ESTIMATION OF DIESEL SOOT PARTICLES IN EXHAUST GAS EMISSION AND ITS ACCUMULATION IN DIESEL PARTICULATE FILTER USING GRAPHICAL CALCULATION MODEL

To avoid frequent regeneration intervals leading to expeditious ageing of the catalyst and substantial fuel penalty for the driver, it is always desired to estimate the soot coming from diesel exhaust emission and the soot accumulated and burnt in the diesel particulate filter. Certain applications and vehicle duty cycle cannot make use of the Delta pressure sensor for estimating the soot loading in the DPF because of the limitations of the sensor tolerance and measurement accuracy. The Physical soot model is always active and hence a precise and more accurate model is preferred to calibrate & optimize the regeneration interval. This paper presents the approach to estimate the engine out soot and the accumulated soot in the DPF using a graphical calculation model. The tool reduces the effort of driving different duty cycles multiple times on the testbed and recurrent vehicle trips for data collection while calibrating the soot models, hence saving testbed cost, diesel cost and manpower efforts. Results were established over BSVI emission legislative cycles (WHTC) and vehicle duty cycles to ratify with the model generated data