Emission Control at Idling and Start up Using Cold Start adsorber in Two Wheelers

Vol. 2 No. 1

Year: 2012

Issue: November’11-January’12

Title: Emission Control at Idling and Start up Using Cold Start adsorber in Two Wheelers 

Author Name: Sekaran, S. Mohanamurugan 

Synopsis: 

Under normal operating conditions, catalytic converters appear to be the most effective means of reducing air pollution from SI engines. The conversion efficiency, however, declines very steeply for temperatures below about 350 °C and is practically zero during the starting and warming-up period. Improving the conversion efficiency under these conditions is important, particularly in large cities, where the number of starting per vehicle per day tends to be high. Among the other solutions are preheating of the catalyst electrically, warming up of the catalyst in an external combustion chamber, installation of an auxiliary small-capacity catalytic converter, and employment of an adsorbing unit between two catalysts. Although these methods are quite effective, their disadvantage lies in the fact that they require an external energy source, an additional component (a control unit) or a three-stage catalyst. An Cold-Start Emissions Adsorber System (CSEAS) for reducing cold-start emission (HC,NOx and CO) have been developed combining existing catalyst  technologies with a zeolite based Adsorber. The series flow in-line concept offers a passive and simplified alternative to other technologies by incorporating one additional existing converter with additional valving, purging lines and secondary air.