Method and apparatus for lubrication fluid analysis

• US 5,817,928 A
• Filed: 04/14/1997
• Issued: 10/06/1998
• Est. Priority Date: 04/14/1997
• Status: Expired due to Term

• Current Assignee: Computational Systems Incorporated (Emerson Electric Company)
• Original Assignee: CSI Technology Incorporated (Emerson Electric Company)
• Inventors: Hayzen, Anthony John, Fogel, Anthony Grahame, Garvey, Raymond E. III
• Primary Examiner(s): Williams, Herzone E.
• Assistant Examiner(s): WIGGINS, JOHN DAVID
• Application Number:
  US08/838,009
• Time in Patent Office: 540 Days
• Field of Search: 73/53.05, 73/53.01, 73/10, 324/698, 324/71.1, 324/204
• US Class Current: 73/53.05
• CPC Class Codes: G01N 33/2888 Lubricating oil characteristics, e.g. deterioration lubricating properties G01N33/30

Abstract

A method is provided for evaluating a multiplicity of lubrication quality parameters. For a particular lubrication system, a parameter profile is designated to define all the measurable parameters to be monitored. Each parameter in the profile is assigned to single category respective to WEAR, CHEMISTRY and CONTAMINATION. Parameter values are proportionalized in a finite number of increments between acceptable and unacceptable limits. The worst case parameter of a category is selected to represent that category on a 3-axis, Cartesian graph for placing a data point along the respective category axis. Three data points respective to the three axes are linked with a triangular plane, the area of which is representative of the system quality state.

Claims

1. A method of evaluating the quality status of a lubrication application, said method comprising the steps of:

defining a specific lubrication application;

defining a profile of measurable lubrication fluid parameters, each parameter reflecting a quality status of said lubrication application;

for each of said measurable fluid parameters, defining a spectrum of values between a good parameter quality and an alarming degree of poor parameter quality;

for each of said fluid parameters, dividing said spectrum of values into a finite number of increments, said number of increments being substantially the same for all fluid parameters;

defining three parametric categories for said fluid parameters respective to (a) equipment wear, (b) fluid chemistry and (c) fluid contamination;

assigning each of said fluid parameters to one of said parametric categories;

defining three, mutually perpendicular, orthogonal axes having said finite number of increments measured from a point of mutual axis origin;

assigning each of said parametric categories to one of said orthogonal axes;

from a physical example of said specific lubrication application, measuring said profile parameters;

respective to the measured parameters of each parametric category, identifying that parameter having a value most advanced toward an alarming degree of poor quality;

Normalization assigning a data point on each of said orthogonal axes respective to the most advanced parameter value among parameters in the parametric category assigned to each respective axis, said data point being proportionately located within the same increment along the respective axis as was assigned to the respective fluid parameter value; and

,

Linearly connecting the data points respective to each of said axes to define a triangular plane intersecting said axes for an integrated visual display of said three parametric categories, the shape and size of said plane being indicative of the quality status of said physical example of said specific lubrication application.

2. A method as described by claim 1 wherein each increment of a given order of amplitude in parameter value along an axis is connected to other increments of the same order of amplitude in parameter value by a spacial plane of distinctive color.

3. A method as described by claim 1 wherein the parameter profile for the parametric category of contamination comprises an accounting of particles suspended in or circulating with said lubrication fluid.

4. A method as described by claim 3 wherein said accounting comprises a solid particle count.

5. A method as described by claim 4 wherein said solid particle count is of ferrous particles larger than a predetermined minimum.

6. A method as described by claim 4 wherein said solid particle count is of non-ferrous particles larger than a predetermined minimum.

7. A method as described by claim 3 wherein said parametric category of contamination comprises evaluations for the presence of water, glycol, soot, gases or fuel.

8. A method as described by claim 1 wherein said parametric profile for the category of equipment wear comprises a wear particle test.

9. A method as described by claim 1 wherein said parametric profile of fluid chemistry comprises tests for viscosity, color, acidity, oxidation, nitration and sulfation.

10. The combination including at least one instrument for measuring characteristic properties of lubrication fluids used in a mechanical system respective to parametric categories comprising chemistry, contamination and wear, said instruments having a signal transmission connection with a data processing unit for transmitting signals to said data processing unit proportional to measured values of said properties, program control means within said data processing unit for rating each of said measured values with a proportionally positioned point along a respective parameter scale, each parameter scale having a predetermined number of quality increments over a spectrum of quality values between a desirable operating boundary and a highly undesirable operating value, said predetermined number of increments being substantially the same for all of said parameter scales, said program control means further comparing the ratings of substantially all parameter values corresponding to a respective parameter category and isolating that parameter rating most advanced toward undesirable operating qualities to represent the respective parametric category, and visual display means connected with said data processing unit for display of a planar representation of a three dimensional graph having three, mutually perpendicular graph axes, each of said parametric categories being assigned to a respective one of said axes, said program control means including normalization by further placing an axis point along each of the parametric category axes at a location that proportionally corresponds to the proportionally positioned point respective to the isolated parameter representing the parametric category of a respective axis and graphically connecting said axis points with substantially straight lines to form a triangular plane there between that intersects each of said three graph axes for an integrated visual display of said parametric categories.

11. The combination as described by claim 10 wherein said visual display means comprises a video monitor.

12. The combination as described by claim 10 wherein said visual display means comprises a printer.

13. The combination as described by claim 10 further comprising audio alarm means responsive to said program control means.