高压共轨柴油机随机停缸策略的试验研究

Experimental Research on Random Cylinder Deactivation Strategy for High Pressure Common Rail Diesel Engine

为了降低小负荷工况特别是怠速工况燃油消耗和排放,开发了随机停缸算法,并进行了随机停缸策略的试验研究。试验结果表明:在怠速工况下,相同的停缸数时随机停缸比固定停缸转速波动小且稳定性好;随着停缸数的增加,工作缸的喷油量相应增大,工作缸燃烧持续期和放热率峰值增大,燃烧热损失率越低,降低了燃烧过程的传热损失,从而提高了热效率,起到了很好的节油效果,同时未燃HC、不完全燃烧产物CO和碳烟的排放减少。

In order to reduce the fuel consumption and emissions under low load, especially at idling condition, a random cylinder deactivation algorithm is developed and a relevant experiment is also conducted. The results show that with the same number of cylinders in deactivation, random cylinder deactivation has more stability with less speed fluctuation compared with fixed cylinder deactivation. With the increase in the number of cylinders in deactivation, the fuel injection quantity of working cylinder increases correspondingly so that combustion duration is longer, heat release rate peak also higher and combustion heat loss rate smaller, resulting in lower heat loss, which improves the thermal efficiency and lowers the fuel consumption. Emissions of unburned HC, incompletely burned CO and soot also are reduced obviously.