A large amount of modern day new innovations target power efficiency. Including the hydraulic side of industry. The Division of Fluid and Mechanical Engineering Systems of Linköpings University in alliance with Volvo Construction Equipment has created a new hydraulic concept in regards to the control of cylinder loads in a wheel loader. The idea is different from today’s application, in which the cylinder load is managed using a valve, in the manner that the load is exclusively handled by a pump. To manage this system, an electrical feed back of operators required signal is needed. These signals need to be effectively interpreted to ensure that valve and the pumps perform the requested operation. The new system needs a unit that is capable of doing these operations in a manner that matches to the operating level of today’s hydraulically controlled system. The research seeks to build up a software system that solves this. This platform shall, besides performing the operators’ demands, monitor the system. The monitoring of the system is an important aspect due to security issues, but also when analyzing the systems functionality. The implementation of this software program will be carried out in a real-time computer having the ability to collect data, interpret it and then control the connected units of the system. Further work that is to be done is an energy consumption study of today’s hydraulic system, and based on this research, theoretically evaluate the new system. The study has generated a great understanding of an industrial mechanic machine, this in a level which includes a whole system. The wide range of this task has introduced analysis and development of both hydraul mechanical-, electrical- and software related systems. By having an understanding of these, both separate and in interaction together, a platform has been designed that shall facilitate the forthcoming advancement of energy efficient hydraulics…..
CHAPTER 1 INTRODUCTION
1.1 BACKGROUND
1.2 PROBLEM DESCRIPTION
1.3 AIMS AND LIMITATIONS
CHAPTER 2 CONCEPTUAL STUDY
2.1 OVERVIEW L60E
2.2 TODAY’S HYDRAULIC SYSTEM
2.3 THE NEW HYDRAULIC SYSTEM
2.3.1 Semi-differential lowering mode
2.3.2 Valve Package
2.3.3 Open circuit system velocity control
2.3.4 Pumps – Parker P1/PD IDEC Pump
2.4 MEASURE, ANALYZE AND CONTROL UNIT
CHAPTER 3 HARDWARE AND SIGNALS
3.1 ELECTRICAL OPERATOR SIGNALS
3.2 INSTALLATION OF THE TRANSDUCERS
3.2.1 Pressure transducers
3.2.2 Position transducers
3.3 CAN
3.3.1 Overview of CAN
3.3.2 Connection to the L60’s CAN
3.4 VALVE PACKAGE CONTROL
3.5 MAC
3.5.1 Connections and connectors
3.5.2 Voltage Regulators
3.5.3 Router
3.5.4 CompactRIO
CHAPTER 4 SOFTWARE SYSTEM
4.1 LABVIEW
4.1.1 FPGA
4.1.2 Target
4.1.3 Host
4.1.4 System Communication
4.1.5 Measurement and Automation Explorer
4.2 IMPLEMENTED CONTROLLERS
4.2.1 Valve Controller
4.2.2 Pump Controllers
CHAPTER 5 EXPERIMENTS
5.1 CYLINDER AND FRAMEWORK FRICTION
5.1.1 Objectives
5.1.2 Method
5.1.3 Determining Ff
5.1.4 Test performance
5.1.5 Analysis and results
5.2 LOSSES DUE TO CONNECTORS
5.3 FUNCTIONALITY TEST – LOWERING OF LOAD
5.4 ENERGY ANALYZE OF TODAY’S WORKING HYDRAULICS
5.4.1 Objectives
5.4.2 The short duty cycle
5.4.3 Method
5.4.4 Test performance
5.4.5 Preparation of saved data – datagen
5.4.6 Power calculations – calc_power
5.4.7 Total energy consumption – calc_energy
5.4.8 Analysis and results
5.5 VALVE TESTS…..
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Source: Linköping University
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