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Digital Capacitive Discharge Ignition
The Two-Wheelers industry comprised of scooters, motorcycles and mopeds, commonly use an engine ignition system based on capacitive discharge method. The Capacitive Discharge Ignition(CDI) system utilizes the energy transferred from magneto to a storage capacitor. When released as a high voltage pulse via a step-up transformer to a spark plug which ignites the fuel mixture inside the cylinder. The digital CDI allows the user to monitor the speed of the engine to calculate the accurate timing for the spark which increases engine efficiency, saves energy and reduces emissions.
Design Considerations
- Robust, General Purpose Microcontroller Family with a small footprint
Solutions
- PIC16 and PIC18 microcontrollers enable a broad array of on-chip peripherals which provide the system designer with flexible options for consideration in addressing the requirements of a variable timing CDI system. In such a system, the speed of the engine is monitored electronically with a PICmicrocontroller which also provides accurate timing for the spark. With a PICmicrocontroller, the ignition spark can be made to occur anytime for a particular engine speed allowing ignition angle customization for different engine designs which supports the requirements of improved fuel efficiency and reduced emissions.
- Utilizing the small footprints of the PICmicrocontrollers and coupled with robust design innovations without sacrificing performance, the PICmicrocontroller based digital CDI systems can be delivered at reduced system costs.
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