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| Number | Title | Issue Date |
| 8056332 | Method for activating an actuating means A method for controlling an actuating device in an automated shifting system of a motor vehicle. The position of the actuating device is determined by a path measurement system. The actuating device can be controlled by a pressure regulation device, including a pres... | 11/15/2011 |
| 7533527 | Hydraulic drive device for work machine A primary object is to provide a hydraulic drive device for a work machine that is capable of optimum control of pump absorption horsepower according to a change of working condition, thereby reducing fuel consumption, and a secondary object is to provide a hydrauli... | 05/19/2009 |
| 7469535 | Hydraulic driving control device and hydraulic shovel with the control device A hydraulic operation controlling unit where the engine can be driven stably at a target output torque point and reduction in the work speed can be prevented at the time of light load, includes an engine control unit controlling the output of an engine, so that the ... | 12/30/2008 |
| 7441407 | Hydraulic drive control device A hydraulic drive control device which is capable of translating the effect of oil pressure loss reduction into the effect of fuel consumption reduction that is very real to the user. The hydraulic drive control device has (i) a driving hydraulic circuit for driving... | 10/28/2008 |
| 7357215 | Steering apparatus for electric industrial vehicle A controller controls right and left wheel drive motors based on a tire angle detected by a tire angle sensor such that the angular velocities of a pair of drive wheels about the center of a turn of the vehicle are equal to each other. The controller determines a st... | 04/15/2008 |
| 7357750 | Differential assembly and transaxle including it A transaxle comprising a transmission, a pair of coaxial axles, a deceleration assembly for decreasing output rotational speed of the transmission, a differential assembly for transmitting power from the deceleration assembly to the pair of axles, and a common housi... | 04/15/2008 |
| 7337869 | Hydraulic hybrid vehicle with integrated hydraulic drive module and four-wheel-drive, and method of operation thereof A vehicle includes an integrated drive module coupled to an axle thereof. The module includes a hydraulic motor configured to provide motive power at an output shaft, and a differential for distributing the motive power to right and left portions of the axle. The hy... | 03/04/2008 |
| 7310943 | Hydrostatic transmission controls with alternative operating modes A hydrostatic transmission on a tractor is operated by a microcontroller providing current commands to the hydrostatic transmission pump, and manual controls that provide signals to the microcontroller so the current commands cause the hydrostatic transmission to op... | 12/25/2007 |
| 7210292 | Hydraulic system having variable back pressure control A hydraulic system for a work machine having a linkage system is disclosed. The hydraulic system has a tank configured to hold a supply of fluid and at least one hydraulic actuator associated with the linkage system to affect movement of the linkage system. The at l... | 05/01/2007 |
| 7191594 | Hydrostatic stepless transmission A hydrostatic stepless transmission comprises a hydraulic pump and a hydraulic motor, at least one of the hydraulic pump and motor being variable in displacement; a closed circuit for fluidly connecting the hydraulic pump and motor to each other therethrough, the cl... | 03/20/2007 |
| 7114430 | Adaptive position determining system for hydraulic cylinder A position determining system may include a hydraulic cylinder and a flow control device operatively connected to the hydraulic cylinder. A controller may be configured to supply an actuating signal to the flow control device. The controller may be configured to mon... | 10/03/2006 |
| 7086227 | Hydrostatic vehicle driving system applicable to a working vehicle A hydrostatic vehicle driving system structured from an engine to a drive axle in a working vehicle. A hydraulic pump driven by the engine and a variable displacement hydraulic motor for driving the drive axle are fluidly connected with each other through a hydrauli... | 08/08/2006 |
| 7083014 | Drive device for a machine with a traction drive system and a hydraulic work system A drive device is provided for a machine with a traction drive system and a hydraulic work system. The traction drive system has a drive axle and the hydraulic system has at least one electric motor and at least one pump driven by the electric motor. The electric mo... | 08/01/2006 |
