Device and method for estimating physical quantity and device and method for ABS control
Number of patents in Portfolio can not be more than 2000
United States of America Patent
Stats
-
Sep 10, 2002
Grant Date -
N/A
app pub date -
Sep 29, 1999
filing date -
Oct 2, 1998
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
A wheel velocity signal for each wheel detected by a wheel velocity sensor is input to a bandpass filter. Signals from frequency bands unrelated to the unsprung resonance are then removed from the wheel velocity signal and only signals from frequency bands related to the unsprung resonance are output. A road surface .mu. gradient estimation device uses an online identification method to identify an damping ratio of a second order resonance model similar to a suspension--tire resonance model from the signal output from the bandpass filter. The road surface .mu. gradient is then estimated from the identified damping ratio. The damping ratio of the second order resonance model corresponds to the road surface .mu. gradient in the following manner: when the damping ratio is identified as being small, the road surface .mu. gradient is estimated as being large; and when the road surface .mu. gradient is identified as being large, the damping ratio is estimated as being small.
First Claim
Family
International Classification(s)
Cited Art Landscape
Patent Citation Ranking
Recipient Email Address
Recipient Email Address
Comment
Recipient Email Address
Add to Portfolio(s)
To add this patent to one, or more, of your portfolios, simply click the add button.
This Patent is in these Portfolios:
Add to additional portfolios:
Last Refreshed On:
Changes done successfully