Back to results
US 2014/0109647 A1Published application
System for Determining Coefficients of Seal Friction
AssigneeCaterpillar Inc.
InventorsJoseph Faivre, Yongliang Zhu, Drew A. Fehr
Life of this patent
Estimating the term…
Abstract
A system for determining a hydraulic seal coefficient of friction of a hydraulic cylinder includes a force sensor to provide a force signal indicative of a force of the cylinder. A controller is configured to receive a plurality of first force signals at a first load and determine a first friction force and receive a plurality of second force signals at a second load and determine a second friction force. A hydraulic seal coefficient of friction is determined based at least in part upon the first friction force and the second friction force. A method is also disclosed.
Claims20
A system for determining a hydraulic seal coefficient of friction of a hydraulic cylinder, comprising:
- a linkage member for moving a load, the linkage member being movable along a path;
- a hydraulic cylinder operatively connected to the linkage member for moving the linkage member along the path;
- a force sensor configured to provide a force signal indicative of a force of the hydraulic cylinder;
- and
- a controller configured to:
- receive a plurality of first load first direction force signals as the linkage member is moved along the path in a first direction and the linkage member engages a first load;
- receive a plurality of first load second direction force signals as the linkage member is moved along the path in a second direction, the second direction being generally opposite the first direction;
- determine a first friction force based at least in part upon a difference between the plurality of first load first direction force signals and the plurality of first load second direction force signals;
- receive a plurality of second load first direction force signals as the linkage member is moved along the path in the first direction and the linkage member engages a second load;
- receive a plurality of second load second direction force signals as the linkage member is moved along the path in the second direction and the linkage member engages the second load;
- determine a second friction force based at least in part upon a difference between the plurality of second load first direction force signals and the plurality of second load second direction force signals;
- and
- determine a hydraulic seal coefficient of friction based at least in part upon the first friction force and the second friction force.
10 more elements
A controller implemented method of determining a hydraulic seal coefficient of friction of a hydraulic cylinder, comprising:
- receiving a plurality of first load first direction force signals as a linkage member is moved along a path in a first direction and the linkage member engages a first load;
- receiving a plurality of first load second direction force signals as the linkage member is moved along the path in a second direction, the second direction being generally opposite the first direction;
- determining a first friction force based at least in part upon a difference between the plurality of first load first direction force signals and the plurality of first load second direction force signals;
- receiving a plurality of second load first direction force signals as the linkage member is moved along the path in the first direction and the linkage member engages a second load;
- receiving a plurality of second load second direction force signals as the linkage member is moved along the path in the second direction and the linkage member engages the second load;
- determining a second friction force based at least in part upon a difference between the plurality of second load first direction force signals and the plurality of second load second direction force signals;
- and
- determining a hydraulic seal coefficient of friction based at least in part upon the first friction force and the second friction force.
5 more elements
A machine comprising:
- prime mover;
- a linkage member for moving a load, the linkage member being movable along a path;
- a hydraulic cylinder operatively connected to the linkage member for moving the linkage member along the path, the hydraulic cylinder being operatively connected to the prime mover;
- a force sensor configured to provide a force signal indicative of a force of the hydraulic cylinder;
- and
- a controller configured to:
- receive a plurality of first load first direction force signals as the linkage member is moved along the path in a first direction and the linkage member engages a first load;
- receive a plurality of first load second direction force signals as the linkage member is moved along the path in a second direction, the second direction being generally opposite the first direction;
- determine a first friction force based at least in part upon a difference between the plurality of first load first direction force signals and the plurality of first load second direction force signals;
- receive a plurality of second load first direction force signals as the linkage member is moved along the path in the first direction and the linkage member engages a second load;
- receive a plurality of second load second direction force signals as the linkage member is moved along the path in the second direction and the linkage member engages the second load;
- determine a second friction force based at least in part upon a difference between the plurality of second load first direction force signals and the plurality of second load second direction force signals;
- and
- determine a hydraulic seal coefficient of friction based at least in part upon the first friction force and the second friction force.
11 more elements
Dependencies are inferred from the claim text.