This paper describes the application of a systems approach to address future passenger car diesel engine requirements. To meet future emissions targets, it is necessary to minimise engine out feedgas emissions and to ensure the best interaction between in-cylinder combustion and aftertreatment whilst providing competitive torque, power, refinement and driveability. To improve system operating ranges, a lean NOx aftertreatment system has been explored, consisting of an underfloor catalyst in series with a close coupled catalyst with controlled bypass. The aftertreatment system was configured to improve NOx conversion efficiencies through detailed understanding of feedgas/catalyst interactions. The use of in-cylinder post injection and other measures to improve feedgas constituents has been investigated. A detailed study of exhaust gas speciation as a function of both pilot and post in-cylinder injection timing and quantity is also summarised. A sophisticated optimisation process was utilised using design of experiments to determine the best control parameter settings for the combustion and aftertreatment system. The paper concludes with a system specification and calibration achieving in excess of 25 % aftertreatment conversion in drive cycle tests.
A combined combustion and aftertreatment approach to achieve future emissions standards
Verfahren der kombinierten Verbrennung und Nachbehandlung zur Erfüllung künftiger Emissionsstandards
2000
14 Seiten, 12 Bilder, 2 Tabellen, 8 Quellen
Aufsatz (Konferenz)
Englisch
A combined combustion and aftertreatment approach to achieve future emissions standards
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