Equivalence Ratio Modeling Techniques for Air Fuel Ratio Control
This short course presents the equivalence ratio method of modeling for emissions and shows how this model can be used to create and accurate air fuel ratio control scheme for lean burn pipeline engines. The course begins by teaching the basics of equivalence ratio modeling. It introduces a series of mathematical equations that are used in the non-dimensional equivalence ratio model. The modeling technique can be used to determine engine emissions performance under a wide variety of operating conditions will be covered in detail, so that the attendee will gain a solid understanding of the importance of mass air fuel ratio and its relationship to emissions. The authors will also covers secondary variables like scavenging and ignition timing. The second session of the course will focus on turning the emissions model around so that it can be deployed as an air fuel ratio control scheme. The details of equation development and implementation will be covered, as will the efforts required for commissioning. An example model will be used to show how the results from the equivalence ratio model and compare them to the results from some of the common approaches in the industry. At the conclusion of the short course, the attendee will not only understand the basics of equivalence ratio modeling, but they will also understand how this model can be used to develop a very robust air fuel ratio control scheme for lean burn pipeline engines.