Catalytic Converter Pressure - Test - If Equipped
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催化转化器 (1) 催化转化器出口处的温度传感器 (2) 催化转化器出口处的氧传感器 (3) 催化转化器进口处的温度传感器 | |
排气压力过大可能会导致排气温度过高。 排气温度过高可能损坏催化转化器的基体涂层。 检查排气压力以便确认排气系统设计正确。
以下因素可能会导致催化剂堵塞：
- 初始发动机设置时碎屑落入催化剂
- 积碳结构在基体上形成沉积物
- 使用不正确的发动机机油造成的粉末状灰色 / 白色烟灰
- 发动机缺火和 / 或回火导致碎屑落入催化剂
排气压力是在发动机在额定转速和满载条件下运行时测量的。 使用水柱压力计或者机械压力表测量排气压力。
总排气压力从转化器进口壳体的测试端口处测量。 总排气压力是发动机排气歧管和转化器之间的压力。
可接受的总排气压力是
检查出口处的排气压力以便计算转化器上的压差。 该压差提供有关催化剂堵塞的信息。 催化转化器后面的压力从转化器出口壳体的测试端口处测量。
催化转化器两端的最大压差为
如果怀疑催化转化器有故障，请参考以下信息：
- 系统操作, "催化转化器"
- 测试与调整, "催化转化器性能 - 测试"
- 测试与调整, "催化转化器基体 - 检查"
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