Article(id=1314922093658071720, tenantId=1146029695717560320, journalId=1234093305789726721, issueId=1314921940238828053, articleNumber=null, orderNo=null, doi=null, pmid=null, cstr=null, oa=null, hot=null, price=null, onlineType=0, articleFormat=0, articleType=null, articleTypeStr=null, receivedDate=1749916800000, receivedDateStr=2025-06-15, revisedDate=null, revisedDateStr=null, acceptedDate=null, acceptedDateStr=null, onlineDate=1791431457198, onlineDateStr=2026-10-08, pubDate=1768838400000, pubDateStr=2026-01-20, doiRegisterDate=null, doiRegisterDateStr=null, onlineIssueDate=1791431457198, onlineIssueDateStr=2026-10-08, onlineJustAcceptDate=null, onlineJustAcceptDateStr=null, onlineFirstDate=null, onlineFirstDateStr=null, sourceXml=null, magXml=null, createTime=1791431457198, creator=13701087609, updateTime=1791431457198, updator=13701087609, issue=Issue{id=1314921940238828053, tenantId=1146029695717560320, journalId=1234093305789726721, year='2026', volume='46', issue='1', pageStart='1', pageEnd='592', issueExtLink='null', onlineDate='null', pubDate='1768838400000', pubDateStr='2026-01-20', beforeIssueId=null, nextIssueId=null, price=null, status=1, issueComplete=1, articleOrder=1, issueType=-1, specialIssue=null, createTime=1791431420621, creator='13701087609', updateTime=1791431552947, updator='13701087609', preIssue=null, nextIssue=null, articleTotal=null, ext={EN=IssueExt(id=1314922495317210104, tenantId=1146029695717560320, journalId=1234093305789726721, issueId=1314921940238828053, language=EN, specialIssueTitle=, coverIllustrator=null, specialIssueEditor=, specialIssueAbout=), CN=IssueExt(id=1314922495317210105, tenantId=1146029695717560320, journalId=1234093305789726721, issueId=1314921940238828053, language=CN, specialIssueTitle=, coverIllustrator=null, specialIssueEditor=, specialIssueAbout=)}, issueFiles=null, downloadFileDto=null}, startPage=91, endPage=100, ext={EN=ArticleExt(id=1314922095604228777, articleId=1314922093658071720, tenantId=1146029695717560320, journalId=1234093305789726721, language=EN, title=Analysis of NO_x and NH₃ emission characteristics from heavy-duty diesel vehicles under cold and hot start conditions in the summer, columnId=1234106386020365051, journalTitle=China Environmental Science, columnName=Air Pollution Control, runingTitle=null, highlight=null, articleAbstract=

This study investigated cold and hot start processes of diesel vehicles under different load conditions in summer using a heavy-duty chassis dynamometer, with a focus on analyzing NO_x and NH₃ emission characteristics and influencing factors. The results showed that during cold starts, the exhaust gas temperature and coolant temperature rose slowly, and the NO_x sensor was delayed in activation, with over 82% of NO_x emissions occurring before the sensor became operational. During hot starts, the SCR system and sensor entered operation rapidly due to higher system temperatures, leading to significantly lower NO_x emissions. NH₃ emissions were significantly affected by the start condition and simulated load. In the initial phase of cold starts, the NH₃ emission factor was higher than average because of low SCR temperatures. During hot starts, rapid urea hydrolysis without sufficient reaction with NO_x resulted in increased NH₃ emissions. Micro-scale operational modal analysis revealed that the difference in NO_x emissions was mainly determined by engine and SCR temperatures, whereas the difference in NH₃ emissions was associated with SCR temperature and urea injection quantity. The study emphasizes the need to address pollutant emissions during summer cold-start processes and proposes synergistic optimization of temperature control and SCR urea injection strategies to reduce the environmental impact.

, authors=Qian FENG¹, Xiu-e SHEN¹, Yang LU¹, Peng-rui WANG¹, Yan-qing ZHOU¹, Yan-yan YANG^{1, 2, *}, authorsList=Qian FENG, Xiu-e SHEN, Yang LU, Peng-rui WANG, Yan-qing ZHOU, Yan-yan YANG, authorCompany=null, correspAuthors=Yan-yan YANG, authorNote=null, correspAuthorsNote=null, copyrightStatement=null, copyrightOwner=null, extLink=null, articleAbsUrl=null, sourceXml=null, magXml=null, pdfUrl=null, pdf=null, pdfFileSize=null, pdfExtLink=null, richHtmlUrl=null, mobilePdfUrl=null, reviewReport=null, pdfFirstPage=null, abstractGraph=null, abstractGraphContent=null, abstractVideo=null, citation=null, cebUrl=null, magXmlContent=null, mapNumber=null, fund=null), CN=ArticleExt(id=1314922096023659178, articleId=1314922093658071720, tenantId=1146029695717560320, journalId=1234093305789726721, language=CN, title=夏季柴油车冷、热启动条件下NO_x和NH₃排放特征分析, columnId=1234106388364981004, journalTitle=中国环境科学, columnName=大气污染与控制, runingTitle=null, highlight=null, articleAbstract=

