Air/Fuel Ratio Control - NOX Feedback
电子控制模块 (ECM) 提供空/燃混合控制,以实现低排放级别下的最佳性能和效率。 系统由下列部件组成:ECM 工况图、ECM 输出驱动器、通过 Caterpillar 电子技师(ET)的传感器和用户输入。 ECM 补偿对燃油 BTU 的变化,从而保持预期排放水平。 图 1 为系统主部件的示意图。
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图 1 | g01389952 |
空燃比控制系统的示意图 |
为了精确控制空燃比,ECM 取决于通过 Cat ET 的"配置"屏幕编程的以下参数。 有关这些参数的详情,请参阅系统操作/测试和调整, "电子控制系统参数"。
- "排放反馈模式配置"
- "所需发动机排气 NOx 含量设置"
- "空气 / 燃油比例增益"
- "空气 / 燃油积分增益"
- "期望的燃油阀位置"
系统含有电子燃料计量阀、ECM 输出驱动器和 ECM 工况图。 ECM 补偿对燃油 BTU 的变化,从而保持预期排放水平。
无论何时启用空燃比控制,都可通过"排放反馈模式"配置控制空燃比。
下列步骤讲述基本操作:
- ECM 使用以下因数,以便确定期望的燃油流速:
- 预期发动机转速
- 实际发动机转速
- 计算的发动机负载
- 排气中的 NOX 量
ECM 监控传感器,以便确定排气中的 NOX 量。
- ECM 确定期望的燃油流速,以便实现排气中的 NOX 符合期望的含量。 ECM 制定燃油流量的指令信号。 该信号通过 CAN 数据链路发送到电子燃油计量阀。
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