(684g) Efficient Method for Real-Time Simulations of Monolith Reactors with Detailed Kinetic Models

As countries around the globe adapt more stringent emissions standards set by Real Driving Emissions (RDE) legislation, mathematical models are becoming ever more widely used as plant models for devising vehicle control strategies. It is important for the model to run on Hardware-in-Loop (HIL) and engine control unit (ECU) systems which have significantly less computational power and memory than modern personal computers. Washcoat diffusion limitations play a very important role in the efficient design of a catalytic converter. Numerical solution of aftertreatment models that include diffusion-reaction equations in the washcoat are computationally demanding. There are several simplified approaches proposed in the literature for the solution of diffusion-reaction equations in the washcoat to avoid the computational demand of the full numerical solution.

In this paper, we use the recently proposed Thiele matrix approximated Sherwood number solution and compare the results with that of the full numerical solution for both macro and micro kinetics of three-way catalyst (TWC). We also compared the accuracy of this novel solution with other traditional approaches. Comparison results are shown below:

Figure1: Comparison of the dimensionless exit CO concentration predicted by 1+1D model and reduced order models with various approximations to account for washcoat diffusion in a four reaction model of a TWC.