3512C Engines for 785C Off-Highway Trucks with Dynamic Gas Blending Caterpillar


Engine Overspeeds

Usage:

3512 8BR
利用本程序对发动机超速进行故障诊断与排除。 此外,如果以下任一事件代码为激活或记录状态,应使用本步骤。

表 1
J1939 代码和描述  CDL 代码和描述  注释 
190-0
发动机转速:高 - 最高严重程度(3) 
E362 (3)
发动机超速 
发动机超过最大转速一段时间。 
190-15
发动机转速:高 - 最低严重程度(1)  
E362 (1)
发动机超速 
发动机超过最大转速一段时间。 
190-16
发动机转速:高 - 中等严重程度 (2) 
E362 (2)
发动机超速 
发动机超过最大转速一段时间。 

可能原因

  • 陡坡(如适用)

  • 涡轮增压器

  • 进气

建议的措施

表 2
故障诊断与排除测试步骤  数值  结果 

1. 确认超速不是由于下陡坡引起

可能需要在陡坡上接合发动机制动器。

A. 使用发动机制动器时,操作员需要了解正确的机器操作方法。

并非所有应用场合都有发动机制动器。
 

陡坡
 

结果:陡坡是超速的原因所在。

控制陡坡上的发动机转速。 返回工作。

结果:陡坡不是超速的原因所在。

转至测试步骤 2。
 

2. 检查涡轮增压器是否正常工作

A. 检查有无任何机油漏入进气中。
 

涡轮增压器
 

结果:涡轮增压器中的机油漏入进气口中。

修理:修理或更换涡轮增压器。

结果:涡轮增压器中的机油没有漏入进气口中。

转至测试步骤 3。
 

3. 检查进气的质量

A. 检查周围有无可燃气体。

B. 检查起动辅助装置(如果配备)是否正常工作。
 

空气质量
 

结果:大气中含有可燃气体。

修理:不要在有可燃气体的环境中运行发动机。

确认修理后故障得到排除。
 

联系当地 Cat 代理商的技术通信员(TC)。 如需进一步的帮助,您的 TC 可以通过代理商解决方案网络(DSN)与您交谈。

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