| Patent Number |
Title Of Patent |
Date Issued |
| 7406982 |
Hydraulic system control method using a differential pressure compensated flow coefficient |
August 5, 2008 |
| A hydraulic system has an electrohydraulic valve that controls flow of fluid to operate a hydraulic actuator, such as a cylinder or motor. A set of characterization data is provided which describes performance of the electrohydraulic valve as a function of changes in differential pressur |
| 7377480 |
Electrohydraulic valve servomechanism with adaptive resistance estimator |
May 27, 2008 |
| A servomechanism includes a controller which dynamically estimates the resistance of the solenoid coil in an electrohydraulic valve as part of determining a level of electric voltage to apply to open the valve. The servomechanism receives a current setpoint designating a desired electric |
| 7373869 |
Hydraulic system with mechanism for relieving pressure trapped in an actuator |
May 20, 2008 |
| Pressure trapped in an inactive hydraulic actuator can result in the actuator moving in a direction which is opposite to that desired upon subsequent activation. The present method detects a trapped pressure condition and takes remedial action before activating the hydraulic actuator |
| 6951102 |
Velocity based method for controlling a hydraulic system |
October 4, 2005 |
| A hydraulic circuit branch includes a hydraulic actuator, such as a cylinder, and an assembly of one or more electrohydraulic proportional valves connected in series between a pressurized fluid supply line and a tank return line. The force acting on the hydraulic actuator is determined |
| 6880332 |
Method of selecting a hydraulic metering mode for a function of a velocity based control system |
April 19, 2005 |
| The flow of fluid to a hydraulic actuator is controlled by a valve assembly which operates in different metering modes at various points in time. The metering mode to use in selected in response to the hydraulic load that acts on the valve associated with the hydraulic actuator. Specific |
| 6779340 |
Method of sharing flow of fluid among multiple hydraulic functions in a velocity based control s |
August 24, 2004 |
| A plurality of hydraulic actuators are connected between a supply line and a tank return line. A separate desired velocity is requested for each hydraulic actuator. In response to a respective metering mode and the desired velocity for each hydraulic actuator, the flow requirements that |
| 6775974 |
Velocity based method of controlling an electrohydraulic proportional control valve |
August 17, 2004 |
| An actuator is part of a hydraulic circuit branch that has a first electrohydraulic proportional valve connecting the actuator to a supply line containing pressurized fluid and a second electrohydraulic proportional valve connecting the actuator to a tank return line. A method for op |
| 6763661 |
Apparatus and method for providing vibration to an appendage of a work vehicle |
July 20, 2004 |
| An apparatus and method for creating vibration of an appendage of a work vehicle is disclosed. The apparatus includes a hydraulic cylinder, first and second valve assemblies, and a control element. The hydraulic cylinder is coupled between a first portion of the work vehicle and the appe |
| 6732512 |
Velocity based electronic control system for operating hydraulic equipment |
May 11, 2004 |
| A control system for operating a hydraulic system includes a user input device which generates an input signal indicating desired movement of a hydraulic actuator. A mapping routine converts the input signal into a velocity command indicating desired actuator velocity. A valve opening |
| 6718759 |
Velocity based method for controlling a hydraulic system |
April 13, 2004 |
| A hydraulic circuit branch includes a hydraulic actuator, such as a cylinder, and an assembly of one or more electrohydraulic proportional valves connected in series between a pressurized fluid supply line and a tank return line. The force acting on the hydraulic actuator is determined |
| 6705079 |
Apparatus for controlling bounce of hydraulically powered equipment |
March 16, 2004 |
| When a swinging boom driven by a hydraulic cylinder stops, inertia causes continued motion of the boom which increases pressure in a chamber of the hydraulic cylinder. Eventually that pressure reaches a level which causes the boom to reverse direction. Then pressure in an opposite cylind |
| 6018687 |
Method and apparatus for printing cutoff control using prepress data |
January 25, 2000 |
| A cutoff control system for controlling the positional relationship of a series of printed images on a continuous web of material relative to a cutoff device. The system includes a scanner for producing an output signal indicative of a suitable portion of the printed image on said web |
| 5813337 |
Closed-loop printing control system |
September 29, 1998 |
| A system for controlling the lateral position of a web in a web-fed printing press having a printing unit. The web has a series of printed images thereon. The system includes an optical scanner for sensing the lateral position of an image on the web and for generating a first signal. |
