10th Symposium "The Working Process of the Internal Combustion Engine"
Control of Passenger Car Diesel Engines with Alternative Combustion
Authors
Dr. Theodor Sams, Dipl.-Ing. Klemens Neunteufl, Dipl.-Ing. Ludwig Bürgler, AVL List GmbH, Graz
Year
2005
Summary
Alternative combustion concepts for Diesel engines are known for substantial reductions of both NOx and particulate emissions. This is achieved with a partially homogeneous mixture and high charge dilution, which is the reason that these combustion concepts are only suitable for part load. As the combustion process is nearly decoupled from the fuel injection event, it is very sensitive for changes in temperature and oxygen content of the cylinder charge. In the real engine, alternative and conventional combustion have to be combined, without the driver noticing the transitions. This paper presents the basics as well as test results of a cylinder pressure guided engine control system called AVL-CYPRESS™ (Cylinder Pressure based Engine Management System). Based on the cylinder pressure essential combustion parameters are determined cycle to cycle and closed-loop controlled to the required target values.
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