The optimization of Exhaust and Catalytic Converter System for ULEV-II using the Robust Design 2007-01-0560
The conventional aftertreatment systems to meet the stringent ULEV-II emission regulation are usually composed of warm-up catalytic converter (WCC) and underfloor catalytic converter (UCC). However, those systems bring high cost, high back pressure, the limit of engine room for package design, and other side effects. The new optimized system needs to solve these problems and to meet ULEV-II emission regulation efficiently.
There are many technologies and design parameters in exhaust catalytic converter systems; exhaust manifold structure, exhaust gas flow distribution, location of catalytic converter, PM coating technologies, substrate characteristics, and volume of catalysts. It is a key factor to make a optimized robust system with those parameters and technologies described.
The new optimized exhaust and Integrated Close-coupled Catalytic Converter (ICCC) system can meet ULEV-II regulation and can solve those problems of conventional system by a robust design. This study was focused on the optimization process of exhaust and ICCC system to determine robust design control factors, which are durability of catalyst - aged and/or fresh -, by vehicle evaluation, FTP-75.