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| Number | Title | Issue Date |
| 8024925 | Apparatus, system, and method for controlling a desired torque output Apparatus, system, and method for controlling a desired torque output on a hydromechanical transmission. Controlling torque output of a hydromechanical transmission provides improved operator feel and control. A control module determines a desired torque output and ... | 09/27/2011 |
| 7536856 | System for controlling a power output A system for controlling a power output is disclosed. The system includes a hydraulic actuator configured to output a first torque and a source of pressurized fluid configured to supply a flow of pressurized fluid to the hydraulic actuator. The system further includ... | 05/26/2009 |
| 7178334 | Hydrostatic vehicle drive system comprising a differential lock The invention relates to a hydrostatic vehicle drive system (1) comprising a first and a second hydraulic pump (2, 3), and a first and a second hydraulic motor (7, 12). Said hydraulic pumps (2, 3) and said hydraulic motors (7, 12) ... | 02/20/2007 |
| 7146263 | Predictive load management system A predictive load management system is provided. A power source is operable to generate a power output and has a desired operating range. A transmission has a drive member operably engaged with the power source and a driven member. A control system is operable to re... | 12/05/2006 |
| 7114432 | Torque limiting device for hydraulic piston pump A torque control for a hydrostatic piston pump that provides for a servo piston rod that is connected to the swashplate of the pump and connected to a servo piston within a first cavity that receives compensation pressure that urges the servo piston toward the swash... | 10/03/2006 |
| 7028470 | Apparatus for executing activities assisted by hydromotors and a hydraulic transformer for use in such an apparatus The invention relates to an apparatus for executing activities assisted by equipment driven by means of rotating or linear hydromotors. The hydromotors may be loaded and/or moved in two directions. The hydromotors are coupled via a connecting line and a hydraulic tr... | 04/18/2006 |
| 6945335 | Oil-pressure controlling device for earthmoving machine An optimal pump flow for both dual tilt operations and single tilt operations is obtained at low cost without increasing the complexity of the device constitution. Where there is a wish to implement a dual tilt operation, a switch is selectively operated and, in acc... | 09/20/2005 |
| 6938719 | Speed control system for wheeled hydraulic traveling vehicle Control valves are respectively provided in a pair of variable displacement hydraulic pumps. If an ultra low speed travel signal is issued in response to an ultra-low-speed switch turned on, one of the control valves is fixed to a neutral position by a solenoid valv... | 09/06/2005 |
| 6874318 | Automatic remote pressure compensation in an open circuit pump An open circuit system that uses a two-position three-way logic valve that automatically compensates for remote pressure in the system. The system has a pump that sends a pump supply through an orifice to the two-position three-way logic valve. Then depending on the... | 04/05/2005 |
| 6442934 | Hydraulic controller for variable capacity hydraulic transmission The present invention provides a hydraulic controller for a variable capacity hydraulic transmission. This hydraulic controller reduces the load of the engine to improve fuel efficiency while maintaining a hydraulic pressure which is necessary for the con... | 09/03/2002 |
| 6360537 | System for controlling a hydraulic vehicle drive In a hydraulic vehicle drive which has a hydraulic circuit consisting of a variable displacement pump (2) and a hydraulic motor (10), the variable displacement pump (2) is driven by a diesel engine (1). During the braking or overrunning operation of the v... | 03/26/2002 |
| 6298661 | Energy efficient hydraulic motor control system An aircraft flap drive system utilized a variable displacement motor (15) having a fluid pressure actuated device (23) to vary the displacement of the motor. The system includes a displacement control valve (41), and an electrohydraulic control means (55,... | 10/09/2001 |
| 5794437 | Regenerative adaptive fluid motor control A regenerative adaptive fluid motor control system integrating a load adaptive fluid motor control system and a load adaptive energy regenerating system having an energy accumulator. The fluid motor control system includes a primary constant displacement ... | 08/18/1998 |
| 5794442 | Adaptive fluid motor control A regenerative adaptive fluid motor output feedback control system integrating a load adaptive fluid motor output feedback control system and a load adaptive energy regenerating system having an energy accumulator. The fluid motor control system includes ... | 08/18/1998 |
| 5794441 | Adaptive fluid feedback control A regenerative adaptive fluid motor position feedback control system integrating a load adaptive flujid motor position feedback system having an energy accumulator. the fluid motor control system includes a primary variable displacement pump powering a sp... | 08/18/1998 |
| 5794440 | Adaptive fluid control A regenerative adaptive fluid motor control system integrating a load adaptive fluid motor control system and a load adaptive energy regenerating system having a built-in regenerating circuitry containing an energy accumulator. The fluid motor control sys... | 08/18/1998 |
| 5794439 | Regenerative adaptive fluid control A regenerative adaptive fluid motor control system integrating a load adaptive fluid motor control system and a load adaptive energy regenerating system having an independent regenerating circuitry containing an energy accumulator. The fluid motor control... | 08/18/1998 |
| 5794438 | Adaptive fluid motor feedback control A regenerative adaptive fluid motor position feedback control system integrating a load adaptive fluid motor position feedback control system and a load adaptive energy regenerating system having an energy accumulator. The fluid motor control system inclu... | 08/18/1998 |
| 5634335 | Hydrostatic transmission with brake valve The invention relates to a hydrostatic transmission having a hydraulic pump (1) and an adjustable hydraulic motor (2) which is connected to first and second working lines (13, 14) of which at least the first (13) leads to the hydraulic pump, and a setting... | 06/03/1997 |
| 5353593 | Bootstrap hydraulic systems The present invention is directed to a hydro-mechanical or electro-hydro-mechanical control system utilized for positioning a mechanical device. The control system incorporates a control valve for selectively controlling the flow of hydraulic fluid to inp... | 10/11/1994 |
