Technical Paper
Partitioning Emissions Tasks Across Engine and Aftertreatment Systems
1999-10-25
1999-01-3475
Current and proposed emissions standards in the United States, Europe and Japan are creating unique markets for the introduction of new powertrain technology. Adding to the complexity of the evolving tailpipe emission standards are differing vehicle and dynamometer test cycles and increased emphasis on CO2 reduction and higher vehicle fuel economy. In addressing the challenges posed by increasingly more stringent emissions standards and demands for high efficiency powertrain technologies, partitioning the tailpipe emissions requirements has the potential to identify and dimension significant design, development and systems tasks. This paper describes the use of emissions index, the ratio of emissions mass flow to fuel mass flow, to define the tailpipe emissions capabilities required from engine/fuel/calibration and after-treatment/control systems.