Managing transient behaviors of a dual mode spark ignition-- controlled auto ignition engine with a variable valve timing system

Gasoline Homogeneous Charge Compression Ignition (HCCI) engine has the potential of providing better fuel economy and emissions characteristics than current spark ignition engines. One implementation of this technology employs a Variable Valve Timing (VVT) system and is also often referred to as Controlled Auto Ignition (CAI) combustion in the literature. The objective of the study can be divided into two topics. First, the dynamic nature of load trajectory and several important phenomena in CAI mode were investigated. Second, the issues encountered during mode transition between SI and CAI regime were considered. Despite wide-open-throttle operation, pumping loss in CAI mode was not negligible. A major source of pumping loss in CAI mode was the heat transfer to cylinder wall during the recompression process due to the high in-cylinder residual gas temperature. The influence of fuel air equivalence ratio on combustion stability was analyzed to explain the misfires phenomenon in fuel rich condition during transient operation. Heat release analysis has been conducted to characterize the combustion process in CAI mode. Large variations of the 50% burned point due to fluctuation of residual gas mass and temperature were observed. Small step changes in valve timings (EVC, EVO, and IVC) and fueling resulted in a new steady state within 3-4 engine cycles at 1500 rpm. These small step changes are reversible in nature. Sudden large step change in load required much longer time to reach steady state due to the time required for thermal stabilization. Misfires were observed in large low-load-to-high-load step change but not in high-load-to-low-load step change.

Department dc:contributor.department

Massachusetts Institute of Technology. Dept. of Mechanical Engineering.

Grantor dc:publisher

Massachusetts Institute of Technology

Year dc:date.issued

2005

Author dc:creator

• Santoso, Halim G. (Halim Gustiono), 1975-

Advisor dc:contributor.advisor

• Wai K. Cheng.

• Mechanical Engineering.

Statement dc:rights

• M.I.T. theses are protected by copyright. They may be viewed from this source for any purpose, but reproduction or distribution in any format is prohibited without written permission. See provided URL for inquiries about permission.

Licence dc:rights.uri

• http://dspace.mit.edu/handle/1721.1/7582

Language dc:language.iso

eng

Handle dc:identifier.uri

http://hdl.handle.net/1721.1/30344

OAI identifier oai:identifier

oai:dspace.mit.edu:1721.1/30344