SAE International Improvement of SiC DPF Control Strategies for Uncontrolled Regenerations with the Aid of Quasi 3D DPF Model 2008-01-1753

With more and more stringent standards concerning soot mass and number at the tailpipe of Diesel vehicles, the control of Diesel Particulate Filter regenerations is becoming a key feature for car manufacturers. When regulations on particle number will appear, even low cracking of the DPF could lead to the non-conformity of the filter with respect to the regulations. Strategies of regeneration control are often developed for the most critical regeneration conditions for DPF durability, the so-called "Back to Idle" tests. The development of those strategies is time-consuming, since the influence of the engine tuning on regeneration control means to load DPF for each engine tuning tested. Moreover, as the best engine tuning strategy is determined relatively to other strategies results, one needs very repeatable tests conditions and soot loading in terms of distribution and soot reactivity. This repeatability is very hard to get in real conditions. In this study, we used both experiments on a diesel vehicle with empty DPF and a 3D DPF regeneration model to simulate the effect of several engine tuning strategies to decrease the maximum internal temperature in the worse "Back to Idle" conditions.