The dasheh control system is a key safety technology designed to work in conjunction with veto, halliburtons premier 15000 psi subsea. Our selfcontained unit is housed in a standard nema 4 epoxy painted carbon steel enclosure. A second look at electrohydraulic motion control systems. Electrohydraulic control technology introduction hydraforce. It can also be mounted remotely in a separate enclosure. The turbine electro hydraulic governor ehg control system controls steam flow to the turbine thorough a series of servodriven electrohydraulic valves. Our original pid control system with a builtin microprocessor has achieved accurate controllability. Electrohydrostatic actuators ehas, replace hydraulic systems with selfcontained actuators operated solely by electrical power.
It processes the inputs and converts them into a defined output to the hydraulic system. Designing a hydraulic control system involves several design considerations and tradeoffs. The main ehc system control logic, shown in figure 3. Hydraulic system designers should realize early in the design process that a power unit providing constant pressure to the control valve is best suited to the motion. Electronic control in mobile equipment can consist of the following. These inputs can be defined as the user interface, and can consist of joysticks, potentiometers, operator panels, or other input devices. Servo valves can provide precise control of position, velocity, pressure, and force with good post movement damping characteristics. The double feedback system of the sensed tilting angle and. General electric systems technology manual chapter 3. The controller can have the ability to engage in twoway communications with a bus system for example. The advantages are robustness, high efficiency, energy efficiency as well as a dynamic and highly accurate regulation. The rexrothsydfe is an electrohydraulic control system based on an axial piston variable displacement pump for controlling pressure, flow and power without throttling losses in the energy line.
These inputs can be defined as the machine interface, and can consist of pressure transducers, temperature sensors, flow sensors, velocity sensors or rpm sensors. This technology originally was developed for the aerospace industry but has since expanded into many other industries where hydraulic power is commonly used. Outputs can be onoff voltage signals or proportional pwm signals to control the hydraulic valving. Servo valves are often used to control powerful hydraulic cylinders with a very small electrical signal.
Hydraulic and electrohydraulic control systems springerlink. Electrohydraulic control systems kawasaki heavy industries, ltd. System analysis of electrohydraulic control systems. Ehas eliminate the need for separate hydraulic pumps and tubing, simplifying system architectures and improving safety and reliability. Pdf due to the advantages of hydraulic systems with volume control and because of the widespread use of axial piston pump with variable. It includes a 100% duty cycle electric motor, motor starter, hydraulic pump and reservoir, directional control valves and electrical controls. The ati compact electrohydraulic control system ehcs is directmounted to ati springreturn, doubleacting linear and quarterturn actuators. Since the founding of automation technology ati more than. Electrohydraulic control systems bosch rexroth usa. An electrohydraulic servo valve is an electrically operated valve that controls how hydraulic fluid is sent to an actuator. An introduction to proportional and servo hydraulics if you want to keep up with where hydraulics is heading now and in the future, then this is essential knowledge. The ehc system has both electronic and hydraulic parts. The mitsubishi turbine ehg control system can be applied to a variety of turbine generator system designs.