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<h1 class="h1">柴油发电机冷启动预热装置的检修</span></h1>
<div class="text">发布来源：康柴（深圳）电力技术有限公司　　发布日期: 2024-08-30　　访问量:3555</div>
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<p>衡量柴油发电机性能的重要标准之一就是装备起动良好性，它在严寒低温要素下能否成功启动是柴油发电机一个重要性能指标。要想在低温要素下起动柴油发电机，就需要采取一些辅助办法，否则柴油发电机会因起动不成功，从而引起了燃料的大量浪费。因此，康明斯发电机公司需要采取合理的柴油发电机低温启动步骤，以此提高柴油发电机的启动性能。</p><p>预热装置是柴油发电机特有的。当柴油发电机冷起动时，即使压缩充分，因为温度低，喷入的燃油并未升温至自燃温度，于是，必须用预热机构来改良点火性能。目前生产的低温起动型系列柴油发电机主要采用进气预热的方式提升柴油发电机的低温启动性能。柴油发电机所采用的进气预热方法有两种：</p><p>火焰预热器加热型是通过点燃喷入进气道的柴油对进气进行加热。当柴油发电机内冷却液的温度低于0℃时，火焰预热系统自行起动，使用人在起动柴油发电机的过程中，先把点火钥匙置于预热档，约26s后，预热指示灯关闭，使用人就可以起动柴油发电机了。</p><p>PTC空气加热器加热型是将电能出现的热量事先储存于加热器中，启动时热空气首领先入汽缸，使柴油发电机顺利起动。还有一种预热机构是水箱宝辅助预热装置，即在预热进气的同时，对冷却水进行电加热预热。</p><p>起动预热系统是在柴油发电机冷启动前，通过电子装置加热压缩空气，以提升柴油发电机的起动性能，即使在起动后，还将依据防锈水温度对空气继续加热一定的时间，从而减轻柴油发电机的爆燃和冒白烟现状。起动预热系统有两种具体分类：预热器式和进气加热式。</p><p>用于加热燃烧室的空气，如图1所示；预热器又称为预热塞，其构成原理如图2所示。预热器内装有控制线圈，当其电阻随着温度的升高而增加时，可以降低流往与控制线圈串联的热线圈的电流量，使预热器的温度不会上升较高。预热器的温度可升至约900℃。</p><p>预热装置的运转如图3所示。当柴油发电机防锈水温度偏低时，在启动开关接通后，预热定期器的工作流程如下：</p><p>① 在依据水箱宝温度决定的时间内，定时器1和定期器2都接通，然后同时断开，指示灯发光时间约为0～10s，当定时器1断开时，预热指示灯也断开。</p><p>② 当启动开关旋至ST时，预热定时器或ECU指令控制将预热器接通，防范预热器温度在起动时下降和改良起动性能。</p><p>③ 当定期器3运转时，在依据冷却液温度决定的时间内，将预热继电器接通预热，起动开关从ST旋到ON位置，有利于提升柴油发电机的工作性能。</p><p>在固定延时型的预热机构中，预热定期器控制预热指示灯发光时间和预热器继电器接通的时间（预热时间）。指示灯发光时间约为5s，预热时间约为18s，两者都按固定时间控制。</p><p>在可变延时型的预热装置中；预热定期器控制预热指示灯发光时间以及根据柴油发电机防锈水温度和交流发电机电压（可用作柴油发电机运行信号）而决定的预热器继电器接通时间（预热时间）。指示灯发光时间为2～28s，预热时间为2～55s，两者都根据冷却液温度变化而变化。有些新型预热机构采用陶瓷预热杆，可在2s内达到1000℃，保证柴油发电机像柴油机一样可以快速启动，不会发生普通柴油发电机那样1min增长状况。</p><p>辅助预热系统根据进气温度传感器、冷却液温度传感器和柴油发电机负荷等传感器的信号，控制冷却液预热器的作业，以提高燃烧质量，从而提升柴油发电机的动力性、经济性和排放性。达电控柴油发电机组辅助预热机构控制流程分为预热阶段和后预热阶段，如图7所示。</p><p>打开起动开关后，当防锈水温度低于9℃时预热器被接通，预热期间警告灯亮，预热循环阶段结束时警告灯熄灭，柴油发电机可以起动。</p><p>柴油发电机起动后即为后预热阶段，时间不超过4min，当柴油发电机转速超过2500转/分后，后预热阶段结束。这种预热程序可以降低燃烧噪音，提升怠速稳定性和减低HC排放水平。</p></div><a href="http://www.gdkmsfdj.com/" target="_blank">http://www.gdkmsfdj.com</a>
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