Currently, throughout the world combustion engine development is influenced by two primary concerns. First is the increasing concern for global warming, and second is the concern over particulate and oxides of nitrogen emissions, each of which affect the environment and human health because of the particles' toxicity and ground level ozone production, respectively.
To address the global warming issue, in late 1997, various nations approved the
To address the emission concerns, the European Community and the U.S. Environmental Protection Agency (EPA) proposed emissions standards prescribing substantial reductions of NOX and PM emissions [
This paper describes new approaches to ultra low emission Diesel vehicles that comply with the proposed emission standards. Advanced exhaust gas aftertreatment technology, including Diesel particulate filters and NOX catalysts, have previously been subjected to detailed research. In this paper, some new approaches are described, and their potential to large-scale vehicle application is assessed.