科研之友
微信
新浪微博
Facebook
分享链接
摘要
Since the NOx sensor is cross-sensitive to gaseous ammonia, the reading of NOx sensor may not be accurate when the gaseous ammonia is involved and it is a combination of the actual NOx concentration plus the ammonia concentration multiplied by a factor. The factor is named as NOx sensor cross-sensitivity factor. As the reading is inaccurate, this cross-sensitivity phenomenon restricts the application of NOx sensor in the selective catalytic reduction (SCR) system. A practical and economic approach is to design an observer to estimate the cross-sensitivity factor and correct the NOx sensor reading. In this work, the NOx sensor ammonia-cross-sensitivity factor observer design problem for diesel engine SCR systems is investigated. To achieve the objective, first, a three-state nonlinear model for the SCR system is adopted. To establish the model of the ammonia cross-sensitivity factor, it is assumed that the qth-order derivative of the factor is zero. Then, based on the nonlinear model, a proportional-multiple-integral (PMI) observer of the factor is proposed and a nonlinear estimation error system is obtained. With the linear-parameter-varying (LPV) technique, the stability, and the H-infinity performance of the nonlinear estimation error system are investigated. Based on the analysis results, the design methods of the stable and the H-infinity observer gains are developed. At the end, simulations and comparisons via an experimentally validated full vehicle simulator are carried out to illustrate the efficacy and the advantages of the proposed approach over the existing methods. Since the effect of disturbance to the estimation is considered and constrained in the H-infinity observer, the designed H-infinity observer has a better estimation performance when the system is subject to disturbance.
- 出版日期2015-6
- 单位上海海事大学
