Fore-aft oxygen storage control
Fore-aft oxygen storage control
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前后氧气储存控制
DOI：
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发表时间：
2002
期刊：
影响因子：
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通讯作者：
J. Grizzle
中科院分区：
文献类型：
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作者：
G. Fiengo;J. Cook;J. Grizzle
本文描述了基于模型的，主动控制的后处理系统的火花点火发动机配备了三效催化剂（TWC）和前和后TWC氧传感器。控制器设计用于管理TWC中的储氧水平，以最大化氮氧化物、NO/sub x/、未燃碳氢化合物、HC和一氧化碳、CO的同时转化效率。线性排气氧传感器（UEGO）用于测量催化剂前和后的A/F。假设催化剂前A/F测量值除了被零均值噪声破坏之外还被偏置，而假设催化剂后测量值仅被零均值噪声破坏。采用了串联控制器结构。上游控制器对扰动提供相对快速的响应，而下游控制器使用扩展卡尔曼滤波器（观测器）来估计相对氧气水平。然后，氧储存的估计值用于将TWC的相对氧水平调节到50%。所提出的控制系统的性能和鲁棒性，在面对噪声和模型的不确定性进行了评估，通过广泛的模拟。
This paper describes model-based, active control of an aftertreatment system for a spark ignition engine equipped with a three-way catalyst (TWC) and pre- and post-TWC oxygen sensors. A controller is designed to manage the oxygen storage level in the TWC in order to maximize the simultaneous conversion efficiencies of oxides of nitrogen, NO/sub x/, unburned hydrocarbons, HC, and carbon monoxide, CO. Linear exhaust gas oxygen sensors (UEGOs) are used to measure pre- and post-catalyst A/F. The pre-catalyst A/F measurement is assumed to be biased in addition to being corrupted by zero-mean noise, while the post-catalyst measurement is assumed to be only corrupted by zero-mean noise. A series controller configuration is adopted. The upstream controller provides relatively rapid response to disturbances, while the downstream controller uses an extended Kalman filter (observer) to estimate the relative oxygen level. The estimated value of oxygen storage is then used to regulate the relative oxygen level of the TWC to 50%. The performance and robustness of the proposed control system in the face of noise and model uncertainty are evaluated through extensive simulations.