In order to study the soot loading law and regeneration characteristics of diesel particulate filter(DPF) at different altitudes

experimental researches were conducted on a high pressure common rail diesel engine at two atmospheric pressures of 80kPa and 100kPa

including the world harmonized transient cycle(WHTC) emissions

DPF soot loading and pressure drop characteristics

and the temperature field and pressure drop characteristics in DPF regeneration. The results show that the DPF exhaust temperature and emissions data in plateau environment are higher than those in plain environment

and the exhaust flow and oxygen concentration are higher in plain environment than those in plateau environment. The pressure drop loss at high altitude increases rapidly at first and then slowly with the accumulation of soot. The regeneration temperature and altitude have influence on the DPF regeneration pressure drop

peak temperature of the carrier regeneration

radial and axial temperature gradients of the carrier regeneration and the regeneration time. The higher the regeneration temperature and the lower the altitude

the higher the DPF pressure drop; the higher the regeneration temperature and altitude

the higher the peak temperature of the carrier regeneration

and the larger the radial and axial temperature gradient of the carrier regeneration; the higher the regeneration temperature and the lower the altitude

the higher the DPF pressure drop when the regeneration takes place.