| Class / Patent application number | Description | Number of patent applications / Date published |
|---|
| 060431000 | Condition responsive control of or by input to input pump drive means | 39 |
| 20080271444 | RETURN TO NEUTRAL MECHANISM FOR HYDRAULIC PUMP - A return to neutral mechanism includes a hub, a lever and a biasing member. The hub is configured to connect fast to a control rod of an associated hydraulic pump. The lever connects to the hub and includes a location configured to connect to an associated linkage that is connected to an associated steering mechanism. The biasing member connects to the lever for biasing the lever and the control rod toward a neutral position. | 11-06-2008 |
| 20090090102 | METHOD OF REDUCING THE LOAD OF ONE OR MORE ENGINES IN A LARGE HYDRAULIC EXCAVATOR - A method of reducing the load of at least one engine arranged in an hydraulic excavator during a speed overload situation of a respective engine, includes reducing a delivery quantity of at least one hydraulic secondary consumer until the respective engine has been returned to a desired operational speed range. | 04-09-2009 |
| 20090145121 | Hydraulic Drive Device for Dump Truck - [OBJECT] To provide a hydraulic drive system for a dump truck, which can prevent an excessive increase in engine rotation speed upon operation of a truck body. | 06-11-2009 |
| 20090193802 | CONTROL METHOD FOR HYDRAULIC TYPE CONTINUOUSLY VARIABLE TRANSMISSION - A control method for a hydraulic type continuously variable transmission for suppressing a harmful effect due to the reacceleration just after deceleration of a vehicle. In a hydraulic type continuously variable transmission, the operation of a shifting actuator is stopped to suspend the shift control (S | 08-06-2009 |
| 20090282823 | POWER ASSIST HYDRAULIC STEERING SYSTEM WITH ON DEMAND PUMP - A power assisted hydraulic steering system comprises a helm pump hydraulically connected to a first hydraulic actuator. A power assist pump is hydraulically connected to a second hydraulic actuator. The first and second hydraulic actuators are coupled. A flow sensing mechanism is disposed along a hydraulic conduit which hydraulically connects the helm pump to the first hydraulic actuator. The flow sensing mechanism senses when fluid flows from the helm pump to the first hydraulic actuator. A motor actuates the power assist pump when the flow sensing mechanism senses that fluid is flowing from the helm to the first hydraulic actuator. In one embodiment the first hydraulic actuator is a servo cylinder and the second hydraulic steering actuator is a drive cylinder. | 11-19-2009 |
| 20090320461 | CONTROL DEVICE OF ENGINE, CONTROL DEVICE OF ENGINE AND HYDRAULIC PUMP, AND CONTROL DEVICE OF ENGINE, HYDRAULIC PUMP, AND GENERATOR MOTOR - An object of the present invention is to operate the working machine etc. with satisfactory responsiveness as intended by the operator while enhancing engine efficiency, pump efficiency, and the like, where a first engine target revolution ncom | 12-31-2009 |
| 20090320462 | HYDRAULIC DRIVE APPARATUS AND HYDRAULICALLY-DRIVEN VEHICLE - The object of the present invention is to allow an operator to easily perform desired operations with high hydraulic efficiency, without an increase in difficulty of performing operations. A hydraulic drive apparatus of the present invention includes a pump control unit | 12-31-2009 |
| 20100058752 | ROTATION CONTROL SYSTEM FOR WORKING-MACHINE PUMP - A rotation control system of a hoist pump includes: the hoist pump ( | 03-11-2010 |
| 20100064677 | WORK MACHINE - A work machine includes: hydraulic actuators | 03-18-2010 |
| 20100083650 | HYDRAULIC CIRCUIT FOR OPERATING A TOOL - A hydraulic circuit for operating a tool is provided that is particularly useful in construction equipment such as an excavator, crane, wheel loader, drilling machine, or others. Furthermore, a control unit and a method for controlling the hydraulic circuit and construction equipment including such a hydraulic circuit is disclosed. | 04-08-2010 |
| 20100126162 | VELOCITY-PRESSURE CONTROL APPARATUS OF HYDRAULIC MACHINE - A velocity-pressure control apparatus of a hydraulic machine includes a pressure command generator, a pressure sensor, a pressure controller, a velocity command generator, a velocity limiter, a switch, a comparator, a velocity sensor, and a motor driver. The pressure controller receives a pressure compensation signal composed by the pressure command generator and the pressure sensor. The velocity limiter receives a compensation velocity signal from the pressure controller and a predetermined velocity signal from the velocity command generator and outputs a corresponding limiting velocity command signal to the switch. The comparator controls the velocity-pressure control apparatus to work at a velocity control mode when the pressure compensation signal is a positive signal or a null signal, and controls the velocity-pressure control apparatus to work at a master pressure control and slave velocity control mode when the pressure compensation signal is a negative signal. | 05-27-2010 |
