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Equivalence Ratio-EGR Control of HCCI Engine Operation and the Potential for Transition to Spark-Ignited Operation
Technical Paper
2001-01-3613
ISSN: 0148-7191, e-ISSN: 2688-3627
Annotation ability available
Sector:
Event:
SAE 2002 World Congress & Exhibition
SAE International Fall Fuels & Lubricants Meeting & Exhibition
Language:
English
Abstract
This research investigates a control system for HCCI engines, where equivalence ratio, fraction of EGR and intake pressure are adjusted as needed to obtain satisfactory combustion. HCCI engine operation is analyzed with a detailed chemical kinetics code, HCT (Hydrodynamics, Chemistry and Transport), that has been extensively modified for application to engines. HCT is linked to an optimizer that determines the operating conditions that result in maximum brake thermal efficiency, while meeting the peak cylinder pressure restriction. The results show the values of the operating conditions that yield optimum efficiency as a function of torque and rpm. The engine has high NOx emissions for high power operation, so the possibility of switching to stoichiometric operation for high torque conditions is considered. Stoichiometric operation would allow the use of a three-way catalyst to reduce NOx emissions to acceptable levels. Finally, the paper discusses the possibility of transitioning from HCCI operation to SI operation to achieve high power output.
Authors
Citation
Martinez-Frias, J., Aceves, S., Flowers, D., Smith, J. et al., "Equivalence Ratio-EGR Control of HCCI Engine Operation and the Potential for Transition to Spark-Ignited Operation," SAE Technical Paper 2001-01-3613, 2001, https://doi.org/10.4271/2001-01-3613.Also In
Homogeneous Charge Compression Ignition (Hcci) Combustion 2002
Number: SP-1688; Published: 2002-03-04
Number: SP-1688; Published: 2002-03-04
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