Active brake control diagnostic
First Claim
1. 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.
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Accused Products
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.
169 Citations
14 Claims
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1. 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:
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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. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8)
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9. 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:
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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. - View Dependent Claims (10, 11, 12, 13, 14)
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Specification