Model Predictive Control of a Combined EGR/SCR HD Diesel Engine Scania CV AB

Format:

Conference/Event

Author/Creator:

Westerlund, Westerlund, author.

Contributor:

Egnell, Rolf

Odenbrand, Ingemar

Westerberg, Bjorn

Conference Name:

SAE 2010 World Congress & Exhibition (2010-04-13 : Detroit, Michigan, United States)

Language:

English

Physical Description:

1 online resource

Place of Publication:

Warrendale, PA SAE International 2010

Summary:

Achieving upcoming HD emissions legislation, Euro VI/EPA 10, isa challenge for all engine manufacturers. A likely solution to meetthe NOx limit is to use a combination of EGR and SCR.Combining these two technologies poses new challenges andpossibilities when it comes to optimization and calibration.Using a complete system approach, id est, considering the engineand the aftertreatment system as a single unit, is important inorder to achieve good performance. Optimizing the complete systemis a tedious task; first there are a large number of variableswhich affect both emissions and fuel consumption (injection timing,EGR rate, urea dosing, injection pressure, pilot/post injections,for example). Secondly, the chemical reactions in the SCR catalystare substantially slower than the dynamics of the diesel engine andthe rest of the system, making the optimization problem timedependent.The engine studied is a 13-liter heavy-duty diesel engineequipped with a vanadia-based SCR system. The diesel engine usescommon rail fuel injection, a variable geometry turbocharger (VGT)and cooled EGR.In this paper, a Model Predictive Control (MPC) application ispresented. The controller minimizes brake specific fuel consumption(including urea cost) by simultaneously optimizing engine outNOx and urea dosing, while maintaining emissions at EuroVI levels. The MPC is applied to the World Harmonized Test Cycles(WHSC/WHTC). Improvements in both fuel economy and emissions can beachieved by using the optimization/control method suggested

Notes:

Vendor supplied data

Publisher Number:

2010-01-1175

Access Restriction:

Restricted for use by site license