Patent US4671579A successfully refreshed from Google Patents.
US4671579A
Expired / Lapsed
US
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Anti-skid control device for vehicle braking apparatus
Assignee: Tokico Ltd
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Filing: 1986-03-25
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Granted: 1987-06-09
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Expires: 2006-03-25
Abstract
Abstract An anti-skid control device comprising a detector for detecting a wheel circumferential velocity, an electromagnetic valve for controlling a hydraulic braking pressure for a wheel and an electronic control circuit for preparing an aimed wheel circumferential velocity based on a detection signal from the detector during a time of braking and controlling the electromagnetic valve so as to bring the wheel circumferential velocity closer to said aimed wheel circumferential velocity.
Inventors
- 👤 Susumu Sawano
- 👤 Masaru Sakuma
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 17:20
CPC Classifications
B; B60; B60T; B60T8/00; B60T8/32; B60T8/58; B60T8/17; B60T8/176; B60T8/1763; B60T8/17636
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
130 words
An anti-skid control device comprising means for detecting a wheel circumferential velocity, an electromagnetic valve means for controlling a hydraulic braking pressure for a wheel, and an electronic control circuit means for preparing an aimed wheel circumferential velocity based on a detection signal from said detecting means during a time of braking and controlling said electromagnetic valve means so as to bring the wheel circumferential velocity closer to said aimed wheel circumferential velocity, said circuit means further being adapted to determine a ratio of circumferential acceleration and deceleration of the wheel on every anti-skid controlling period for decreasing/increasing the wheel circumferential velocity, estimate a friction coefficient on a road surface from the ratio and control said electromagnetic valve means based on the thus estimated friction coefficient on the road surface.
Claim 2
Dependent Claim
130 words
An anti-skid control device comprising means for detecting a wheel circumferential velocity, an electromagnetic valve means for controlling a hydraulic braking pressure for a wheel, and an electronic control circuit means for preparing an aimed wheel circumferential velocity based on a detection signal from said detecting means during a time of braking and controlling said electromagnetic valve means so as to bring the wheel circumferential velocity closer to said aimed wheel circumferential velocity, said circuit means further being adapted to determine a ratio of circumferential acceleration and deceleration of the wheel on every anti-skid controlling period for decreasing/increasing the wheel circumferential velocity, estimate a friction coefficient on a road surface from the ratio and control said electromagnetic valve means based on the thus estimated friction coefficient on the road surface.
Claim 3
Dependent Claim
38 words
The anti-skid control device according to claim 1, wherein said circuit means is adapted to adaptationally correct said aimed wheel circumferential velocity from said estimated friction coefficient on the road surface to thereby control the electromagnetic valve means.
Claim 4
Dependent Claim
39 words
The anti-skid control device according to claim 2, wherein said circuit means is adapted to correct a simulated wheel circumferential deceleration by said estimated friction coefficient on the road surface to thereby adaptationally correct said aimed wheel circumferential velocity.
Claim 5
Dependent Claim
43 words
The anti-skid control device according to claim 2, wherein said circuit means is adapted to correct the simulated wheel circumferential deceleration and the slip ratio by said estimated friction coefficient on the road surface to thereby adaptationally correct said aimed wheel circumferential velocity.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1990-06-08 | 1990-12-08 | 1991-06-09 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1994-06-08 | 1994-12-08 | 1995-06-09 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1998-06-08 | 1998-12-08 | 1999-06-09 | $7700.00 | Window Closed / Lapsed |