Method and device for determining a wear condition in a hydrostatic pump
AssigneeMoog Inc.
InventorDirk Becher
Life of this patent
Estimating the term…
Abstract
A method for determining a current wear (w) of a hydrostatic pump, particularly of a radial piston pump, with a variable-speed drive, where the pump is connected to a fluid passage, in which a fluid is pumped by the pump to create a current actual volume flow in the fluid passage. A current actual volume flow (Qact) is determined, by measuring the volume flow in the fluid passage at a predetermined drive-vector, a computed volume flow (Qcomp) is determined, by a first computational method, at the predetermined drive-vector, and the current wear (w) of the pump is determined, by a second computational method, which relates the current actual volume flow (Qact) to the computed volume flow (Qcomp).
Claims16
A method for determining a current wear of a hydrostatic pump, the method comprising:
- providing a variable-speed electric motor operable to drive the hydrostatic pump;
- providing a fluid passage connected with the hydrostatic pump, wherein a fluid is communicated through the fluid passage by the hydrostatic pump, the hydrostatic pump creating a current actual volume flow in the fluid passage;
- determining the current actual volume flow (Qact) by measuring the volume flow in the fluid passage at a predetermined drive-vector, wherein the pre-determined drive-vector includes a first pressure and a second pressure of the fluid;
- determining a computed volume flow (Qcomp) by a first computational method, at the predetermined drive-vector;
- and
- determining the current wear of the hydrostatic pump by a second computational method, which relates the current actual volume flow (Qact) to the computed volume flow (Qcomp),
- wherein the first pressure is a working pressure of the fluid, and the second pressure is a preload pressure of the fluid.
An electro-hydrostatic pump device, comprising:
- a radial piston pump;
- a variable-speed motor operable to drive the radial piston pump;
- and
- an electronic control unit;
- wherein the radial piston pump is connected to a fluid passage in which a fluid is communicated by the radial piston pump, the radial piston pump operable to create a current actual volume flow in the fluid passage,
- wherein the electronic control unit is operable to measure the volume flow in the fluid passage at a predetermined drive-vector including a first pressure and a second pressure of the fluid, respectively, to determine the current actual volume flow (Qact);
- wherein the electronic control unit is operable to determine a computed volume flow (Qcomp) by a first computational method, at the predetermined drive-vector including the first pressure and the second pressure of the fluid, respectively;
- and
- wherein the electronic control unit is operable to determine the current wear (w) of the pump by a second computational method, which relates the current actual volume flow (Qact) to the computed volume flow (Qcomp),
- wherein the first pressure is a working pressure of the fluid, and the second pressure is a preload pressure of the fluid.
Dependencies are inferred from the claim text.