Supervisory diagnostics for integrated vehicle stability system
First Claim
1. A method for performing a diagnostic check of an integrated vehicle stability system, said method comprising:
- providing at least one primary component and at least one secondary component for sensing an operation of at least one vehicle characteristic;
determining whether an output of the at least one primary component and an output of the at least one secondary component are valid;
comparing the output of the at least one primary component and the output of the at least one secondary component to determine whether a difference between the outputs is below a predetermined threshold;
determining whether a bias of the at least one primary component and a bias of the at least one secondary component is below a predetermined limit; and
putting the vehicle stability system in a fail-safe mode if the at least one primary component or the at least one secondary component is not outputting a valid signal, if the bias of the at least one primary component and the at least one secondary component is above the predetermined limit, or the difference between the outputs of the at least one primary component and the at least one secondary component is greater than the predetermined threshold.
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Accused Products
Abstract
A supervisory diagnostics system and related method for providing vehicle diagnostics for an integrated vehicle stability system that monitors the state of health of sensors, actuators, vehicle sub-system and communication sub-systems that are used in the stability control system. The diagnostics system employs an algorithm to determine whether the various sensors, actuators and sub-systems are operating properly. The algorithm determines whether the components and sub-systems are outputting valid signals at a component level. The algorithm also determines whether a bias of the sensors is below a predetermined limit. The algorithm further determines whether a comparison between the outputs of redundant sensors is below a predetermined threshold for a predetermined period of time. The system also performs a state of health analytical comparison of all the system signals. The system will go in to a fail-safe mode if a fault is detected.
41 Citations
24 Claims
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1. A method for performing a diagnostic check of an integrated vehicle stability system, said method comprising:
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providing at least one primary component and at least one secondary component for sensing an operation of at least one vehicle characteristic; determining whether an output of the at least one primary component and an output of the at least one secondary component are valid; comparing the output of the at least one primary component and the output of the at least one secondary component to determine whether a difference between the outputs is below a predetermined threshold; determining whether a bias of the at least one primary component and a bias of the at least one secondary component is below a predetermined limit; and putting the vehicle stability system in a fail-safe mode if the at least one primary component or the at least one secondary component is not outputting a valid signal, if the bias of the at least one primary component and the at least one secondary component is above the predetermined limit, or the difference between the outputs of the at least one primary component and the at least one secondary component is greater than the predetermined threshold. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10)
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11. A method for performing a diagnostics check for an integrated vehicle stability system, said method comprising:
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providing a first yaw rate sensor and a second yaw rate sensor for sensing a yaw rate of the vehicle; providing a first lateral acceleration sensor and a second lateral acceleration sensor for sensing the lateral acceleration of the vehicle; measuring a road wheel angle of the vehicle; determining whether the first and second yaw rate sensors, the first and second lateral acceleration sensors and the road wheel angle measurement are outputting valid signals; determining whether a bias of the first and second yaw rate sensors, a bias of the first and second acceleration sensors and a bias of the road wheel measurement are below a predetermined limit; comparing outputs of the first and second yaw rate sensors to determine whether the difference between the outputs of the first and second yaw rate sensors is below a predetermined threshold; comparing outputs of the first and second lateral acceleration sensors to determine whether the difference between the outputs of the first and second lateral acceleration sensors is below a predetermined threshold; and putting the vehicle stability system in a fail-safe mode if the first and second yaw rate sensor or the first and second lateral acceleration sensors or the road wheel angle measurement are not outputting a valid signal, or the bias of the first and second yaw rate sensors or the bias of the first and second lateral acceleration sensors or the bias of the road wheel angle measurement is above the predetermined limit, or the difference between the outputs of the first and second yaw rate sensors or the outputs of the first and second lateral acceleration sensors is greater than the predetermined threshold. - View Dependent Claims (12, 13, 14, 15)
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16. A diagnostics system for performing a diagnostics check for an integrated vehicle stability system, said diagnostics system comprising:
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at least one primary component and at least one secondary component for sensing the operation of at least one vehicle characteristic; means for determining whether the at least one primary component and the at least one secondary component are outputting a valid signal; means for comparing an output of the at least one primary component and an output of the at least one secondary component to determine whether a difference between the outputs of the components is below a predetermined threshold; means for determining whether a bias of the at least one primary component and the at least one secondary component is below a predetermined limit; and means for putting the vehicle stability system in a fail-safe mode if the at least one primary component or the at least secondary component are not outputting a valid signal, if the bias of the at least one primary component and the at least one secondary component is above the predetermined limit, or the difference between the outputs of the at least one primary component and the at least one secondary component is greater than the predetermined threshold. - View Dependent Claims (17, 18, 19, 20, 21, 22, 23, 24)
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Specification