| 20100199655 | HYDRAULIC PUMP CONTROL SYSTEM - A hydraulic load ramping system, in certain aspects, may utilize load sensing feedback from an engine, thereby reducing the possibility of overloading the engine as well as smoothing the transition between hydraulic load levels. In particular, by ramping between hydraulic load levels, unwanted movement of hydraulically-driven equipment may be minimized. In addition, by efficiently monitoring the load sensing feedback and ramping between hydraulic load levels, the hydraulic output may be maximized. | 08-12-2010 |
| 20100293937 | HYDRAULIC DRIVE WITH AN INDEPENDENT CHARGE PUMP - The invention relates to a hydraulic drive ( | 11-25-2010 |
| 20110126533 | METHOD FOR CLOSED-LOOP POWER CONTROL OF A ROAD FINISHING MACHINE OR FEEDER AND A ROAD FINISHING MACHINE OR FEEDER COMPRISING THE SAME - In the hydrostatic working operation of a road finishing machine or a feeder which comprises a primary power plant with an internal combustion engine (M) and several hydraulic variable displacement pumps, which are hydraulically connected to hydraulic motors of working components, and which possesses a computerized control device, the internal combustion engine is operated within its engine-specific characteristic map in response to the load condition by dynamic speed adaptation in a characteristic zone with optimal consumption, and the displacements (V | 06-02-2011 |
| 20110192156 | Hydraulic Drive Device for Construction Machine - A hydraulic drive device for a construction machine which can reliably judge whether or not the state of the construction machine is appropriate for stopping an engine is provided. The hydraulic drive device includes: a main pump | 08-11-2011 |
| 20110289911 | HYDRAULIC SYSTEM AND METHOD OF ACTIVELY DAMPING OSCILLATIONS DURING OPERATION THEREOF - A hydraulic system and a method of actively damping oscillations during actuation of a hydraulic cylinder in a hydraulic system is disclosed. The hydraulic cylinder is actuated by energizing a motor that rotatably drives a pump. The pump supplies a fluid to the hydraulic cylinder to actuate the cylinder. A pressure of the fluid is sensed during actuation of the hydraulic cylinder. A rotational speed of the motor is varied in response to the sensed pressure of the fluid. This varying of the rotational speed of the motor actively damps pressure oscillations during actuation of the hydraulic cylinder. | 12-01-2011 |
| 20120023923 | HYDRAULIC TOOL THAT COMMANDS PRIME MOVER OUTPUT - The present disclosure provides embodiments directed towards a system for the control of hydraulic output by a hydraulic power source. In one embodiment, a system is provided. The system includes a hydraulic supply system having a drive, a hydraulic pump coupled to the drive, a first hydraulic output configured to supply a first flow of a hydraulic fluid from the hydraulic pump to a hydraulic lift, a second hydraulic output configured to supply a second flow of the hydraulic fluid from the hydraulic pump to a first hydraulic tool, and a controller configured to adjust a speed of the drive in response to a feedback indicative of a first load by the hydraulic lift, a second load by the first hydraulic tool, or a combination thereof. | 02-02-2012 |
| 20120117959 | Remote Control Circuit for a Hydraulically Operated Device - A flow circuit enables an ROV to control a submersible machine having three motors without electronics, and using only two fluid flow lines between the machine and the ROV. The circuit configures two of the motors to operate in parallel, and a switch valve between the parallel motors and the third motor. A detection circuit on the machine detects the presence or absence of a back pressure in the controlling lines. If a back pressure is detected, the circuit on the machine directs fluid to either of the motors in parallel, or the third motor, thereby enabling the operator to select which motor or motors to operate by creating or releasing a back pressure. | 05-17-2012 |
| 20120124987 | SELF-CONTAINED MODULAR ACTUATOR - Pneumatic actuator apparatuses with expandable chambers, and methods of using same. In some embodiments, the apparatuses are self-contained and/or self-inflating. | 05-24-2012 |
