Computer modeling of electrical regeneration diesel particulate traps entails a variety of analytical fields including fluid flow, thermodynamics, heat transfer, particle technology, engine simulation, and combustion. Though extensive modeling has been performed on specific areas of electrical regeneration traps, very little has been performed on modeling the entire system. A system level approach to simulating an electrical regeneration trap would greatly improve the design optimization process of these systems. This paper describes a computer model that simulates the operation of an electrical regeneration diesel particulate trap. The model is used to predict a ceramic wall flow trap's performance on an urban bus and a comparison between the predicted values to actual data is made.