Research on exhaust particle emissions of two direct injection gasoline engines during cold start

Research tested on two direct-injection gasoline engines during cold start process for changing the history of the particle emission, results turns out: gasoline direct injection mixture formation methods have a greater impact on particle emissions during start, inducing the formation of the wall of the mixture of small particles formed in the exhaust than the mixed gas intake air guide way higher than one order of magnitude. For direct injection gasoline engine in the early start will result in higher peak concentration of particles, about four times the idle condition particle concentrations. Coolant temperature is low also during starting density of particle emissions will increase, cold start particle emissions reached a peak about four times than warm start as high at idle about twice. No significant impact on particle number on 1.4TSI direct injection gasoline engine fueled with three different fuels.