직접구동 피에조 인젝터의 CRDi 단기통 디젤엔진 연소 특성 분석

초록

In this study, experimental approaching method was applied under and single-cylinder engine to researchthe performance of direct needle-driven piezo injector (DPI) for CR direct-injection. As key-point factor of this DPI thatrelies on direct-acting operating of injector needle, unlike conventional hydraulic-servo, its nozzle needle can bedirectly driven by piezo actuator. Thus, effect of direct-acting injection of DPI on diesel combustion and emissioncharacteristics was investigated under common-rail single-cylinder direct-injection engine, equipped with threedifferent driving mechanism, including indirect-acting solenoid, piezo and DPI system. As main results, it found that adirect-acting piezo injector has higher of IMEP. And it has higher heat release rate during premixed combustion andmixing controlled combustion phase due to its higher heat release, even though nitrogen oxide (NOx) formations wereincreased slightly.

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