Method and apparatus for determining the severity of a trend toward an impending machine failure and responding to the same

• US 6,442,511 B1
• Filed: 09/03/1999
• Issued: 08/27/2002
• Est. Priority Date: 09/03/1999
• Status: Expired due to Fees

• Current Assignee: Caterpillar Incorporated
• Original Assignee: Caterpillar Incorporated
• Inventors: Sarangapani, Jagannathan, Rangarajan, Sri K.
• Primary Examiner(s): Hilten, John S.
• Assistant Examiner(s): LE, JOHN H
• Application Number:
  US09/390,063
• Time in Patent Office: 1,089 Days
• Field of Search: 702/34, 702/81, 702/82, 702/181, 702/183, 702/185, 702/187, 340/501, 701/114
• US Class Current: 702/194
• CPC Class Codes: G06F 11/008 Reliability or availability analysis

Abstract

A method and apparatus for determining severity of a trend toward an impending machine failure under actual operating conditions. The method and apparatus includes providing a typical failure trend based on a set of normal operating conditions for the machine, determining a slope value for the typical failure trend, determining a slope value for the trend toward the impending machine failure under the actual or proposed operating conditions, determining a weight value for at least the actual or proposed operating conditions, and determining the severity as a function of the slope values and the weight value.

Claims

1. A method for determining severity of a trend toward an impending machine failure under actual operating conditions, comprising the steps of:

(a) providing a typical failure trend based on a set of normal operating conditions for the machine;

(b) providing a trend toward an impending machine failure under actual operating conditions;

(c) determining a slope value for the typical failure trend;

(d) determining a slope value for the trend toward the impending machine failure under the actual operating conditions;

(e) determining a weight value for at least the actual operating conditions; and

(f) determining the severity as a function of the slope values and the weight value.

2. The method of claim 1, wherein the weight value is determined for the typical failure trend and the severity is determined as a function of the slopes and the weight values for the normal operating conditions and the actual operating conditions.

3. The method of claim 2, wherein the weight value for the normal operating conditions is determined based on data selected from the group consisting of projected life data for the machine, design data for the machine, environmental data, experimental data, application specific data, and combinations thereof.

4. The method of claim 1, wherein the weight value for the actual operating conditions is determined from data selected from the group consisting of load data, temperature data, pressure variation data, environmental data, application data, and combinations thereof.

5. The method of claim 1, wherein the severity is compared to a typical severity value, and if greater, then a signal is outputted for alerting appropriate personnel.

6. The method of claim 1, wherein the severity is compared to a typical value, and if the severity is greater than the typical value, a root cause of the severity is determined as a function of at least the actual operating conditions.

7. The method of claim 1, wherein the severity is determined as a function of a severity trend.

8. The method of claim 1, wherein the determined severity is compared to a predetermined typical severity profile value, and, if greater than the typical profile, a problem is identified and the severity associated with current events or conditions to determine a root cause for the severity.

9. Apparatus for determining severity of a trend toward an impending machine failure under actual operating conditions, comprising:

(a) a stored typical failure trend based on a set of normal operating conditions for the machine; and

(b) a processor operable for;

(i) determining a slope value for the typical failure trend;

(ii) determining a trend toward an impending machine failure under actual operating conditions;

(iii) determining a slope value for the trend toward the impending machine failure under the actual operating conditions;

(iv) determining a weight value for at least the actual operating conditions; and

(v) determining the severity as a function of the slope values and the weight value.

10. Apparatus of claim 9, wherein the weight value is determined for the typical failure trend and the processor determines the severity as a function of the slopes and the weight values for the normal operating conditions and the actual operating conditions.

11. Apparatus of claim 9, wherein the weight value for the actual operating conditions is determined from data selected from the group consisting of load data, temperature data, pressure variation data, environmental data, application data, and combinations thereof.

12. Apparatus of claim 11, further comprising at least one sensor for sensing one of the operating conditions connected to the processor for providing data representative of the sensed operating condition thereto.