Combustion knock detection and control through statistical characterization of knock levels
First Claim
Patent Images
1. A method of statistically characterizing combustion events in a combustion engine, the method comprising:
- receiving at least one signal indicative of knock level associated with combustion events;
estimating at least one parameter of a probability density function and a cumulative distribution function based on receiving the at least one signal;
estimating a probability distribution of the at least one signal based on estimating the at least one parameter; and
calculating at least one value indicative of an nth percentile of the at least one signal based on the at least one parameter.
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Abstract
A method of statistically characterizing combustion knock events includes receiving signals from a sensing device such as an accelerometer, estimating at least one parameter of a probability distribution function based on the received signals, and calculating a value indicative of an nth percentile based on the parameter to predict upcoming combustion knock events.
18 Citations
40 Claims
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1. A method of statistically characterizing combustion events in a combustion engine, the method comprising:
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receiving at least one signal indicative of knock level associated with combustion events; estimating at least one parameter of a probability density function and a cumulative distribution function based on receiving the at least one signal; estimating a probability distribution of the at least one signal based on estimating the at least one parameter; and calculating at least one value indicative of an nth percentile of the at least one signal based on the at least one parameter. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12)
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13. A method of statistically characterizing combustion events in a combustion engine, the method comprising:
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receiving at least one signal indicative of knock level associated with combustion events; estimating at least one parameter of a probability density function and a cumulative distribution function based on receiving the at least one signal; and estimating a probability distribution of the at least one signal based on estimating the at least one parameter, wherein estimating the at least one parameter includes calculating at least one of a running average and a standard deviation of the logarithm of the at least one signal. - View Dependent Claims (14)
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15. A method of statistically characterizing combustion events in a combustion engine, the method comprising:
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receiving at least one signal indicative of knock level associated with combustion events; estimating at least one parameter of a probability density function and a cumulative distribution function based on receiving the at least one signal; and estimating a probability distribution of the at least one signal based on estimating the at least one parameter, wherein estimating the at least one parameter includes calculating at least one of a weighted average and a standard deviation of the logarithm of the at least one signal. - View Dependent Claims (16)
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17. A method of predicting combustion knock events based on real-time statistical characterization of knock level metrics, the method comprising:
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receiving at least one signal indicative of knock level; estimating a first parameter of a probability density function and a cumulative distribution function based on the at least one signal indicative of knock level; calculating a first value indicative of an nth percentile of the at least one signal; calculating a second value indicative of the nth percentile of the at least one signal; and comparing the first value to the second value to predict an upcoming combustion knock event. - View Dependent Claims (18, 19, 20, 21, 22, 23, 24, 25, 26, 27, 28, 29, 30, 31)
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32. A method of predicting combustion knock events based on knock level values substantially independent of knock conditions, the method comprising:
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receiving at least one signal indicative of knock level; estimating a first parameter of a probability density function and a cumulative distribution function based on the at least one signal indicative of knock level; calculating a first value indicative of a first nth percentile of the at least one signal based on the first parameter; calculating a second value indicative of a second nth percentile of the at least one signal based on the first parameter; and normalizing the first value with respect to the second value to predict an upcoming combustion knock event substantially independent on knock conditions. - View Dependent Claims (33, 34, 35, 36, 37, 38, 39)
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40. A method of substantially eliminating a measurement error related at least to a gain of an accelerometer coupled to an engine for predicting combustion knock events, the method comprising:
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generating at least one electric signal with the accelerometer; calculating at least one knock level based on the at least one electric signal; estimating a first parameter of a probability density function and a cumulative distribution function based on the at least one knock level; calculating a first value indicative of a first nth percentile of the at least one knock level based on the first parameter; calculating a second value indicative of a second nth percentile of the at least one knock level based on the first parameter; and normalizing the first value with respect to the second value for substantially eliminating the measurement error in predicting upcoming combustion knock events.
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Specification