The effects of diesel fuel injection pressure on the combustion and emissions of a diesel/methanol dual fuel (DMDF) engine were studied on a turbocharged intercooled electronic-controlled common rail diesel engine. The results show that at lower diesel injection pressure

the cylinder pressure at the end of compression stroke in DMDF mode is lower than that in diesel mode

and it decreases considerably with the increase of methanol content in the dual fuel. However at higher injection pressure

the cylinder pressure reduction is smaller. The maximum cylinder pressure in DMDF mode with 20% of methanol is slightly higher than that in diesel mode

and the corresponding maximum heat release rate is significantly higher than that in diesel mode and that in DMDF mode with 40% of methanol. NOx emission in DMDF mode is reduced with an increase in methanol

but increased with a rise in diesel injection pressure when the methanol content remains constant. CO and THC emissions in DMDF mode are reduced slightly with the increase of diesel injection pressure

but increased almost linearly as methanol increases. At lower injection pressure

DMDF mode can reduce soot emission and can do more with the increase of methanol

the maximum reduction being up to about 35%. At other injection pressures

soot emission remains invariant with the increase of methanol.