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IC660BBD022
IC660BBD022
IC660BBD022
IC660BBD022
起动接触器得电与否,应取决于柴油机管路内的油压状况。理想的控制应是以滑油压力和燃油压力作为控制信号,这样在首次起动时,如果油压建立不起来或油管路中存在问题时,将不会起动柴油机。而目前在起动过程中主要是在45s~60s 延时后,由人为观测滑油压力表和机油压表,假定在45s~60s 的延时过程中,油压一定会建立起来这样一种假设的情况下,进行Q C 得电控制的,缺乏控制手段。为此,可采用压力传感器来提取机油和燃油压力信号,并将其通过转换输入到PCC 中,由PCC 根据设定值判断和执行QC 的得电控制。
2.2 根据点火时柴油机的转速进行停止起动电机(QD)运转的控制
柴油机起动是否成功,关键在于柴油机是否能正常点火,作为起动的终止应受控于柴油机发火转速,如果因为某种原因不能正常起动,则应自动停止起动,以减少蓄电池的放电量和避免起动接触器烧死。正常情况下,东风4型系列机车柴油机起动时,点火转速在150r/min 左右,稳定运转的最低转速为430r/min。如果采取转速传感器测出柴油机的转速,并将转速信号输入到PCC 中,由PCC 判断和控制QC 的开断,即控制蓄电池向起动电机供电:(1)可节省蓄电池的电能,有利于蓄电池的保养;(2)电动机由驱动转动变为柴油机的负载,可降低柴油机起动的转速冲击。
2.3 对电磁联锁DLS拖后供电控制,实现向气缸适时喷油
在柴油机起动过程中的低转速阶段向气缸内供油,由于油温较低不能达到完全燃烧,同时,又会降低气缸燃烧时的温度,造成起动困难,甚至爆燃。因此,可采用对起动接触器及调速器内D LS 电磁联锁线圈进行单独供电控制。这样,可使柴油机先转动,后拉动喷油泵供油齿条,以此来拖后向气缸内供油。
鉴于当柴油机由起动电机拖动运转,转速接近或达到点火转速时向气缸内喷油最有利于柴油机点火,因此,DLS 线圈得电与否应取决于柴油机拖动转速。不同的柴油机或同一柴油机在不同的工作环境和状态下,其点火转速是不同的。与点转速有关的因素主要有气缸内的温度、压力、氧气含量和燃油的雾化状态,影响气缸内温度的主要因素为油水温度,所以对DLS 电磁联锁线圈的控制可采用温度传感器检测油水温度来进行控制。
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