초록 ▼

An ignition system for internal combustion engines comprises means for generating an ignition signal in synchronism with the revolution of an internal combustion engine and an ignition circuit device for interrupting a primary current of an ignition coil in accordance with the ignition signal. The i

An ignition system for internal combustion engines comprises means for generating an ignition signal in synchronism with the revolution of an internal combustion engine and an ignition circuit device for interrupting a primary current of an ignition coil in accordance with the ignition signal. The ignition circuit device includes an ignition monitor signal producing circuit for producing an ignition monitor signal which circuit operates to set the ignition monitor signal at the time of starting the energization of the ignition coil and thereafter to reset the ignition monitor signal at a subsequent predetermined timing, whereby the ignition circuit device operates, in accordance with the pulse width and the set and reset conditions of the ignition monitor signal, to decide whether the operation of the ignition circuit device is normal or abnormal, to control to generate a predetermined amount of ignition energy, and to prevent erroneous generation the ignition monitor signal due to a noise or the like.

대표청구항 ▼

An ignition system for internal combustion engines comprising an electronic control unit for computing an ignition timing electronically in accordance with parameters of an internal combustion engine, computing an energization time of an ignition coil and producing a pulse-shaped ignition signal in

An ignition system for internal combustion engines comprising an electronic control unit for computing an ignition timing electronically in accordance with parameters of an internal combustion engine, computing an energization time of an ignition coil and producing a pulse-shaped ignition signal in accordance with a result of the computation, and ignition circuit means for interrupting a primary current of the ignition coil on the basis of the ignition signal supplied from said electronic control unit and producing an ignition monitor signal, wherein said ignition circuit means includes set means for setting the ignition monitor signal at a timing of starting energization of the ignition coil, first reset means for resetting the ignition monitor signal when the primary current of the ignition coil has exceeded a first reference level and has reached a second reference level higher than the first reference level, second reset means for resetting the ignition monitor signal when the primary current of the ignition coil is interrupted before the primary current reaches the second reference level after the primary current has exceeded the first reference level, and maintenance means for maintaining a preceding state without resetting the ignition monitor signal when the primary current does not reach the first reference level.