Electrohydraulic Controls for Mobile Equipment & Vehicles

I.D. #

C1011

Duration

3 Days

Electrohydraulic technologies have been utilized in aerospace and industrial applications for well over fifty years. Already mature in such applications as ABS and traction control, electrohydraulics continues to be used in newer applications such as electronic stability control and active and semi-active suspensions. In off-highway applications, designers are using electrohydraulics in a wide range of applications, from simple pump control to complex brake systems found on agricultural tractors and construction equipment. Additionally, with the acceptance of digital engine controllers for emissions control, engineers are increasingly looking to utilize electrohydraulics to improve vehicle ease of use, safety, and performance. As more electronics are used in mobile applications, there is a greater need for engineers, managers, and technicians to understand electrohydraulic technologies.

This three-day seminar examines the systems and component level details needed to better understand how the cross-functional disciplines of electrical, mechanical, and fluid power engineering are utilized to offer performance and functional advantages through electrohydraulic technologies. Using a systems engineering block diagram approach, key components covered in this seminar include electromechanical actuation, electronic controllers, networks, valves, and sensors. In each section, examples of existing products are shown and elements of risk are discussed. This course also examines environmental specifications and fluid issues that are specific to electrohydraulics.

Learning Objectives

By attending this seminar, you will be able to:

Identify the key building blocks of electrohydraulic systems
Specify important characteristics of electrohydraulic valves, sensors, and electronic controllers
Read and create hydraulic schematics using electrohydraulic symbols
Recognize the critical issues in designing and troubleshooting electrohydraulic systems
Identify the risks associated with electrohydraulic systems and means to overcome them.

Who Should Attend

This course is designed for individuals engaged in mechanical, electrical, and fluid power engineering that are new to the technical field of electrohydraulics. Additionally, technicians, program managers, and sales engineers requiring knowledge of electrohydraulic components and systems will benefit from attending this seminar.

Prerequisites

An undergraduate engineering degree or a strong technical background is highly recommended. A basic knowledge of college algebra, college physics, and familiarity with hydraulics is also recommended but not required.

Seminar Content

DAY ONE

What is Electrohydraulics?
Power Density
- Hydraulics comes out on top
Review Physical Principles
- Inductance
- Electromotive Force
- Pascal's law
- Hall Effect
- Resistive elastic properties used in strain gauges
- Magnetostrictive Principle
- Fluid Viscosity
Control of Power
- Mechanical Power
- Hydraulic Power
- Electrical Power
Block Diagrams - System Approach
- Simple mechanical system
- Simple hydraulic system
- Simple electric System
- Electrohydraulic system (Open Loop)
- Electrohydraulic system (Closed Loop)
Actuators
- Linear actuators
- Rotary actuators
EH Control Devices
- EM Devices -- Solenoids; Torque motors; Stepper motors; DC motors
- Valves -- Pressure relief; Pressure reducing; Flow control
- Pumps
- Motors
- Rheological Fluids
- Fluid Issues -- Viscosity; Tribology - Friction, lubrication & wear; Cleanliness - ISO ratings; Hygroscopic vs. Hydrophobic properties; Special issues water-based fluids

DAY TWO

Feedback Devices
- Position Transducer -- Linear Pot; LVDT (Linear Variable Differential Transformer); Magnetostrictive; Encoder; Resolver; Infrared & Radar
- Speed Sensors -- Hall Effect; Variable Reluctance; Ground Speed Radar
- Force Sensors
- Torque Sensors
- Accelerometers
- Yaw Rate
- Pressure Transducers
- Pressure Switches
- Flow Meters
- Fluid Level Sensors
- Temperature Sensors
Controller
- Valve drivers
- Pulse width modulation of solenoids
- Dither
- Digital controllers -- Microprocessors vs. Microcontrollers
- Safety Integrity Level (SIL)
- Inputs -- Power; Analog; Discrete; Frequency
- Outputs -- Regulated Power; PWM Drivers; Discrete Devices
- Networks -- ISO Seven Layer Model; Common Protocols

DAY THREE

Environmental Considerations
Electrical
- EMC/EMI
- ESD -- Electrostatic Discharge
- Voltage transients
- Wiring considerations
- Connectors
Mechanical
- Temperature
- Shock & vibration
- Humidity
- Fluid compatibility
- Altitude
- IP rating system
- Submersion
- Cleaning
Suppliers
- Off-Highway Controllers
Command Devices
- Joysticks
- Foot pedals
- Switches
- Operator input controls
ISO Symbols for EH Devices
EH Examples
- Proportional valves and servo valves
- Pumps
- Pressure reducing valves
- 6 DOF motion simulators
- Hydrostatic drive control
- Hydrostatic regenerative braking
- Suspension product
- X by wire

Instructor(s):

David E. Ewel

David Ewel is the President of Dewel, LLC, a company specializing in the design, manufacturing, and marketing of hydraulic and mechanical devices that utilize embedded electronic technology for mobile markets. With over thirty years experience in the field of electrohydraulics, Mr. Ewel previously held the position of Director of Engineering at MICO, Inc. where he was responsible for the development of a wide range of components for brake-by-wire and the development of ABS, traction control and electronic stability control systems for 4X4, 6X6 and 8X8 vehicles. While at the Hydraulics Division of Eaton Corp., Mr. Ewel held the positions of Chief Engineer for Electronics and Chief Engineer for Valves and led the development of electro-proportional and CAN based pump controls. As an engineer at Moog, Inc., he designed the first industrial servoactuator that integrated a cylinder, servovalve and position sensor with embedded electronics. Other designs included embedded ramp control of a proportional valve and embedded closed loop position control of a servovalve. In addition, Mr. Ewel has worked on a wide variety of servosystem designs to control position, velocity, force, and pressure in such diverse applications as lumber and steel mills, earthquake simulators, turbine gas valve control and active suspensions. Mr. Ewel received both a B.S. in Mechanical Engineering and a M.B.A. from the State University of New York at Buffalo.

Fees:

$1545

SAE Members*:

$1236 - $1391

* The appropriate SAE Member discount will be applied through the Registration process. Discounts vary according to level of membership: Elite Member 20%; Premium Member 15%; Classic Member 10%

CEU