Managing transient behaviors of a dual mode spark ignition-- controlled auto ignition engine with a variable valve timing system
Thesis (Ph. D.)--Massachusetts Institute of Technology, Dept. of Mechanical Engineering, February 2005.
| Main Author: | |
|---|---|
| Other Authors: | |
| Format: | Thesis |
| Language: | eng |
| Published: |
Massachusetts Institute of Technology
2006
|
| Subjects: | |
| Online Access: | http://hdl.handle.net/1721.1/30344 |
| _version_ | 1826218174331224064 |
|---|---|
| author | Santoso, Halim G. (Halim Gustiono), 1975- |
| author2 | Wai K. Cheng. |
| author_facet | Wai K. Cheng. Santoso, Halim G. (Halim Gustiono), 1975- |
| author_sort | Santoso, Halim G. (Halim Gustiono), 1975- |
| collection | MIT |
| description | Thesis (Ph. D.)--Massachusetts Institute of Technology, Dept. of Mechanical Engineering, February 2005. |
| first_indexed | 2024-09-23T17:15:38Z |
| format | Thesis |
| id | mit-1721.1/30344 |
| institution | Massachusetts Institute of Technology |
| language | eng |
| last_indexed | 2024-09-23T17:15:38Z |
| publishDate | 2006 |
| publisher | Massachusetts Institute of Technology |
| record_format | dspace |
| spelling | mit-1721.1/303442019-04-12T21:43:40Z Managing transient behaviors of a dual mode spark ignition-- controlled auto ignition engine with a variable valve timing system Santoso, Halim G. (Halim Gustiono), 1975- Wai K. Cheng. Massachusetts Institute of Technology. Dept. of Mechanical Engineering. Massachusetts Institute of Technology. Dept. of Mechanical Engineering. Mechanical Engineering. Thesis (Ph. D.)--Massachusetts Institute of Technology, Dept. of Mechanical Engineering, February 2005. "December 2004." Includes bibliographical references (p. 127-130). 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. (cont.) A simple open loop controller based on linear interpolation of fuel injection and valve timing events was implemented to assess the time scale required to avoid misfires during large load perturbation. Mode transition from the SI to CAI regime may be categorized as failed, non-robust, and robust. In a failed transition, the engine would not reach steady state CAI combustion. In a non-robust transition, one or more intended CAI cycles misfire, although the cycles progress to a satisfactory CAI operating after a few cycles. In robust transition, every intended CAI cycle is successful. A mode transition strategy based on late IVC and fuel metering strategy has been proposed. Smooth and robust modes transitions both from SI to CAI and vice versa have been experimentally demonstrated by implementing this strategy. by Halim G. Santoso. Ph.D. 2006-03-24T18:42:15Z 2006-03-24T18:42:15Z 2005 Thesis http://hdl.handle.net/1721.1/30344 61134217 eng 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. http://dspace.mit.edu/handle/1721.1/7582 130 p. 6726564 bytes 6743266 bytes application/pdf application/pdf application/pdf Massachusetts Institute of Technology |
| spellingShingle | Mechanical Engineering. Santoso, Halim G. (Halim Gustiono), 1975- Managing transient behaviors of a dual mode spark ignition-- controlled auto ignition engine with a variable valve timing system |
| title | Managing transient behaviors of a dual mode spark ignition-- controlled auto ignition engine with a variable valve timing system |
| title_full | Managing transient behaviors of a dual mode spark ignition-- controlled auto ignition engine with a variable valve timing system |
| title_fullStr | Managing transient behaviors of a dual mode spark ignition-- controlled auto ignition engine with a variable valve timing system |
| title_full_unstemmed | Managing transient behaviors of a dual mode spark ignition-- controlled auto ignition engine with a variable valve timing system |
| title_short | Managing transient behaviors of a dual mode spark ignition-- controlled auto ignition engine with a variable valve timing system |
| title_sort | managing transient behaviors of a dual mode spark ignition controlled auto ignition engine with a variable valve timing system |
| topic | Mechanical Engineering. |
| url | http://hdl.handle.net/1721.1/30344 |
| work_keys_str_mv | AT santosohalimghalimgustiono1975 managingtransientbehaviorsofadualmodesparkignitioncontrolledautoignitionenginewithavariablevalvetimingsystem |