Abstract: A power split transmission includes a hydraulic power branch having two hydraulic machines arranged in a hydraulic circuit, at least one of which comprises an adjustable displacement. The transmission comprises a control device for controlling the transmission ratio, and is configured to actuate at least the one adjusting device at a displacement setting. The displacement setting is adjusted in relation to a displacement setting oriented to a current demand, at least in a drive mode or drive mode section in which the displacement of one of the hydraulic machines reaches a maximum or is reduced from this maximum.

Abstract: A vacuum prioritization system for a vehicle is disclosed. In one example, use and availability of vacuum provided via vacuum sources is allocated to higher priority vacuum operated actuators when a pressure in the vacuum system exceeds a threshold pressure. The lower priority vacuum operated actuators have access to vacuum supplied via the vacuum sources when pressure in the vacuum system is less than a threshold pressure. The approach may allow higher priority actuators to operate for an extended amount of time.

Abstract: A hydraulic control device that controls a hydraulic pressure for a plurality of friction engagement elements included in an automatic transmission mounted on a vehicle to establish a plurality of shift speeds, including: a plurality of pressure regulation valves, a plurality of hydraulic switches, speed change control means, and abnormality determination means.

Abstract: Inductive displacement sensor includes a coil and a target which is movable relative to the coil in a direction of movement, wherein an inductance of the coil is dependent on a position of the target relative to the coil, wherein the coil and the target at least partially overlap in the direction of movement.

Abstract: The present invention discloses a revolution vibration suppressing method for pump truck boom, comprising: detecting the vibration severity of the boom in the revolution direction; extracting dynamic characteristic parameters of the boom; calculating a control signal that can be used to control the revolving actuator to compensate the vibration severity according to the vibration severity and the dynamic characteristic parameters extracted; and driving the revolving actuator according to the control signal to move, to suppress the revolution vibration of the boom. In addition, the present invention further provides a revolution vibration suppression controller and a revolution vibration suppression device for a pump truck boom, and a pump truck comprising the device. With the technical scheme described above, the vibration of a pump truck boom in the revolution direction can be suppressed, and therefore the risk of failures of the boom is decreased and the operating safety in the work is improved.

Abstract: A hydraulic control system for a machine is disclosed. The hydraulic control system may have a work tool movable through segments of an excavation cycle, a motor configured to swing the work tool during the excavation cycle, at least one accumulator configured to selectively receive fluid discharged from the motor and to discharge fluid to the motor during the excavation cycle, and a controller. The controller may be configured to receive input regarding a current excavation cycle of the work tool, and make a determination based on the input that the current excavation cycle is associated with one of a set of known modes of operation. The controller may be further configured to cause the at least one accumulator to receive fluid and discharge fluid during different segments of the excavation cycle based on the determination.

Abstract: The invention relates to a wave power device 1 for the extraction of energy from waves in a liquid 3. The device 1 comprises a container 2 intended to at least partially be located in the liquid 3 from which the wave energy shall be extracted. The container 2 is provided with one or several openings 6, for admitting said liquid 3 and gas 5 into the container and at least one outlet 8. The container 2 is at least partly designed as an oblong unity adapted to be influenced by and essentially follow the wave motions in the liquid 3 so that the container 2 assumes a wave shaped contour. The container 2 will assume positions having different potential energy relative each other in at least a first portion 9 and a second portion 10. By the wave motion will liquid 3 and gas 5 be transported through the tubular container while a pressure is built up within the container 2.

Abstract: This disclosure provides improved nautical craft that can travel and navigate on their own. A hybrid vessel is described that converts wave motion to locomotive thrust by mechanical means, and also converts wave motion to electrical power for storage in a battery. The electrical power can then be tapped to provide locomotive power during periods where wave motion is inadequate and during deployment. The electrical power can also be tapped to even out the undulating thrust that is created when locomotion of the vessel is powered by wave motion alone.

