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Integrated hierarchical process for fault detection and isolation

A fault detection, failure technology, applied in the direction of transportation and packaging, data exchange through path configuration, circuit or fluid pipeline, etc.

Inactive Publication Date: 2011-05-04
GM GLOBAL TECH OPERATIONS LLC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In other words, a diagnostic code may be set because of improper operation of a subsystem or component, but that operation may be the result of improper operation of another subsystem or component

Method used

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  • Integrated hierarchical process for fault detection and isolation
  • Integrated hierarchical process for fault detection and isolation
  • Integrated hierarchical process for fault detection and isolation

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Embodiment Construction

[0011] The following discussion of embodiments of the invention, which relate to systems and methods for confident estimation of whether a subsystem or component of a vehicle is identified as the root cause of a particular failure, is merely exemplary in nature and in no way intended to limit the invention, its application or use.

[0012] The present invention proposes a process for determining the root cause of a vehicle failure by using multiple models and observations. Each model provides a confidence estimate about the observations of potential failure conditions. As described in detail below, the present invention may use hierarchical trees to analyze diagnostic codes and other signals from subsystems and components. Each level of the hierarchical tree accesses the information it has before making a decision. Information from different branches of the tree can be dynamically changed based on vehicle information, such as speed dependencies. Model confidence estimates m...

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Abstract

A system and method for determining the root cause of a fault in a vehicle system, sub-system or component using models and observations. In one embodiment, a hierarchical tree is employed to combine trouble or diagnostic codes from multiple sub-systems and components to get a confidence estimate of whether a certain diagnostic code is accurately giving an indication of problem with a particular sub-system or component. In another embodiment, a hierarchical diagnosis network is employed that relies on the theory of hierarchical information whereby at any level of the network only the required abstracted information is being used for decision making. In another embodiment, a graph-based diagnosis and prognosis system is employed that includes a plurality of nodes interconnected by information pathways. The nodes are fault diagnosis and fault prognosis nodes for components or sub-systems, and contain fault and state-of-health diagnosis and reasoning modules.

Description

technical field [0001] The present invention relates generally to a system and method for determining the root cause of a fault in a vehicle system, and more particularly to a system and method for determining the root cause of a fault in a vehicle system and isolating the fault, wherein the system and method uses hierarchical Multiple models and observations in a tree to provide a confident estimate of a specific failure source. Background technique [0002] Modern vehicles include many electrical vehicle systems, such as vehicle stability control systems. For example, some vehicle stability systems utilize automatic braking in response to non-ideal turns or yaws of the vehicle. Some vehicle stability systems utilize active front or rear wheel steering to assist the vehicle operator in steering the vehicle in response to detected rotation of the steering wheel. Some vehicle stability systems utilize active suspension systems to alter the vehicle suspension in response to ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B60W50/02B60R16/02B60W50/04H04L12/28B60W30/02
CPCB60Q11/00B60R2021/01184B60W30/02B60W50/0205
Inventor M·N·豪厄尔M·A·萨尔曼X·唐X·张Y·张Y-K·钱W·C·林R·I·德布克S·W·霍兰S·查克拉巴蒂R·舒古尔
Owner GM GLOBAL TECH OPERATIONS LLC
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