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Removal of NOx sensor ammonia cross sensitivity from contaminated measurements in Diesel-engine selective catalytic reduction systems

机译：去除柴油机选择性催化还原系统中污染测量中的NOx传感器氨气交叉敏感性

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In this paper, we study the robust observer design problem for removal of NOx sensor ammonia cross-sensitivity from contaminated measurements in Diesel-engine selective catalytic reduction (SCR) systems via the mixed H-2/H-infinity approach. Due to the fact that the NOx sensor is cross-sensitive to gaseous ammonia, the reading of NOx sensor is contaminated severely by the ammonia concentration. Moreover, the cross-sensitivity factor is not constant but varying with respect to the temperature. As the real NOx concentration in the downstream tailpipe is useful for the closed-loop control or fault diagnosis, it is necessary and meaningful to estimate the actual value of NOx concentration and non-constant cross-sensitivity factor from the application perspective. Therefore, we aim to design an observer to achieve the objectives. To design the observer, it is assumed that the variation of cross-sensitivity factor is bounded and the bounds are known in advanced. This assumption is practical since the factor is non-negative and generally smaller than 2.5. With the assumption, a design approach for a robust gain-scheduling mixed H-2/H-infinity observer is proposed. The gain-scheduling strategy is adaptive to compensate for the existing nonlinearities and the involved time-varying parameters of the SCR model. At the end, simulations and comparisons via an experimentally-validated full vehicle simulator cX-Emission are carried out to show the efficacy and the advantages of proposed approach over the existing extended Kalman filter (EKF). (C) 2015 Elsevier Ltd. All rights reserved.
机译：在本文中，我们研究了鲁棒的观测器设计问题，该问题通过混合H-2 / H-无穷大方法从柴油机选择性催化还原（SCR）系统中的污染测量中去除NOx传感器氨的交叉敏感性。由于NOx传感器对气态氨具有交叉敏感性，因此NOx传感器的读数受到氨浓度的严重污染。而且，交叉敏感度因子不是恒定的而是相对于温度而变化的。由于下游排气管中的实际NOx浓度对于闭环控制或故障诊断很有用，因此从应用角度评估NOx浓度和非恒定交叉敏感系数的实际值是必要且有意义的。因此，我们旨在设计一个观察者以实现目标。为了设计观察者，假设交叉敏感度因子的变化是有界的，并且界限是预先已知的。由于该因子为非负数且通常小于2.5，因此此假设很实用。在此假设的基础上，提出了一种鲁棒的增益调度混合H-2 / H-无限观测器的设计方法。增益调度策略可自适应地补偿SCR模型的现有非线性和所涉及的时变参数。最后，通过经过实验验证的全车辆模拟器cX-Emission进行了仿真和比较，以显示所提出方法相对于现有扩展卡尔曼滤波器（EKF）的功效和优势。 （C）2015 Elsevier Ltd.保留所有权利。

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