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    • 54. 发明申请
    • KNOCK DETECTION DEVICE AND KNOCK DETECTION SYSTEM DIAGNOSIS DEVICE
    • 锁定检测装置和锁定检测系统诊断装置
    • US20090211337A1
    • 2009-08-27
    • US12368490
    • 2009-02-10
    • Satoshi MasudaHirohiko YamadaShuhei OeNaoki Kokubo
    • Satoshi MasudaHirohiko YamadaShuhei OeNaoki Kokubo
    • G01L23/22
    • G01L23/225
    • An output of a knock sensor is A/D converted in a specified knock determination range. In a time-frequency analysis part, data of frequency, time, and vibration intensity are extracted at the same time from the knock sensor output signal and the time-varying patterns of vibration intensities in multiple frequency ranges are extracted. An edge direction and an edge intensity are computed by an edge extraction processing. A correlation value expressing a correlation between time-varying patterns of vibration intensities in multiple frequency ranges and a reference model expressing the feature of knock is computed in a mutual correlation/knock determination part. The correlation value is compared with a determination threshold. When the correlation value is larger than the determination threshold, it is determined that knock is caused. When the correlation value is not larger than the determination threshold, it is determined that knock is not caused.
    • 敲击传感器的输出在指定的敲击判定范围内进行A / D转换。 在时频分析部分,从爆震传感器输出信号中同时提取频率,时间和振动强度的数据,并提取多个频率范围内的振动强度的时变模式。 通过边缘提取处理来计算边缘方向和边缘强度。 在互相关/敲击判定部中计算出表示多个频率范围的振动强度的时变图案与表示敲击特征的参照模型之间的相关性的相关值。 将相关值与确定阈值进行比较。 当相关值大于确定阈值时,确定发生敲击。 当相关值不大于确定阈值时,确定不引起敲击。