Simulation of Catalytic Oxidation and Selective Catalytic NOx Reduction in Lean-Exhaust Hybrid Vehicles Oak Ridge National Laboratory

Format:

Conference/Event

Author/Creator:

Gao, Gao, author.

Contributor:

Chakravarthy, V. Kalyana

Daw, C. Stuart

Conference Name:

SAE 2012 World Congress & Exhibition (2012-04-24 : Detroit, Michigan, United States)

Language:

English

Physical Description:

1 online resource

Place of Publication:

Warrendale, PA SAE International 2012

Summary:

We utilize physically-based models for diesel exhaust catalytic oxidation and urea-based selective catalytic NOx reduction to study their impact on drive cycle performance of hypothetical light-duty diesel-powered hybrid and plug-in hybrid vehicles (HEVs and PHEVs). The models have been implemented as highly flexible SIMULINK block modules that can be used to study multiple engine-aftertreatment system configurations. The parameters of the NOx reduction model have been adjusted to reflect the characteristics of commercially available Cu-zeolite catalysts, which are of widespread current interest. We demonstrate application of these models using the Powertrain System Analysis Toolkit (PSAT) software for vehicle simulations, along with a previously published methodology that accounts for emissions and temperature transients in the engine exhaust. Our results illustrate that the DOC-SCR combination can reduce CO, HC and NOx emissions without creating a significant direct fuel penalty, but there is also an increase in the possibility of ammonia slip. Also, the addition of an upstream DOC increases aftertreatment thermal inertia, delaying light-off of the SCR catalyst. We find that the emissions reduction efficiency of the DOC-SCR combination is better for our simulated HEV compared to our simulated PHEV

Notes:

Vendor supplied data

Publisher Number:

2012-01-1304

Access Restriction:

Restricted for use by site license