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Transient Diesel Emissions: Analysis of Engine Operation During a Tip-In

Transient Diesel Emissions: Analysis of Engine Operation During a Tip-In,Jonathan R. Hagena,Zoran S. Filipi,Dennis N. Assanis

Transient Diesel Emissions: Analysis of Engine Operation During a Tip-In   (Citations: 6)
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This study investigates the impact of transient engine operation on the emissions formed during a tip-in procedure. A medium-duty production V-8 diesel engine is used to conduct experiments in which the rate of pedal position change is varied. Highly-dynamic emissions instrumentation is implemented to provide real-time measurement of NOX and particulate. Engine subsystems are analyzed to understand their role in emissions formation. As the rate of pedal position change increases, the emissions of NOX and particulates are affected dramatically. An instantaneous load increase was found to produce peak NOX values 1.8 times higher and peak particulate concentrations an order of magnitude above levels corresponding to a five- second ramp-up. The results provide insight into relationship between driver aggressiveness and diesel emissions applicable to development of drive-by-wire systems. In addition, they provide direct guidance for devising low-emission strategies for hybrid vehicles. Hybrids offer more flexibility in controlling the engine, but optimizing their supervisory control for fuel economy can lead to frequent and sharp load increases that can contribute greatly to higher overall emissions levels. The characterization of transient effects on emissions can be applied towards shaping of tip-in functions for optimal economy-emissions tradeoff in hybrids.
Published in 2006.
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    • ...Quasi steady state models based on steady-state emission maps have been used in the literature for control-oriented modeling but they fail to capture transient soot accurately, especially the spikes during tip-in operations [2], [3], [4]...
    • ...density to mass, a relationship has been suggested by the manufacturer [3]...
    • ...At transient loads, accumulation mode also contributes to the particle formation of bigger diameters [3], [1]...

    Rahul Ahlawatet al. Volterra series estimation of transient soot emissions from a diesel e...

    • ...The study of exhaust emissions during transients – although of primary concern to engine manufacturers since newly produced engines must meet the stringent emission regulations following a legislated transient cycle – has been dealt with so far mainly on an experimental basis (Kang and Farell, 2005; Hagena, Filipi and Assanis, 2006)...
    • ...On the other hand, approximations using quasi-linear models that are based on steady-state engine performance fail to predict accurately exhaust emissions during transients, especially so for the turbocharger lag cycles (Hagena, Filipi and Assanis, 2006), since no actual modelling of the relevant off-design phenomena is included...
    • ...On the other hand, the injection pressure and exhaust pressure history play a secondary, but non-negligible role (Hagena, Filipi and Assanis, 2006)...

    C. D. Rakopouloset al. Exhaust emissions estimation during transient turbocharged diesel engi...

    • ... the calibration [6, 7]. Engine operating points, during the transient period before their steady-state value is reached, are associated with different Brake-Specific Fuel Consumption (BSFC) values, depending on the directions from which they have been arrived, as illustrated qualitatively in Figures 1 and 2. Pollutant emissions such as NOx, and particulate matters, demonstrate the same qualitative behavior, as shown by Hagena et al. [8]...

    Andreas A. Malikopouloset al. A LEARNING ALGORITHM FOR OPTIMAL INTERNAL COMBUSTION ENGINE CALIBRATIO...

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