EFFECT OF HEATING STRATEGY ON LIGHTOFF TEMPERATURE OF EXHAUST GAS CATALYTIC CONVERTOR OF MOTORCYCLE

Abstract

This paper presents the modeling results of the effect of additional heating
strategy of the exhaust gas catalytic convertor of motorcycles by high-frequency
current during the cold start and warm-up period on the convertor’s lightoff
temperature (effective working temperature). The study results on Honda Lead
110 engine show that with the same limited high-frequency energy supplied
from the battery of each additional heating period, the additional convertor
heating with high power in a short time helps increase convertor’s temperature
faster than the additional heating in longer time with lower power to heat the
convertor to its lightoff temperature. By a reasonable additional heating
strategy, it is possible to shorten the required time for the convertor to reach its
lightoff temterature of 523K (250oC) from 220s to 25s in fast idling mode. This
means that the inactive time of the convertor during engine cold start and warm
up is reduced by over 88% compared to the case of no additional heating, thus
significantly reducing harmful emissions during this period.