Abstract
The In-Direct Injection (IDI) 2-Stroke CI engine with DME was proposed. The electrical controlled low-pressure injection system for gasoline engine was applied to prevent the leakage of DME. The engine performance was investigated to clarify the influence of cross-sectional area ratio of connecting passage of divided-chamber, the ignition timing and the engine speed on combustion process. The ignition could be accurately controlled by the injection timing with IDI combustion chamber and the early injection timing gave high maximum rate of heat release. The ignition timing of sub-chamber was earlier than that of main-chamber when the injection timing was advanced. When the small cross-sectional area of connecting passage of divided-chamber was applied, on high load condition, high brake thermal efficiency could be achieved because the strong swirl in sub-chamber was generated. At the high load and the engine speed 2000rpm, high brake thermal efficiency was obtained because the charging efficiency improved.
