State Predictive Control of the Temperature in Diesel Engine Exhaust Gas Aftertreatment Systems

In order to comply with NOx emission regulations, SCR (Selective Catalytic Reduction) system in the diesel engine exhaust gas aftertreatment is required to be precisely controlled in the most efficient temperature range. In this paper, we focus on the feature of the SCR system which inherits various heat transfer delays, and derive a design method of optimized predictive servomechanism which attains favorable transient. The efficacy of the proposed method is evaluated based on rigorous engine simulation, and the strengths and limitations are discussed.