| 20120304635 | Engine Control Device - A first target engine speed is set in response to a command value commanded by a command unit. A second target engine speed equal to or lower than the first target engine speed is set based on the first target engine speed. When the first target engine speed is reduced, the second target engine speed is set to be constant or be decreased and a reduction range for decreasing the first target engine speed to the second target engine speed is set to be decreased. The reduction range is set at zero when the first target engine speed is equal to or lower than an engine speed at least at a maximum torque point. | 12-06-2012 |
| 20130152574 | Working Vehicle Travel Control Apparatus - A working vehicle travel control apparatus, comprising: a variable displacement hydraulic pump; a variable displacement hydraulic motor connected in a closed circuit to the hydraulic pump and driven upon pressure oil from the hydraulic pump; a first control unit controls a motor displacement angle of the hydraulic motor by an electrical signal; a constant mesh transmission includes a clutch device that includes a High clutch section transmits power at a first transmission gear ratio and a Low clutch section that transmits power at a second transmission gear ratio, which is greater than the first transmission gear ratio, the constant mesh transmission transmits or interrupts power from the hydraulic motor; and a second control unit controls the first control unit so as to reduce the motor displacement angle to a predetermined value when the transmission is switched from the first transmission gear ratio to the second transmission gear ratio. | 06-20-2013 |
| 20130160441 | QUICK COUPLER CIRCUIT FOR CONSTRUCTION EQUIPMENT | 06-27-2013 |
| 20130174539 | Engine Control System for Construction Machine - Disclosed is an engine control system for a construction machine having an engine and a control device for controlling, via a directional control valve, a flow of pressure oil to be fed to a hydraulic actuator. The system is provided with a controller, which includes a manipulation state determination unit for the control device and an idle stop control unit for performing idle stop control when the control device is determined to have remained unmanipulated. The system also includes a temperature sensing device for a fluid relevant to the operation of the engine. The controller includes a unit for determining whether or not the temperature of the fluid is not higher than a predetermined temperature. When the temperature of the fluid is determined to be not higher than the predetermined temperature, the controller disables the idle stop control. | 07-11-2013 |
| 20140000252 | POWER SOURCE APPARATUS AND HYBRID CONSTRUCTION MACHINE EQUIPPED WITH SAME | 01-02-2014 |
| 20140007565 | SLEWING TYPE WORKING MACHINE - A slewing-type working machine, including a base, an upper slewing body, a hydraulic motor slewing the upper slewing body, a hydraulic pump, a slewing operation device, a control valve controlling the hydraulic motor, pipe-lines connecting the hydraulic motor to the control valve, a hydraulic pressure source, communication valves switching communication and cutoff between the pipe-lines and a tank by pilot pressure, an electric motor, an electric storage device, communication selector valves on inlet sides of the communication valves, a switching control valve on an inlet side of the communication selector valves, and a controller. During slewing deceleration, the controller signals to switch the switching control valve to a connecting position and switch the communication selector valves to a pilot pressure supply position. In a slewing stopped state, the controller signals to switch the communication selector valves to a cutoff position and switch the communication valves to a communication cutoff position. | 01-09-2014 |
| 20140020374 | HYDRAULIC CONTROLLER OF DRIVING FORCE DISTRIBUTION DEVICE - In a hydraulic controller of driving force distribution device, including: a hydraulic circuit composed of an oil pump for supplying hydraulic fluid to a piston chamber of a clutch (or a driving force distribution device), an opening and closing valve installed in an oil passage between a check valve and the piston chamber, and an accumulator communicating to the piston chamber; control is performed so that the piston chamber reaches a target hydraulic pressure based on the 1st characteristic by closing the opening and closing valve and driving the oil pump at the time of pressurizing the piston chamber; and control is performed so that the piston chamber reaches a target hydraulic pressure based on the 2nd characteristic by prohibiting the driving of the oil pump along with opening the opening and closing valve. | 01-23-2014 |
