The influence of methanol and methanol reformate on DISI engine performance was analyzed based on GT-Power the software coupled to the empirical formula of laminar flame speed with dual fuel operation. First using the empirical formula

and combustion duration were calculated successively when the engine was operating with gasoline-methanol and gasoline-methanol reformate respectively and then the calculated results were input into the combustion model to explore the influence of different mixing ratios on engine performance. Results show that compared with the direct blending of methanol

the use of methanol reformate can significantly improve thermal efficiency and torque output

reduce fuel consumption and maintain the same CO emissions

but will increase the NOx emissions especially under the lean burn conditions. This indicates that the fuel reforming has more potential to improve the thermal efficiency of GDISI engine than the direct blending of methanol.