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Smooth In-Cylinder Lean-Rich Combustion Switching Control for Diesel Engine Exhaust-Treatment System Regenerations
ISSN: 1946-4614, e-ISSN: 1946-4622
Published April 14, 2008 by SAE International in United States
Citation: Wang, J., "Smooth In-Cylinder Lean-Rich Combustion Switching Control for Diesel Engine Exhaust-Treatment System Regenerations," SAE Int. J. Passeng. Cars - Electron. Electr. Syst. 1(1):340-348, 2009, https://doi.org/10.4271/2008-01-0979.
This paper describes an in-cylinder lean-rich combustion (no-post-injection for rich) switching control approach for modern diesel engines equipped with exhaust-treatment systems. No-post-injection rich combustion is desirable for regeneration of engine exhaust-treatment systems thanks to its less fuel penalty compared with regeneration approaches using post-injections and / or in-exhaust injections. However, for vehicle applications, it is desirable to have driver-transparent exhaust-treatment system regenerations, which challenge the in-cylinder rich-lean combustion transitions. In this paper, a nonlinear in-cylinder condition control system combined with in-cylinder condition guided fueling control functions were developed to achieve smooth in-cylinder lean-rich switching control at both steady-state and transient operation. The performance of the control system is evaluated on a modern light-duty diesel engine (G9T600). Experimental results show significant merits of the proposed control system compared against the results obtained by conventional calibration-based approaches in terms of smoothness of engine torque responses during lean-rich transitions.