Abstract: A method is used for synchronizing the speed of a hydraulic crane drive having at least one hydraulic consumer, which is fed with a variable volumetric rate of flow by way of at least one hydraulic variable displacement pump. The at least one hydraulic variable displacement pump is driven by way of a drive unit of the crane. By way of the crane control system, a swashplate angle of the at least one variable displacement pump is open and/or closed loop controlled as a function of the demanded volumetric flow rate for at least one consumer and/or on the basis of one additional parameter.

Abstract: A control system for a variable displacement hydraulic motor. A movable element is movable to adjust the operating displacement of hydraulic fluid through the motor. A positioning actuator moves the movable element between first and second positions to cause maximum and minimum operating displacement of the motor. A range limiting actuator positions a movable stop in a desired position, such that the movable stop interengages the movable element to cause motor displacement between the maximum and minimum operating displacements. The control system thus operates the motor in at least three modes: maximum operating displacement; minimum operating displacement; and an intermediate operating displacement.

Abstract: The present disclosure provides a hydraulic system of a transmission having a controller and a variable displacement pump. The pump includes an inlet and outlet and is adapted to be driven by a torque-generating mechanism. The system also includes a lube circuit fluidly coupled to the pump. A lube regulator valve is disposed in the lube circuit, such that the lube regulator valve is configured to move between at least a regulated position and an unregulated position. The regulated position corresponds to a regulated pressure in the lube circuit. A pressure switch is fluidly coupled to the lube regulator valve and configured to move between a first position and a second position, where the switch is disposed in electrical communication with the controller. A solenoid is disposed in electrical communication with the controller and is controllably coupled to the pump to alter the displacement of the pump.

Abstract: A hydraulic system has a cylinder and ram assembly that raises and lowers a load carrying carriage on a material handling vehicle. The fluid exhausting from the cylinder, while the carriage is lowering, is controlled to recover energy from that fluid. A first path routes the exhausting fluid to drive the pump as a hydraulic motor. A second path routes the exhausting fluid to a reservoir, bypassing the pump. In a first lowering mode, the second path is closed and the first path is opened. In a second lowering mode, both the first and second paths are open and the flow through each one is proportionally controlled. In a third lowering mode, only the second path is opened. The mode to use is selected based on the desired lowering speed of the carriage.

Abstract: A hydrostatic drive system for a machine is disclosed. The hydrostatic drive system includes a pump, a hydraulic motor configured to receive a pressurized fluid from the pump and a controller operably connected to the pump and the hydraulic motor. The controller is configured to receive an input signal indicative of a current machine speed and a desired machine speed. Further, the controller is configured to output a motor displacement command signal and a pump displacement command signal to adjust a displacement of the hydraulic motor and the pump respectively based on the input signal to maintain at least one of constant machine speed or constant acceleration or constant deceleration during adjustment of the pump displacement and the motor displacement.

Abstract: The present disclosure provides a hydraulic system of a transmission having a controller and a variable displacement pump. The pump includes an inlet and outlet and is adapted to be driven by a torque-generating mechanism. The system also includes a lube circuit fluidly coupled to the pump. A lube regulator valve is disposed in the lube circuit, such that the lube regulator valve is configured to move between at least a regulated position and an unregulated position. The regulated position corresponds to a regulated pressure in the lube circuit. A pressure switch is fluidly coupled to the lube regulator valve and configured to move between a first position and a second position, where the switch is disposed in electrical communication with the controller. A solenoid is disposed in electrical communication with the controller and is controllably coupled to the pump to alter the displacement of the pump.

Abstract: A modular compressed air energy storage system includes modular low pressure and high pressure subsystems coupled together with interstage pipes. Each of the subsystems includes a hydraulic vessel adapted to contain a heat transfer liquid and having a piston disposed therein for horizontal reciprocating movement. First and second pressure vessels are coupled to the hydraulic vessel on opposite sides of the piston, each adapted to contain the heat transfer liquid and/or a gas. First and second heat transfer devices are respectively disposed within upper regions of the pressure vessels. The piston is moveable in a first direction to displace at least some of the heat transfer liquid from the hydraulic vessel to the first pressure vessel and is moveable in a second direction to displace at least some of the heat transfer liquid from the hydraulic vessel to the second pressure vessel.

