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| Number | Title | Issue Date |
| 8136355 | Pump control apparatus for hydraulic work machine, pump control method and construction machine A pump control apparatus for a hydraulic work machine includes: a rotation speed setting device that sets a target rotation speed for an engine; a rotation speed control device that controls an engine rotation speed so as to adjust the engine rotation speed to the t... | 03/20/2012 |
| 8042331 | On-demand hydraulic pump for a transmission and method of operation A fixed displacement binary pump is provided for a powertrain on a vehicle. A hydraulic system is operatively connected with first and second discharge ports of the pump and is operable to alternately permit fluid flow through both discharge ports (i.e., full displa... | 10/25/2011 |
| 7546729 | Method and system for limiting torque load associated with an implement A method for reducing a torque load associated with an implement includes determining a speed associated with a power source, wherein the power source is configured to provide power to a hydraulic pump, determining a position associated with an implement system, and... | 06/16/2009 |
| 7513110 | Control apparatus of construction machine and method for calculating input torque A control apparatus of a construction machine includes a hydraulic pump driven by a prime mover, a hydraulic actuator, and a rotation speed detection device for detecting an actual rotation speed of the prime mover. The control apparatus includes a prime mover contr... | 04/07/2009 |
| 7416045 | Dual hydraulic machine transmission The modular transmission uses only a pair of small and light hydraulic machines of remarkably improved volumetric efficiency with pistons having body portions substantially as long as the axial length of the respective cylinders in which they reciprocate. The two hy... | 08/26/2008 |
| 7398648 | Travel control device for hydraulically driven vehicle and hydraulically driven vehicle The present invention includes a hydraulic pump 10 driven by a prime mover 1, a traveling motor 12 driven with pressure oil delivered from the hydraulic pump 10, a control valve 11 for traveling that controls a flow rate of the pre... | 07/15/2008 |
| 7386978 | Method for controlling a hydraulic system of a mobile working machine A method is described for controlling a hydraulic system, particularly of mobile working machine, with at least one internal combustion engine driving at least one hydraulic pump with adjustable volumetric displacement and possibly additional fixed-displacement pump... | 06/17/2008 |
| 7370475 | Traveling hydraulic working machine A modification torque ΔT and a torque converter speed ratio e is computed from input and output revolution speeds of a torque converter 31. A first determination coefficient α corresponding to the speed ratio e, and a second determination coefficient β cor... | 05/13/2008 |
| 7365925 | Method of aligning optical elements A method of aligning an optomechanical assembly and an optomechanical assembly are described. ... | 04/29/2008 |
| 7353651 | De-stroking dual hydrostatic pump A zero turning radius mower has a dual hydrostatic pump with right and left pump arms. A linkage between the pump arms and a pair of control levers destrokes both sides of the pump simultaneously if engine speed drops below a specified value. The linkage allows each... | 04/08/2008 |
| 7316113 | Control device for a work machine hydraulic pump used in a work vehicle A control device for a work machine hydraulic pump used on a work vehicle according to the present invention has an object to rapidly accelerate the engine to start the vehicle quickly and to rapidly produce a large tractive force when an operator starts depressing ... | 01/08/2008 |
| 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 |
| 7281373 | Fluid pump control device for wheel loaders A fluid pump control device for wheel loaders includes an engine for driving an axle through a transmission, a main pump, a variable-displacement steering pump with a pump regulator, an auxiliary pump, an electronic proportional control valve provided on a discharge... | 10/16/2007 |
| 7269945 | Method for compensating flow rate at neutral position of operation lever of construction equipment A method for compensating a flow rate at a neutral position of an operation lever of construction equipment is adapted so that when RPM of an engine becomes different, an actuator can be identically driven according to an operating amount of the operation lever. The... | 09/18/2007 |
| 7149639 | Method of detecting nozzle clogging and analytical instrument A method of detecting nozzle clogging by the use of threshold values that can be set easily is accomplished. Also, an analytical instrument equipped with a nozzle clogging detector using threshold values that can be set easily is accomplished. Threshold values corre... | 12/12/2006 |
| 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 |
| 7032379 | Oil supply unit for a running power transmission There is provided an oil supply unit for a running power transmission of a vehicle. The oil supply unit includes a housing, a hydraulic pump of a variable displacement type, a detecting mechanism and a control mechanism. The detecting mechanism is constructed to mon... | 04/25/2006 |
| 6986368 | Hydraulic control system for tree cutting saw A hydraulic circuit for a tree-cutting machine having a feed mechanism powered by hydraulic fluid at the output of a hydraulic motor. The hydraulic motor may comprise a variable-displacement motor. The hydraulic circuit may comprise elements which provide an anti-st... | 01/17/2006 |
| 6915631 | Forward/backward switching control apparatus for hydraulic drive vehicle, and control method therefor A forward/backward switching control apparatus for a hydraulic drive vehicle that includes the following structures. A variable displacement type hydraulic pump driven by an engine for discharging pressure oil in both directions. An electromagnetic pump inclination ... | 07/12/2005 |
| 6852064 | Hydromechanical transmission electronic control system for high speed vehicles An electronic transmission control system that can achieve a transmission ratio based on the operator inputs and the current vehicle operating conditions. The transmission constantly connects the engine to the load, and the transmission ratio is only varied by a cha... | 02/08/2005 |
