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    • 葛晓成,李静波,陈本林,等.当量燃烧天然气发动机NH3排放控制策略研究[J].内燃机工程,2021,42(3):86-92.
    Research of NH3 Emission Control Strategy for Equivalent Combustion Natural Gas Engine
    DOI：10.13949/j.cnki.nrjgc.2021.03.013
    Key Words:China VI Emission Standards  natural gas engine  equivalent combustion  ASC post-processing  NH3 emission
    Author NameAffiliationE-mail
    GE Xiaocheng School of Automotive Engineering,Chongqing University gexiaocheng@caeri.com.cn 
    LI Jingbo China National Gas Vehicle Engineering Research Center,China Automotive Engineering Research Institute  
    CHEN Benlin China National Gas Vehicle Engineering Research Center,China Automotive Engineering Research Institute  
    WANG Guohua China National Gas Vehicle Engineering Research Center,China Automotive Engineering Research Institute  
    XU Zhongming School of Automotive Engineering,Chongqing University  
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    Abstract:In order to meet the new NH3 emission limits of China VI Emission Standards, a “slightly-rich air-fuel ratio and Ammonia Slip CatalystASC (ASC)” control strategy is developed and applied in this paper, which is based on NH3 emission generation mechanism and a large amount of engineering test data. Besides, a matching development test is carried out on a certain natural gas engine, which is proved to meet the requirements of the China VI Emission Standards. The test results show that: 1) NH3 emissions are derived from the catalytic converter, not from the original emissions of natural gas engines. 2) ASC using 0.177×10-3g/cm35g/ft3 precious metal content can achieve 72.2% conversion efficiency. By increasing the content of precious metals, the conversion efficiency has no great changes. 3) After post-processing of ASC with 0.177×10-3g/cm35g/ft3 precious metal content, NH3 emission reaches the lowest level with Air-fuel ratio being 0.996, which is lower than the standards.
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