280柴油机凸轮轴改进

针对12V280ZJ柴油机在某些方面存在的一些问题，提出改进方案：通过延长排气门关闭段，并加大关闭段后期的开度，以加强排气重叠期，增强对气缸和排气门的扫气，来解决排气温度和排气门温度偏高问题；将标定工况时的供油提前角向后推移2°凸轮转角，解决了部分负荷工况供油率偏低、油耗高等问题。经过在280单缸柴油机上的试验，试验结果达到了预计目标。

Improvement of 280 Diesel Engine Camshaft

For the problems in 12V280ZJ performance,this paper proposes some improvement schemes:one is delaying the exhaust valve closure and increasing the opening of the exhaust valve closure period,so increasing the cylinder exhaust overlapping period and scavenging,to resolve the high exhaust-gas and high exhaust valve temperature; The other is delaying the injection timing 2 degree(camshaft angle) when the engine diesel is in full load,which can resolve the low rate of fuel supply and BSFC. After the performance...