| 摘要 |
An apparatus for estimating vibration input to be transferred from a road surface to a suspension device of a vehicle. The apparatus converts stroke displacement values (SFL, SFR) detected by stroke sensor (27FL, 27FR) arranged on locations near the front wheels into stroke speed values (SVFL, SVFR) by differentiating circuits (41a, 41b) including a high-pass filer whose cutoff frequency (fHC) is set at substantially twice the spring-bottom resonance frequency (20 Hz, for example). The apparatus further converts body work vertical acceleration values (ZGFL, ZGFR) detected by vertical acceleration sensors (28FL, 28FR) arranged on locations near the front wheels into spring-top speed values (ZVFL, ZVFR) by integrating circuits (41c, 41d) including a low-pass filter whose cutoff frequency (fLC) is set at nearly one sixth of the spring-top resonance frequency (0.2 Hz, for example). The apparatus adds these speed values to each other by adders (41e, 41f) to provide differential values (xOFL', xOFR' ) of the spring-bottom displacement values obtained by accurately estimating the vibration input from a road surface by cancelling the spring-top speeds with each other.
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