Independent Metering Electro-Hydraulic Control System

✍ Scribed by Ruqi Ding, Min Cheng

• Publisher: Springer
• Year: 2024
• Tongue: English
• Leaves: 159
• Category: Library

✦ Synopsis

This book shows an independent metering electro-hydraulic control system involving its flexible hardware layouts, complex software control, representative products and applications. The book includes one chapter introducing the background and motivation of the independent metering electro-hydraulic control system. It also includes one chapter to summarize various hardware layouts involving the utilized hydraulic components and circuits, as well as analyze their advantages and disadvantages. It emphatically consists of four chapters demonstrating the detailed multivariable control strategies from three levels: load, valve and pump, together with fault-tolerant control under the fault condition. It includes a last chapter, in which products of independent metering control valve and their applications in some typical heavy-duty mobile machinery are collective works of reviews illustrative of recent advances. This book is interesting and useful to a wide readership in thevarious fields of fluid power transmission and control.

✦ Table of Contents

Foreword
Preface
Acknowledgments
Contents
1 Introduction
1.1 Background
1.2 Independent Metering Control System (IMCS)
1.3 Conclusion
References
2 Hardware Layout of Independent Metering Control
2.1 Introduction
2.2 Valve Component
2.3 Main-Stage Layout
2.4 Pilot Stage Configuration
2.5 Conclusions
References
3 Multi-Mode Load Control
3.1 Introduction
3.2 Multiple Operating Modes for the Actuator
3.3 Mode Switching Logic
3.3.1 Energy-Saving Characteristics
3.3.2 Force-Velocity Capability
3.3.3 Mode Switching Logic
3.4 Mode Transition Control
3.4.1 Problem Statement
3.4.2 Motivation for Bumpless Switch
3.4.3 Continuous Switching
3.4.4 Discrete Switching with the Bumpless Transfer
3.4.5 Bidirectional Latent Tracking Loop
3.5 Experiment Research
3.6 Conclusions
References
4 Multi-Variable Valve Control
4.1 Introduction
4.2 Independent Metering Valve Control Architecture
4.2.1 Control Structure
4.2.2 Modelling of Independent Metering Control System
4.2.3 Analysis of Interactions Between the Different Loops
4.2.4 Load-Independent Flow Control
4.2.5 Detailed Decentral Control Algorithm with Electronic PC
4.3 Damping Control
4.3.1 Problem Statement
4.3.2 Damping Control Design
4.3.3 Control Parameters
4.3.4 Self-Tuning Pressure-Feedback Control Based on Guaranteed Dominant Pole Placement
4.4 Experimental Tests
4.5 Conclusion
References
5 Pump-Valve Coordination Control
5.1 Introduction
5.2 Pump Control
5.2.1 Pressure Control
5.2.2 Flow Control
5.2.3 Power Control
5.2.4 Hybrid Control
5.3 Configuration of Pump-Valve Coordinate Control
5.4 Multi-Variable Control Design
5.4.1 Multi-Variable Controller Under Resistive Loads
5.4.2 Multi-Variable Controller Under Overrunning Loads
5.4.3 Pressure Matching
5.5 Energy-Saving Analysis
5.6 System Dynamic Analysis
5.7 Case Study
5.7.1 Startup Stage
5.7.2 Single Actuator Motion
5.7.3 Multi-Actuator Motion
5.8 Conclusions
References
6 Fault-Tolerant Control
6.1 Introduction
6.2 Normal Controller (NC)
6.2.1 MIMO System in the IMCS
6.2.2 Normal Control Design
6.3 Fault-Tolerant Control Against Valve Faults
6.3.1 Valve Fault-Tolerant Control (VFTC) Principle
6.3.2 Control Signal Reconfiguration (Parameter Degradation)
6.3.3 Control Loop Reconfiguration (Functional Destruction)
6.3.4 Operating Mode Reconfiguration (Flow Obstacle)
6.3.5 Design of the VFTC Decision Mechanism
6.4 Fault-Tolerant Control Against Sensor Faults
6.4.1 Sensor-Fault-Tolerant Control (SFTC) Principle
6.4.2 SFTC for the Supply Pressure Sensor
6.4.3 SFTC for the Inlet Pressure Sensor
6.4.4 SFTC for the Outlet Pressure Sensor
6.5 Stability Analysis
6.5.1 Stability of Switching from the NC to FTC
6.5.2 Bumpless Transfer from NC to FTC
6.6 Experimental Verification Under Valve Faults
6.6.1 Test 1
6.6.2 Test 2
6.6.3 Test 3
6.6.4 Test 4
6.6.5 Test 5
6.6.6 Effect of BT in VFTC Under Test 2
6.6.7 Comparison with Classical VFTC Under Test 2 and 3
6.7 Experimental Verification Under Sensor Faults
6.7.1 Experimental Results for the Sensor Fault Conditions
6.7.2 Experimental Effects of the SFTC
6.7.3 Effects of the Bumpless Transfer Controller
6.8 Conclusion
References
7 Industrial Application
7.1 Introduction
7.2 Commercial Independent Metering Valve
7.3 Conclusion
References