中国机械工程
中國機械工程
중국궤계공정
CHINA MECHANICAl ENGINEERING
2014年
16期
2247-2252
,共6页
柴油机%选择催化还原%尿素喷射%瞬态特性%在线诊断
柴油機%選擇催化還原%尿素噴射%瞬態特性%在線診斷
시유궤%선택최화환원%뇨소분사%순태특성%재선진단
diesel engine%selective catalytic reduction(SCR)%urea dosing%transient characteristics%on-line diagnosis
基于尿素 SCR 系统瞬态特性，开发了适合柴油机 SCR 瞬态参数的测试与诊断系统；采用DASYLab 软件，编写了接口、标定与诊断程序，实现了 SCR 系统信号显示、存储与再现等功能；依据遍历跟踪与诊断程序，实现了对柴油机 SCR 系统瞬态特性参数的在线测试与诊断；依据柴油机瞬态测试循环法规，进行了柴油机 SCR 系统的 NO x 转化效率、尿素喷射量和 NH 3泄漏量等测试与诊断试验。结果表明：与标准的 AVL 测试系统(AVL CBE Ⅱ气体排放分析与测试系统)相比，所研发的系统动态最大误差为2.05%，动态平均误差为0.82%，故障诊断精确率达到了98.6%，能满足柴油机 SCR 瞬态测试循环要求。
基于尿素 SCR 繫統瞬態特性，開髮瞭適閤柴油機 SCR 瞬態參數的測試與診斷繫統；採用DASYLab 軟件，編寫瞭接口、標定與診斷程序，實現瞭 SCR 繫統信號顯示、存儲與再現等功能；依據遍歷跟蹤與診斷程序，實現瞭對柴油機 SCR 繫統瞬態特性參數的在線測試與診斷；依據柴油機瞬態測試循環法規，進行瞭柴油機 SCR 繫統的 NO x 轉化效率、尿素噴射量和 NH 3洩漏量等測試與診斷試驗。結果錶明：與標準的 AVL 測試繫統(AVL CBE Ⅱ氣體排放分析與測試繫統)相比，所研髮的繫統動態最大誤差為2.05%，動態平均誤差為0.82%，故障診斷精確率達到瞭98.6%，能滿足柴油機 SCR 瞬態測試循環要求。
기우뇨소 SCR 계통순태특성，개발료괄합시유궤 SCR 순태삼수적측시여진단계통；채용DASYLab 연건，편사료접구、표정여진단정서，실현료 SCR 계통신호현시、존저여재현등공능；의거편력근종여진단정서，실현료대시유궤 SCR 계통순태특성삼수적재선측시여진단；의거시유궤순태측시순배법규，진행료시유궤 SCR 계통적 NO x 전화효솔、뇨소분사량화 NH 3설루량등측시여진단시험。결과표명：여표준적 AVL 측시계통(AVL CBE Ⅱ기체배방분석여측시계통)상비，소연발적계통동태최대오차위2.05%，동태평균오차위0.82%，고장진단정학솔체도료98.6%，능만족시유궤 SCR 순태측시순배요구。
Based on the transient characteristic of urea-SCR system,it was developed on the test and diagnostic system on transient parameters of SCR system for diesel engine.The programs on the interface,demarcate and diagnosis could be conveniently compiled by DASYLab software,it could be carried out on the measured and diagnostic functions by the tracking and diagnostic procedure,such as,the transient parameters were collected,storaged,diagnosed and displayed at the same time in SCR system.According to the cycle regulations of the diesel engine transient test,these measured and diag-nostic tests were carried out on the NO x conversion efficiency,the amount of the urea dosing and the NH 3 leakage of SCR system.The testing results show that compared with standard AVL testing sys-tem,the dynamic maximal error of the designed system is as 2.05%,the dynamic average error is as 0.82%,and the diagnostic accuracy rate can also reach 98.6%,which can meet the needs of the dy-namic data acquisition and diagnosis of SCR system for diesel engine greatly.
