Significant particulate emission reductions of diesel engines can be achieved using diesel particulate filters (DPFs). Ceramic wall flow filters with a PM efficiency of > 90 % have proven to be effective components in emission control, the challenge for the application lies with the development and adaptation of a reliable regeneration strategy. An essential aspect of such regeneration strategy development is the elimination of the so-called uncontrolled filter regenerations during engine idling or coasting conditions that could lead to DPF malfunction through excessive temperature exotherms resulting in either catalyst deactivation, ash sintering, or - as worst case - even filter destruction. DPF thermal management strategies are an integral part of filter regeneration management and allow for further optimization to enable integration of cost effective DPF products compared to today's filter systems on passenger cars. An automated DPF regeneration strategy is demonstrated at four engine operating points. The automated regeneration is actuated via suitable modifications of the engine control strategy using ECU bypass, which results in a desired exhaust temperature and lambda profile. The main engine control inputs used for the DPF regeneration are post injection quantity, post injection timing and EGR valve position via closed loop control of the air flow rate. These inputs are calibrated at the four engine operating points to achieve optimal conditions for the DPF regeneration. Proof of concept is demonstrated for the DPF thermal shock protection in the event of uncontrolled DPF regeneration arising from transition of the engine to idle from a high speed/load operating point.


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    Title :

    Regeneration-control - key to successful application of new DPF systems


    Additional title:

    Regenerationssteuerung - Schlüssel zur erfolgreichen Applikation neuer DPF-Systeme


    Contributors:


    Publication date :

    2004


    Size :

    17 Seiten, 15 Bilder, 2 Tabellen, 10 Quellen


    Type of media :

    Conference paper


    Type of material :

    Print


    Language :

    English




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