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Extension of Low Load Operational Limit of a Gasoline HCCI Engine Using the Blow-Down Super Chare System
Technical Paper
2010-08-0142
Sector:
Event:
JSAE Spring Conference
Language:
Japanese
Abstract
The objective of this study is to extend the HCCI operational range. To realize a stable low load HCCI operation using the Blow-Down Super Charge (BDSC) system, a new strategy of the valve timings which can increase in-cylinder temperature without decreasing the fuel concentration at low load operation was proposed and experimentally examined. Also, the effect of coolant water temperature on the in-cylinder gas temperature and combustion stability was experimentally investigated. As a result, it is found that stable low load HCCI operation was successfully obtained using the proposed valve timings with the BDSC system. A higher coolant water temperature caused lower COV of IMEP at very low load HCCI operation. 134 kPa of IMEP could be realized using the proposed valve timing strategy.