Knock determining apparatus for internal combustion engine
First Claim
1. A knock determining apparatus for an internal combustion engine, the knock determining apparatus comprising:
- a sensor that generates its sensor output as a signal, which forms a waveform that varies in response to a knock state of the engine;
a knock determining means for executing knock determination for determining presence of a knock based on the sensor output;
a parameter computing means for computing a parameter value, which represents a characteristic of noise of the engine, based on the sensor output, wherein the parameter computing means computes the parameter value multiple times in each predetermined crank angular interval, so that a plurality of parameter values are computed by the parameter computing means in the predetermined crank angular interval; and
a noise determining means for determining presence of the noise based on a characteristic of a distribution of the plurality of parameter values, which are computed by the parameter computing means.
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Abstract
For each predetermined crank angular interval, an output of a knock sensor is separated into a plurality of frequency components through a plurality of band-pass filters, and peak values of each frequency component are extracted. Then, a mean and a variance of the peak values are computed for each frequency component. A maximum one of the computed means is selected, and the corresponding frequency component, which is associated with the maximum mean, is selected. It is then determined whether the noise is present based on a ratio between the variance of the selected frequency component and the corresponding mean. If the noise is detected in any of the frequency components, execution of knock determination may be prohibited, or ignition timing feedback control according to a result of the knock determination may be prohibited, or ignition timing may be corrected by retarding the ignition timing.
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Citations
34 Claims
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1. A knock determining apparatus for an internal combustion engine, the knock determining apparatus comprising:
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a sensor that generates its sensor output as a signal, which forms a waveform that varies in response to a knock state of the engine; a knock determining means for executing knock determination for determining presence of a knock based on the sensor output; a parameter computing means for computing a parameter value, which represents a characteristic of noise of the engine, based on the sensor output, wherein the parameter computing means computes the parameter value multiple times in each predetermined crank angular interval, so that a plurality of parameter values are computed by the parameter computing means in the predetermined crank angular interval; and a noise determining means for determining presence of the noise based on a characteristic of a distribution of the plurality of parameter values, which are computed by the parameter computing means. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17)
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18. A knock determining apparatus for an internal combustion engine, the knock determining apparatus comprising:
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a sensor that generates its sensor output as a signal, which forms a waveform that varies in response to a knock state of the engine; a knock determining section that executes knock determination for determining presence of a knock based on the sensor output; a parameter computing section that computes a parameter value, which represents a characteristic of noise of the engine, based on the sensor output, wherein the parameter computing section computes the parameter value multiple times in each predetermined crank angular interval, so that a plurality of parameter values are computed by the parameter computing section in the predetermined crank angular interval; and a noise determining section that determines presence of the noise based on a characteristic of a distribution of the plurality of parameter values, which are computed by the parameter computing section. - View Dependent Claims (19, 20, 21, 22, 23, 24, 25, 26, 27, 28, 29, 30, 31, 32, 33, 34)
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Specification