title: Effect of advanced aftertreatment for PM and NO(x) control on heavy-duty diesel truck emissions.
abstract: Emissions from four heavy-duty and medium-duty diesel vehicles were tested in six different aftertreatment configurations using a chassis dynamometer. The aftertreatment included four different diesel particle filters (DPF) and two prototype selective catalytic reduction (SCR) devices for NO(x) control. The goal of the project was to fully characterize emissions from various in-use vehicles meeting the 2007 particulate matter (PM) standard for the United States and California and to provide a snapshot of emissions from 2010 compliant vehicles. The aftertreatment devices all worked as designed, realizing significant reductions of PM and NO(x). The DPF realized > 95% PM reductions irrespective of cycle and the SCRs > 75% NO(x) reductions during cruise and transient modes, but no NO(x) reductions during idle. Because of the large test matrix of vehicles and aftertreatment devices, we were able to characterize effects on additional emission species (CO, organics, and nucleation mode particles) from these devices as a function of their individual characteristics. The two predicting parameters were found to be exhaust temperature and available catalytic surface in the aftertreatment, which combine to create varying degrees of oxidizing conditions. The aftertreatments were not found to incur a fuel penalty.
authors.affiliation: California Air Resources Board, 1001 'I" Street, P.O. Box 2815, Sacramento, California 95812, USA. jherner@arb.ca.gov
authors.forename: Jorn Dinh
authors.initials: JD
authors.lastname: Herner
authors.forename: Shaohua
authors.initials: S
authors.lastname: Hu
authors.forename: William H
authors.initials: WH
authors.lastname: Robertson
authors.forename: Tao
authors.initials: T
authors.lastname: Huai
authors.forename: John F
authors.initials: JF
authors.lastname: Collins
authors.forename: Harry
authors.initials: H
authors.lastname: Dwyer
authors.forename: Alberto
authors.initials: A
authors.lastname: Ayala
mesh_terms: D000393:Air Pollutants / Q000032:analysis*; D000397:Air Pollution / Q000517:prevention & control*; D001272:Atmosphere; D002244:Carbon / Q000032:analysis* / Q000737:chemistry; D004784:Environmental Monitoring / Q000379:methods; D052918:Environmental Restoration and Remediation / Q000379:methods*; D004867:Equipment Design; D018986:Motor Vehicles; D009569:Nitric Oxide / Q000032:analysis*; D052638:Particulate Matter / Q000737:chemistry*; D011084:Polycyclic Aromatic Hydrocarbons / Q000032:analysis; D014186:Transportation; D001335:Vehicle Emissions / Q000032:analysis*
chemical_list: D000393:Air Pollutants; D052638:Particulate Matter; D011084:Polycyclic Aromatic Hydrocarbons; D001335:Vehicle Emissions; D009569:Nitric Oxide; D002244:Carbon