Patent US4824184A successfully refreshed from Google Patents.
US4824184A
Expired / Lapsed
US
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Antiblock brake controller with brake mode filter
Assignee: Delco Electronics LLC
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Filing: 1987-12-11
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Granted: 1989-04-25
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Expires: 2007-12-11
Abstract
Abstract An anti-lock braking control system is described in which the braking pressure cycle is filtered by limiting the minimum time period of each brake pressure cycle. The period from the time a brake pressure release phase is initiated until the next brake pressure release phase is called for is timed. If the time is less than a predetermined value, the brake pressure is held constant until the minimum time period has expired.
Inventors
- 👤 Peter J. Spadafora
- 👤 Philip M. Headley
- 👤 Alan J. Lee
- 👤 Jill G. Hersberger
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 20:49
CPC Classifications
B; B60; B60T; B60T8/00; B60T8/17; B60T8/176; B60T8/1761; B60T8/17616
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
240 words
A method of limiting the brake pressure applied to a wheel brake of a vehicle, the vehicle being characterized in that resonances are excited therein in response to a cycling of the brake pressure at frequencies greater than a predetermined frequency F, the method comprising the steps of: repeatedly determining a braking mode to establish a brake pressure cycle for limiting the brake pressure applied to the wheel brake to prevent a lockup condition, each determined braking mode comprising one of a pressure release phase, a pressure step down phase, a pressure hold phase and a pressure increase phase; incrementing a count in a counter for each repeated determination of a braking mode; resetting the count in the counter when (A) the last determined braking mode is the pressure release phase or a pressure step down phase, (B) the previously determined braking mode was a pressure hold phase or a pressure increase phase, and (C) the count exceeds a value X representing a period equal to 1/F; resetting the last determined braking mode to the pressure hold phase when (A) the last determined braking mode is the pressure release phase or a pressure step down phase, (B) the previously determined braking mode was the pressure hold phase or a pressure increase phase and (C) the count in the counter is less than X; and controlling the brake pressure applied to the wheel brake in accord with the determined braking phase.
Claim 2
Independent Claim
240 words
A method of limiting the brake pressure applied to a wheel brake of a vehicle, the vehicle being characterized in that resonances are excited therein in response to a cycling of the brake pressure at frequencies greater than a predetermined frequency F, the method comprising the steps of: repeatedly determining a braking mode to establish a brake pressure cycle for limiting the brake pressure applied to the wheel brake to prevent a lockup condition, each determined braking mode comprising one of a pressure release phase, a pressure step down phase, a pressure hold phase and a pressure increase phase; incrementing a count in a counter for each repeated determination of a braking mode; resetting the count in the counter when (A) the last determined braking mode is the pressure release phase or a pressure step down phase, (B) the previously determined braking mode was a pressure hold phase or a pressure increase phase, and (C) the count exceeds a value X representing a period equal to 1/F; resetting the last determined braking mode to the pressure hold phase when (A) the last determined braking mode is the pressure release phase or a pressure step down phase, (B) the previously determined braking mode was the pressure hold phase or a pressure increase phase and (C) the count in the counter is less than X; and controlling the brake pressure applied to the wheel brake in accord with the determined braking phase.
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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) | 1992-04-24 | 1992-10-24 | 1993-04-25 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1996-04-24 | 1996-10-24 | 1997-04-25 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2000-04-24 | 2000-10-24 | 2001-04-25 | $7700.00 | Window Closed / Lapsed |