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US4900099A
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Method of controlling the brake pressure in an anti-lock vehicle brake system
Assignee: ZF International UK Ltd
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Filing: 1989-03-23
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Granted: 1990-02-13
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Expires: 2009-03-23
Abstract
Abstract In a method of controlling the brake pressure in an anti-lock vehicle brake system (ABS system), wherein the rotational behavior of a braked wheel is measured and the brake pressure is lowered in response to the slip and/or rotational retardation of the wheel if threshold values are exceeded, and is subsequently raised again and then kept constant during a phase of steady pressure, it is provided that the duration (t1H, t2H . . . t5H) of the pressure stability phase is adjusted in response to a comparison of the pressure reduction periods (t1DOWN, t2DOWN . . . ) and/or the pressure build-up periods (t1UP, t2UP . . . ) of the instantaneous control cycle (1,2 . . . 5) with those of at least one preceding control cycle in order to obtain shorter stopping distances.
Inventors
- 👤 Volker Braschel
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 19:07
CPC Classifications
B; B60; B60T; B60T8/00; B60T8/32; B60T8/58; B60T8/17; B60T8/176; B60T8/1761; B60T8/17616; Y; Y10; Y10S; Y10S303/00; Y10S303/02; Y10S303/03; Y10S303/04
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
158 words
A method of controlling the brake pressure in an anti-lock vehicle brake system, wherein the rotational behavior of a braked wheel is measured and the brake pressure is lowered in response to the slip and/or rotational retardation of the wheel if a given threshold value is exceeded, and is subsequently raised again and then kept constant during a phase of steady pressure, characterized in that the duration (t1H, t2H . . . t5H) t5 H) of the pressure stability phase is adjusted in response to a comparison of the pressure reduction period (t1DOWN, t2DOWN . . . ) and/or the pressure build-up period (t1UP, t2UP . . . ) of the present control cycle with a pressure reduction period or a pressure build-up period in a previous control cycle such that the duration of the phase of steady pressure becomes longer if the periods of pressure reduction or pressure build-up compared are in agreement than if they differ.
Claim 2
Independent Claim
158 words
A method of controlling the brake pressure in an anti-lock vehicle brake system, wherein the rotational behavior of a braked wheel is measured and the brake pressure is lowered in response to the slip and/or rotational retardation of the wheel if a given threshold value is exceeded, and is subsequently raised again and then kept constant during a phase of steady pressure, characterized in that the duration (t1H, t2H . . . t5H) t5 H) of the pressure stability phase is adjusted in response to a comparison of the pressure reduction period (t1DOWN, t2DOWN . . . ) and/or the pressure build-up period (t1UP, t2UP . . . ) of the present control cycle with a pressure reduction period or a pressure build-up period in a previous control cycle such that the duration of the phase of steady pressure becomes longer if the periods of pressure reduction or pressure build-up compared are in agreement than if they differ.
Claim 3
Dependent Claim
23 words
The method as claimed in claim 1, characterized in that the pressure is raised briefly at the end of a pressure stability phase.
Claim 4
Dependent Claim
23 words
The method as claimed in claim 1 or 2, characterized in that the pressure build-up continues until another predetermined threshold value is reached.
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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) | 1993-02-12 | 1993-08-14 | 1994-02-13 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1997-02-12 | 1997-08-14 | 1998-02-13 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2001-02-12 | 2001-08-14 | 2002-02-13 | $7700.00 | Window Closed / Lapsed |