| 7077158 | Velocity head compensated valve assembly A valve assembly includes a valve body configured to define a chamber forming a primary flowpath between an inlet port and a discharge port, an isolator disposed inside said chamber, and a poppet having a bore. The isolator is defined by a skirt and a stem, with the... | 07/18/2006 |
| 7066198 | Pressurized fluid controller using tilt / push / pull operator An intuitive pressurized fluid controller using tilt/push/pull (3 axis) operator includes a swivel joint such that it can move axially and tilt. A first array of valves is arranged to be activated as the lever tilts. A second array of valves is arranged so they can ... | 06/27/2006 |
| 7040090 | Servo steering system for motor vehicles For a power assisted steering system for vehicles, in particular passenger cars, there is provided a hydraulic circuit with a servopump, a three-way flow regulator valve which is located at the junction between the pump and a servoactuator and has a measuring thrott... | 05/09/2006 |
| 7007466 | System and method for controlling hydraulic flow A method is provided for controlling hydraulic flow to a hydraulic actuator in fluid communication with a pump. The method includes generating a signal representative of a speed of the pump and selecting a relationship from a plurality of relationships between valve... | 03/07/2006 |
| 6996982 | Method and device for switching hydraulic fluid supplies, such as for a hydraulic pump/motor A spool valve includes a first valve port coupled to a fluid source at a first pressure range, a second valve port coupled to a fluid source at a second, lower, pressure range, and first and second output ports coupled to a hydraulic device. The valve includes a val... | 02/14/2006 |
| 6988362 | Hydrostatic stepless transmission A hydrostatic stepless transmission comprises a hydraulic pump and a hydraulic motor, at least one of the hydraulic pump and motor being variable in displacement; a closed circuit for fluidly connecting the hydraulic pump and motor to each other therethrough, the cl... | 01/24/2006 |
| 6965822 | Work vehicle including startup control current calibration mechanism for proportional control systems A method of calibrating the control current startup threshold in a proportionally controlled drive system for a work vehicle is disclosed. To determine a current threshold value for use in the system a control current exhibiting a relatively low value is first appli... | 11/15/2005 |
| 6925799 | Speed control apparatus for hydraulic actuator The speed control apparatus for a hydraulic actuator includes a hydraulic source, an actuator connected with the hydraulic source and driven based on a supply of an operation oil, a direction switching valve which is switchably installed in a flow path between the h... | 08/09/2005 |
| 6668549 | Hydrostatic vehicle driving system applicable to a working vehicle A hydrostatic vehicle driving system structured from an engine to a drive axle in a working vehicle. A hydraulic pump driven by the engine and a variable displacement hydraulic motor for driving the drive axle are fluidly connected with each other through... | 12/30/2003 |
| 6550241 | Fluid-operated circuit for setting the top and bottom dead center location of the punch actuation cylinder in punching machines A fluid-operated circuit for setting the top dead center and the bottom dead center of the punch actuation cylinder in punching machines comprises a first copying distributor which distributes pressurized fluid, which has a spool at one end and can be con... | 04/22/2003 |
| 6446433 | Hydraulic control system for improving pump response and dynamic matching of pump and valve A hydraulic control system having a pump for delivering fluid under pressure from a fluid reservoir, a hydraulic actuator selectively driven by the fluid, the system comprises a main flow control valve connected between the pump and the actuator for selec... | 09/10/2002 |
| 6401456 | Method and device for controlling work machine An electro-hydraulic transducing valve (3a) and other elements associated with cylinder-controlling components, such as a control valve (3), are connected to the output end of a controller (23) adapted to perform control computation based on electric mani... | 06/11/2002 |
| 6202410 | Hydraulic system for forklift A hydraulic system for a forklift includes a handle angle sensor for outputting a rotational angle signal indicative of a rotational angle of a handle, a wheel angle sensor for outputting a wheel angle signal indicative of a steering angle of wheels, and ... | 03/20/2001 |
