Off-Cycle Emissions of Particle Number from Gasoline and DPF Diesel Passenger Cars in High-Load Conditions

To evaluate regulated gases and solid particle number (SPN) emissions in high-load off-cycle conditions, two diesel vehicles with a particulate filter (DPF) urea selective catalytic reduction (SCR) system, respectively, four gasoline port fuel injection (PFI) were tested the worldwide light-duty test cycle, including an extra-high (Ex-hi) phase. All developed for Japanese market did not comply Ex-hi exhibited higher CO2 phase than low, mid high phases. Increased NOx SPN10-23 observed DPF vehicle. These increased due to occurrence of passive regeneration DPF, SCR system was stopped as result. The small PFI cars showed CO SPN enrichment control, which occurred quite load operation condition. feature control differed from that warming-up process cold-start mode. SPN23 mainly process, whereas control. Hybrid seem have fewer opportunities show motor assist.