The effect of different gasoline surrogate components on vehicle performance was investigated in an in-cylinder direct injection vehicle and a port injection vehicle respectively. Three gasoline surrogates with same octane number

including n-heptane/iso-octane

n-heptane/iso-octane/toluene and n-heptane/iso-octane/diisobutylene blends

were used during the test. Test results show that the addition of toluene leads to an increase in CO2 emissions

while the use of diisobutylene shows an opposite trend. However

both of them reduce fuel consumption. At the same time

the addition of either of them increases CO emissions from the in-cylinder direct injection vehicle coupled to the reduction of THC emissions

and it increases the transient CO and THC emissions from the port injection vehicle during the first 100 s of the New European Driving Cycle. In addition

the use of diisobutylene causes NOx emissions to decrease

while toluene increases NOx emissions. In terms of particulate matter emissions

the addition of toluene increases particulate mass and particle number emissions from the in-cylinder direct injection vehicle

and the use of diisobutylene produces exactly an opposite result. Although adding toluene or diisobutylene reduces particulate mass emissions from the port injection vehicle

it leads to an increase in particle number emissions. As for acceleration performance

adding toluene or diisobutylene shortens the acceleration time of the in-cylinder direct injection vehicle

but using toluene will increase the acceleration time of the port injection vehicle.