基于Atkinson循环的混合动力汽车用发动机探讨

【摘要】 Atkinson循环发动机在低速小负荷时性能较差,但混合动力汽车在低速小负荷时采用电动机驱动避开其性能不好的工况范围,使其在中间负荷区域充分发挥优势。Atkinson循环利用进气门晚关控制负荷,减少了泵气损失和压缩功,可以更大程度地将热能转换为机械能,提高发动机热效率,从而降低燃油消耗;实际压缩比的降低使缸内燃烧温度降低,有利于改善NOX排放。采用Atkinson循环能提高整车的燃油经济性和排放性能。更多还原

【Abstract】 Though the performance of the Atkinson cycle engine is poor on light load, hybrid vehicle using electromotor-driver on light load avoids the poor condition, and the Atkinson cycle can take advantage of its predominance on mid-load.Atkinson cycle using LIVC(Late Intake Valve Closing) to control the engine load can reduce the pumping and compressing loss,which can farthest convert heat energy to mechanical energy to increase the engine thermal efficiency and decrease the fuel consumption.The reduction of actual compression ratio makes the cylinder combustion temperature lower, and improves the NOx emission. Combining with the hybrid vehicle,Atkinson cycle can improve the performance of the vehicle fuel consumption and emission.更多还原