The Effect on Exhaust Gas By Altering Primary Circuit Voltage in SI Engine

Emissions from internal combustion engines using fossil fuels have attracted attention as a major contributor to air pollution and global warming, resulting in tightened emissions regulations. Therefore, eco-friendly vehicles that replace fossil fuels are gradually increasing. However, due to the lack of charging facilities and infrastructure, it is inevitable to use internal combustion engines until eco-friendly cars become popular. Therefore, the voltage applied to the ignition coil is lowered due to the increase in resistance and the aging of the circuit elements in the switch contact portion of the ignition primary circuit of the aged SI engine. This causes an increase in emissions of harmful gases, and it is necessary to take counter measures against prevention and maintenance cycles accordingly. In this paper, when the supply voltage of the ignition primary circuit is within the normal range (approximately 14 V) and the voltage drop due to the resistance of the ignition primary circuit is supplied, the ignition 1. The correlation between the ignition energy and the exhaust gas was analyzed by measuring the harmful emissions, emitted by the effect of the ignition energy reduction with the increase in resistance of the next circuit. The damage of the ignition primary circuit is increased due to the burnout of contacts due to the aging of circuit elements, and thus the harmful exhaust gases (CO, HC, etc.) causing air pollution are increased due to the reduced ignition energy. Therefore, even if the voltage drop of the ignition primary circuit does not occur directly, such as relief and start-up, the voltage drop across the ignition primary coil when the reference value of the exhaust gas (CO) is measured by 1.0% or more according to environmental regulations. Management was confirmed experimentally.