Abstract
Real-time estimation of soot mass loading on diesel particulate filters (DPF) is essential to assure perfect and fuel-efficient regeneration. Computer models based on the pressure drop across the DPF are installed in the engine control unit to estimate the soot mass loading, but this approach is still subject to uncertainty for the lack of resources available. This study is intended to develop a portable instrument that can make real-time measurements of soot mass loading under transient mode for calibrating the models. The instrument is based on the light scattering technique and the intensity of scattered light from soot particles is reduced to soot mass concentration using a calibration data obtained under steady engine operating conditions. It is demonstrated that the prototype instrument can measure the temporal variations of cumulative soot mass and filtration efficiency of a DPF under transient modes.
