초록 ▼

An ignition coil control circuit compares the coil input current with a reference level, and the duty ratio of the output current is altered accordingly. The reference level is raised during cold weather operations, raising the duty ratio. Once the operating temperature of the engine rises above a p

An ignition coil control circuit compares the coil input current with a reference level, and the duty ratio of the output current is altered accordingly. The reference level is raised during cold weather operations, raising the duty ratio. Once the operating temperature of the engine rises above a predetermined level, a detector circuit activates a control signal generator which lowers the reference level received by the comparator to lower the duty ratio accordingly.

대표청구항 ▼

A combination, comprising means for generating a first signal having a variable cycle period, means for providing a second signal having a predetermined level, means responsive to said first and second signals for producing pulse signals having a predetermined pulse width corresponding to said varia

A combination, comprising means for generating a first signal having a variable cycle period, means for providing a second signal having a predetermined level, means responsive to said first and second signals for producing pulse signals having a predetermined pulse width corresponding to said variable cycle period of said first signal, means for detecting an operating temperature and being responsive to the detected operating temperature to create a detection signal representing that said operating temperature is lower than a predetermined temperature, and means responsive to said detection signal for changing the level of said second signal from said predetermined level to another level, whereby said producing means produces a pulse signal having a pulse width different from said predetermined pulse width when said operating temperature is lower than said predetermined temperature. An ignition system for an internal combustion engine comprising an input circuit providing an input signal synchronized with the rotation of said internal combustion engine, an ignition coil generating an ignition energy, an output circuit feeding a current through said ignition coil, a feedback circuit producing a feedback signal in response to a current flowing through said ignition coil, a signal supply circuit supplying to said output circuit a signal for controlling a current supply period of time to said ignition coil in response to said input signal and said feedback signal, a detection circuit detecting an operating temperature of said internal combustion engine and producing a detection output, said detection output taking a first value when said operating temperature is lower than a predetermined temperature and a second value when said operating temperature is equal to or higher than said predetermined temperature, and a control circuit increasing the level of said feedback signal from a first level to a second level in response to said first value of said detection output and decreasing said level of said feedback signal from said second level to said first level in response to said second value of said detection output, said current supply period of time to said ignition coil becoming longer than a predetermined period of time in response to said second level of said feedback signal, said current supply period of time to said ignition coil becoming equal to said predetermined period of time in response to said first level of said feedback signal.