Abstract:
The fluid supply system comprises a multi-charge solid propellant gas generator and a fluid expulsion unit integrated into a single unit, the gas generator being provided in a cap (8) for a chamber (1) having a gas portion (3) and a fluid portion (2) and a movable partition (4) between these two portions operable to expel fluid from the chamber when the gas generator is rendered operative. The system also comprises ignition control means (22) operable to control the ignition of the solid propellant charges (13) when required to give a fully controllable system output. The system can be designed for supplying under pressure fluids such as hydraulic oil, fuels, oxidents and water and is particularly useful in aerospace applications.
Abstract:
Die Erfindung betrifft eine Druckspeicheranordnung (1) mit einem hydropneumatischen Druckspeicher (3) und einem weiteren hydropneumatischen Druckspeicher (5), wobei der eine Druckspeicher (3) mit einem hydraulischen Verbraucher (11) und der weitere Druckspeicher (5) mit einer Versorgungsquelle (15) auf den jeweiligen Fluidseiten (9, 17) verbindbar sind, wobei die beiden Druckspeicher (3, 5) auf ihren Gasseiten (19, 21) mittels einer Regulierungseinrichtung (25) miteinander gasleitend koppelbar sind, wobei der weitere Druckspeicher (5), eine Solldruckvorgabe für den hydraulischen Verbraucher (11) einhaltend, bei einer einen vorgebbaren Wert überschreitenden Solldruck-abweichung mittels einer Regulierungseinrichtung (25) an den einen Druckspeicher (3) zumindest solange gasleitend angeschlossen bleibt, bis die Solldruckabweichung den vorgebbaren Wert unterschreitet. Die Erfindung betrifft ferner eine Vorrichtung (7) mit einer solchen Druckspeicheranordnung (1).
Abstract:
A shovel includes a first pump 14L; a second pump 14R; a hydraulic swing motor 21; a pump/motor 14A configured to generate an engine-assist torque in response to hydraulic oil from the hydraulic swing motor 21 during swing deceleration; an accumulator 80 configured to accumulate the hydraulic oil flowing out of the hydraulic swing motor 21 during swing deceleration; a regeneration valve 22G configured to switch open/close of transfer from a discharge port 21L to the pump/motor 14A and the accumulator 80; and a controller configured to control the regeneration valve 22G. During swing deceleration, the controller adjusts an open area of the regeneration valve 22G in such a way that a swing flowing-out pressure becomes a swing braking target pressure, and causes the hydraulic oil flowing out of the hydraulic swing motor 21 to flow into the pump/motor 14A and the accumulator 80 at the same pressure.
Abstract:
A method includes detecting at least one position measurement of a separator piston of a pitch trim actuator. The method includes detecting at least one pressure measurement of a gas. The method includes detecting at least one temperature measurement of the gas. The method includes storing at least one position value based on the at least one position measurement of the separator piston, at least one pressure value based on the at least one pressure measurement of the gas and at least one temperature value based on the at least one temperature measurement of the gas. The method includes determining a volume of an oil within an oil chamber of the pitch trim actuator and a pressure of the gas within the gas chamber of the pitch trim actuator, based on the at least one position value, the at least one pressure value and the at least one temperature value.
Abstract:
The present disclosure relates to a hydraulic system for a construction machine, and more particularly, to a hydraulic system for a construction machine including a plurality of actuators, in which each of the actuators includes a pump/motor, is operated under a control of a corresponding pump/motor, and stores working oil in an accumulator or receives the working oil supplemented from the accumulator in accordance with a difference between a flow rate entering the actuator and a flow rate discharged from the actuator.
Abstract:
An online method for reconfiguring pressure and position sensors in a hydraulic system is disclosed. In one step, a sensor drift condition, a recalibration request, or an unisolated fault condition is detected. In another step, a system pressure sensor or another sensor, such as a load-sense pressure sensor, is verified as a trusted master reference sensor. Another step includes measuring and recording a first pressure reading at the master reference sensor and first voltage readings associated with first, second, third, and fourth pressure slave sensors at a first pump pressure set point. Another step includes, repeating the previous step at a second pump pressure set point. A new gain and offset for each of the first, second, third, and fourth pressure sensors can be calculated based on a comparison of the recoded first and second pressure readings and the recorded first and second voltage readings.
Abstract:
The invention relates to a hydraulic accumulator (1) comprising: a pressure vessel (2); a tube (7) for accepting a first medium (18), said tube (7) being arranged inside the pressure vessel (2); an interstice (32) for accepting a second medium (30), said interstice (32) being formed between the pressure vessel (2) and the tube (7); and at least one connection (17, 31) for delivering and discharging the first or second pressurized medium (18; 30) into and from the tube (7) or interstice (32), the delivery of one medium (18) causing the other medium (30) to be compressed.
Abstract:
The invention relates to a method for monitoring the gas prefill pressure in hydraulic accumulators (1). In said method, after the pressure supply to the oil side (5) of the accumulator has been interrupted and the contents of the tank (41) have been emptied, the current gas temperature and the current gas pressure are determined, once the temperature has equalised. The data relating thereto is telemetrically transmitted to an evaluation unit (51) which is spatially located at a distance, in order to calculate an actual value of the gas prefill pressure which corresponds to a reference temperature.