Emissions Response of a European Specification Direct-Injection Gasoline Vehicle to a Fuels Matrix Incorporating Independent Variations in Both Compositional and Distillation Parameters

An emissions programme has been undertaken to gain information on the effect of selected fuel parameters on gasoline direct injection (G-DI) vehicle technology⁽¹⁾ with respect to exhaust emissions. Seven fuel parameters, namely aromatic, methyl-tertiary-butyl ether (MTBE), sulphur and olefin content as well as 3 distillation parameters covering the whole boiling range, were independently investigated. It was found that, overall, the fuel effects on regulated (THC, CO, NOx), particulate (Pm), and CO₂ emissions were relatively small.