Test signal generation for service diagnosis based on local structure graphs / Michael Ungermann.

Format:

Book

Author/Creator:

Ungermann, Michael, author.

Language:

English

Subjects (All):

Structural analysis (Engineering).

Physical Description:

1 online resource (193 pages) : illustrations

Edition:

1st ed.

Place of Publication:

Berlin : Logos Verlag Berlin, [2015]

Summary:

Long description: This work considers the problem of identifying the fault in a faulty dynamical system on the basis of the system's input and output signals only. For this purpose, a model-based method for the design of diagnostic tests which consist of specific input signals and appropriate residual generators is developed. The method extends the structure graph of dynamical systems in order to represent the couplings in a system which has been brought to a specific operating region. The resulting local structure graph is used to determine specific residual generators which can distinguish between faults on the basis of the system's input and output signals in the corresponding operating region. Algorithms to determine advantageous operating regions and input signals which drive the system into such operating regions are given. The application of the method to determine diagnostic tests is demonstrated using a typical automotive system, a throttle valve.

Contents:

Intro

1 Thesis Overview

1.1 Service Diagnosis

1.2 Contributions of This Thesis: Systematic Test Design Methods

1.3 Thesis' Outline

2 Introduction to Consistency-Based Service Diagnosis

2.1 Introduction to Service Diagnosis

2.2 Fault-Hypothesis Rejection

2.3 Sequential Refinement of the Diagnostic Result

2.4 Consistency-Based Diagnosis

2.5 Automatic Testing as Active Diagnosis

2.6 Literature Survey

2.6.1 Service Diagnosis

2.6.2 Active Diagnosis

2.6.3 Structural Analysis for Diagnosis

2.6.4 Structural Approaches to Active Diagnosis

2.7 Assumptions and Problem Statement for This Thesis

2.8 Summary

3 Modeling Framework

3.1 System-Behavior Representation by Constraint Sets

3.2 Behavioral Description of Dynamical Systems

3.3 Analytical Model of Dynamical Systems

3.3.1 System Variables

3.3.2 Constraint Types

3.3.3 Qualitative Fault Models

3.3.4 Elimination-Minimal Representation

3.4 Running Example: Plant A

3.5 Summary

4 Diagnosability Analysis by Means of Directed Structure Graphs

4.1 Chapter Overview

4.2 Consistency Tests with Global Residual Generators

4.3 I/O-Detectability

4.4 I/O-Discriminability

4.5 Global Structural Model of Dynamical Systems

4.5.1 Global Structure Graph

4.5.2 Canonical Decomposition of the Structure Graph

4.5.3 Global Structural Properties of Constraint Sets

4.6 Directed Global Structure Graph

4.6.1 Uniqueness of Constraints Solved for a Variable (Causality)

4.6.2 Directed Global Structure Graph

4.7 Determining Global Residual Generators

4.8 Global Structural Detectability and Discriminability

4.9 Limits of Global Structural Analysis

4.10 Summary

5 Analysis of Local Structure Graphs

5.1 Locality of Couplings and its Consequence for Diagnosis

5.2 Operating Region.

5.3 Additional Structural Properties Valid in Specific Operating Regions

5.4 Directed Local Structure Graph

5.5 Local Structural Properties of Constraint Sets

5.6 Local Residual Generator Design

5.7 Summary

6 Design of Diagnostic Tests

6.1 Extension to a Method for the Design of Automatic Tests

6.2 Automatic Test

6.3 Diagnostic Unit

6.4 Operating Region Detection

6.5 Decision Logic Design

6.5.1 Test Sensitivity

6.5.2 Hypothesis Rejection

6.6 Input Generator Design

6.7 Defining All Tests

6.8 Special Case: Fault Hiding

6.9 Summary

7 Application to a Throttle Valve

7.1 System Description

7.2 Analytical System Model

7.3 Global Structural Analysis

7.4 Test Generation

7.5 Simulation Study

7.6 Summary

8 Conclusions and Outlook.

Notes:

Description based on print version record.

PublicationDate: 20150506

ISBN:

3-8325-9598-8