Apparatus for estimating vibration input to a suspension device
US5410482A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | May 17, 1993 |
| Grant date | Apr 25, 1995 |
| Priority date | — |
| Expiry date | May 17, 2013 |
Classification
- Technology area (CPC B)Performing Operations; Transporting
- CPC primaryB60G2600/604
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
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 (S.sub.FL, S.sub.FR) detected by stroke sensor (27FL, 27FR) arranged on locations near the front wheels into stroke speed values (S.sub.VFL, S.sub.VFR) by differentiating circuits (41a, 41b) including a high-pass filer whose cutoff frequency (f.sub.HC) is set at substantially twice the spring-bottom resonance frequency (20 Hz, for example). The apparatus further converts body work vertical acceleration values (Z.sub.GFL, Z.sub.GFR) detected by vertical acceleration sensors (28FL, 28FR) arranged on locations near the front wheels into spring-top speed values (Z.sub.VFL, Z.sub.VFR) by integrating circuits (41c, 41d) including a low-pass filter whose cutoff frequency (f.sub.LC) 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 (x.sub.OFL ', x.sub.OFR ' ) of the spring-bottom displacement values obtained by accurately estimating the vibration input from a road surface by cancellin…
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.