Knock determining apparatus and method for internal combustion engine
First Claim
1. A knock determining apparatus for an internal combustion engine, comprising:
- a sensor, which outputs a signal that has a waveform corresponding to the knock state of the internal combustion engine;
a distribution determining section, wherein the distribution determining section obtains a plurality of variables representing the characteristics of a knock from an output signal of the sensor every time the engine is ignited, and obtains a distribution of the variables corresponding to a predetermined number of times of ignition; and
a knock state determining section, which determines the occurrence of a knock based on whether the profile of the distribution obtained by the distribution determining section has the characteristics that appear at the occurrence of a knock.
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Abstract
A plurality of variables representing the characteristics of a knock is obtained from an output signal of a sensor. The variables include a peak value of the knock frequency component in the output signal of the sensor and a waveform correlation coefficient representing the correlation between the waveform of the output signal and an ideal knock waveform, which is the waveform specific to a knock. The peak value and the waveform correlation coefficient are normalized, and a detection distribution is created using the obtained normalized data values. A correlation coefficient for knock determination representing the correlation between the detection distribution and an ideal knock distribution is calculated. The correlation coefficient for knock determination is compared with a predetermined knock determination threshold value, and the knock determination threshold value is corrected in accordance with the comparison result. As a result, the accuracy and the reliability of knock determination are improved.
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Citations
11 Claims
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1. A knock determining apparatus for an internal combustion engine, comprising:
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a sensor, which outputs a signal that has a waveform corresponding to the knock state of the internal combustion engine;
a distribution determining section, wherein the distribution determining section obtains a plurality of variables representing the characteristics of a knock from an output signal of the sensor every time the engine is ignited, and obtains a distribution of the variables corresponding to a predetermined number of times of ignition; and
a knock state determining section, which determines the occurrence of a knock based on whether the profile of the distribution obtained by the distribution determining section has the characteristics that appear at the occurrence of a knock. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8)
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9. A knock determining apparatus for an internal combustion engine, comprising:
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a sensor, which outputs a signal that has a waveform corresponding to the knock state of the internal combustion engine; and
an engine control unit, wherein the engine control unit;
obtains a plurality of variables representing the characteristics of a knock from an output signal of the sensor every time the engine is ignited;
obtains a distribution of the variables corresponding to a predetermined number of times of ignition; and
determines the occurrence of a knock based on whether the profile of the obtained distribution has the characteristics that appear at the occurrence of a knock.
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10. A knock determining method for an internal combustion engine, comprising:
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outputting a signal that has a waveform corresponding to the knock state of the internal combustion engine from a sensor;
obtaining a plurality of variables representing the characteristics of a knock from an output signal of the sensor every time the engine is ignited;
obtaining a distribution of the variables corresponding to a predetermined number of times of ignition; and
determining the occurrence of a knock based on whether the profile of the obtained distribution has the characteristics that appear at the occurrence of a knock. - View Dependent Claims (11)
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Specification