C175-16 and C175-20 Generator Set Engines Caterpillar


Engine Top Speed Is Not Obtained

Usage:

C175-20 BXR
使用此步骤对发动机无法达到发动机高怠速转速的抱怨进行故障诊断与排除。

可能原因

  • 诊断代码、事件代码和发动机降低额定功率

  • 配置参数

  • 进排气系统

  • 油门信号

  • 发动机机械故障

建议的措施

诊断代码、事件代码和发动机降低额定功率

某些诊断代码、事件代码和/或降低额定功率可能会造成发动机性能变差。 连接 Caterpillar 电子技师(ET)并坚持有无现行代码和/或记录的代码。 在继续进行本步骤之前应对出现的所有代码进行故障诊断与排除。

使用 Cat ET 检查有无记录的降低额定功率。 请参考故障诊断与排除, "事件代码"以了解适用于此应用类型的具体事件。 如果启用了降低额定功率,则 Cat ET 上的状态屏幕将显示降低额定功率。 此时,使用 Cat ET 查看进气歧管空气温度和涡轮增压器压缩机进口空气压力的柱状图。 检查有无高于 65 °C (149 °F) 的进气歧管空气温度,检查有无低于 75 kPa (11 psi) 的涡轮增压器压缩机进口空气压力。 检查发生功率不足抱怨时的柱状图部分。 如果柱状图指示存在故障,则找到故障的原因并进行必要的修理。

配置参数

检查配置参数的设置是否是正确值。 确保将 "Rated Fuel Volume(额定燃油容量)"设置为工厂默认设置。 请参考故障诊断与排除, "配置参数"以了解详情。

进排气系统

  1. 检查空气滤清器阻塞指示器(如有配备)。 清洁阻塞的空气滤清器或更换阻塞的空气滤清器。 请参考操作和保养手册。

  1. 检查进排气系统有无阻塞和/或漏气。 请参考系统操作/测试和调整。

油门信号

在从低怠速位置向高怠速位置升高发动机转速的同时,监控 Cat ET 上的 "Throttle Position(油门位置)"参数。 确认在转换过程中,"Throttle Position(油门位置)"信号没有出现不稳定情况。 如果怀疑信号存在故障,请参考故障诊断与排除, "燃油控制 - 测试"以了解对油门信号电路进行故障诊断与排除的相关信息。

发动机机械故障

  1. 检查有无与气门机构磨损、气门机构损坏或气缸压缩压力低相关的发动机机械故障。 压缩压力低的可能原因如下所列:

    • 活塞故障

    • 活塞环故障

    • 缸套磨损

    • 气门磨损

    • 缸盖密封垫故障

    • 缸盖损坏

  1. 找到故障并进行所有必要的修理。 确保进行的修理排除了故障。

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