CAJ | 학술논문

为满足国-Ⅲ排放而推迟喷油,使中重型电控共轨柴油机机油中碳黑迅速增加,出现机油过早劣化的问题.阐述了国-Ⅲ排放共轨柴油机机油中碳黑的形成机理,对柴油机燃烧系统匹配的理论进行研究,探讨控制和降低柴油机机油中碳黑的措施.研究结果表明:通过优化柴油机喷油结束时间与燃烧室唇口部位设计等能有效地解决这一问题.在国-Ⅲ电控共轨柴油机上进行相关台架试验,对机油中的碳黑进行了监测.结果表明:发动机运行30 h后,机油中碳黑含量为0.43 %,远小于AVL的推荐值.
위만족국-Ⅲ배방이추지분유,사중중형전공공궤시유궤궤유중탄흑신속증가,출현궤유과조열화적문제.천술료국-Ⅲ배방공궤시유궤궤유중탄흑적형성궤리,대시유궤연소계통필배적이론진행연구,탐토공제화강저시유궤궤유중탄흑적조시.연구결과표명:통과우화시유궤분유결속시간여연소실진구부위설계등능유효지해결저일문제.재국-Ⅲ전공공궤시유궤상진행상관태가시험,대궤유중적탄흑진행료감측.결과표명:발동궤운행30 h후,궤유중탄흑함량위0.43 %,원소우AVL적추천치.
To fulfill China-Ⅲ stage emission regulation, the MD&HD diesel engines adopt the measure to delay fuel injection, causing soot-in-oil increasement sharply and lubrication oil deterioration earlier. The formation mechanism of soot-in-oil in the China-Ⅲ CR diesel engine was explained theoretically. From the matching principle of diesel engine combustion system, the countermeasures were discussed. Optimizing injection end timing and the shape of combustion bowl lip may effectively solve above problem. These countermeasures were validated on a real 9 L China-Ⅲ CR engine. The lubrication oil examination results indicate there is only soot content of 0.43 % in lubrication oil after 30 h engine running, far below the limit recommended by AVL.