Apparatus for detecting knocking of internal combustion
First Claim
1. An apparatus for detecting occurrence of knocking of an engine from a signal sensed by a knocking sensor attached to the engine, comprising:
- a plurality of filters extracting, from the signal sensed by the knocking sensor, a plurality of signal components whose frequency bands differ from each other; and
a knocking determination unit determining whether or not there is the occurrence of knocking on a basis of results outputted from the plurality of filters, wherein the plurality of filters include a first type of filter of which pass band is set to a first specific frequency band including a first specific frequency of the signal from knocking sensor, the first specific frequency indicating the occurrence of knocking, and a second type of filter of which pass band is set to a second specific frequency band other than the first specific frequency band, wherein both of the first and second types of filters have filtering characteristics, an inclination of the filtering characteristic of the second type of filter at a cut-off frequency thereof being steeper than an inclination of the filtering characteristic of the first type of filter at a cut-off frequency thereof.
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Abstract
An apparatus is provided for detecting an occurrence of knocking of an engine from a signal sensed by a knocking sensor for the engine. The apparatus comprises plural filters extracting, from the signal, plural signal components whose frequency bands mutually differ and a unit determining whether or not there is the occurrence of knocking, based on results outputted from the plural filters. The plural filters include first and second types of filters. The first type of filter has a pass band set to a specific frequency band including a specific frequency of the signal. This specific frequency indicates the occurrence of knocking. The second type of filter has a pass band set to another specific frequency band. An inclination of a filtering characteristic of the second type of filter at a cut-off frequency thereof is steeper than that the first type of filter.
35 Citations
19 Claims
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1. An apparatus for detecting occurrence of knocking of an engine from a signal sensed by a knocking sensor attached to the engine, comprising:
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a plurality of filters extracting, from the signal sensed by the knocking sensor, a plurality of signal components whose frequency bands differ from each other; and
a knocking determination unit determining whether or not there is the occurrence of knocking on a basis of results outputted from the plurality of filters, wherein the plurality of filters include a first type of filter of which pass band is set to a first specific frequency band including a first specific frequency of the signal from knocking sensor, the first specific frequency indicating the occurrence of knocking, and a second type of filter of which pass band is set to a second specific frequency band other than the first specific frequency band, wherein both of the first and second types of filters have filtering characteristics, an inclination of the filtering characteristic of the second type of filter at a cut-off frequency thereof being steeper than an inclination of the filtering characteristic of the first type of filter at a cut-off frequency thereof. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19)
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Specification
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- Resources
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Current AssigneeDENSO Corporation
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Original AssigneeDENSO Corporation
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InventorsHonda, Takayoshi
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Primary Examiner(s)Vo, Hieu T.
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Application NumberUS10/823,668Publication NumberTime in Patent Office524 DaysField of Search701/111, 73/350.1, 73/350.5, 731/173, 123/406.21, 123/406.38, 123/406.39US Class Current701/111CPC Class CodesG01L 23/225 circuit arrangements therefor
