Study on Adaptive Ignition Energy System of Two-Stroke Spark Ignition Engine

Kerosene is characteristic of higher flash point, poorer evaporation, higher energy density, higher use safety, higher ignition temperature, and slower combustion velocity than that of gasoline. Therefore, kerosene is widely used in the field of navigation. The ignition energy and spark timing should be adjusted and corrected as the fuel of two-stroke engine is substituted for kerosene. This paper aims at the capacitor discharge ignition (CDI) of magneto of two-stroke engine, and focuses on the problems of lacking of ignition energy during the engine working at very low speeds for cold weather starting, high speed and combusting kerosene. The digital adaptive ignition energy control system is proposed taking the factor of the engine speeds and throttle angle, and the corresponding circuit is designed in the paper. Experiment results show that the ignition system established in this paper is effective and practical.