Internal combustion engine knock controlling apparatus
First Claim
1. An internal combustion engine knock controlling apparatus comprising:
- a sensor configured to output a signal based on vibration of an internal combustion engine;
a knock signal calculator configured to calculate, from an output of the sensor, a knock signal at every ignition timing;
a knock signal standard statistic calculator configured to calculate a standard statistic of the knock signal by first filtering processing of the knock signal;
a knock determination threshold calculator configured to calculate a knock determination threshold value for determining knock based on the standard statistic of the knock signal;
a knock determiner configured to determine that the knock has occurred if the knock signal exceeds the knock determination threshold value;
an operating state value detector configured to detect operating state values each indicating an operating condition of the internal combustion engine;
an operating state value deviation normalizer configured to calculate post-normalization operating state value deviations by normalizing deviations between the detected operating state values and values obtained by second filtering processing of the detected operating state values, using a representative value of the operating state values;
a transition correction factor calculator configured to calculate a transition correction factor based on the post-normalization operating state value deviations;
a filter coefficient corrector configured to correct a filter coefficient used in the first filtering processing performed by the knock signal standard statistic calculator, based on the transition correction factor; and
a filter characteristic adjuster configured to adjust a response characteristic of the second filtering processing performed by the operating state value deviation normalizer to be equal to a response characteristic of the first filtering processing performed by the knock signal standard statistic calculator.
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Accused Products
Abstract
An internal combustion engine knock controlling apparatus is obtained that improves knock detection performance by making a correction period appropriate without performing matching, when calculating a transition correction factor for correcting a filter coefficient used for calculating a mean value and a standard deviation of a knock signal in a transitional operation state. A previous value of a filter coefficient for calculating a knock determination threshold value that has been corrected by a transition correction factor is used for a filter coefficient for calculating the transition correction factor so that the response characteristics are made equal between a filtering process used for calculating a transition correction factor for correcting a knock determination threshold value and a filtering process used for calculating the knock determination threshold value in a transition operation period.
39 Citations
10 Claims
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1. An internal combustion engine knock controlling apparatus comprising:
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a sensor configured to output a signal based on vibration of an internal combustion engine; a knock signal calculator configured to calculate, from an output of the sensor, a knock signal at every ignition timing; a knock signal standard statistic calculator configured to calculate a standard statistic of the knock signal by first filtering processing of the knock signal; a knock determination threshold calculator configured to calculate a knock determination threshold value for determining knock based on the standard statistic of the knock signal; a knock determiner configured to determine that the knock has occurred if the knock signal exceeds the knock determination threshold value; an operating state value detector configured to detect operating state values each indicating an operating condition of the internal combustion engine; an operating state value deviation normalizer configured to calculate post-normalization operating state value deviations by normalizing deviations between the detected operating state values and values obtained by second filtering processing of the detected operating state values, using a representative value of the operating state values; a transition correction factor calculator configured to calculate a transition correction factor based on the post-normalization operating state value deviations; a filter coefficient corrector configured to correct a filter coefficient used in the first filtering processing performed by the knock signal standard statistic calculator, based on the transition correction factor; and a filter characteristic adjuster configured to adjust a response characteristic of the second filtering processing performed by the operating state value deviation normalizer to be equal to a response characteristic of the first filtering processing performed by the knock signal standard statistic calculator. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10)
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Specification