摘要:
A hydraulic transmission comprising a variable displacement pump and motor, at least one of which has cylinders having valves which are controllable on each cycle of cylinder working volume to determine the net displacement of working fluid by the cylinder. The transmission has a controller which determines a displacement of the pump and the motor. The displacement of the pump and/or motor is controlled to avoid the pump and/or motor generating vibrations with frequencies which correspond to resonant frequencies of portions of a machine which are part of or in mechanical communication with the hydraulic transmission and which arise from the pattern of active and inactive cycles of cylinder working volume, taking into account the speed of rotation of the rotatable shaft of the pump and/or motor.
摘要:
A method for selecting the displacement of working fluid by cylinders of a variable displacement hydraulic pump or motor in a hydraulic transmission. A displacement determination algorithm executed repetitively to select the net displacement by each cylinder for each cycle of cylinder working volume, selects the displacement so that the time averaged total displacement is matched to the time averaged displacement demand. In some embodiments some of the cylinders have the same phase as each other. The displacement determination algorithm can be repetitively executed to determine the net displacement by the cylinders with the same phase or the number N of cylinders with the same phase which are to undergo an active cycle can first be selected and then N cylinders can be selected to undergo the active cycles.
摘要:
A hydraulic machine is provided with: a valve configured to switch a state of communication between a hydraulic chamber formed by a cylinder and a piston and an outside of the hydraulic chamber by moving the movable unit; anda controller for controlling an open/close operation of the valve; and a signal detector for detecting a signal which the solenoid coil generates when the movable unit moves from a first position to a second position. The controller is configured to, in a case where the signal is not detected when a phase angle indicating a position of the piston in a first range including a target phase angle for moving the movable unit to the second position: execute a control mode for controlling an actuator to a non-driving state; and determine an operation state of the valve based on whether or not the signal is detected when the control mode is executed and the phase angle of the piston is in a second range which is at least in part a range excluding the first range.
摘要:
It is intended to provide a diagnostic system and a diagnostic method for a hydraulic machine as well as a hydraulic transmission and a wind turbine generator, whereby abnormality of the hydraulic machine can be accurately diagnosed. A diagnostic system is for a hydraulic motor (10) having a rotation shaft (32), a cylinder (20), a piston (22) forming a working chamber (24) with the cylinder (20), a high-pressure valve (28) and a low-pressure valve (30) provided for the working chamber, and a converting mechanism (25). The diagnostic system is provided with a pressure sensor (72) for detecting a pressure of the working chamber (24) and an abnormality determination part for determining abnormality of the hydraulic motor (10) based on detection result of the pressure sensor (72).
摘要:
A method is for diagnosing a hydraulic machine including a rotation shaft, a high-pressure line, a low-pressure line, cylinders, pistons guided by the respective cylinders, a cam configured to reciprocate the pistons in conjunction with rotation of the rotation shaft, high-pressure valves provided for respective working chambers formed by the cylinders and the pistons, for switching a communication state between the high-pressure line and the respective working chambers, and low-pressure valves provided for the respective working chambers, for switching a communication state between the low-pressure line and the respective working chambers. The method includes a step of detecting a failure of the hydraulic machine, the failure including at least one of sticking of the high-pressure valves in an open state, sticking of the low-pressure valves in a closed state, or sticking of the pistons, on the basis of at least one of a standard deviation of a torque of the rotation shaft in a no-load state of the hydraulic machine, or a fluctuation component of a specific frequency from among a torque fluctuation of the rotation shaft, a pressure fluctuation in the high-pressure line, and an output fluctuation of the hydraulic machine, the specific frequency being determined by a rotation speed ω of the rotation shaft and a cam-lobe number m of the cam.
摘要:
An object of the present invention is to provide a hydraulic transmission, a power generating apparatus of a renewable energy type, and an operation method thereof which are capable of preventing the pressure increase of the pressurized oil in the high pressure oil line caused by rapid increase of the energy inputted into the rotation shaft while the hydraulic motor receives high load. A hydraulic transmission comprises: a hydraulic pump of a variable displacement type configured to be driven by a mechanical energy inputted into a rotation shaft; a hydraulic motor of a variable displacement type configured to be driven by a pressurized oil from the hydraulic pump; a high pressure oil line for introducing the pressurized oil from the hydraulic pump to the hydraulic motor; and a controller for controlling a displacement of each of the hydraulic pump and the hydraulic motor, wherein, the controller is configured to: when at least one of the displacement of the hydraulic motor or a pressure of the pressurized oil is less than a first threshold value, control the displacement of the hydraulic motor so as to adjust the pressure of the pressurized oil in the high pressure oil line to a target pressure value; and when at least one of the displacement of the hydraulic motor or the pressure of the pressurized oil is not less than the first threshold value, reduce the displacement of the hydraulic pump so as to prevent the pressure of the pressurized oil from increasing suddenly responsive to a rapid increase of the mechanical energy inputted into the rotation shaft.
摘要:
A hydraulic transmission comprising a variable displacement pump and motor, at least one of which has cylinders having valves which are controllable on each cycle of cylinder working volume to determine the net displacement of working fluid by the cylinder. The transmission has a controller which determines a displacement of the pump and the motor. The displacement of the pump and/or motor is controlled to attenuate oscillations in parameters such as the pump torque or the pressure in the high pressure working fluid line connecting the pump to the motor. A demand signal, such as a torque demand signal is processed taking into account a damping signal which is calculated to compensate for variations in the amplitude and phase of the response of the net displacement by said cylinders to the received demand signal with the frequency of the one or more oscillations and the speed of rotation of the rotatable shaft of the pump or motor respectively.
摘要:
An object of the present invention is to provide a hydraulic transmission, a power generating apparatus of a renewable energy type, and an operation method thereof which are capable of preventing the pressure increase of the pressurized oil in the high pressure oil line caused by rapid increase of the energy inputted into the rotation shaft while the hydraulic motor receives high load. A hydraulic transmission comprises: a hydraulic pump of a variable displacement type configured to be driven by a mechanical energy inputted into a rotation shaft; a hydraulic motor of a variable displacement type configured to be driven by a pressurized oil from the hydraulic pump; a high pressure oil line for introducing the pressurized oil from the hydraulic pump to the hydraulic motor; and a controller for controlling a displacement of each of the hydraulic pump and the hydraulic motor, wherein, the controller is configured to: when at least one of the displacement of the hydraulic motor or a pressure of the pressurized oil is less than a first threshold value, control the displacement of the hydraulic motor so as to adjust the pressure of the pressurized oil in the high pressure oil line to a target pressure value; and when at least one of the displacement of the hydraulic motor or the pressure of the pressurized oil is not less than the first threshold value, reduce the displacement of the hydraulic pump so as to prevent the pressure of the pressurized oil from increasing suddenly responsive to a rapid increase of the mechanical energy inputted into the rotation shaft.
摘要:
A hydraulic transmission comprising a variable displacement pump and motor, at least one of which has cylinders having valves which are controllable on each cycle of cylinder working volume to determine the net displacement of working fluid by the cylinder. The transmission has a controller which determines a displacement of the pump and the motor. The displacement of the pump and/or motor is controlled to avoid the pump and/or motor generating vibrations with frequencies which correspond to resonant frequencies of portions of a machine which are part of or in mechanical communication with the hydraulic transmission and which arise from the pattern of active and inactive cycles of cylinder working volume, taking into account the speed of rotation of the rotatable shaft of the pump and/or motor.