| 5345764 | Control valve for bootstrap hydraulic systems The present invention is directed to a hydro-mechanical or electro-hydro-mechanical control system utilized for positioning a mechanical device. The control system incorporates an open-center control valve for selectively controlling the differential pres... | 09/13/1994 |
| 5323611 | Speed change controller of running hydraulic motor The present invention relates to an apparatus for controlling the running speed of a hydraulic motor. A hydraulic motor employable for a construction machine such as a power shovel or the like as a driving power source is constructed such that its rotatio... | 06/28/1994 |
| 5307630 | System pressure compensated variable displacement hydraulic motor Paper drive unit instability that includes a variable displacement hydraulic motor (34), a rotary output (48), and a displacement controlling wobbler (36, 40) in the case of an aiding load can be avoided through the use of a double acting hydraulic actuat... | 05/03/1994 |
| 5226290 | Bootstrap hydraulic systems The present invention is directed to a hydro-mechanical or electro-hydro-mechanical control system utilized for positioning a mechanical device. The control system incorporates a control valve for selectively controlling the flow of hydraulic fluid to inp... | 07/13/1993 |
| 5197283 | Hydraulic-motor drive circuit system with anti-cavitation control A hydraulic-motor drive circuit system includes an auxiliary hydraulic source connected to one end of an auxiliary line, a low-pressure selector connected to the other end of the auxiliary line and a pair of main lines for causing the other end of the aux... | 03/30/1993 |
| 5117634 | Apparatus for controlling the operation of hydraulic motors In an apparatus for controlling the operation of hydraulic motors having infinitely adjustable eccentricity, wherein a flow-control valve between a pump and a hydraulic motor supplied with pressure medium and a control valve for adjusting the eccentricity... | 06/02/1992 |
| 5083431 | Torque controlled variable displacement hydraulic motor In order to entirely eliminate pressure drop sensors in a variable displacement hydraulic motor (10), and to change the wobbler angle mechanically rather than hydraulically, the hydraulic motor (10) includes a motor housing (26) having a plurality of hydr... | 01/28/1992 |
| 5065577 | Hydromechanical displacement control for a power drive unit The problem of energy wastage in power drive units having fixed displacement hydraulic motors is avoided in a system having a variable displacement hydraulic motor (10) without the expense normally associated with such variable displacement systems by a c... | 11/19/1991 |
| 4907408 | Variable displacement hydraulic servomotor system A bidirectional hydraulic servomotor system includes a variable-displacement motor which may impel or brake movement of a load member that either resists or assits movement by the servomotor, respectively. The direction of load movement is under control o... | 03/13/1990 |
| 4845950 | Rotation angle dependent correction of speed control signal in low-speed constant torque control hydraulic drive Improved control of a hyrostatic drive machine at very small speeds of rotation. The rotation speed control signal in the creep rotation speed region is modified in dependence upon the actual value of the rotation angle and possibly the efficiency charact... | 07/11/1989 |
| 4823552 | Failsafe electrohydraulic control system for variable displacement pump An electrohydraulic system for control of a variable output pump includes a microprocessor-based controller receiving inputs from condition sensors coupled to the pump and command inputs from a remote master controller. The controller supplies outputs to ... | 04/25/1989 |
| 4768340 | Automatic displacement control for variable displacement motor A variable displacement motor control responsive to the pressure differential across the motor, with provisions for reverse motor operation and for aiding load conditions.... | 09/06/1988 |
| 4582141 | Motor vehicle with driving speed responsive to change in attachment load A motor vehicle, preferably with a fuel injection engine, has a coupling, such as a multi-point hitch, connectable to an attachment. One or more of the hitch's arms are pivotable about a connection to the vehicle, and when the attachment is pushed, pulled... | 04/15/1986 |
| 4579039 | Power drive unit A power drive unit for thrust reverser structure includes a reversible motor in a hydraulic circuit and has normal stow and deploy cycles of operation. In a deploy cycle, the load on the motor is aiding and, in the event the deploy cycle is inadvertent, t... | 04/01/1986 |
| 4554992 | Hydraulically operated four wheel sweeper A hydrostatically operated vehicle, such as a street sweeper, includes an engine driven reversible hydrostatic pump coupled to a single hydrostatic pump driving wheels of the vehicle. The pump is shiftable from neutral to reverse and forward, low and high... | 11/26/1985 |
| 4503674 | Hydrostatic drive systems A hydrostatic drive system is provided with an adjustable hydraulic motor operatively connected between a high pressure main line and a low pressure line and equipped with a control arrangement that influences the setting in an r.p.m.-dependent manner, th... | 03/12/1985 |
| 4495769 | Booster power steering A control valve for booster power steering has a back pressure check valve openable by pressure caused by wheel jolting, which check valve connects between a servopump pressure passage of the control valve through the inner bore of a valve sleeve operable... | 01/29/1985 |
| 4481769 | Control system for hydraulically driven vehicles A control system for a hydraulically driven vehicle having a variable displacement hydraulic motor connected with a variable displacement hydraulic pump in a closed loop and driven thereby. A spring-applied and fluid-released brake is mounted on an output shaf... | 11/13/1984 |
| 4474002 | Hydraulic drive pump apparatus A hydraulic drive apparatus for a wellhead pump jack which utilizes oppositely driven single-acting hydraulic cylinders as actuated by a variable volume pump having flow direction and flow volume controlled by a servo linkage and control lever. The linkag... | 10/02/1984 |
| 4459806 | Governing fuel injection and hydraulic transmission simultaneously A method of controlling an internal combustion engine (14) having a power control (15) and a variable hydrostatic transmission (16, 17) including a hydraulic pump (16) driven by the internal combustion engine, and a hydraulic engine (17) connected therewi... | 07/17/1984 |
