초록 ▼

An improved ignition system uses feedback techniques to maintain a constant high energy ignition spark level over the normal range of engine RPM. The feedback automatically compensates for environmental and aging effects such as increased ignition coil resistance and decreased battery voltage. A vol

An improved ignition system uses feedback techniques to maintain a constant high energy ignition spark level over the normal range of engine RPM. The feedback automatically compensates for environmental and aging effects such as increased ignition coil resistance and decreased battery voltage. A voltage controlled monostable multivibrator produces pulses determining the “on”time of an electronic switch which is in series with the coil. Current through the coil is sensed by a generator which feeds back an appropriate signal to control the monostable whereby a constant dwell time is maintained. At very high engine RPM a second feedback source servo-controls the system to a constant dwell angle condition. A constant dwell angle is also established at cranking speeds by a second pulse generator in parallel with the first.

대표청구항 ▼

An ignition system for an internal combustion engine comprising an ignition coil having primary and secondary windings, the secondary winding providing a high voltage spark suitable for engine firing, the primary winding series connected between a bias supply and an electronic switch, the switch ope

An ignition system for an internal combustion engine comprising an ignition coil having primary and secondary windings, the secondary winding providing a high voltage spark suitable for engine firing, the primary winding series connected between a bias supply and an electronic switch, the switch operable to conductively couple or nonconductively decouple the primary to a reference terminal dependent on signals at a switch control terminal, a sensor operably coupled to the engine producing a periodic output voltage in synchronism to the engine cycle, a controlled pulse generator, having first and second inputs, synchronized to the sensor signal and coupling to the control terminal of the electronic switch, the generator providing a pulse having a leading edge suitable for activating the switch to a conductive state and a trailing edge suitable for activating the switch to a nonconductive state, the trailing edge synchronized to occur at a predetermined engine position, the leading edge predeterminedly controlled by either of said two pulse generator inputs, the first generator input being a current limit generator input which couples to means for generating a first control signal representative of the time during each engine cycle that the coil primary carries a minimum predetermined current, and the second generator input being a coil off time generator input which couples to a means for generating a second control signal representative of the time during each engine cycle that the switch and coil are in a nonconductive state.