Data processing: vehicles – navigation – and relative location – Vehicle control – guidance – operation – or indication – With indicator or control of power plant
Reexamination Certificate
2006-05-30
2006-05-30
Vo, Hieu T. (Department: 3747)
Data processing: vehicles, navigation, and relative location
Vehicle control, guidance, operation, or indication
With indicator or control of power plant
Reexamination Certificate
active
07054735
ABSTRACT:
An ECU obtains two data values (a peak value and a waveform correlation coefficient) that show the characteristics of a knock from the output of a knock sensor. The ECO approximately obtains the mean of each data value by smoothing each data value, and approximately obtains a variance by smoothing the squared deviation between the data values before and after the smoothing process. The ECU then computes the square root of the variance to approximately obtain a standard deviation. The ECU normalizes each data value using the mean and the standard deviation, obtains a distribution of the normalized two data values, and calculates a correlation coefficient that shows the correlation between the obtained distribution and an ideal knock distribution. Based on the correlation coefficient, the ECU corrects a knock determination threshold value. Therefore, the mean and the standard deviation of the data values are computed with a small RAM capacity.
REFERENCES:
patent: 4991553 (1991-02-01), Kurihara et al.
patent: 6-60621 (1985-12-01), None
patent: 7-180599 (1995-07-01), None
Inoue Masaomi
Kaneko Rihito
Kasashima Kenji
Masuda Satoshi
Takemura Yuichi
Denso Corporation
Kenyon & Kenyon LLP
Toyota Jidosha & Kabushiki Kaisha
Vo Hieu T.
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