JP2007530865A5 - - Google Patents

Claims (9)

  A fluid working machine comprising variable volume working chambers, each of said variable volume working chambers being connected to a fluid commutator means that alternately connects the working chamber to one of two fluid manifolds; Fluid actuated machine in which a controlled valve member is inserted in the flow path between each said chamber and said commutator means.   The controller that controls the valve member receives an input signal of the phase angle of the shaft of the fluid-operated machine or at least one electrical pulse per rotation that informs the controller that the shaft has passed a known phase angle. The fluid working machine according to claim 1.   Preferably, the controller is configured to select whether to activate the valve member each time the volume of the working chamber approaches its minimum value, and to isolate the working chamber from the commutator means. 3. The fluid actuated machine of claim 2, wherein the valve member is adapted to close when the actuating chamber approaches when it begins its expansion stroke.   The controller generates a total displacement volume demand and compares it to the actual displacement volume by the fluid working machine in the same time interval and aggregates the preceding flow demand to determine displacement error, the controller comprising: 4. Fluid actuation according to claim 3, wherein one of the choice of either isolating the actuation chamber or leaving the actuation chamber activated to minimize the accumulated displacement error in progress. machine.   The controller uses a demand from an external signal line to adjust one of the displaced volume per speed, torque, volume flow rate, power, and rotation when the working chamber reaches a minimum volume condition. The fluid working machine of claim 3, wherein the fluid working machine is read to determine whether to isolate the working chamber.   In order to maintain a constant level of process flow or a process flow that increases more slowly than indicated by an increase in shaft speed when the fluid working machine is accelerated, the controller has a ratio of working cylinder to idle cylinder that is a predetermined function. The fluid working machine according to claim 3, wherein it is determined to isolate the working chamber based on the sensed shaft speed to decrease according to   3. A fluid working machine according to claim 2 configured to operate as a motor, wherein the chamber is connected to the commutator means for only a small portion of the expansion stroke and in the expansion stroke. The controller controls the valve member with a small portion of the path into the expansion stroke of the chamber so that the volume of fluid actuation to drive the load is a small portion of the total geometric displacement volume of the chamber. A fluid-operated machine that can be closed.   3. A fluid working machine according to claim 2, configured to operate as a pump, such that the chamber is connected to the commutator means for only a small portion of the total working stroke, and an expansion stroke. So that part of the chamber consists of partial evacuation in the chamber, and when the next reduction stroke begins, the chamber does not act as a pump immediately, but as a pump on a small portion of the way into the reduction stroke. And the controller reduces the path to the chamber expansion stroke so that only a small portion of the total geometric displacement volume of the chamber into the commutator means is displaced. A fluid operated machine that can choose to close the valve member in part.   Before the commutation valve port is in communication with the low pressure manifold, the chamber is allowed to depressurize before reaching its maximum volume state so that the remaining expansion can depressurize the fluid contained in the chamber. The fluid-operated machine of claim 2, operable to reduce energy loss of the compressed fluid by closing the valve member.