Abstract
In this study, the emission gases of diesel engine were evaluated by changing intake valve close timing (IVS) in a single cylinder DI diesel engine which is installed digital hydraulic variable valve actuation system. Moreover, when the effective compression ratio is made almost equal at compression ratio (ε=14,16,18) by adjusting IVC, the influence of low ε and high ε on the exhaust emission, fuel consumption and operating load of premixed compression ignition combustion was examined. As a result of experiment, it is found that low ε is effective to raise operating load and the operating load of high ε is limited at low level due to the increase of Smoke.
