Browse Publications Technical Papers 2019-01-0734
2019-04-02

Model Predictive NO x Emission Control for a Biodiesel Engine Coupled with a Urea-based Selective Catalytic Reduction System 2019-01-0734

Diesel engines have been the major power source for medium- to heavy-duty ground vehicles due to superior fuel efficiency and durability over gasoline engines. However, Diesel engines are the main contributors for non-renewable Diesel fuel consumption and NOx and particulate matter (PM) emissions. Biodiesel fuel has been considered as a promising alternative fuel and can be directly fed into Diesel engines without major modifications. In addition, biodiesel has demonstrated lower hydrocarbon (HC), carbon monoxide (CO), and PM emissions than Diesel fuel. Nevertheless, the NOx emissions of biodiesel are generally higher. To meet stringent NOx emission regulation, urea-based selective catalytic reduction (SCR) systems have been widely utilized in Diesel-powered vehicles. The application of biodiesel fuel to Diesel engines can significantly change the exhaust condition and thus increase the complexity of SCR design and controls. This paper presents a fuel-adaptive nonlinear model predictive control (NMPC) method for selective catalytic reduction (SCR) system with biodiesel applications. A proper urea dosing strategy is derived as the solution of a NMPC problem such that both NOx and ammonia emission requirements can be met simultaneously. Experimental and simulation studies suggest the need to increase SCR size for biodiesel applications. Simulation results demonstrate the effectiveness of proposed NMPC-based controller for biodiesel applications. Such a SCR control strategy can be instrumental for reducing tailpipe emissions for flexible-fuel ground vehicles in the future.

SAE MOBILUS

Subscribers can view annotate, and download all of SAE's content. Learn More »

Access SAE MOBILUS »

Members save up to 18% off list price.
Login to see discount.
Special Offer: Download multiple Technical Papers each year? TechSelect is a cost-effective subscription option to select and download 12-100 full-text Technical Papers per year. Find more information here.

Due to current capacity constraints, printed versions of our publications - including standards, technical papers, EDGE Reports, scholarly journal articles, books, and paint chips - may experience shipping delays of up to four to six weeks. We apologize for any inconvenience.
We also recommend:
TECHNICAL PAPER

A Real-Time Control Framework for Integrated Diesel Engine and Selective Catalytic Reduction System

2019-01-1287

View Details

TECHNICAL PAPER

Development and Experimental Validation of a Control Oriented Model of a Catalytic DPF

2019-01-0985

View Details

STANDARD

Biodiesel in Automotive Application; Lessons Learned

J3050_201412

View Details

X