Abstract: A method and apparatus for conditioning water is disclosed. Water is flowed past a probe, wherein the water may include impurities. The probe is energized to excite the water and a presence of electrons in the excited water is reduced to produce positively charged water downstream of the probe that causes the impurities to dissociate from the water. The excited water may be deposited on a soil for crop production. The excited water may be further deposited on the soil to flush impurities in the soil to a depth away from a root of a crop planted in the soil to reclaim the soil for crop production. The excited water may further be used to descale pipes, such as used in irrigation, heat exchangers, cooling systems, etc. In yet another embodiment, the probe may be energized at a frequency selected to destroy organism, thereby protecting ecosystems.

Abstract: A servo actuator system and method of operating the same includes a dual acting actuator comprising an actuator body and a movable member movable in the actuator body to define a first and second chamber on each side of the movable member. A first port is fluidly coupled to the first chamber and a second port is fluidly coupled to the second chamber. A fluid pump having a return is provided. A proportional valve assembly is fluidly coupled to the fluid pump, return and the first and second ports. The proportional valve assembly includes a plurality of metering orifices. A controller is operably coupled to the proportional valve assembly to control the plurality of metering orifices to generate a load vector having magnitude and direction and wherein an actual position of a movable member in an actuator body is indeterminate.

Abstract: A hybrid or electric vehicle includes a hydraulic brake system having an active vacuum booster with an active boost control valve actuated by at least one controller. An isolation valve is disposed in a fluid circuit that fluidly connects a master cylinder to hydraulic brakes. A brake pedal is capable of moving in an initial deadband displacement range when initially depressed by an operator of the vehicle. While in the initial deadband displacement range, the controller selectively activates the isolation valve to inhibit fluid flow from at least a portion of the fluid circuit to the master cylinder based at least upon an operating state of the active boost control valve.

Abstract: A system is provided in which a control module may include a user interface configurable to receive input and display hydraulic control settings, wherein the hydraulic control settings include at least a hydraulic pressure setting and a hydraulic flow setting. The control module may also include a processor executable to convert the hydraulic control settings to corresponding electrical currents, wherein the electrical currents correspond to at least the hydraulic pressure setting and the hydraulic flow setting. The control module may also include one or more communication interfaces coupled to the processor configurable to output the electrical currents to the hydraulic circuit to control hydraulics that operate one or more attachments of a machine.

Abstract: The present disclosure provides a hydraulic system of a transmission having a controller and a variable displacement pump. The pump includes an inlet and outlet and is adapted to be driven by a torque-generating mechanism. The system also includes a lube circuit fluidly coupled to the pump. A lube regulator valve is disposed in the lube circuit, such that the lube regulator valve is configured to move between at least a regulated position and an unregulated position. The regulated position corresponds to a regulated pressure in the lube circuit. A pressure switch is fluidly coupled to the lube regulator valve and configured to move between a first position and a second position, where the switch is disposed in electrical communication with the controller. A solenoid is disposed in electrical communication with the controller and is controllably coupled to the pump to alter the displacement of the pump.

Abstract: An adaptive, low-impact vehicle energy harvester system, and a method of harvesting vehicle energy, is provided. The system includes a plurality of channels disposed longitudinally in a trafficway, wherein each of the plurality of channels includes one or more compressible, elongated hollow bodies such that a movement of a vehicle along the trafficway causes contents in the elongated hollow bodies to be expelled from one end, a motor in communication with the hollow bodies such that the contents expelled from one end of the hollow bodies actuate the motor, and a control unit that varies a resistance to the movement of the contents in the elongated hollow bodies based on at least one of a mass of the vehicle, a velocity of the vehicle, and a rate of change of velocity of the vehicle.

