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    • 46. 发明授权
    • Frequency spectrum analyzing apparatus
    • 频谱分析装置
    • US08725463B2
    • 2014-05-13
    • US13120433
    • 2009-09-09
    • Natsuko KitamuraYoshiaki AkimotoJiro TakagiAtsushi KurauchiMasayuki YoshiiriHirotaka KomatsuKazuhiko HirotaMakoto Murakami
    • Natsuko KitamuraYoshiaki AkimotoJiro TakagiAtsushi KurauchiMasayuki YoshiiriHirotaka KomatsuKazuhiko HirotaMakoto Murakami
    • G01R23/16G06F17/00G06F19/00G01L23/22G05B15/00
    • G01R23/16G01L23/221G01L23/225G01M15/12G05B15/00G06F17/00G06F19/00
    • A frequency spectrum analyzing apparatus for performing a frequency spectrum analysis with respect to a detected value of an operating parameter of an internal combustion engine in synchronism with rotation of the engine, is provided. The operating parameter is sampled at predetermined time intervals, and a sampled value is converted to a digital value. Intensities of first and second elements are calculated with respect to a predetermined number of the sampled values. The first elements and second elements respectively correspond to a plurality of frequency components contained in the detected value, and a phase of the second element differs from a phase of the first element by 90 degrees. Frequency component intensities corresponding to the plurality of frequency components are calculated in synchronism with rotation of the engine, using the first element intensities and the second element intensities. The frequency component intensities are calculated by replacing a part of an integrated value of the first element intensities, and a part of an integrated value of the second element intensities respectively with corresponding preceding calculated values, when an rotational speed of the engine is higher than or equal to a set threshold value.
    • 提供了一种频谱分析装置,用于与发动机的旋转同步地执行关于内燃机的操作参数的检测值的频谱分析。 以预定的时间间隔对操作参数进行采样,并将采样值转换为数字值。 相对于预定数量的采样值来计算第一和第二元素的强度。 第一元件和第二元件分别对应于包含在检测值中的多个频率分量,并且第二元件的相位与第一元件的相位不同90度。 使用第一元件强度和第二元件强度,与发动机的旋转同步地计算与多个频率分量对应的频率分量强度。 通过将发动机的转速高于或等于的第一元件强度的积分值的一部分和第二元件强度的积分值的一部分分别与相应的先前计算值相对应地计算频率分量强度, 等于设定的阈值。