| 20140020375 | HYDRAULIC WORKING MACHINE - A hydraulic working machine has an assist electric motor connected to an engine and a hydraulic pump. The emissions of air pollutants in the exhaust gas from the engine are minimized regardless of fluctuations in the load torque of the hydraulic pump. A specific revolution speed suitable for reducing the emissions of air pollutants is stored, and an engine is controlled using the specific revolution speed as a target revolution speed. The absorption torque of a hydraulic pump is subjected to high-pass filtering whereby a high-frequency component devoid of a trend component is obtained. Target assist torque is computed from the high-frequency component, and the assist electric motor is subjected to power running/generation control accordingly. A specific output torque range suitable for reducing the emissions of air pollutants is stored, and the target assist torque is corrected so that the trend component does not exceed the specific output torque range. | 01-23-2014 |
| 20140130486 | HYDRAULIC DRIVE APPARATUS FOR WORK MACHINE - Provided is a hydraulic drive apparatus for working machine capable of preventing an excessive pressure drop on a meter-in side and moving a load in a lowering direction at a stable speed requiring no counter balance valve, including a hydraulic pump, a first hydraulic actuator lowering a first load, an operating device, a first hydraulic circuit including meter-in and meter-out flow passages, a control valve, a meter-in-flow-rate controller, a meter-out-flow-rate controller making a meter-out flow rate not lower than a meter-in flow rate, a second hydraulic actuator, a second hydraulic circuit between the first hydraulic circuit and a tank and for the second hydraulic actuator, a back pressure valve between the second hydraulic circuit and the tank, a regeneration line leading a part of hydraulic fluid from between the second hydraulic circuit and the back pressure valve to the meter-in flow passage, and a check valve in the regeneration line. | 05-15-2014 |
| 20140130487 | HYDRAULIC DRIVE SYSTEM - A hydraulic driving system includes a hydraulic pump, a driving source, a hydraulic cylinder, a closed circuit hydraulic path between the pump and cylinder, a pump-flow-rate control unit controlling a discharge flow rate of the pump, a flow rate control valve between the pump and the cylinder in the fluid path, a directional control unit, a target flow rate setting unit and a control device. The directional control unit allows a flow of fluid from the pump to the cylinder and prohibits a flow of fluid from the cylinder to the pump when fluid is supplied from the pump to the cylinder via the flow rate control valve. The control device controls fluid flow to the cylinder with the flow rate control valve when the target flow rate is within a prescribed range, and with the pump-flow-rate control unit when the target flow rate is greater than the prescribed range. | 05-15-2014 |
| 20140190156 | PASSIVE AND ACTIVE SUSPENSION WITH OPTIMIZATION OF ENERGY USAGE - A hydraulic actuator includes a shock absorber and a control system that is separate from the shock absorber and which generates damping loads for the hydraulic actuator. The control system generates the damping load by using a pair of variable valves, a pair of check valves, an accumulator, a pump/motor and a flow controller. The forces are generated in all four quadrants of compression/rebound and active/passive. A device which recuperates the energy generated by the hydraulic actuator can be incorporated into the hydraulic actuator to generate energy in the form of electrical energy. | 07-10-2014 |
| 20140260233 | Hydraulic actuator with on-demand energy flow - Various embodiments related to hydraulic actuators and active suspension systems as well as their methods of use are described. | 09-18-2014 |
| 20140298791 | Flywheel module - A flywheel module comprises a coupling unit which has an input shaft and an output shaft. This coupling unit has a first coupling of which a first coupling half can be connected to a combustion engine and a second coupling half can be connected to a continuously variable transmission. The flywheel module further comprises a flywheel unit which has an in/output and is formed by a flywheel and a reduction gear unit connected to the flywheel. This flywheel unit is exclusively connected to the in/output via the coupling unit. | 10-09-2014 |
| 20140331662 | HYDRAULIC CONTROL DEVICE FOR FORKLIFT - A hydraulic control device for a forklift includes a hydraulic pump, a single electric motor for driving the hydraulic pump, an outflow control mechanism provided between a lift cylinder and the hydraulic pump, a flow control valve provided between the outflow control mechanism and a draining portion, and a controller. When a lowering operation of a fork and either forward or rearward mast tilting operations of a mast are performed at the same time, the controller controls the electric motor based on a target speed of the hydraulic pump. The flow control valve controls the flow rate of hydraulic fluid from the lift cylinder to the hydraulic pump and the flow rate from the lift cylinder to the draining portion in accordance with the difference between the actual rotation speed of the hydraulic pump and the target rotation speed of the hydraulic pump. | 11-13-2014 |
