A fully instrumented test bed installation has been developed in order to study the transient performance and emissions of an automotive/truck turbocharged diesel engine. Fast response analysers were employed for measuring NO, smoke opacity, and combustion noise emissions for a variety of acceleration tests experienced during daily driving conditions. Furthermore, a quasi-steady approximation was undertaken in order to highlight the completely different evolution pattern of transient conditions compared with steady-state operation. The basic conclusions derived from the current investigation, for the specific engine-hydraulic-brake configuration, can be summarized as follows. As expected, turbocharger lag was found to be the most notable contributor for all the examined transient test cases, and the major cause for high values of NO, smoke, and combustion noise emissions. Fuel limiter action, governing, turbocharger characteristics, engine injection timing calibration, and individual specifications of each test were found to strongly affect the speed response as well as the profile and cumulative values of all pollutants. Combustion noise is directly influenced by the incylinder pressure gradient, and may be affected by the specific engine calibration (for the particular engine this consists of retarded injection timing for the purpose of NO emission limitation). 4. Turbocharger lag effects were much less prominent during multi-step, or slow acceleration, resulting in much lower opacity spikes, NO and combustion noise emissions are also lower during such transients. 5. The rate of the accelerator pedal 'push' affected only the development profile of all operating parameters and emissions, with the final steady-state values being the same in both 'fast' and 'slow' modes. Also, a considerable difference in cumulative NO and soot mass was observed. 6. Load increases of an automotive engine on an uncontrolled test bench are strongly influenced by the 'loose' governing, leading to considerable speed drops and so affecting accordingly the whole system response and emissions development. 7. Transient emissions develop in a completely different manner compared with their steady-state counterparts, owing to the off-design phenomena experienced during dynamic engine operation. It is believed that the present study has contributed towards a deeper understanding of the complex phenomena experienced during diesel engine transient operation, particularly as regards NO, smoke, and combustion noise emissions development. It can form a basis for deeper research in this challenging field, extending into the investigation of complex transient events and legislated Transient Cycles.


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    Titel :

    Experimental study of transient nitric oxide, smoke, and combustion noise emissions during acceleration of an automotive turbocharged diesel engine


    Beteiligte:
    Rakopoulos, C.D. (Autor:in) / Dimaratos, A.M. (Autor:in) / Giakoumis, E.G. (Autor:in)


    Erscheinungsdatum :

    2011


    Format / Umfang :

    20 Seiten, 12 Bilder, 5 Tabellen, 42 Quellen



    Medientyp :

    Aufsatz (Zeitschrift)


    Format :

    Print


    Sprache :

    Englisch