Abstract:
A fluid system comprises a pressure vessel with a baffle oriented at a skew angle. The baffle divides the vessel into first and second volumes. A first port is provided to introduce a pressurizing fluid into the first volume, and a second port is provided to circulate a working fluid within the second volume. A purge aperture is provided to purge the pressurizing fluid from the second volume across the baffle into the first volume, and a flow aperture is provided to transfer the working fluid through the baffle between the first and second volumes.
Abstract:
The invention relates to a method of condition-monitoring hydraulic accumulators. The gas content of the accumulators is monitored by the gas volume being calculated on the basis of the weight and working pressure of the accumulators. The working pressure of the accumulators and a relevant operational history are recorded with an electronic logging system which stores data for use in connection with condition-based maintenance of the accumulators.
Abstract:
The invention relates to a hydraulic fluid accumulator (30) having a high-pressure chamber (32) and a low-pressure chamber (33), wherein the high-pressure chamber (32) provided with an equalizing volume (36) is disposed in the low-pressure chamber (33). Provided at the hydraulic fluid accumulator (30) is an external connection (34) for the equalizing volume (36), by means of which connection the equalizing volume (36) can be filled with a gas having a predefinable pressure.
Abstract:
An active accumulator system which automatically adjusts or adapts the charge pressure or volume of an accumulator to maintain an optimal charge pressure or volume of the accumulator may provide optimal operation of a pump. An active accumulator system may comprise a flow line coupled to a pump, wherein a fluid flows through the flow line to the pump, an accumulator coupled to the flow line, a transducer coupled to the pump, wherein the transducer detects a parameter of the pump at an inlet of the pump, and a controller coupled to the transducer and the accumulator, wherein the controller receives the parameter, and wherein the controller regulates air flow to the accumulator such that the accumulator is adjusted to an optimal charge pressure based at least in part on the parameter.
Abstract:
A hydraulic accumulator assembly in which a hydraulic accumulator is associated with at least one responsive unit, which is responsive to the weight of the accumulator to provide an indication dependent on the weight of the accumulator. The accumulator is in an underwater fluid extraction well facility.
Abstract:
A hydraulic drive system for driving a load includes a drive shaft; first and second hydraulic pumps driven by the drive shaft, and a control system that operates the hydraulic drive system in a plurality of modes including: a) a first mode where the second hydraulic pump pumps hydraulic fluid from a supply line to an accumulator; b) a second mode where the second hydraulic pump pumps hydraulic fluid from the accumulator to the supply line; c) a third mode where the second hydraulic pump pumps hydraulic fluid from the supply line to a reservoir; and d) a fourth mode where the second hydraulic pump pumps hydraulic fluid from the reservoir to the supply line. At least the second hydraulic pump is a variable displacement bidirectional pump.
Abstract:
A hydraulic accumulator assembly in which a hydraulic accumulator is associated with at least one responsive unit, which is responsive to the weight of the accumulator to provide an indication dependent on the weight of the accumulator. The accumulator is in an underwater fluid extraction well facility.
Abstract:
Sensor device (1) for detecting flowable media (3, 3′), and pressure device (5) and measuring method for operating the sensor device (1). A sensor device (1) for detecting flowable media (3, 3′), in particular in the form of fluids (9) which can be received in pressure devices (5), such as pressure containers (7) or pressure lines, with at least one sensor element (11) is characterized in that the respective sensor element (11) has an oscillation device (13) which is excited to produce oscillations under the action of a field (15) of a field generation device (17), the oscillating behaviour of which oscillations changes upon inflow of the respective medium (3), and in that the change can be detected by a measuring device (19).
Abstract:
A system includes a pump, accumulator, a sensor which measures line pressure in a fluid circuit, and a controller. The controller plots and calculates respective slopes of first and second sets of measured pressure values from the sensor, calculates a slope ratio, and compares the slope ratio to a threshold. The controller also records the pre-charge pressure as the point of intersection of lines representing the slopes when the ratio exceeds the threshold. A control action is executed when the pre-charge pressure drops below a calibrated minimum threshold. A method includes measuring the pressure values, calculating the respective slopes and the slope ratio, comparing the slope ratio to a ratio threshold, recording the point of intersection of lines representing the slopes as an interpolated pre-charge pressure value when the ratio exceeds the threshold, and executing the control action.
Abstract:
A hydraulic system for an automatic transmission, in particular a dual-clutch transmission, of a motor vehicle. A high-pressure circuit, in which a pressure accumulator, at least one clutch, and gear selectors are connected, and a low-pressure circuit for cooling the clutch. The high-pressure circuit and the low-pressure circuit have at least one hydraulic pump, which can be driven by an electric motor. The hydraulic system also has a control unit, which activates the electric motor of the hydraulic pump when a requirement to charge the pressure accumulator is identified. The high-pressure and low-pressure circuits are connected via a bypass line to an integrated accumulator charging valve, which in a non-charging position fluidically connects the hydraulic pump to the low-pressure circuit and in a charging position fluidically connects the hydraulic pump to the high-pressure circuit.