发明名称 |
Apparatus and method for controlling internal combustion engine |
摘要 |
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.
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申请公布号 |
US2005234632(A1) |
申请公布日期 |
2005.10.20 |
申请号 |
US20050106568 |
申请日期 |
2005.04.15 |
申请人 |
MASUDA SATOSHI;INOUE MASAOMI;TAKEMURA YUICHI;KASASHIMA KENJI;KANEKO RIHITO |
发明人 |
MASUDA SATOSHI;INOUE MASAOMI;TAKEMURA YUICHI;KASASHIMA KENJI;KANEKO RIHITO |
分类号 |
F02D45/00;F02D41/24;G01L23/22;(IPC1-7):G01L23/22 |
主分类号 |
F02D45/00 |
代理机构 |
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代理人 |
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主权项 |
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地址 |
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