(125a) Servo-Control of Selective Catalytic Reduction in Diesel-Powered Vehicles
Developing reliable dynamic models and control techniques aimed at the operation of SCR has attracted attention of researchers in academia and industry. To balance high NOx reduction efficiency and low ammonia slip, several urea dosing control techniques have been recently proposed , . However, these techniques developed to date use models comprised of ordinary differential equations (ODEs) to control the SCR and use inlet and outlet sensors for the state and parameter estimation. The main drawback of these techniques is that models developed based on ODE cannot capture important SCR dynamics, so the highest performance of the SCR cannot be achieved; however, good performance can be achieved by using models involving a large number of ODEs at the expense of computational time. In the present work, we are employing the full complex SCR model which is characterized as distributed parameter systems. More precisely, the complex SCR model is consisting of coupled hyperbolic and parabolic partial differential equations (PDEs). In the present work, we are designing a feedforward boundary controller to address the reduction problem of the amount of NOx emissions.
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