Sequential updating of conditional probabilities on directed graphical structures
LNT requires frequent regeneration via rich engine combustion, which can cause a fuel penalty by up to 3%.In this study, a non-uniform cylinder-to-cylinder combustion (NUCCC) strategy and a cost-effective TWC-LNT system with a new architecture, were proposed to reduce the fuel penalty associated with LNT regeneration.
Its tracking performance under bounded measurement noise is evaluated.The major control problem is to properly design the ammonia dosing strategy that can efficiently remove NOx without generating excessive NH3 slip at the tailpipe.While most existing methods only utilize sensor feedback information to design controllers, the SCR controller performance can be improved by incorporating preview of road information such that the controller can act in a proactive fashion and reduce emissions over the whole trip.Abstract: Meeting the stringent EPA Tier 3 emission standards has been one of the main challenges towards the commercialization of highly-efficient lean-burn gasoline engines in the United States.One of the potential aftertreatment solutions is three-way catalyst (TWC) coupled with lean NOx trap (LNT).Comparison results under the US06 test cycle are presented to demonstrate the efficiency improvement of the proposed controller.
Abstract: A non-intuitive aspect of the transient management of a waste energy recovery (WER) system on a small turbocharged gasoline engine is presented in this work.
Abstract: In this paper we develop an indirect adaptive control architecture for gasoline engine emission control.
A model-based PID feedback controller is presented where its calibration amounts to finding the parameters of a simple catalyst model consisting of a gain and time delay, followed by an integrator.
The air-to-fuel equivalence ratios for different cylinders were optimized using genetic algorithm.
The proposed NUCCC strategy and new TWC-LNT system were verified over a simplified FTP-72 cycle in simulation.
The WER system is realized with a positive displacement expander and an electric motor, named exhaust turbo generating (ETG) system.