Diesel Engine Transient Operation

Diesel Engine Transient Operation

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Traditionally, the study of internal combustion engines operation has focused on the steady-state performance. However, the daily driving schedule of automotive and truck engines is inherently related to unsteady conditions. In fact, only a very small portion of a vehiclea€™s operating pattern is true steady-state, e. g. , when cruising on a motorway. Moreover, the most critical conditions encountered by industrial or marine engines are met during transients too. Unfortunately, the transient operation of turbocharged diesel engines has been associated with slow acceleration rate, hence poor driveability, and overshoot in particulate, gaseous and noise emissions. Despite the relatively large number of published papers, this very important subject has been treated in the past scarcely and only segmentally as regards reference books. Merely two chapters, one in the book Turbocharging the Internal Combustion Engine by N. Watson and M. S. Janota (McMillan Press, 1982) and another one written by D. E. Winterbone in the book The Thermodynamics and Gas Dynamics of Internal Combustion Engines, Vol. II edited by J. H. Horlock and D. E. Winterbone (Clarendon Press, 1986) are dedicated to transient operation. Both books, now out of print, were published a long time ago. Then, it seems reasonable to try to expand on these pioneering works, taking into account the recent technological advances and particularly the global concern about environmental pollution, which has intensified the research on transient (diesel) engine operation, typically through the Transient Cycles certification of new vehicles.1190 TDC Steady-state operation Single-cylinder engine Speed 1180 rpm / 70% Load 0 90 180 270 360 450 540 630 720 Crank Angle (deg.) ... during steady- state, single-cylinder engine operation (simulation results) -2000 -1500 -1000 - 500 0 500 1000 1500 2000 2500 3000 3500 ... Owing to the a#39;internal inertiaa#39; of these a#39;processesa#39;, the respective torque peaks observed in the center sub- diagram of Figure 3.25 ... Here, lower maxima of crankshaft deformation are, overall, observed.

Title:Diesel Engine Transient Operation
Author:Constantine D. Rakopoulos, Evangelos G. Giakoumis
Publisher:Springer Science & Business Media - 2009-03-10


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