| 20140352291 | HYDRAULIC TORQUE CONVERTER WITH AUTOMATIC REGULATOR OF DYNAMIC LIQUID TEMPERATURE - The hydraulic torque converter with a temperature automatic regulator of dynamic liquid includes hydraulic torque converter and radiator. A temperature control valve is also included to reflect the temperature of the dynamic liquid. The hydraulic torque converter is provided with dynamic liquid outlet tube and dynamic liquid inlet tube. The dynamic liquid inlet tube and dynamic liquid outlet tube are connected with radiator. The temperature control valve is mounted at the end of dynamic liquid inlet tube and dynamic liquid outlet tube near the hydraulic torque converter. | 12-04-2014 |
| 20150107237 | HYDRAULIC ENGINE INCLUDING HYDRAULIC POWER UNIT - Provided is a hydraulic engine that generates power using oil pressure, the hydraulic engine including: a hydraulic power unit including a hydraulic tube comprising a hollow portion having an opened front end and being filled with a fluid, an amplitude amplification device that is disposed at the rear side of the hydraulic tube, an oscillator that is disposed at the rear side of the amplitude amplification device so as to be deformed and increases and decreases a pressure within the hydraulic tube, and an oscillator head that is attached to a front end of the oscillator. | 04-23-2015 |
| 20160061228 | Valve Arrangement for the Hydraulic Circuit of a Work Machine - Valve arrangement includes a pilot operated load control valve fluidly having an energized unidirectional state allowing hydraulic fluid to pass from an outlet to an inlet and a de-energized unidirectional state allowing hydraulic fluid to pass from the inlet to the outlet. A pilot conduit is configured to direct pilot hydraulic fluid to actuate the load control valve. A connecting conduit fluidly connects the pilot conduit to the inlet, the connecting conduit including a flow restriction and a check valve configured to allow hydraulic fluid to flow only in a direction from the pilot conduit towards the inlet. | 03-03-2016 |
| 20160069282 | ENGINE SPEED CONTROLLER OF WORK MACHINE - The present invention is to reduce the flow rate of pressure oil discharged from a main pump and returned to a tank when specific work is executed with an operation amount of an operating device being made small in the state in which an engine is kept at an idling speed. According to the present invention, there is provided a main controller ( | 03-10-2016 |
| 20160146226 | FELLING SAW RECOVERY CONTROL - A hydraulic system for a felling saw head includes a hydraulic motor, operatively coupled to a saw disc of the saw head, a hydraulic variable displacement pump, operatively coupled to the hydraulic motor to supply pressurized fluid to the motor, and a controller configured to control the pump. To provide a target operating speed of the saw disc, the motor is configured to operate at a first displacement corresponding to a first flow rate of hydraulic fluid through the motor During at least a part of a saw recovery operation, the controller controls the pump to operate at a current pump displacement that results in a flow rate of hydraulic fluid through the pump that exceeds the first flow rate through the motor. Saw recovery time may be reduced without overspeeding the saw by including a metered flow control device between the pump and the motor. | 05-26-2016 |
| 060432000 | Pump drive means deactivated responsive to position of output stroke device | 1 |
| 20120090310 | KINEMATIC CONTROL IN A HYDRAULIC SYSTEM - A hydraulic system is provided, having a pump, operably connected to a motor. It also comprises a controller-driven hydraulic actuator, operably connected to the pump and a hydraulic valve, operable to direct hydraulic fluid to and from either a rod side or a cylinder side of the hydraulic actuator. Rod and cylinder side pressures are pre-defined based on the instantaneous acceleration or deceleration required. Decelerating the hydraulic actuator could involve maintaining the current pressure in the meter-out side of the hydraulic actuator and decreasing the current pressure in the meter-in side by varying the speed of the pump. Deceleration of the hydraulic actuator could also include decreasing pressure on the meter-in side of the hydraulic actuator at a higher rate than on the meter-out side. Acceleration is achieved using a similar approach. | 04-19-2012 |
