A New Assessment Method of Odorous Exhaust Gases at No Load and its Application in DI Diesel Engines

Abstract

Concerns about exhaust odor from DI diesel engines have increased in recent years. In this paer, sensual assessment for the odor and eye irritation of exhaust gases directly from engine exhaust and indirectly from sampling bags were performed. The HCHO in the exhaust was measured and found that it correlates with odor and eye irritation well. For the reduction of odorous emissions, the effects of injection timing, rate of EGR and engine speed on emissions were investigated. The injection timing of about 10°BTDC shows good results after and during engine warm-up. The effects of EGR on odorous emissions were also examined. The investigation shows that 30% EGR is the optimum rate of EGR for minimum odor and eye irritation. At higher engine speeds, the speed of assessed gas increases which may cause the deterioration of sensual assessment in the outdoor.