3개 구동방식(SI, PI, DPI)별 디젤HEV용 인젝터의 분무 특성 비교

초록

Performance of DI diesel engine with high-pressure fuel injection equipment is directly related to its emission characteristicsand fuel consumption. So, the electro-hydraulic injector for the common-rail injection system should be designed tomeet the precise high fuel delivery control capability. Currently, most high pressure injector in use has a needle driven bythe solenoid coil energy or the piezo actuator controlled by charge-discharge of output pulse current. In this study, macroscopicspray approaching method was applied under constant volume chamber to research the performance of three differentinjectors : solenoid, indirect-acting piezo and direct-acting piezo type for CR direct-injection. LED back illumination for Miescattering was applied on the liquid spray visible of direct-acting piezo injector, including hydraulic-servo type solenoid andpiezo-driven injectors. As main results, we found that a direct-acting piezo injector had better a spray tip penetration thanhydraulic-servo injectors in spray visualization.

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