Abstract
It is known, actually, to compliance with the pollution standards EURO 5 and EURO 6, car engines are equipped with depollution systems based on exhaust gas post-treatment. The DPF (Diesel Particulate Filter) is an indispensable element in the chain of the post-treatment activity. Its optimal functioning involves the determination of the filtration efficiency, meaning the retention level of mechanical particles, after which the regeneration is required. The paper aims to model mathematically the filtration process specific to DPF and to establish with experimental research the filtration efficiency at the point of achieving the necessary conditions for regeneration, meaning the point where the efficiency of regeneration is equal to the oxidation level of mechanical particles. There have been investigated a number of eight functional modes of the engine and every mode of operation at a different speed movement. The filtration efficiency has been determined at different pressures measured in the exhaust stream of a diesel engine. There are also presented the curves of filtration izoefficiency and the curves of izoconcentrations for exhaust gas and other products of combustion. The method proposed by the authors can be used in the activity of optimal functioning of the depollution system with the engine.
Keywords: Diesel Particulate Filter, Filtration Efficiency, Regeneration