Effects of High Pressure Injection and Oxidation Catalyst on Exhaust Odor in DI Diesel Engines

摘要

This study investigated the effect of high pressure injection and an oxidation catalyst on the exhaust odor of DI diesel engines. At idling an injection pressure of 60-80 MPa resulted in the minimum exhaust odor, with the least baldheaded and minimum total hydrocarbon (THC). This is because of decreases in fuel adhering to the combustion chamber walls due to the shortest ignition delay at this pressure range. However, above 60 MPa there is no further shortening of the ignition delay And overleaning of the local mixture dominates at Injection pressures above 100 MPa, where the exhaust Odor increases again. The odor reduction at the optimum Injection pressure and injection timing is not significant, And further experiments with an oxidation catalyst were Performed.