Continuous Injection-Rate Shaping for Passenger Car Diesel Engines – Potential, Limits and Feasibility

Authors

Dipl.-Ing. O. Predelli, Dipl.-Ing. R. Gratzke, Dipl.-Ing. A. Sommer, Dipl.-Ing. R. Marohn, Ingenieurgesellschaft Auto und Verkehr GmbH (IAV GmbH), Berlin; Dr.-Ing. F. Atzler, Dipl.-Ing. H. Schüle, Dr.-Ing. O. Kastner, Dipl.-Ing. N. Nozeran, Continental Automotive GmbH, Regensburg

Year

2010

Print Info

Fortschritt-Berichte VDI, Reihe 12, Nr. 716

Summary

Injection-rate shaping for passenger-car diesel engines is a technique on the verge of a breakthrough. In addition to reducing particulate emission, the method is capable of significantly cutting combustion noise, the Achilles heel of the DI diesel combustion process. As a result, injection-rate shaping shows clear advantages over alternative lowemission combustion processes, such as PCCI, which, although also capable of improving raw emissions in relation to NOx and soot, are less convincing from the aspect of diesel knock and the emission of CO and CO2. Of the modern Common-Rail injection systems, only two permit continuous injection-rate shaping in addition to the hitherto customary strategy of multiple injection. One of them is the Continental PCR NG system. This uses piezo-actuated Common-Rail injectors with direct actuation of the injector nozzle needle. The electronic engine control system provides the capability of determining how far the injector nozzle needle opens. The ability to control the injection curve of each individual injection event gives the engine developer new degrees of freedom in optimizing the combustion process...

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