Abstract:
A swash plate angle for a hydrostatic power unit of a continuously variable hydromechanical transmission is determined using a feedforward compensation term, to reduce reliance on closed loop control. The feedforward term is based on knowledge of the hydrostatic power unit determined as a function of knowledge of certain parameters, including, but not limited to, hydrostatic power unit pressure, swash plate angle, desired hydrostatic power unit ratio, and pump speed.
Abstract:
An energy extraction device and method for extracting energy from a fluctuating energy flow from a renewable energy source. A hydraulic pump is driven by a rotating shaft, driven in turn by a renewable energy source. A hydraulic motor drives a load and a high pressure manifold communicates between the pump, motor and an elastically deformable fluid retaining body. The hydraulic pump and hydraulic motor comprise working chambers displacing a volume of working fluid selectable on each cycle of working chamber volume by the control of electronic valves. The pressure in the high pressure manifold is measured and the net rate of displacement of working fluid by the hydraulic pump is selected responsive thereto to regulate the torgue applied to the said rotating shaft. The net rate of displacement of working fluid by the hydraulic motor is selected to smooth the energy flow to the load. The net rate of displacement of working fluid by the hydraulic motor is selected to cause the pressure within the high pressure manifold to tend towards an optimum. The optimum is variable and can be selected to optimise the efficiency of power transmission from the rotating shaft to the load or to increase the longevity of the energy extraction device.
Abstract:
Offenbart ist ein Antrieb mit einer Hydropumpe, über die zumindest zwei Hydromotoren mit Druckmittel versorgbar sind. Der erfindungsgemässe Antrieb hat im Zulauf oder im Ablauf jedes Hydromotors einen veränderlichen hydraulischen Widerstand, der in eine Grundposition mit minimalem Öffnungsquerschnitt vorgespannt ist und über einen Steuerdruck in Richtung eines grösseren Öffnungsquerschnittes beaufschlagbar ist. Dieser Steuerdruck ist vom Druck im Zulauf oder im Ablauf des Hydromotors abhängig.
Abstract:
In a gearbox unit (1) for insertion between a drive motor (47) and a user (48), consisting of a hydrostatic drive (2) changeable by means of an adjusting device (15a, 15b), a final, particularly mechanical gearbox (4) with several ratios (5, 6) and a control device to change the hydrostatic drive (2) by means of the adjusting device (15a, 15b) for a gear-changing process, the gearbox (4), is a synchronised drive with synchronising devices (7) for the ratios (5, 6), a device (UP, V2) to measure or monitor the drive torque (M) of the hydrostatic drive (2) is allocated to the control device (16) and, when the drive torque (M) is greater than the working torque of the relevant synchronisation device (7, 7a) before a gear-changing operation, the control device (16) sets a drive torque (M) on the hydrostatic drive (2) by means of the adjusting device (15a, 15b) which is the same as or lower than the working torque of the synchronising device allocated to the gear ratio (6, 7) concerned.
Abstract:
A hydraulic system (23) includes a hydraulic transmission (24) including a hydraulic pump (26) configured to be coupled to a prime mover (12), a hydraulic motor (28) configured to be coupled to an output shaft (32), and fluid lines (46) coupling the hydraulic pump to the hydraulic motor to provide a fluid circuit (47) providing flow communication between the hydraulic pump and the hydraulic motor, such that operation of the hydraulic pump provides fluid flow to the hydraulic motor, and the hydraulic motor supplies torque to the output shaft. A controller (62) is configured to control operation of the hydraulic transmission. The controller is configured to receive signals indicative of pressure in the fluid circuit and reduce an output of the hydraulic pump when the pressure in the fluid circuit reaches a pressure level, and a rate of response of the reduction of the output of the hydraulic pump is varied based on a temperature of fluid in the fluid circuit.
Abstract:
It is intended to provide a power generating apparatus of renewable energy type which obtains desired torque rapidly in response to changes of the renewable energy as well as a method of operation such an apparatus. The power generating device which generates power from a renewable energy source, includes a rotating shaft 8 driven by the renewable energy, a hydraulic pump 12 of variable displacement type driven by the rotating shaft 8, a hydraulic motor 14 driven by pressurized oil supplied from the hydraulic pump 12, a generator 20 coupled to the hydraulic motor 14, a high pressure oil line 16 through which a discharge side of the hydraulic pump 12 is in fluid communication with an intake side of the hydraulic motor 14, a pump demand determination unit 44 which determines a displacement demand Dp of the hydraulic pump based on a target torque Td of the hydraulic pump 12 and an oil pressure in the high pressure oil line 16 and a pump controller 46 which adjusts displacement of the hydraulic pump 12 to the determined displacement demand Dp.