US5707117A
Expired / Lapsed
US
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Active brake control diagnostic
Assignee: BWI Co Ltd SA
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Filing: 1996-07-19
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Granted: 1998-01-13
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Expires: 2016-07-19
Abstract
Abstract A comprehensive diagnostic for an active brake control system for automatically increasing braking at selected wheels of an automotive vehicle in response to detected vehicle turning maneuvers provides a hierarchy of diagnostic procedures for diagnosing local transducer and transducer circuit fault conditions, for diagnosing lack of correlation between transducers and subsystems, and for diagnosing low system level performance. Transducers or subsystems are isolated and indicated as the source of diagnosed low system performance to facilitate fault treatment procedures. Active brake control system authority is automatically reduced for at least the duration of diagnosed fault conditions.
Inventors
- 👤 Hong Xing Hu
- 👤 Mutasim Abdurrahman Salman
- 👤 Michael Douglas Rizzo
- 👤 John E. Dickinson
- 👤 Douglass L. Carson
- 👤 Eldon Leaphart
- 👤 Steven Lee Tracht
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 04:03
CPC Classifications
B; B60; B60G; B60G17/00; B60G17/015; B60G17/018; B60G17/0185; B60T; B60T8/00; B60T8/32; B60T8/88; B60T8/885; B60T8/90; B60T2270/00; B60T2270/40; B60T2270/406; B60T2270/415
Claims Analysis
Total Claims: 16
Claim 1
Independent Claim
89 words
In an active brake control system including a plurality of active brake control system components cooperative to selectively increase braking at individual automotive vehicle wheels in response to sensed vehicle turning maneuvers, a diagnostic method comprising the steps of: diagnosing individual component fault conditions characterized by reduced component operability; diagnosing correlation fault conditions characterized by substantial lack of correlation between predetermined active brake control parameters; diagnosing performance fault conditions characterized by reduced active brake control system performance; and restricting active brake control system authority when fault conditions are diagnosed.
Claim 2
Dependent Claim
89 words
In an active brake control system including a plurality of active brake control system components cooperative to selectively increase braking at individual automotive vehicle wheels in response to sensed vehicle turning maneuvers, a diagnostic method comprising the steps of: diagnosing individual component fault conditions characterized by reduced component operability; diagnosing correlation fault conditions characterized by substantial lack of correlation between predetermined active brake control parameters; diagnosing performance fault conditions characterized by reduced active brake control system performance; and restricting active brake control system authority when fault conditions are diagnosed.
Claim 3
Dependent Claim
65 words
The method of claim 1, wherein the step of diagnosing individual component fault conditions further comprises the steps of: reading component output signals; establishing signal tolerances corresponding to the component output signals describing signal ranges of operable components; comparing the component output signals to the established signal tolerances; and diagnosing an individual component fault condition when a component output signal exceeds a corresponding signal tolerance.
Claim 4
Dependent Claim
63 words
The method of claim 1, wherein the step of diagnosing correlation fault conditions further comprises the steps of: normalizing the predetermined active brake control system parameters to a common unit of measure; determining a difference between the normalized active brake control system parameters; comparing the difference to a predetermined difference threshold; and diagnosing correlation fault conditions when the difference exceeds the difference threshold.
Claim 5
Dependent Claim
57 words
The method of claim 1, wherein the step of diagnosing performance fault conditions further comprises the steps of: establishing a minimum active brake control system response threshold; measuring actual response of the active brake control system; and diagnosing a performance fault condition when the actual response is less than the minimum active brake control system response threshold.
Claim 6
Dependent Claim
45 words
The method of claim 4, wherein the measuring step further comprises the steps of: generating an active brake control parameter error value; determining the time rate of decrease of the error value toward zero to indicate the actual response of the active brake control system.
Claim 7
Dependent Claim
32 words
The method of claim 4, wherein the measuring step measures a time of activation of the active brake control system as an indication of actual response of the active brake control system.
Claim 8
Dependent Claim
28 words
The method of claim 1, wherein the restricting step restricts active brake control system authority by temporarily disabling the active brake control system while fault conditions are diagnosed.
Claim 9
Dependent Claim
29 words
The method of claim 1, further comprising the steps of: indicating the diagnosed fault condition; and storing a fault code in a memory device describing the diagnosed fault condition.
Claim 10
Dependent Claim
109 words
A diagnostic method for an active brake control system for automatically increasing braking at selected wheels of an automotive vehicle in response to detected vehicle turning maneuvers, comprising the steps of: sampling input signals from a plurality of transducers; detecting a turning maneuver as a function of the sampled input signals; activating the active brake control system to increase braking at selected vehicle wheels upon detecting the turning maneuver; diagnosing transducer circuit fault conditions; diagnosing a lack of correlation fault condition between sampled input signals; diagnosing performance fault conditions in the active brake control system; and deactivating the active brake control system upon diagnosing any of said fault conditions.
Claim 11
Dependent Claim
109 words
A diagnostic method for an active brake control system for automatically increasing braking at selected wheels of an automotive vehicle in response to detected vehicle turning maneuvers, comprising the steps of: sampling input signals from a plurality of transducers; detecting a turning maneuver as a function of the sampled input signals; activating the active brake control system to increase braking at selected vehicle wheels upon detecting the turning maneuver; diagnosing transducer circuit fault conditions; diagnosing a lack of correlation fault condition between sampled input signals; diagnosing performance fault conditions in the active brake control system; and deactivating the active brake control system upon diagnosing any of said fault conditions.
Claim 12
Dependent Claim
24 words
The method of claim 9, wherein the sampled input signals from the plurality of transducers indicate yaw rate and vehicle lateral acceleration control parameters.
Claim 13
Dependent Claim
57 words
The method of claim 10, further comprising the steps of: estimating signal bias error in the sampled output signal for each of the plurality of transducers; comparing at least one signal bias error to a corresponding bias error limit; and diagnosing transducer circuit fault conditions when a signal bias error persistently exceeds its corresponding bias error limit.
Claim 14
Dependent Claim
60 words
The method of claim 10, wherein the step of diagnosing performance fault conditions further comprises the repeated steps of: logging a time of active brake control system activation in response to a detected turning maneuver; comparing the logged time to a predetermined time limit; and diagnosing a performance fault condition when the logged time persistently exceeds the predetermined time limit.
Claim 15
Dependent Claim
37 words
The method of claim 12, further comprising the steps of: isolating the source of the diagnosed performance fault condition; and storing a code indicating the performance fault condition and the isolated source of the performance fault condition.
Claim 16
Dependent Claim
74 words
The method of claim 9, wherein the step of diagnosing transducer circuit fault conditions further comprises the steps of: establishing, for each of a plurality of transducers, a corresponding transducer output signal tolerance range; comparing the sampled output signal from each of the plurality of transducers to the corresponding transducer output signal tolerance range; and diagnosing transducer circuit fault conditions when a sampled output signal persistently exceeds the corresponding transducer output signal tolerance range.
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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) | 2001-01-12 | 2001-07-14 | 2002-01-13 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2005-01-12 | 2005-07-14 | 2006-01-13 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2009-01-12 | 2009-07-14 | 2010-01-13 | $7700.00 | Window Closed / Lapsed |