An experiment study of homogeneous charge compression ignition combustion and emission in a gasoline engine

Homogenous charge compression ignition (HCCI) technology has exhibited high potential to reduce fuel consumption and NOx emissions over normal spark ignition engines significantly. Optimized kinetic process (OKP) technology is implemented to realize HCCI combustion in a port fuel injection gasoline...

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Bibliographic Details
Published in:Thermal science 2014, Vol.18 (1), p.295-306
Main Authors: Zhang, Jianyong, Li, Zhongzhao, Zhang, Kaiqiang, Zhu, Lei, Huang, Zhen
Format: Article
Language:English
Subjects:
Air temperature
Ambient temperature
Combustion
Emission analysis
Emissions control
Exhaust gases
Fuel injection
Gasoline engines
Heat release rate
Nitrogen oxides
Spark ignition
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Summary:Homogenous charge compression ignition (HCCI) technology has exhibited high potential to reduce fuel consumption and NOx emissions over normal spark ignition engines significantly. Optimized kinetic process (OKP) technology is implemented to realize HCCI combustion in a port fuel injection gasoline engine. The combustion and emission characteristics are investigated with variation of intake air temperature, exhaust gas recirculation (EGR) rate and intake air pressure. The results show that intake air temperature has great influence on HCCI combustion characteristic. Increased intake air temperature results in advance combustion phase, shorten combustion duration, and lower indicated mean effective pressure (IMEP). Increased EGR rate retards combustion start phase and prolongs combustion duration, while maximum pressure rising rate and NOx emission are reduced with increase of EGR rate. In the condition with constant fuel flow quantity, increased air pressure leads to retarded combustion phase and lower pressure rising rate, which will reduce the engine knocking tendency. In the condition with constant air fuel ratio condition, fuel injection quantity increases as intake air pressure increases, which lead to high heat release rate and high emission level. The optimal intake air temperature varies in different operating area, which can be tuned from ambient temperature to 220? by heat management system. The combination of EGR and air boost technology could expand operating area of HCCI engine, which improve indicated mean effective pressure from maximum 510kPa to 720kPa. nema
ISSN:0354-9836
2334-7163
DOI:10.2298/TSCI130416009Z