Control strategy research of a selective catalytic reduction system for heavy-duty application |
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Authors: | Tiantian Wang Feng Lin Jie Hu Yuqiang Ke Yueqiu Zhang |
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Affiliation: | 1.Hubei Key Laboratory of Advanced Technology for Automotive Components & Hubei Collaborative Innovation Center for Automotive Components Technology,Wuhan University of Technology,Wuhan,China;2.Dongfeng Liuzhou Motor Co. Ltd.,Liuzhou, Guangxi,China;3.Beijing Municipal Vehicle Emission Management Center,Beijing,China |
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Abstract: | An AdBlue dosing control strategy of the selective catalytic reduction(SCR) system is developed for a heavy-duty diesel(HDD) engine. The strategy includes a raw emission prediction model, an ammonia(NH_3)coverage prediction model, a transient heat hysteresis correction algorithm, an NH_3 leakage control model for transient operation conditions, and a feedback controller(FBC). FBC has been developed by using mathematical manipulation to change output signal of sensor based on cross-sensitivity of nitrogen oxide(NO_x) sensor to NH_3.The quantification of control parameters is based on experiments and Nyquist stability criterion. FBC is enabled in most test conditions to satisfy the stability requirements. NOxconversion(DeNO_x) efficiency of SCR system is 82.4% in European steady-state cycle(ESC) test and 80.3% in European transient cycle(ETC) test, while the leakage of NH_3 is under 10-5 volume fraction in average. |
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