Abstract
The new emission stages, Euro 6 in Europe and SULEV /PZEV in the USA, pose severe challenges on the quality of a car engine’s combustion and exhaust aftertreatment systems. Since most of today’s systems achieve very good emission control results under hot operating conditions, the tougher challenges are presented by the reduction of cold-start emissions and the rapid heating of the exhaust aftertreatment system. The following article by Pierburg and Audi shows how secondary air assists in achieving these goals besides examining other aspects of the secondary air process.
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