FREQUENCY COMPONENT ANALYZER - HONDA MOTOR CO LTD

Title:

FREQUENCY COMPONENT ANALYZER

Document Type and Number:

WIPO Patent Application WO/2010/035634

Kind Code:

A1

Abstract:

Provided is a frequency component analyzer which analyzes the frequency component in the detected value of the operating parameter of an internal combustion engine in synchronization with the rotation of the internal combustion engine. The operating parameter is sampled at predetermined time intervals and the sampled value is converted into a digital value. The intensity of a first element and the intensity of a second element of which the phase is shifted from that of the first element by 90 degrees are calculated with respect to a predetermined number of sampled values, said first element and said second element corresponding to a plurality of frequency components included in the detected value. The intensities of the frequency components of a plurality of frequencies are calculated by using the intensity of the first element and the intensity of the second element in synchronization with the rotation of the internal combustion engine. When the rotation speed of the internal combustion engine is not lower than a set threshold value, the calculation of the intensities of the frequency components is performed by substituting part of the integrated value of the intensities of the first elements by the previously calculated value thereof and substituting part of the integrated value of the intensities of the second elements by the previously calculated value thereof.

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Inventors:

KITAMURA NATSUKO (JP)
AKIMOTO YOSHIAKI (JP)
TAKAGI JIRO (JP)
KURAUCHI ATSUSHI (JP)
YOSHIIRI MASAYUKI (JP)
KOMATSU HIROTAKA (JP)
HIROTA KAZUHIKO (JP)
MURAKAMI MAKOTO (JP)

Application Number:

PCT/JP2009/065696

Publication Date:

April 01, 2010

Filing Date:

September 09, 2009

Export Citation:

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Assignee:

HONDA MOTOR CO LTD (JP)
KITAMURA NATSUKO (JP)
AKIMOTO YOSHIAKI (JP)
TAKAGI JIRO (JP)
KURAUCHI ATSUSHI (JP)
YOSHIIRI MASAYUKI (JP)
KOMATSU HIROTAKA (JP)
HIROTA KAZUHIKO (JP)
MURAKAMI MAKOTO (JP)

International Classes:

F02D45/00; F02P5/152; F02P5/153; G01M15/00; G16Z99/00

Foreign References:

JPH11315752A	1999-11-16
JP2005090250A	2005-04-07
JPH04309871A	1992-11-02
JPH06258192A	1994-09-16
JPH11295188A	1999-10-29
JPH01303673A	1989-12-07
JP2008025418A	2008-02-07
JP2000227013A	2000-08-15

Other References: