Equivalence Ratio-EGR Control of HCCI Engine Operation and the Potential for Transition to Spark-Ignited Operation [electronic resource]
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),...
Saved in:
| Online Access: |
Online Access (via OSTI) |
|---|---|
| Corporate Author: | |
| Format: | Government Document Electronic eBook |
| Language: | English |
| Published: |
Washington, D.C. : Oak Ridge, Tenn. :
United States. Department of Energy ; distributed by the Office of Scientific and Technical Information, U.S. Department of Energy,
2001.
|
| Subjects: |
| Summary: | 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. |
|---|---|
| Item Description: | Published through SciTech Connect. 07/31/2001. "ucrl-jc-144871" 1 ISSN 0148--7191. Society of Automotive Engineers International Fall Fuels & Lubricants Meeting & Exhibition, San Antonio, TX (US), 09/24/2001--09/27/2001. Martinez-Frias, J; Aceves, S M; Flowers, D L; Smith, J R; Dibble, R. |
| Physical Description: | PDF-FILE: 12 ; SIZE: 0.7 MBYTES pages. |