An electronically commutated hydraulic machine is coupled to a drivetrain. Working chambers of the hydraulic machine are connected to low and high pressure manifold through electronically controlled valves. The phase of opening and closing of the valves has a default. In order to avoid cycle failure due to acceleration events, for example due to backlash in the drivetrain, the phase of opening or closing of the electronically controlled valves is temporarily advanced or retarded from the default timing.

An apparatus for conveying thick matter has a drive cylinder for receiving hydraulic fluid, a drive piston, which is arranged in the drive cylinder, a conveying cylinder for receiving thick matter, a conveying piston, which is arranged in the conveying cylinder, and a piston rod, which is fastened to the drive piston for coupling motion together with the conveying piston. The drive cylinder has a rod-side opening for applying pressure to a rod side of the drive piston by way of hydraulic fluid and a crown-side opening for applying pressure to a crown side of the drive piston facing away from the rod side by the hydraulic fluid. A drive pump is designed to generate a drive volume flow having a drive pressure of hydraulic fluid for moving the drive piston. A pump connection is designed for variable connection of the drive pump to the rod-side opening or the crown-side opening for the flow of hydraulic fluid. A sensor is designed for automatic detection of whether the pump connection is connected to the rod-side opening or the crown-side opening. A control unit controls the apparatus in a rod-side operating mode, when the rod-side pump connection is detected, and in a crown-side operating mode, when the crown-side pump connection is detected.

An electronically commutated hydraulic machine is coupled to a drivetrain. Working chambers of the hydraulic machine are connected to low and high pressure manifold through electronically controlled valves. The phase of opening and closing of the valves has a default. In order to avoid cycle failure due to acceleration events, for example due to backlash in the drivetrain, the phase of opening or closing of the electronically controlled valves is temporarily advanced or retarded from the default timing.

An apparatus for conveying thick matter has a drive cylinder for receiving hydraulic fluid, a drive piston, which is arranged in the drive cylinder, a conveying cylinder for receiving thick matter, a conveying piston, which is arranged in the conveying cylinder, and a piston rod, which is fastened to the drive piston for coupling motion together with the conveying piston. The drive cylinder has a rod-side opening for applying pressure to a rod side of the drive piston by way of hydraulic fluid and a crown-side opening for applying pressure to a crown side of the drive piston facing away from the rod side by the hydraulic fluid. A drive pump is designed to generate a drive volume flow having a drive pressure of hydraulic fluid for moving the drive piston. A pump connection is designed for variable connection of the drive pump to the rod-side opening or the crown-side opening for the flow of hydraulic fluid. A sensor is designed for automatic detection of whether the pump connection is connected to the rod-side opening or the crown-side opening. A control unit controls the apparatus in a rod-side operating mode, when the rod-side pump connection is detected, and in a crown-side operating mode, when the crown-side pump connection is detected.

A drive assembly and system include a drive, controllable to exhibit a selected one of a plurality of drive modes that include driving the drive in one of a first driving direction and a second driving direction, the second driving direction being directed opposite relative to the first driving direction, a pump that is drivable by the drive and configured to produce a hydraulic flow to flow in a flow direction independent of the first or second driving direction of the selected drive mode, and a control valve that is configured to be set in a valve position associated with the selected drive mode and configured to thereby direct the hydraulic flow produced by the pump depending on the selected drive mode of the drive along a selected one or more of a plurality of flow paths that are arranged downstream of the pump.

A control device for controlling a displacement pump or motor, comprising a variable mechanical device, comprising at least two masks, wherein the at least two masks are phased relative to each other and a shaft, and are configured to create a desired cam profile. A cam follower is operatively connected to at least one of an intake valve an output valve of a displacement pump or motor.

A micro pump is formed on a substrate having a common inlet channel and a common outlet channel by a plurality of pumping elements, each pumping element having an inlet coupled to the common inlet channel and an outlet coupled to the common outlet channel, the inlet and outlet connected by a microfluidic channel, the microfluidic channel comprising a valvular conduit having low fluid flow resistance in a direction from the inlet to the outlet and high fluid flow resistance in a direction from the outlet to the inlet, and an actuating element arranged to cause fluid to be pumped through the microfluidic channel from the inlet to the outlet, wherein the actuating element is based on one or more of piezoelectric, thermal, electrostatic or electromagnetic transduction. A controller is coupled to actuate the actuating elements at mutually staggered relative timing so as to produce a substantially continuous steady flow.

A hydraulic pump assembly including a first pump, a second pump, a shaft, and fluid lines is disclosed. The first pump includes a first piston assembly. The second pump including a second piston assembly. Each piston assembly of the first and second pumps includes a cylinder and a piston slidably disposed in the cylinder. The shaft connects the first pump to the second pump and is configured to displace the pistons within the cylinders of the first and second piston assemblies. The fluid lines fluidly couple the first piston assembly with the second piston assembly to form paired piston assemblies. The first piston assembly is phase shifted from the second piston assembly.

An apparatus for use as an output device of a user interface to an information processing system includes at least one device for generating a synthetic jet. The device is capable of producing outputs with different modalities. Examples of different modalities that are possible include airflows, vibration and sound.

A drive assembly and system include a drive, controllable to exhibit a selected one of a plurality of drive modes that include driving the drive in one of a first driving direction and a second driving direction, the second driving direction being directed opposite relative to the first driving direction, a pump that is drivable by the drive and configured to produce a hydraulic flow to flow in a flow direction independent of the first or second driving direction of the selected drive mode, and a control valve that is configured to be set in a valve position associated with the selected drive mode and configured to thereby direct the hydraulic flow produced by the pump depending on the selected drive mode of the drive along a selected one or more of a plurality of flow paths that are arranged downstream of the pump.