Abstract:
A hybrid compressor selectively driven by an engine and an electric motor. The hybrid compressor includes a variable displacement compression mechanism. When the compression mechanism is driven by the motor, the cooling capacity of a refrigeration circuit that includes the hybrid compressor is adjusted by controlling the inclination of the swash plate and the motor speed. In the control procedure, the inclination angle of the swash plate and the motor speed are controlled so that the compression mechanism and the motor are most efficiently operated to achieve the required cooling capacity. Therefore, the hybrid compressor is constantly operated with maximum efficiency.
Abstract:
A control device is herein disclosed which comprises a drive piston 12p for changing the position of a slanting plate in a variable capacity pump 11, an electromagnetic proportional valve 13 for driving the drive piston, and a position detector 14 for detecting a position of the slanting plate. The control device performs a flow rate control of operating oil by controlling the electromagnetic proportional valve in accordance with a difference between a flow rate instruction value Fr for the operating oil and a position detection value from the position detector so as to change the position of the slanting plate. The control device further includes a pressure detector 18 for detecting a pressure of the operating oil supplied to an injection cylinder 10, and correcting means for correcting the flow rate instruction value on the basis of a pressure detection value from the pressure detector to output a corrected flow rate instruction value.
Abstract:
A load sensing control system for a hydraulic machine sets a variable target differential pressure between a delivery pump pressure and a load pressure of an actuator. A control factor is determined that becomes larger as the deviation between the target differential pressure and the actual differential pressure is increased, and that becomes smaller as the differential pressure deviation is decreased. The control factor also becomes larger as the target differential pressure becomes smaller. The target displacement volume for the hydraulic pump is based on the differential pressure deviation, which is calculated from the target differential pressure and the control factor.
Abstract:
An electric hydraulic hybrid motor which can be made smaller in size and provide good performance. To this end, a hydraulic pump (20) and a hydraulic motor (60) are disposed inwardly, respectively, of a stator (12) of an electric motor (10) and a rotor (14), and the hydraulic pump (20) comprises a cylinder block (21) for a pump which is adapted to rotate together with the rotor (14) and a plunger (23) for the pump, and the hydraulic motor (60) comprises a cylinder block (61) for the motor and a plunger (23a) for the motor.
Abstract:
A displacement detection device for a variable displacement compressor in which a swash plate which is connected to a piston through shoes in a housing slides relative to the shoes and rotates synchronously with a drive shaft with a wobbling motion in an axial direction of the drive shaft as the drive shaft is rotated, and an inclination angle of the swash plate is controlled thereby changing a stroke of the piston, includes a detection object provided in a first portion of an outer periphery of the swash plate where an imaginary plane passing through a point of intersection between a line connecting top and bottom dead center positions of the swash plate and an axial line of the drive shaft in perpendicular relation to the line intersects with the outer periphery of the swash plate and a detector provided in the housing so as to face the detection object.