【摘要】 利用台架试验研究了缸内次后喷(LPI)对柴油机动力性、燃油经济性以及排放性能的影响,分析了不同工况、不同后喷油量下柴油机氧化催化器(DOC)的升温特性,提出了采用缸内次后喷和DOC提高排气温度进行柴油机微粒捕集器(DPF)主动再生的方法。试验结果表明:在中低负荷工况(40%和50%负荷率)通过缸内次后喷能够显著提高发动机排气中的HC排放,促进其在辅助升温装置DOC内的氧化发热,提高DPF入口排气温度,满足DPF主动再生对高温的需求。研究结果对于优化DOC与DPF的匹配有一定参考价值,为DPF再生方法及其控制策略的确定提供依据。更多还原

【Abstract】 An active diesel particulate filter(DPF) regeneration system was evaluated,which applies an in-cylinder late post injection(LPI) and a diesel oxidation catalyst(DOC) to increase exhaust gas temperature for DPF regeneration.The influence of LPI on the performance of diesel engine and temperature rise patterns of DOC were studied by the bench test.The results showed that,at medium and low load conditions(40% and 50% load),LPI produces higher level of unburned hydrocarbon(HC),which is mainly oxidized on DOC to raise exhaust gas temperature to initiate active DPF regeneration.The results should be of certain reference value for optimizing the matching of DOC and DPF,and provides basic information for developing DPF regeneration method and DPF regeneration control strategy.更多还原