Paper Info
Title
Non-Uniform Combustion Based Mode Switching Control For A Passive Scr System
Abstract
Lean combustion is a promising technology for gasoline engines to achieve high engine efficiency due to reduced pumping loss during part-load operations. Cost-effective NOx emission control solutions are required for successfully commercialization of lean burn gasoline engines in the U. S. market. Passive selective catalytic reduction (SCR), which utilizes a close-coupled three-way catalyst (TWC) for on-board ammonia (NH3) production during rich engine operation, has demonstrated high NOx reduction efficiency without significant fuel penalty. However, passive SCR requires intermittent rich mode operation for NH3 generation. The mode switching transition may cause excessive noise, misfire, torque fluctuations, and NOx emission spikes. The main purpose of this study is to reduce the mode switching events and fuel penalty incurred by passive SCR operation using an innovative non-uniform cylinder-to-cylinder combustion (NUCCC) strategy. Model-predictive control (MPC) method is applied for optimizing the mode switching timing of individual cylinders to minimize the fuel penalty associated with passive SCR operation. Simulation results over a simplified UDDS cycle demonstrate that the MPC-based NUCCC strategy can reduce the number of switching events and the fuel penalty by 41.18% and 3.40%, respectively, compared to a uniform cylinder-to-cylinder combustion (UCCC) strategy. Such a novel engine combustion strategy can be very instrumental in improving the engine combustion quality, drivability, fuel efficiency and emissions for passenger vehicles equipped with passive SCR systems.
Year
Venue
Field
2018
2018 ANNUAL AMERICAN CONTROL CONFERENCE (ACC)
Gasoline,Combustion,NOx,Cylinder (engine),Torque,Engine efficiency,Control theory,Computer science,Lean burn,Fuel efficiency
DocType
ISSN
Citations 
Conference
0743-1619
0
PageRank 
References 
Authors
0.34
0
2
Name
Order
Citations
PageRank
Qinghua Lin102.03
Pingen Chen2104.18