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| Number | Title | Issue Date |
| 7269947 | Vibration control method and vibration control system for fluid pressure control circuit A first fluid channel for operating an actuator and a second fluid channel for operating an actuator are connected to a boom cylinder, including a boom rod side line, a boom head side line. A first and second supply line and a first and second discharge line of each... | 09/18/2007 |
| 7252029 | Hydraulic tilting device for tilting the cab of a vehicle A hydraulic tilting device for tilting the cab of a vehicle between a driving position, in which the vehicle can be driven normally, and a tilted position, in which, for example, maintenance can be carried out on a vehicle engine positioned beneath the cab. The tilt... | 08/07/2007 |
| 7059126 | System for preventing swing wag for a work machine with a boom assembly A swing cushion system of a work machine includes a directional flow device having a directional control member, a control device coupled to the directional flow device that outputs a signal to the directional flow device to shift the directional control member to d... | 06/13/2006 |
| 6736094 | VCT solenoid dither frequency control A method that uses a dither signal for reducing hysteresis effect in a variable cam timing system is provided. The method includes the steps of: a) providing a dither signal having at least two switchable frequencies; b) determining the frequency characteristics of ... | 05/18/2004 |
| 5313873 | Device for controlling the flow of fluid to a fluid unit A fluid unit, for example a piston/cylinder unit, is supplied with fluid via a cyclically opened or closed on/off valve. The vacuum peaks occurring on the outlet side of the on/off valve when it is closed and the inertia forces of the flowing fluid are us... | 05/24/1994 |
| 5284220 | Pressure control valve assembly for hydraulic circuit and automotive rear wheel steering system utilizing the same In a pressure control valve, a filter member is disposed in a feedback path for feeding back fluid pressure in the corresponding control port to a pilot chamber for feedback controlling a position of the valve spool in cooperation with an electric or elec... | 02/08/1994 |
| 5222417 | Hydraulic control system of an automatic transmission for a motor vehicle A solenoid operated control valve in an automatic transmission is operated by dither current. A flow rate of oil through the solenoid operated control valve is calculated. At least either one of the frequency and amplitude of the dither current is correct... | 06/29/1993 |
| 5046312 | Swivel speed control circuit for working vehicle A hydraulic circuit for controlling the deck swiveling speed of a working vehicle comprises a hydraulic actuator for driving the swivel deck, a flow control valve for controlling a rate of oil flow to the hydraulic actuator, and a direction control valve ... | 09/10/1991 |
| 4951468 | Method of determining duty ratio used for operational control of a solenoid A duty ratio for operating a solenoid is determined by calculating a duty ratio in each of basic periods and determining an operational time for which the solenoid is to be operated within each of the basic periods, based on the calculated duty ratio. Whe... | 08/28/1990 |
| 4947734 | Method of duty-ratio control for hydraulically actuated slip control lock-up clutch and transmission A hydraulic control method which includes a step of changing the time rate of introduction per a predetermined unit time of pressurized oil into an oil passage connected to a hydraulically-operated load device, such as a clutch of an automatic transmissio... | 08/14/1990 |
| 4838037 | Solenoid valve with supply voltage variation compensation A solenoid valve used as an expansion valve in a refrigeration circuit has an opening that varies as a function of the pulse width of a high frequency PWM (pulse width modulated) control signal. A transistor controls the electrical current delivered to th... | 06/13/1989 |
| 4765225 | Digitally controlled air-over-hydraulic actuator and method A digitally controlled air-over-hydraulic actuator includes a pneumatic cylinder and a hydraulic cylinder each having a separate piston and a common connecting rod. The pneumatic piston applies force to the connecting rod urging movement of the hydraulic ... | 08/23/1988 |
| 4757746 | Method of and apparatus for control of a force applied to or the position assumed by a work effecting element A control for a press for controlling the flow of fluid to two hydraulic actuators which applies a desired working force to or which positions the press platen in a desired position including a sub-control for introducing first and second super-imposed os... | 07/19/1988 |
| 4730541 | Non contacting electro-pneumatic servo for vibration isolation A sensing system for a vibration isolation table. A sensor responsive to the position of the tabletop is spaced apart from the tabletop and provides an output corresponding to the position of the tabletop. The output is modified to provide a control signa... | 03/15/1988 |
| 4662605 | Spool drive for pressure regulating, proportional solenoid valve A pressure regulating spool valve 10 having a body 25 within which a spool 20 is moved in a dither motion by a proportional solenoid 15 has a spool land 40 separating high and low pressure fluids and spanning and cooperating with a regulated port recess 5... | 05/05/1987 |
| 4561343 | Sequencing valve mechanism A sequencing valve mechanism utilized to control a pneumatic or hydraulic pressure medium from an on/off type pressure source to a two-chambered pneumatic or hydraulic appliance is disclosed. A pawl on a ratchet arm is driven around a ratchet island by th... | 12/31/1985 |
| 4558569 | Stuck pushbutton contingency operation for a steam turbine control system A steam turbine control system which includes a manual panel with pushbuttons for operator control of the steam admission valves. Each valve has its own control means and is responsive to pushbutton activation to govern its valve movement. If a pushbutton... | 12/17/1985 |
| 4554788 | Turbine valve control system Hydraulically operated turbine steam admission valves wherein each valve has its own microcomputer control. In the event the valve gets stuck due to possible contamination in the hydraulic system, the microcomputer control provides an oscillatory control ... | 11/26/1985 |
| 4481768 | Pneumatic control system for machines A pneumatic control system for machines that provides precise incremental or continuous direction, position, velocity and acceleration control of a variety of machine functions, such as rotary or linear motions, tool positioning and the like. A compressed... | 11/13/1984 |
| 4370714 | Electronically actuated brake system A pulse width modulated control signal is applied to inlet and outlet solenoid valves in a closed fluid vehicle brake system. The electronic actuating circuitry can control a fluid brake system in a towed vehicle from a towing vehicle without fluid connec... | 01/25/1983 |
| 4262784 | Device with a jack for controlling a gear box synchromesh, and method for using same A method and device for controlling the fork of a synchromesh for a gear box. A command signal sent by the operator is converted into signals by a modulator whose output controls an electric valve to open and close several times in succession. The electri... | 04/21/1981 |
| 4227845 | Rolling rack control for automatic bale wagon A hydraulic control system for the rolling rack of a three table bale wagon wherein the rolling rack is movable along the third table for supporting tiers of bales deposited on the third table by the second table, the control system including a single act... | 10/14/1980 |
| 4218997 | Actuator devices The invention relates to an actuator device for a motor vehicle speed-responsive system, the device being operable to actuate the throttle valve or the like of the internal combustion engine of the vehicle. The actuator device comprises a bellows device d... | 08/26/1980 |
| 4204458 | Pulsator for hydraulic systems controlling actuating mechanisms The pulsator for hydraulic systems controlling actuating mechanisms has a housing accommodating a pusher made in the form of a piston with a rod, a delivery valve, a pneumatic piston displacing in the cavity connected to the pneumatic control system. Abov... | 05/27/1980 |
| 4131325 | Electrically controlled fluid brake system A vehicle braking system employs a fluid pressure operated device for engaging the brakes. Flow of liquid under pressure to this device is controlled by a solenoid inlet valve and escape of fluid is controlled by a solenoid outlet valve both of which are ... | 12/26/1978 |
| 3973399 | Demand compensated hydraulic system with pilot line dither A demand compensated hydraulic system includes a pump responsive to a pressurized fluid in a demand feedback pilot line. The pilot line is connected to sense fluid demand between a hydraulic motor and an associated control valve which is closed by servo f... | 08/10/1976 |
