Abstract
Abstract Experimental study was conducted to investigate the effect of EGR(exhaust gas recirculation) on engine noise using singlecylinder combustion ignition engine. Under constant engine rotary speed of 1200 RPM, 8 mg fuel quantity was injected with15, 18 and 21% of oxygen ratio and 1400 bar of injection pressure. Using the in-cylinder pressure data acquired by a piezo-electric transducer, the engine performance parameters were calculated. Radiated engine noise measured for 10 seconds wasanalyzed using spectral characteristics and sound quality metrics such as loudness, sharpness, roughness. From the obtainedengine performance parameters and sound quality metrics, effect of oxygen ratio of the premixed air, start of injection timingon frequency characteristic and sound quality metrics were analyzed. Correlation analysis was conducted betweenMPRR(maximum pressure rise rate), RI(ringing intensity) and sound quality metrics. RI was identified as the most importantfactor having influence on the sound quality metrics.
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