通过在重型车底盘测功机上模拟夏季柴油车在不同载荷状态下冷、热机启动过程，重点分析了柴油车在冷、热启动条件下的NO_x与NH₃排放特性及影响因素．结果表明，冷启动时排气温度与冷却液温度上升较慢，NO_x传感器延迟工作，82%以上的NO_x排放发生在传感器启用前；热启动因系统温度较高，SCR与传感器快速投入运行，NO_x排放明显降低．NH₃排放受启动状态与模拟载荷影响显著，冷启动初期因SCR温度低排放因子高于平均水平；热启动时尿素快速水解且未与NO_x充分反应，导致NH₃排放增加．微观运行模态分析表明，NO_x排放差异主要由发动机与SCR温度决定，NH₃排放差异则与SCR温度及尿素喷射量相关．需要重视夏季柴油车冷机启动过程的污染物排放，协同优化启动过程的温度控制和SCR尿素喷射策略，进一步降低夏季柴油车排放对大气污染的影响．

, authors=冯谦¹, 沈秀娥¹, 卢洋¹, 王蓬睿¹, 周艳青¹, 杨妍妍^{1, 2, *}, authorsList=冯谦, 沈秀娥, 卢洋, 王蓬睿, 周艳青, 杨妍妍, authorCompany=null, correspAuthors=杨妍妍, authorNote=, correspAuthorsNote=, copyrightStatement=null, copyrightOwner=null, extLink=null, articleAbsUrl=null, sourceXml=o8ZKEComfzUjXQYk8fOq3w==, magXml=eGeHq8UZlrq1RDbTbIN0zQ==, pdfUrl=null, pdf=c8xLKTUo8ak8aFlLmr140g==, pdfFileSize=1164021, pdfExtLink=null, richHtmlUrl=null, mobilePdfUrl=null, reviewReport=null, pdfFirstPage=null, abstractGraph=null, abstractGraphContent=null, abstractVideo=null, citation=null, cebUrl=null, magXmlContent=QnME0zWqPNb/rMKU+sUD3A==, mapNumber=null, fund=null)}, authors=[Author(id=1314922096568918706, tenantId=1146029695717560320, journalId=1234093305789726721, articleId=1314922093658071720, orderNo=0, firstName=null, middleName=null, lastName=null, nameCn=null, orcid=null, stid=null, country=null, authorPic=null, dead=0, email=fengqianhg@163.com, emailSecond=null, emailThird=null, correspondingAuthor=0, authorType=1, ext={EN=AuthorExt(id=1314922096640221876, tenantId=1146029695717560320, journalId=1234093305789726721, articleId=1314922093658071720, authorId=1314922096568918706, language=EN, stringName=Qian FENG, firstName=Qian, middleName=null, lastName=FENG, prefix=null, suffix=null, authorComment=null, nameInitials=null, affiliation=null, department=null, xref=¹, address=^1.Beijing Municipal Ecological and Environmental Monitoring Center, Beijing 100048, China, bio=null, bioImg=null, bioContent=null, aboutCorrespAuthor=null), CN=AuthorExt(id=1314922096728302261, tenantId=1146029695717560320, journalId=1234093305789726721, articleId=1314922093658071720, authorId=1314922096568918706, language=CN, stringName=冯谦, firstName=null, middleName=null, lastName=null, prefix=null, suffix=null, authorComment=null, nameInitials=null, affiliation=null, department=null, xref=¹, address=^1.北京市生态环境监测中心，北京 100048, bio={"content":"

冯谦（1986-），男，河北辛集人，高级工程师，博士，主要从事移动源排放监测与管控技术研究．发表论文20余篇．fengqianhg@163.com.

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冯谦（1986-），男，河北辛集人，高级工程师，博士，主要从事移动源排放监测与管控技术研究．发表论文20余篇．fengqianhg@163.com.

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