CAJ | 학술논문

介绍了同时降低车用汽油机NOx、CO、HC三种有害排放物的一套技术方案。其中NOx排放通过排气再循环降低，开发出了具有较优排气再循环率特性的排气压力控制式EGR系统，并阐明了其结构及工作原理，由于采用EGR系统而产生的整机小负荷油耗恶化状况可通过适当提前点火加以弥补；CO排放通过严格控制空燃比加以限制；强制怠速工况HC排放可通过采用强制怠速断油装置消除。给出了相应的整机排放控制和优化试验结果，证实了所提方案是有效、可行的。
개소료동시강저차용기유궤NOx、CO、HC삼충유해배방물적일투기술방안。기중NOx배방통과배기재순배강저，개발출료구유교우배기재순배솔특성적배기압력공제식EGR계통，병천명료기결구급공작원리，유우채용EGR계통이산생적정궤소부하유모악화상황가통과괄당제전점화가이미보；CO배방통과엄격공제공연비가이한제；강제태속공황HC배방가통과채용강제태속단유장치소제。급출료상응적정궤배방공제화우화시험결과，증실료소제방안시유효、가행적。
A strategy for controlling NOx、CO and HC emissions from an automotive gasoline engine was proposed. NOx emission was decreased by exhaust gas recirculation(EGR) and a set of EGR system, which could give the optimizing EGR characteristics needed by engine emission test cycle was developed.The structure and constitution of these EGR system were also introduced.The fuel economy penalty at low load conditions caused by EGR was alleviated by a little advance of ignition.CO emission was controlled by strict adjustment of air-fuel ratio.HC emission at high speed idling was eliminated by a corresponding fuel cut-off device.This strategy as well as its validity were proved by the engine tests.