Design and Control Strategy of Universal SCR Reductant Injection System
Author(s): LIU Jia-wei, HAN Yong-qiang, HAN Xun-feng, ZHANG Zhong-bao, LV Dan-dan
Pages: 7-13
Year: 2014 Issue: 1
Journal: Vehicle Engine
Keyword: SCR; control strategy; self-learning; MAP;
Abstract: The universal SCR injection system was self-designed and its self-learning control strategy and algorithm were re-searched based on CA6DL2-35E3 diesel engine with high-pressure common rail and turbocharged intercooling .The structure of SCR system and the working process of urea auto-supplied device were introduced in detail .The MAPs of NOx emission ,SCR conversion efficiency ,ammonia-nitrogen ratio and urea injection quantity were acquired by the experiment and the MAP of re-ductant injection quantity was determined by self-learning control strategy .The self-learning control strategy and algorithm were compiled into C codes with the software of CodeWarrior .Finally ,the self-designed system and control algorithm were verified by bench test .The results show that the injection system can supply urea in time and keep pressure constant in the in-let .The self-learning control strategy and algorithm can realize the function of universal SCR system and meet the state-Ⅳ e-mission legislation .
Pages: 7-13
Year: 2014 Issue: 1
Journal: Vehicle Engine
Keyword: SCR; control strategy; self-learning; MAP;
Abstract: The universal SCR injection system was self-designed and its self-learning control strategy and algorithm were re-searched based on CA6DL2-35E3 diesel engine with high-pressure common rail and turbocharged intercooling .The structure of SCR system and the working process of urea auto-supplied device were introduced in detail .The MAPs of NOx emission ,SCR conversion efficiency ,ammonia-nitrogen ratio and urea injection quantity were acquired by the experiment and the MAP of re-ductant injection quantity was determined by self-learning control strategy .The self-learning control strategy and algorithm were compiled into C codes with the software of CodeWarrior .Finally ,the self-designed system and control algorithm were verified by bench test .The results show that the injection system can supply urea in time and keep pressure constant in the in-let .The self-learning control strategy and algorithm can realize the function of universal SCR system and meet the state-Ⅳ e-mission legislation .
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