CAJ | 학술논문

针对目前柴油机在高排气背压下泵气功损失增加、残余废气系数升高、燃油经济性下降等性能恶化的问题，提出通过优化配气正时来解决此类问题的方案。利用GT‐Power软件对LD1110单缸柴油机建立仿真计算模型，对上述解决方案进行了分析研究。计算结果表明：排气背压为0．3 M Pa、进气提前角保持不变、喷油量为45 mg时，柴油机在转速2200 r／min下通过优化排气晚关角可以使平均有效压力提高28．33％，有效燃油消耗率降低22．08％；排气背压由0．1 M Pa增大到0．3 M Pa时，通过配气正时优化，柴油机在转速2000 r／min下平均有效压力的损失可减小12．8％，有效燃油消耗率的增加可降低27．1％。
침대목전시유궤재고배기배압하빙기공손실증가、잔여폐기계수승고、연유경제성하강등성능악화적문제，제출통과우화배기정시래해결차류문제적방안。이용GT‐Power연건대LD1110단항시유궤건립방진계산모형，대상술해결방안진행료분석연구。계산결과표명：배기배압위0．3 M Pa、진기제전각보지불변、분유량위45 mg시，시유궤재전속2200 r／min하통과우화배기만관각가이사평균유효압력제고28．33％，유효연유소모솔강저22．08％；배기배압유0．1 M Pa증대도0．3 M Pa시，통과배기정시우화，시유궤재전속2000 r／min하평균유효압력적손실가감소12．8％，유효연유소모솔적증가가강저27．1％。
For the problems of larger pump loss ,higher residual gas coefficient and worse fuel economy at high exhaust back pressure ,the scheme of optimizing the valve timing was put forward .With GT‐Power software ,the model of LD1110 single‐cylinder diesel engine was built and the optimization of valve timing was analyzed .The results showed that the brake mean ef‐fective pressure (BMEP) and the brake specific fuel consumption (BSFC) improved by 28 .33% and 22 .08% respectively by optimizing the exhaust late close angle at 2 200 r/min with 0 .3 MPa exhaust back pressure ,45 mg fuel injection per cycle and constant intake valve timing .When the exhaust back pressure increased from 0 .1 MPa to 0 .3 MPa at 2 000 r/min ,the BMEP loss and the BSFC increase could decrease by 12 .8% and 27 .1% respectively .