Abstract: A hydraulic control system for a machine is disclosed. The hydraulic control system may have a first fluid actuator, a first pump configured to produce a first stream of pressurized fluid, a second fluid actuator, and a second pump configured to produce a second stream of pressurized fluid. The hydraulic control system may further have a combiner valve, and a controller. The controller may be configured to receive an operator input indicative of a desired velocity for the first fluid actuator, determine a flow rate for the first fluid actuator corresponding to the desired velocity, and determine a flow capacity of the first pump. The controller may also be configured to move the combiner valve to combine the second stream of pressurized fluid with the first stream of pressurized fluid when the determined flow rate for the first fluid actuator is greater than the determined flow capacity of the first pump.

Abstract: A hydraulic control system for a work machine is disclosed. The hydraulic control system has a fluid actuator, a supply of pressurized fluid, and a control valve movable to selectively pass pressurized fluid to the fluid actuator. The hydraulic control system also has a sensor configured to sense the pressure of the pressurized fluid passed to the fluid actuator and a controller in communication with the control valve and the sensor. The controller is configured to receive an input indicative of a desired velocity of the fluid actuator and to determine a fluid flow rate corresponding to the desired velocity. The controller is also configured to determine a ratio of the sensed pressure to a stall pressure of the supply and to scale down the determined flow rate an amount based on the determined ratio. The controller is further configured to move the control valve an amount corresponding to the scaled down flow rate.

Abstract: The present disclosure is directed to a hydraulic system. The system includes a first source of pressurized fluid and at least one fluid actuator. The system also includes a first valve disposed between the first source and the at least one fluid actuator being configured to selectively communicate pressurized fluid from the first source to a source of low pressure. The system further includes a controller configured to determine a first amount of displacement of the first valve, determine a second amount of displacement of the first valve, and modify the first amount of displacement as a function of the second amount of displacement when a first pressure is less than or equal to a pressure of pressurized fluid acting on the at least one fluid actuator.

Abstract: A hydraulic system is disclosed having a source of pressurized fluid, at least a one hydraulic actuator, and a first valve. The first valve has a first valve element movable relative to a first valve bore between a plurality of positions from a first position in which pressurized fluid is substantially blocked from flowing toward the at least one hydraulic actuator to a second position in which pressurized fluid is allowed to flow toward the at least one hydraulic actuator. The first valve element is configured to be selectively moved from a third position located between the first and second positions to a fourth position located between the third and second positions at least partially based on a pressure signal of pressurized fluid downstream of the first valve.

Abstract: A hydraulic control system for a work machine is disclosed. The hydraulic control system has a first pump, a second pump, an operator control device, and a controller. The first and second pumps are configured to pressurize a fluid. The operator control device is movable through a range of motion from a neutral position to a maximum position to generate a corresponding control signal. The controller is in communication with the first pump, the second pump, and the operator control device. The controller is configured to receive the control signal, affect operation of the first pump in response to the control signal as the operator control device is moved throughout the range of motion, and affect operation of the second pump in response to the control signal only as the operator control device is moved through a portion of the range of motion.

Abstract: The present disclosure is directed to a hydraulic system having a first source of pressurized fluid and at least one fluid actuator. The hydraulic system further includes a first valve disposed between the first source and the at least one fluid actuator. The first valve is configured to selectively communicate pressurized fluid from the first source to a tank in response to a first command. The first command is at least partially based on a predetermined flow area of the first valve.

Abstract: The present disclosure is directed to a valve system including a controller and a valve including a valve element and a valve bore. The valve element is selectively movable relative to the valve bore at least partially in response to a signal communicated from a controller. The communicated signal is at least partially based on a load on the actuator and a determined pressured drop. The determined pressure drop is at least partially based on a hysteretic filter.

Abstract: A hydraulic control system for a work machine is disclosed. The hydraulic control system has a fluid actuator with first and second chambers, first and second metering valves having valve elements movable to fill and drain the first and second chambers respectively, and at least one fluid sensor configured to generate a load signal indicative of a load on the fluid actuator. The hydraulic control system also has an operator interface device movable to generate a desired velocity signal of the fluid actuator. The hydraulic control system further has a controller in communication with the first and second metering valves, the at least one fluid sensor, and the operator interface device.

Abstract: A hydraulic control system for a work machine is disclosed. The hydraulic control system has first and second fluid actuators, first and second pumps, a combiner valve, and a controller. The first pump is configured to produce a first stream of pressurized fluid directed to the first fluid actuator. The second pump is configured to produce a second stream of pressurized fluid directed to the second fluid actuator. The combiner valve is movable toward a combining position at which the second stream of pressurized fluid is combined with the first stream of pressurized. The controller is configured to determine a flow rate for the first fluid actuator corresponding to a desired velocity, determine a flow capacity of the first pump, and move the combiner valve toward the combining position when the determined flow rate for the first fluid actuator is greater than the determined flow capacity of the first pump.

Abstract: A hydraulic system has a source, a plurality of fluid actuators, and a controller. The controller is configured to receive an input indicative of which of the plurality of fluid actuators are a first and a second type of fluid actuator, to receive an input indicative of a desired flow rate for the plurality of fluid actuators, and to determine a current flow rate of the source. The controller is further configured to demand the desired flow rate for the first type of fluid actuator and to demand a scaled down desired flow rate for the second type of fluid actuator when a total desired flow rate exceeds the current flow rate of the source, and to demand a scaled down desired flow rate for all of the plurality of fluid actuators when the desired flow rate for the first type of fluid actuator exceeds the current flow rate of the source.