| 6823672 | Control device for construction machine To provide a control system, which can realize a saving in energy and an improvement in the efficiency of work, for a construction machine having an engine, hydraulic pumps, pump regulators, a fuel injection system, hydraulic actuators, control valves including plur... | 11/30/2004 |
| 6688102 | Traveling control device The present invention discloses a traveling control device, including a crawler type right and left traveling body; a right and a left hydraulic motor for operating the right and left traveling body said right and left hydraulic motors each having a pump ... | 02/10/2004 |
| 6684636 | Electro-hydraulic pump control system A method is provided for controlling displacement of a variable displacement pump coupled to a load. The method includes determining an electrical signal to be applied to a proportional solenoid for a desired pump displacement based on known pump characte... | 02/03/2004 |
| 6675577 | Anti-stall transmission control for utility vehicle A control system for a utility vehicle, particularly a compact utility tractor, that is speed-controlled by a hydrostatic transmission, prevents engine stalling by automatically reducing the stroke of a pump of the hydrostatic transmission, and thus reduc... | 01/13/2004 |
| 6672055 | Hydraulic pump control device Disclosed herein is a hydraulic-pump controller that is capable of controlling absorbed pump torque in good balance against engine output at all times. In this hydraulic-pump controller, the discharge flow rates of the operating oil that are discharged fr... | 01/06/2004 |
| 6655135 | Construction machine In a construction machine according to the present invention wherein there is made an engine speed sensing control to control a pump horsepower in accordance with an engine speed of an engine, there is performed, in a low temperature condition with hydrau... | 12/02/2003 |
| 6385970 | Underspeed control system for a hydromechanical drive system and method of operating same An apparatus for controlling load on an engine is disclosed. The apparatus includes a continuously variable transmission driven by the engine. The apparatus further includes an engine speed sensor being adapted to sense the output speed of the engine and ... | 05/14/2002 |
| 6321535 | Hydraulic circuit for working vehicle A hydraulic circuit for a loader vehicle includes a working machine hydraulic circuit, a steering hydraulic circuit, a variable displacement auxiliary hydraulic pump, in which the displacement volume becomes smaller as the operating oil pressure becomes h... | 11/27/2001 |
| 6269635 | Control and hydraulic system for a liftcrane A control system for a liftcrane that utilizes a closed loop hydraulic system that utilizes feed back and feed forward control architecture to provide responsiveness normally associated with systems that do not require feedback.... | 08/07/2001 |
| 6145308 | Air turbine with power controller having operation independent of temperature A fluid driven turbine for use in generating power by driving a load (32) with a fluid stream intercepting blades (12) of the turbine and the turbine applying power to the load during rotation of the blades in accordance with the invention includes a vari... | 11/14/2000 |
| 6105367 | Hydraulic drive system A hydraulic drive system wherein differential pressures across flow control valves are controlled by pressure compensating valves to become the same value, i.e., a differential pressure ƊPLS, and the differential pressure ƊPLS is maintained at a target ... | 08/22/2000 |
| 6080074 | Process for precise adjustment of a hydrostatic and mechanical torque division gearing A hydrostatic/mechanical multiple path power transmission comprises an adjustable hydrostat unit (4), a summing planetary gearbox (10) with two input shafts (6, 8) and at least two output shafts, and a step gearbox (11) connected to the output shafts. In ... | 06/27/2000 |
| 6073442 | Apparatus and method for controlling a variable displacement pump A method for controlling the displacement of a variable displacement hydraulic pump to produce a desired flow of fluid is disclosed. The method includes the steps of: determining that the machine is being operated in a digging cycle; determining a desired... | 06/13/2000 |
| 6058703 | Fluid valve transmission A fluid valve transmission having an automatic by-pass in neutral on the pump side and automatic brake or by-pass on the driven motor side while in the neutral position. Through holes and channels in the rotor are designed with close openings to open and ... | 05/09/2000 |
| 6014996 | Control system for stump cutters An apparatus to maintain optimum engine speed and cutter wheel speed to maintain peak power output of the engine and peak flywheel effect of the stump cutter wheel and method for maintaining optimum engine speed. The stump cutter has a rotating cutting wh... | 01/18/2000 |
| 6010309 | Control device for variable capacity pump A controller, for a variable capacity pump, prevents engine stalls due to rapid changes in operating load by increasing the pump absorption torque when the engine speed is high so as to increase the work amount and by reducing the pump absorption torque w... | 01/04/2000 |
| 5996343 | Overspeed control system for a hydro-mechanical drive system In one aspect of the present invention, an apparatus for controlling the negative load of an engine is disclosed. The engine is drivingly connected to a hydro-mechanical drive system that includes a variable displacement pump and motor. An engine speed se... | 12/07/1999 |
| 5944492 | Hydraulic pump control system A hydraulic pump control system is shown that can control the absorbing torque of a hydraulic pump with respect to the engine power for driving the hydraulic pump in a well-balanced manner, and reduce a deviation of an actual revolution number from a targ... | 08/31/1999 |
| 5904050 | Motor vehicle air conditioning control system An air conditioning control system with a hermetic compressor for a motor vehicle is disclosed. The control system comprises a system for controlling the speed of the hermetic compressor (34) in such a way that the compressor driven by a variable-displace... | 05/18/1999 |
| 5884479 | Device for matching the operation of travelling unit in construction vehicles A device for matching the operation of a travelling unit in a construction vehicle is disclosed. The device reduces the required levering force of a travelling control pedal, easily controls the rotating force of an engine, and safely changes the engine o... | 03/23/1999 |