Abstract: The present invention relates to an engine that runs on natural air pressure, more particularly to a method and apparatus for operating a vehicle engine on natural air pressure in order to alleviate problem of pollution. The present invention provide a reliable method and apparatus for operating an engine with a natural air with appropriate pressure which is effective to deliver a constantly increasing amount of natural air to an engine as the speed of the engine increases which is readily adaptable to a standard internal combustion engine to convert the internal combustion engine for operation with a natural air.

Abstract: Systems, methods and devices for optimizing heat transfer within a device or system used to compress and/or expand a gas, such as air, are described herein. In some embodiments, a compressed air device and/or system can include an actuator such as a hydraulic actuator that can be used to compress a gas within a pressure vessel. An actuator can be actuated to move a liquid into a pressure vessel such that the liquid compresses gas within the pressure vessel. In such a compressor/expander device or system, during the compression and/or expansion process, heat can be transferred to the liquid used to compress the air. The compressor/expander device or system can include a liquid purge system that can be used to remove at least a portion of the liquid to which the heat energy has been transferred such that the liquid can be cooled and then recycled within the system.

Abstract: The invention relates to a method and to a working equipment for actuating a hydraulically movable working element (24), which is provided on a main body (14) of a working equipment (11), comprising at least one main cylinder (19) and at least one additional cylinder (28), which are supplied with pressure medium to generate a pivoting movement, wherein the pivoting movement in the rapid motion mode is actuated in a first working pressure range of the hydraulic control device (32), the pivoting movement in a working motion mode is actuated in a second working pressure range, which is higher than the first working pressure range, the pivoting movement in the heavy load motion mode is actuated in a third working pressure range, which is higher than the first and second working pressure ranges, and the pivoting movement of the working element (24) in the operating modes of rapid motion, working motion or heavy load motion is actuated in accordance with the prevailing working pressure.

Abstract: A hydraulic system is provided including a hydraulic actuator having a first chamber. A pump is configured to supply pressurized fluid to the hydraulic actuator. A balancing valve is configured to be operable in a balancing mode to equalize pressure in an accumulator and the first chamber of the hydraulic actuator. An activation valve is configured to be operable in a ride control mode to place the first chamber of the hydraulic actuator in communication with the accumulator. A flow control valve is configured to block flow from the pump when a flow rate from the pump exceeds a predetermined amount.

Abstract: An energy recovery system is disclosed for use with a hydraulic machine. The energy recovery system may have a tank, a pump configured to draw fluid from the tank and pressurize the fluid, an actuator, and an actuator control valve movable to direct pressurized fluid from the pump to the actuator and from the actuator to the tank to move the actuator. The energy recovery system may also have a motor mechanically connected to a rotary device and configured to selectively receive fluid discharged from the actuator, and at least one valve movable to selectively redirect fluid exiting the motor back to the actuator.

Abstract: The present invention in a preferred embodiment provides systems and methods for a velocity gradient floating turbine and power generation, comprising: a) a floating platform; b) guide vanes; c) a velocity gradient turbine; d) a gas compressor; e) a means to couple turbine and compressor, further comprising a turbine gear and a compressor gear or belt/chain drive; f) at least a pipe; and g) a turbine—generator sub-system; wherein the said floating platform comprises: i. at least two tanks; ii. at least a rod to support the said tanks; and wherein the said turbine—generator sub-system comprises: i. a turbine ; and ii. a generator.

Abstract: An energy-storing device with a charging circuit for a working gas for storing thermal energy, comprising a compressor, a heat accumulator, and an expansion turbine is provided. The compressor is connected to the inlet of the expansion turbine at the outlet side of the compressor via a first line for the working gas, and the heat accumulator is connected into the first line. The compressor and the expansion turbine are arranged on a common shaft, and the heat exchanger of the heat accumulator is designed such that the working gas which is expanded in the expansion turbine largely matches the thermodynamic state variables of the working gas prior to entering the compressor. Only a part of the thermal energy is transferred to the heat accumulator in the process. The working gas fed to the expansion turbine remains relatively hot.

