Machine data acquisition system with data compression

• US 7,996,185 B2
• Filed: 04/29/2008
• Issued: 08/09/2011
• Est. Priority Date: 04/29/2008
• Status: Active Grant

• Current Assignee: Caterpillar Incorporated
• Original Assignee: Caterpillar Incorporated
• Inventors: Lang, Joseph Anthony, Cole, Todd Philip, Hazen, Mark Ryan, Janik, David Charles, O'Neal, Steven Wayne
• Primary Examiner(s): BHAT, ADITYA S
• Application Number:
  US12/149,220
• Publication Number:
  US 20090271151A1
• Time in Patent Office: 1,197 Days
• Field of Search: 702/187
• US Class Current: 702/187
• CPC Class Codes: H03M 7/30 Compression speech analysis-synthesis for redundancy reduction G10L19/00; for image communication H04N; Expansion; Suppression of unnecessary data, e.g. redundancy reduction

Abstract

A machine data acquisition system is disclosed. The data acquisition system may include a sensor disposed on a machine and configured to produce a signal indicative of an operational parameter of the machine. The system may also include a data processor and controller configured to convert the signal into a plurality of parameter data points. The system may further include a primary data circular buffer disposed on the machine and configured to store the plurality of parameter data points. Additionally, a variable resolution circular buffer may be disposed on the machine and configured to store a compressed parameter data point calculated from the plurality of parameter data points.

Claims

1. A data acquisition system, comprising:

a sensor disposed on a machine and configured to produce a signal indicative of an operational parameter of the machine;

a data processor and controller configured to convert the signal into a plurality of parameter data points;

a primary data circular buffer disposed on the machine and configured to store the plurality of parameter data points; and

a variable resolution circular buffer disposed on the machine and configured to store a compressed parameter data point calculated from the plurality of parameter data points.

2. The data acquisition system of claim 1, wherein the variable resolution circular buffer is a first variable resolution circular buffer and the system further includes a second variable resolution circular buffer disposed on the machine and configured to store compressed parameter data points calculated from a plurality of compressed parameter data points.

3. The data acquisition system of claim 1, wherein the variable resolution circular buffer is a first variable resolution circular buffer and the system further includes a second and third variable resolution circular buffers disposed on the machine and configured to store compressed parameter data points calculated from parameter data points or calculated from compressed parameter data points, the three variable resolution circular buffers including a first variable resolution circular buffer storing compressed parameter data points calculated from parameter data points stored in the primary data circular buffer, a second variable resolution circular buffer storing compressed parameter data points calculated from compressed parameter data points stored in the first variable resolution circular buffer, and a third variable resolution circular buffer storing compressed parameter data points calculated from compressed parameter data points stored in the second variable resolution circular buffer.

4. The data acquisition system of claim 1, further including a communication module configured to communicate the parameter data points and compressed parameter data points to an off-board system for storage or analysis.

5. The data acquisition system of claim 4, wherein the communication module is configured to wirelessly communicate with the off-board system.

6. The data acquisition system of claim 1, wherein the data acquisition system is configured to calculate a representative compressed parameter data point for a time period of parameter data points.

7. The data acquisition system of claim 6, wherein the data acquisition system is configured to calculate and store for the representative compressed parameter data point one or more of the following:

a minimum parameter data point value;

a maximum parameter data point value;

a variance;

a standard deviation;

a number of parameter data points compressed; and

the time period of the compressed parameter data point.

8. The data acquisition system of claim 6, wherein the representative compressed parameter data point is the average of the parameter data points for the time period of parameter data points to be compressed.

9. A method of acquiring machine data, comprising:

sensing a signal associated with an operational parameter of a machine;

converting the sensed signal into a plurality of parameter data points;

storing the plurality of parameter data points in a primary circular data buffer; and

compressing and storing a compressed parameter data point in a variable resolution circular buffer.

10. The method of claim 9, further including storing a compressed parameter data point calculated from a plurality of compressed parameter data points.

11. The method of claim 10, further including storing two series of compressed parameter data points calculated from other series of compressed parameter data points, wherein a first compressed parameter data point is calculated from a series of parameter data points, a second compressed parameter data point is calculated from a series of first compressed parameter data points, and a third compressed parameter data point is calculated from the second series of compressed parameter data points.

12. The method of claim 9, further including communicating the parameter data points and compressed parameter data points to an off-board system for storage or analysis.

13. The method of claim 9, wherein compressing and storing includes calculating a representative compressed parameter data point for a time period of parameter data points.

14. The method of claim 13, wherein compressing and storing includes calculating and storing for each compressed parameter data point one or more of the following:

a minimum parameter data point value;

a maximum parameter data point value;

a variance;

a standard deviation;

a number of parameter data points compressed; and

the time period of the compressed parameter data point.

15. The method of claim 13, wherein compressing and storing further includes calculating an average of the parameter data points and storing the average as the compressed parameter data point for the time period of parameter data points to be compressed.

16. The method of claim 9, further comprising calculating and storing a value indicative of a predictability or variability of the compressed parameter data point.

17. A machine, comprising:

a power source configured to power operations of the machine;

a frame operatively coupled to the power source; and

a data acquisition system disposed on the machine, including;

a sensor disposed on the machine and configured to produce a signal indicative of an operational parameter of the machine;

a data processor and controller configured to convert the signal into a plurality of parameter data points;

a primary data circular buffer disposed on the machine and configured to store the plurality of parameter data points; and

a variable resolution circular buffer disposed on the machine and configured to store a compressed parameter data point calculated from the plurality of parameter data points, wherein the data acquisition system is configured to calculate the compressed parameter data point as an average of the plurality of parameter data points, a minimum of the plurality of parameter data points, or a maximum of the plurality of parameter data points.

18. The machine of claim 17, wherein the variable resolution circular buffer is a first variable resolution circular buffer and the machine further includes a second and third variable resolution circular buffers disposed on the machine and configured to store compressed parameter data points calculated from parameter data points or calculated from compressed parameter data points, the three variable resolution circular buffers including a first variable resolution circular buffer storing compressed parameter data points calculated from parameter data points stored in the primary data circular buffer, a second variable resolution circular buffer storing compressed parameter data points calculated from compressed parameter data points stored in the first variable resolution circular buffer, and a third variable resolution circular buffer storing compressed parameter data points calculated from compressed parameter data points stored in the second variable resolution circular buffer.

19. The machine of claim 17, further including a communication module configured to wirelessly communicate the parameter data points and compressed parameter data points to an off-board system for storage or analysis.

20. The machine of claim 17, wherein the data acquisition system is configured to calculate a representative compressed parameter data point for a time period of parameter data points and store the representative compressed parameter data point as one compressed parameter data point, and the data acquisition system is further configured to calculate and store for each compressed parameter data point one or more of the following:

a variance;

a standard deviation;

a number of parameter data points compressed; and

the time period of the compressed parameter data point.

21. The machine of claim 20, wherein the representative compressed parameter data point is the average of the parameter data points for the time period of parameter data points to be compressed.