| 6065497 | Pneumatic control assembly A pneumatic control assembly for controlling a hydraulic power device includes a power control rod and at least one direction control rod. The power control is movable between an engaged position and a disengaged position to activate/de-activate a hydraul... | 05/23/2000 |
| 5887430 | Hydraulic source and hydraulic machine A hydraulic source(20) comprises a hydraulic pump(62) driven by a motor(61), which operates based on the power and control data from a non-contact power feeding apparatus(30); a hydraulic tank(63); a solenoid valve(64); a relief valve(65); a hydraulic pre... | 03/30/1999 |
| 5809780 | Hydraulic control valve A hydraulic control valve has a two position body shifted by rotation. The shaft of the valve body carries a drive wheel segment extending through an arc that corresponds to the shift angle of the valve. A spring is provided to bias, at least in the final... | 09/22/1998 |
| 5557930 | Drive unit having an electric motor In a drive unit which includes an electric motor and a cooling fan as well as a hydraulic power steering pump to be driven by the electric motor, the cooling fan is operatively connected to the motor by a clutch and a control circuit is provided for opera... | 09/24/1996 |
| 5419128 | Method of controlling speed reduction ratios of continuously variable transmission for automotive vehicles In order to achieve a gear ratio control of a continuously variable transmission, a transmission gear ratio is controlled based on a difference between an actual engine speed and a target engine speed to be set in response to a first parameter correspondi... | 05/30/1995 |
| 5398507 | Hydraulic circuit system This invention has for its aim to provide a hydraulic circuit system arranged such that, even at the time of commencement of drive of a hydraulic actuator with a large inertia, a slow rise in the drive pressure can be achieved, thereby preventing the occu... | 03/21/1995 |
| 5398506 | Control system for hydraulic pump system Electrically operated hydraulic pump systems are commonly used on tailgate loaders and small dump truck hoists. The systems include a switch which, when closed, couples the vehicle battery to the pump driving motor and a hydraulic lowering valve which, wh... | 03/21/1995 |
| 5335750 | Dual mode transmission control A street sweeping vehicle has a chassis supported on travel wheel units. An engine and an operator control compartment are on the chassis. A single hydrostatic transmission is on the chassis and is operatively connected to the engine and travel wheel unit... | 08/09/1994 |
| 5305782 | Pneumatic control valve system A pneumatic control valve system has a modulating valve and a piston. When the operator depresses the piston, pressure is communicated to a switching piston moving that piston to a switched position so that pressure is communicated to a switching outlet. ... | 04/26/1994 |
| 5251440 | Control apparatus and method for automatically controlling a hydraulic system for heavy construction equipment A control system for automatically controlling the operation of a hydraulic system for heavy construction equipment. The system of this invention provides a controller optimally connected to sensors and to control devices on the hydraulic system so that i... | 10/12/1993 |
| 5214916 | Control system for a hydraulic work vehicle An apparatus controls an electrohydraulic system of a work vehicle. The work vehicle has a engine, at least one fluid circuit having a variable displacement pump driven by the engine, and a plurality of control valves for controllably passing fluid from t... | 06/01/1993 |
| 5152143 | Hydraulic drive system A hydraulic drive system comprising a prime mover (21), a hydraulic pump (22) driven by the prime mover, a plurality of hydraulic actuators (23-28) driven by hydraulic fluid supplied from the hydraulic pump, a plurality of flow control valves (29-34) for ... | 10/06/1992 |
| 5138838 | Hydraulic circuit and control system therefor Hydraulic control of reversible hydraulic motors typically requires several different valves to provide for the various operating parameters. The subject hydraulic control circuit has only a pair of electrohydraulic control valves to provide all the typic... | 08/18/1992 |
| 5072648 | Control system for a fluid operated jack A control system for a fluid operated jack reduces the speed of retraction of a piston rod of the jack to an acceptable rate during a preselected range of operation by adding pressurized fluid flow to the fluid being exhausted from the jack through a rest... | 12/17/1991 |
