In order to study the effect of oxygenated blended fuels on the diesel engine emissions and the low temperature oxidation and regeneration characteristics of a diesel oxidation catalyst(DOC) coupled catalytic diesel particulate filter(CDPF) aftertreatment system

a comparison of three oxygenated blended fuels and a pure diesel fuel was carried out on a 4-cylinder high pressure common rail diesel engine at an altitude of 1900 m. Study indicates that in the case of engine mapping(maximum torque conditions)

the power performance of running with 15% biodiesel/diesel fuel and 15% n-pentanol/diesel fuel

respectively is lower than the diesel fuel operation

while the thermal efficiency with 15% n-pentanol/diesel fuel operation is the highest

and the NOx emissions with 15% biodiesel/diesel fuel is slightly lower than the diesel fuel operation with a highest drop of 3.33%

while the NOx emissions from the 15% n-pentanol/diesel fuel operation is increased by up to 2.85%. As observed

under low load conditions

when using diesel fuel

the conversion efficiency of DOC+CDPF to CO is significantly higher than the 20% n-pentanol/diesel fuel operation by up to 96.8%

and only 36.9% is obtained when using 20% n-pentanol/diesel fuel. Under low speed and high load conditions

when using diesel fuel and 20% n-pentanol/diesel fuel

DOC has a significant effect on the increase of exhaust temperature with an average rise of 41.8 ℃ and 42.5 ℃

respectively. The use of 20% n-pentanol/diesel fuel will increase the back pressure of DOC+CDPF slowly

the highest back pressure is 6 kPa lower than the diesel fuel operation

and the average temperature at the rear end of DOC is increased by 10 ℃. The use of 20% n-pentanol/diesel fuel can effectively reduce particulate emissions and pressure difference of DOC+CDPF at high load

especially at low speed and high load.