• Walton
• Cockroft
• half wave
• full wave
• modelli
• ottimizzazione
• moltiplicatore
• motori
• accensione
• combustione
• breakdown
• simulazioni
• spark ignition
• labview
• spice
• matlab
• kicad
• scarica
• scintilla
• candela
• sperimentali
• multiplier

The purpose of this thesis is to design and implement an innovative electronic ignition system for Spark Ignition Engines to reduce pollutant emissions.
The system uses a Cockroft-Walton voltage multiplier to generate the high voltage needed to trigger a discharge between the electrodes in the combustion chamber.
The goal is to provide just the energy required to phase of the breakdown (0.3 ÷ 1 mJ), thus avoiding the phases of arc and glow discharge that are mainly responsible for the consumption of the spark plug electrodes.
It was possible to achieve an optimized version of the multiplier from the study of voltage multiplier through simulations and simplified models, capable of reducing the rise time of the output voltage and increase the maximum value by reducing the voltage drop caused by the junction capacitance of the diodes in reverse bias. This allows the system to trigger a second spark and increase the probability that combustion process starts correctly, reducing emissions. A control logic, based on microcontroller and Labview interface for communication with the PC, allows to manage the generation of discharges according to the trigger signal sent from the electronic control unit. In addition, through a feedback path, created by a compensated voltage divider between the output of the multiplier and the ADC the microcontroller, it is possible to determine accurately whether the combustion was successfully initiated and at what discharge.