Abstract: Apparatus and method for operating a subsea compression system. The subsea compression system comprising a separator, a compressor and a pump, wherein the compressor is operable for compression and discharge of gas that is separated from a well stream fed into the separator, and the pump is operable for pumping liquid that is separated from the well stream. The compressed gas is recycled from the compressor discharge side to the compressor intake side via a turbo-expander unit which is drivingly connected to the pump, the pump operable in response to circulation of compressed gas from the compressor discharge side to the compressor intake side.

Abstract: A compressed air energy storage system comprises a high-pressure water apparatus, a low-pressure water apparatus coupled to the high-pressure water apparatus through two channels, wherein a first channel is formed by a pumped hydroelectric power generation unit, a first high-pressure pipe and a first low-pressure pipe and a second channel is formed by a gas-water energy exchange unit, a second high-pressure pipe and a second low-pressure pipe and a compressed gas storage unit coupled to the gas-water energy exchange unit.

Abstract: The present invention relates to a generation system for converting compressed air in a passive main control room habitability system to energy when the main control room habitability system is activated during an accident scenario in a nuclear reactor power plant. The system includes a pressure regulator for reducing the pressure of the compressed air to produce reduced pressurized air, an eductor to deliver air to the control room, and piping to connect the tank to the pressure regulator and the eductor to allow the flow of compressed air therein. The generation system includes a mechanism positioned upstream of the eductor for receiving the reduced pressurized air from the pressure regulator and converting at least a portion of said reduced pressurized air into energy.

Abstract: Systems and methods for providing a soft robot is provided. In one system, a robotic device includes a flexible body having a fluid chamber, where a portion of the flexible body includes an elastically extensible material and a portion of the flexible body is strain limiting relative to the elastically extensible material. The robotic device can further include a pressurizing inlet in fluid communication with the fluid chamber, and a pressurizing device in fluid communication with the pressurizing inlet, the pressurizing device including a reaction chamber configured to accommodate a gas-producing chemical reaction for providing pressurized gas to the pressurizing inlet.

Abstract: A downhole control system for actuating hydraulically controlled devices positioned in a well. The system includes a first set of N hydraulically controlled devices positioned in the well and a second set of at least one hydraulically controlled device positioned in the well. A common control line is ported to a first side of each of the hydraulically controlled devices in the first set. N control lines are each ported to a second side of one of the hydraulically controlled devices in the first set. A first control line of the N control lines is ported to a first side of a first hydraulically controlled device of the second set and a second control line of the N control lines is ported to a second side of the first hydraulically controlled device of the second set, such that N+1 control lines are operable to actuate N+1 hydraulically controlled devices.

Abstract: A compressed air energy storage system integrated with a source of secondary heat, such as a simple cycle gas turbine, to increase power production and to provide power regulation through the use of stored compressed air heated by said secondary heat to provide power augmentation.

Abstract: A hydraulic control system includes a swing control valve between a pump and a swing motor to control flow to/from the swing motor, and a selector valve between an accumulator and the swing motor to regulate fluid flow. A controller is configured to receive inputs indicative of the pressure differential between the accumulator and conduit between the pump and swing motor, and a swing motor command, calculate a target swing motor flow based on the swing motor command input, and modulate operation of the swing control valve and the selector valve to regulate a swing speed.

Abstract: A control device and a control method of an electric booster include an assist function by an electrical actuator. An input piston of the electric booster moves along an axial direction within the booster piston in response to an operation of a brake pedal. During a brake operation, the control device controls an electric motor to integrally move the input piston and the booster piston while retaining a length of a gap between the input piston and the booster piston. In addition, when starting an internal-combustion engine, the control device performs a control of shortening the length of the gap to prepare for a decrease in power supply voltage of the electric motor. Therefore, a force in a return direction applied to the input piston from the booster piston in association with a power supply drop is suppressed, and causing a driver to feel a sense of discomfort is suppressed.

