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    • 8. 发明申请
    • Method and system for determining engine cylinder power level deviation from normal
    • 确定发动机气缸功率水平与正常偏差的方法和系统
    • US20050257604A1
    • 2005-11-24
    • US10848310
    • 2004-05-18
    • Masoud ZavarehiYang LiuConrad Grembowicz
    • Masoud ZavarehiYang LiuConrad Grembowicz
    • F02B33/22F02D41/00F02D41/14F02D41/22
    • F02D41/1497F02D41/1498
    • Individual cylinder output deviations from a normal operating engine cylinder are detected via an analysis of crank shaft speed fluctuations. In the detection phase, the engine is operated at a steady state low idle condition, and engine speed data is collected over a plurality of engine cycles. This data is then averaged, filtered and compared to expected engine speed data. A substantial deviation from the expected speed data in the region of crank shaft angles associated with an individual cylinder during its power stroke adjacent its top dead center position indicates a power level deviation in that cylinder. The magnitude of the power level deviation can then be assessed through a similar procedure where engine speed data is collected, averaged, filtered and compared to expected engine speed data when the engine is operating in a steady state rated condition.
    • 通过对曲轴转速波动的分析来检测与正常运行的发动机气缸的独立气缸输出偏差。 在检测阶段,发动机在稳定状态低怠速状态下工作,并且在多个发动机循环中收集发动机速度数据。 然后对该数据进行平均,过滤并与预期的发动机转速数据进行比较。 在与独立气缸相邻的曲柄轴角度区域内的预期速度数据的显着偏差在其邻近其上死点位置的功率冲程期间指示在该气缸中的功率水平偏差。 然后可以通过类似的程序来评估功率水平偏差的大小,其中发动机速度数据被收集,平均,过滤并且当发动机在稳态额定条件下运行时与预期发动机转速数据进行比较。