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Control of Diesel HCCI Modes Using Cylinder Pressure-Based Controls
Published October 22, 2006 by Society of Automotive Engineers of Japan in Japan
Early and late premixed charge compression ignition (PCCI) combustion modes are being explored to control the emissions from diesel engines. Combustion feedback control systems can enable the robust application of PCCI combustion by correcting variations in engine systems which cause dispersion in emissions among vehicles. Combustion feedback control also provides a tool to continuously monitor and adjust for environmental effects and system ageing. This work explores the use of cylinder-pressure-based, combustion-phasing estimators to control injection timing for early and late HCCI modes. A novel method using IMEP estimates was developed to balance individual cylinder fuel injection quantities. The impact of individual cylinder fuel injection quantity and timing control on emissions, stability and combustion noise are also evaluated.