Abstract: A hydraulic system for a power shovel is disclosed. The hydraulic system may have a tank, a pump configured to draw fluid from the tank and pressurize the fluid, a crowd cylinder extendable and retractable to adjust a length of a dipper handle, and a valve in fluid communication with the tank, the pump, and the crowd cylinder. The valve may be movable to fill chambers of the crowd cylinder with fluid pressurized by the pump and to drain the chambers of the crowd cylinder to cause extension and retraction of the crowd cylinder. The hydraulic system may also have a dipper actuator located at an end of the crowd cylinder, and a passage extending through the crowd cylinder to communicate with the dipper actuator.

Abstract: Exemplary embodiments of the present invention disclose a method, computer program product, and system for energy production from fluid. In a step, the computer determines if the rate of the fluid level increase in the one of the one or more fluid reservoirs is above a predetermined threshold. In a step, the computer sends a signal to a bypass valve to open and release fluid through a bypass fluid connection from the one of the one or more fluid reservoirs if the rate of the fluid level increase in the one of the one or more fluid reservoirs is above a predetermined threshold. In a step, the computer sends a signal to a regulation valve to open for fluid connection to one or more turbines if the fluid level of the one of the one or more fluid reservoirs is above the predetermined threshold level.

Abstract: A hydraulic system that includes a controller controlling multiple hydraulic pumps to power multiple hydraulic functions. Any ratio of flow can be directed from each of the pumps to each of the functions, including having a pump dedicated to each function, or having one pump dedicated to one function and another pump supplying multiple functions including the one function. The controller can receive machine feedback and failure data indicating regions of the system with functional disruptions, and can direct flow from the pumps to the functions along routes that avoid the functional disruptions. The system can include operator input devices that provide operator inputs to the controller for controlling the system. The system can operate the hydraulic system in different modes, including modes to improve fuel efficiency and to improve productivity. The system can include a mode switch for operator selection of a desired mode.

Abstract: A staged rocket apparatus includes first and second stages connected by a releasable connector. A plurality of pressurized gas struts are connected between the first and second stages and provide a separating force urging the first and second stages apart. The gas struts are held in a telescopingly collapsed first position by the releasable connector. The separating force is maintained at a minimum value so long as the releasable connector holds the struts in their first position. When the releasable connector is disconnected the separating force increases due to gas flow through a metering passage having a progressively increasing flow area from a high pressure chamber to a low pressure chamber.

Abstract: A system and a method for operating a hydraulic driven work machine including a hydraulic travel motor having a variable displacement is provided, wherein a flow of hydraulic fluid generated by a hydraulic pump is provided to the travel motor and wherein a control valve is provided for controlling the flow of hydraulic fluid from the hydraulic pump to the travel motor. The hydraulic pump is provided with a hydraulic control depending on a load signal generated by the travel control valve and the travel motor is provided with an electric control according to a desired driving behaviour.

Abstract: Systems, methods and devices for optimizing bi-directional piston movement within a device or system used to compress and/or expand a gas, such as air, are described herein. In some embodiments, a compressed air device and/or system can include a first pneumatic cylinder, a second pneumatic cylinder, a hydraulic actuator, and a hydraulic controller. The first pneumatic cylinder has a first working piston disposed therein for reciprocating movement in the first pneumatic cylinder and the hydraulic actuator is coupled to the first working piston. The second pneumatic cylinder has a second working piston disposed therein for reciprocating movement in the second pneumatic cylinder. The hydraulic controller is fluidically coupleable to the hydraulic actuator and is operable in a compression mode and an expansion mode.

