge of said pulse signal; voltage storing means for storing a voltage level of said triangular wave voltage in synchronism with the leading edge of said pulse signal; a voltage divider for dividing the stored voltage in said voltage storing means to generate a reference voltage; comparing means for comparing said reference voltage and said triangular wave voltage to detect a difference therebetween; charging and discharging control means for correcting the stored voltage in said voltage storing means to reduce said difference at the leading edge of said pulse signal to zero; threshold voltage generating means for generating a threshold voltage which is offset from said stored voltage by a voltage value corresponding to a desired dwell time of an ignition coil; and energization control means for controlling a dwell time of said ignition coil in accordance with a result of a comparison between said threshold voltage and said triangular wave voltage.