DME-LPG混合燃料のガスエンジンマイクロコージェネへの適応研究 : 第2報,エンジン制御方法(<特集>第14回動力・エネルギー技術シンポジウム)

概要

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DME (Dimethyl ether) has been investigated as a diesel fuel due to its high cetane number like light oil. As DME and LPG maintain almost the same characteristics, so that DME can be blended with LPG. LPG fueled small gas engine drives generator and heat pump system. However, the lower auto ignition temperature of DME insists the lower knocking limit as compared to LPG. The first report of this research was investigated on knocking limit of DME and LPG mixture fuel in a natural aspirated small spark ignition gas engine that is used for micro cogeneration system. The test result showed that the knocking limit using DME blended fuel could be improved by retarded ignition timing and changing A/F ratio with the limit of blend ratio less than 30%. Second report presented that the engine controller could estimate the DME ratio from UEGO signal and A/F ratio feedback. When fuel changing from LPG (0%DME) to DME30%, BMEP was kept constant by controlling A/F ratio and ignition timing for 10kW micro-cogeneration system.
2010-03-25