Abstract: An apparatus and method is provided for generating net energy by converting the natural pressure of atmospheric air into kinetic energy, which is then converted to mechanical energy by a turbine, which can then be converted to electric energy through a generator. The method relies on natural physical phenomena such as Entrainment, Inducement and the Venturi Effect to increase the mass and velocity of air flowing through an enclosed chamber without increasing the amount of energy consumed to increase the air flow mass and velocity. A turbine-generator apparatus connected to the chamber is driven by the air flow to generate electric power which is greater than the power consumed to generate the initial air flow. Power is generated through extraction of kinetic energy from natural atmospheric air pressure energy.

Abstract: A parallel cycle process of extracting energy from the rise and fall of the ocean tides utilizes a marine enclosure capable of supporting a differential head, equipment capable of using a differential fluid head to generate electricity and equipment capable of pumping against a differential head to generate power from the rise and fall of ocean tides in a manner that preserves and maintains sensitive intertidal zones.

Abstract: A shovel includes a plurality of hydraulic actuators including a first hydraulic actuator and a second hydraulic actuator, a main pump, a hydraulic pump-motor configured to function as a hydraulic motor by using hydraulic oil flowing out of the first hydraulic actuator and configured to function as a hydraulic pump, a control valve configured to control a flow of the hydraulic oil in the plurality of hydraulic actuators, a first oil passage to connect the main pump with the second hydraulic actuator through the control valve, and a second oil passage to connect the hydraulic pump-motor with the second hydraulic actuator. The second oil passage meets the first oil passage between the control valve and the second actuator.

Abstract: An electro-hydraulic steering system for an articulated machine includes an electrical circuit and a hydraulic circuit. The electrical circuit includes a controller, an electro-hydraulic valve assembly, and a spool position system. The hydraulic circuit includes a pump, at least one cylinder in selective fluid communication with the pump, and the valve assembly. The controller includes a computer-readable storage medium storing a steering system monitoring application which performs several steps. A desired flow of pressurized fluid to each cylinder and a desired spool position for the spool of the electro-hydraulic valve assembly, based upon the desired flow of pressurized fluid, are determined. The desired spool position and an actual spool position are compared to determine a spool-based flow error, which is summed over a period of time to determine a cumulative spool-based flow error. An event warning is issued when the cumulative spool-based flow error exceeds a threshold.

Abstract: A ramping subsystem of a control system for a dual path electronically controlled hydrostatic transmission is used to modify the commanded rate of change of pump and motor acceleration, deceleration and direction change command (performed to command machine motion from forward to reverse or vice versa) in order to achieve desired machine performance and operator feel. Pump and motor acceleration, deceleration and direction change command rates are then further modified using scaling tables based on selected maximum machine speed using operator input device.

Abstract: A control system for a machine with a dual path electronically controlled hydrostatic transmission is used to achieve a desired performance and a desired operator feel while performing all of the machine operations. The control system includes pump and motor displacement resolvers, command resolver, ramping blocks, pump and motor steering resolvers, engine load management and a straight tracking subsystem.

Abstract: There is provided a device and method for high speed hydraulic actuation. The method includes adjusting a position of an actuator using a hydraulic pressure regulator. Adjusting the position of the actuator includes increasing pressure on the hydraulic pressure regulator to open the actuator using a first solenoid, or decreasing pressure on the hydraulic pressure regulator to close the actuator using a second solenoid.

Abstract: A hydraulic control system for a machine is disclosed. The hydraulic control system includes a swing control valve coupled between the swing motor, the pump and the tank to selectively control a fluid flow between the pump and the swing motor. The hydraulic control system includes a first conduit coupled between a first port of the swing control valve and a first chamber port of the swing motor. Further, a second conduit is coupled between a second port of the swing control valve and a second chamber port of the swing motor. A first chamber valve and a second chamber valve coupled to the first conduit and the second conduit. A controller is configured to selectively move one of the first and second chamber valves to reduce the fluid flow between the swing motor and the tank such that the pressurized flow discharged from the swing motor is directed to an accumulator fluidly coupled to each of the first and second conduits.