Experimental study the effect of injection strategies on combustion and emission characteristics in gasoline compression ignition engines using gasoline/hydrogenated catalytic biodiesel blends

•Double injection strategies can solve PRRmax problem for G70H30 and G80H20 in a GCI engine.•−50 °C aTDC pilot SOI with 30% pilot ratio is recommended.•Advancing the pilot SOI can get lower NOx and PM emissions simultaneously.•The PM is effected by pilot SOI timing while NOx is influenced by pilot ratio.