DEVICE FOR ESTIMATING VEHICLE BODY VIBRATION AND CONTROLLER FOR SUPPRESSING VEHICLE BODY VIBRATION USING SAME

Title:

DEVICE FOR ESTIMATING VEHICLE BODY VIBRATION AND CONTROLLER FOR SUPPRESSING VEHICLE BODY VIBRATION USING SAME

Document Type and Number:

WIPO Patent Application WO/2012/026441

Kind Code:

A1

Abstract:

Computing sections (31, 32) compute an average front-wheel speed VwF=(VwFL+VwFR)/2 and an average rear-wheel speed VwR=(VwRL+VwRR)/2, and then the resulting values (VwF and VwR) are passed through band-pass filtering sections (33, 34) to extract only a component near a vehicle body resonance frequency, respectively, thus acquiring a vibration component (fVwF) of the front-wheel speed (VwF) near the vehicle body resonance frequency and a vibration component (fVwR) of the rear-wheel speed (VwR) near the vehicle body resonance frequency, the vibration components being representative of a vehicle body vibration. Computing sections (35, 36) are adapted to determine, from the resulting values (fVwF and fVwR), a back-and-forth displacement (Xtf) of the front wheels and a back-and-forth displacement (Xtr) of the rear wheels, the displacements being representative of the vehicle body vibration; to determine, from the resulting values (Xtf and Xtr), the up-and-down displacement of a portion above a front axle and the up-and-down displacement of a portion above a rear axle, the up-and-down displacements being caused by the vehicle body vibration, on the basis of the inherent relations between the back-and-forth displacement and the up-and-down displacement of the front wheels and the rear wheels, the relations being determined by the geometry of a suspension; to estimate the vehicle body vibration (an up-and-down bounce speed (dZv) and a pitch angular velocity (dθp)) from the front and rear up-and-down displacements of the vehicle body; and to determine an amount of driving and braking force compensation (ΔTd) which is necessary to alleviate the vehicle body vibration.

Inventors:

SHIOZAWA YUUKI (JP)
NAWANO MASAAKI (JP)
KOBAYASHI YOSUKE (JP)
NAKAMURA TAMAKI (JP)

Application Number:

PCT/JP2011/068910

Publication Date:

March 01, 2012

Filing Date:

August 23, 2011

Export Citation:

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Assignee:

NISSAN MOTOR (JP)
SHIOZAWA YUUKI (JP)
NAWANO MASAAKI (JP)
KOBAYASHI YOSUKE (JP)
NAKAMURA TAMAKI (JP)

International Classes:

G01M17/007; B60G17/018; B60L15/20; B60W30/02; B60W40/10

Foreign References:

JP2000283758A	2000-10-13
JPH09226336A	1997-09-02
JPH1134631A	1999-02-09
JP2008100605A	2008-05-01
JP2009108830A	2009-05-21
US7010409B2	2006-03-07
JP2004168148A	2004-06-17
JP2009127456A	2009-06-11
JP2008179277A	2008-08-07

Other References: