CAJ | 학술논문

为满足国Ⅳ排放法规的要求，在某国产二气门国Ⅲ柴油机基础上，改进了增压器及燃烧系统的设计：升级电控系统，设计燃烧室，优化喷油器、增压器，采用冷却废气再循环（EGR）和先进的后处理技术等；并对增压器、燃烧室、供油提前角、轨压、EGR进行排放优化选型及排放标定试验，测量了功率、扭矩、油耗、烟度、气体排放和EGR率、噪声等排放和性能参数，确定了该EGR系统及标定策略。对整机进行了车载故障诊断(OBD)标定。结果表明：这些措施改善了排放和性能；使该柴油机达到了国Ⅳ排放标准，怠速噪声由原来的74 dB降到70 dB。
위만족국Ⅳ배방법규적요구，재모국산이기문국Ⅲ시유궤기출상，개진료증압기급연소계통적설계：승급전공계통，설계연소실，우화분유기、증압기，채용냉각폐기재순배（EGR）화선진적후처리기술등；병대증압기、연소실、공유제전각、궤압、EGR진행배방우화선형급배방표정시험，측량료공솔、뉴구、유모、연도、기체배방화EGR솔、조성등배방화성능삼수，학정료해EGR계통급표정책략。대정궤진행료차재고장진단(OBD)표정。결과표명：저사조시개선료배방화성능；사해시유궤체도료국Ⅳ배방표준，태속조성유원래적74 dB강도70 dB。
A two-valve CN-III diesel engine was improved by designs and tests to meet the CN (China)-IV emission regulation. The improved designs involved upgrading the electronic control system, redesigning the combustion chamber, optimizing the injector and the turbocharger, adopting the exhaust gas recirculation (EGR) and the advanced after-treatment technology. The turbocharger, the combustion chamber, the fuel supply advance angle, the rail pressure and EGR were optimized and calibrated. The performance tests, the emission tests and the noise tests were completed. The EGR system and the calibration strategy were conifrmed by measuring and analyzing the parameters ofpower, torque, fuel consumption, smoke, emission, EGR rates, and the idle speed noise. The vehicle was calibrated by OBD (on-board diagnostic). The results show that the diesel engine meets the CN-IV emission regulation, and the idle speed noise decreased from 74 dB to 70 dB by improving emission and performance.