Monitoring apparatus and method

• US 5,893,047 A
• Filed: 09/26/1996
• Issued: 04/06/1999
• Est. Priority Date: 01/12/1994
• Status: Expired due to Fees

• Current Assignee: Drallim Industries Limited (AW Millard 1983 Trust)
• Original Assignee: Drallim Industries Limited (AW Millard 1983 Trust)
• Inventors: Gimblett, Christopher Francis, Essam, Derek Mark
• Primary Examiner(s): Barlow, John
• Assistant Examiner(s): Vo, Hien
• Application Number:
  US08/669,495
• Time in Patent Office: 922 Days
• Field of Search: 364/551.01, 364/468.01, 364/468.24, 364/474.16, 364/570, 364/470.01, 364/470.14, 364/183, 364/184, 364/476.01, 364/528.1, 324/73.1, 702/42, 702/33
• US Class Current: 702/33
• CPC Class Codes: G05B 19/0428 Safety, monitoring G05B19/0423 takes precedence

Abstract

The present invention provides a method of monitoring a cyclic system comprising a plurality of cyclic means, comprising measuring a single parameter for the complete cyclic system, and, during a learning mode, cycling the cyclic system a plural number of times, and from the measured value of the parameter, providing a range of acceptable values, and during a subsequent monitoring mode comparing the measured value of said parameter with said range of values, and providing an output signal if the measured value of the parameter is outside said range of values. An apparatus for monitoring such a cyclic system is also provided, including a transducer means connected to detect one parameter of the cyclic system, a means to distinguish a learning mode of the system from a monitoring mode, a receive means to receive the output signal from the transducer means at predetermined points in the cycle of the cyclic system, a memory means operable during the learning mode to store values, a means to provide ranges of said values for each point in the cycle, a comparison means operable during the monitoring mode to compare for each point in the cycle the value of the output signals detected with the range of values for that point, and a means to provide a signal if the detected values are outside their range.

Claims

1. A cyclic system comprising;

a plurality of cyclic means comprising a plurality of separately operable means provided with a common source of power,

transducer means connected to detect one parameter related to the source of power of the cyclic system common to the plurality of cyclic means;

and monitoring apparatus comprising;

means to distinguish a learning mode of the system from a monitoring mode;

receive means to receive the output signal from said transducer means at predetermined points in the cycle of the cyclic system;

memory means operable during said learning mode to store values relating to the output signal from said transducer means at said predetermined points in the cycle;

means to provide ranges of said values for each said point in the cycle;

calculator means, operable during the monitoring mode, to compare, for each said point in the cycle the value of the output signal detected with the range of values for that point,

and indicator means to provide an indication signal if detected values are outside their range.

2. A system as claimed in claim 1 in which distinguishing means is provided to distinguish at which point or points in the cycle the detected value lies outside its range.

3. A system as claimed in claim 2 in which said distinguishing means includes a further transducer means to detect another parameter.

4. A system as claimed in claim 2 which said distinguishing means comprises timing means for timing from the beginning of the cycle.

5. A system as claimed in claim 4 in which means is provided to detect the start signal of a cycle.

6. A system as claimed in claim 1 in which said means to provide ranges of said values for each point in the cycle provides said ranges of values during repetitive cycling of said system during said learning mode.

7. A system as claimed in claim 1 in which said means to provide ranges of said values for each point in the cycle provides at least some of said ranges as predetermined ranges.

8. A system as claimed in claim 1 including means to provide said range of values by an algorithm using standard deviation (SD) techniques.

9. A system as claimed in claim 1 in which said memory means also stores said ranges of values.

10. A system as claimed in claim 1 in combination with a pneumatic system, said plurality of cyclic means comprising a plurality of means which are driven pneumatically from a single pressure air supply, said transducer means being connected to measure the air flow rate to the pneumatic system.

11. A system as claimed in claim 1 in which said predetermined points are such that said parameter is provided to or by a different combination of said plurality of cyclic means in different proportions so that said calculator means is operable, during the monitoring mode, to determine which cyclic means are at fault from which point in the cycle the value of the output signal detected is outside the range of values for that point.

12. A cyclic system as claimed in claim 1 in which an indicator means is provided to provide an indication signal if detected values over a plurality of cycles are changing towards the edge of the range of values.

13. A system as claimed in claim 1 in which the memory means stores patterns of change of the output signal from said transducer means at said predetermined points in the cycle and data relating to faults of the cyclic system related to that change of pattern.

14. A system as claimed in claim 13 in which said calculator means is operable during the monitoring mode, to compare, for each said point in the cycle, the pattern or change of detected value with the stored patterns and if the detected pattern is the same or similar to the stored pattern in the memory.

19. A method as claimed in claim 1 in which said parameter comprises the sound produced by the cyclic system.

20. A method as claimed in claim 1 in which the parameter is derived from a digital image of the cyclic system.

15. A method of monitoring a cyclic system comprising a plurality of separately operable means provided with a common source of power, said method comprising;

detecting a parameter related to the source of power of the system at predetermined points in the cycle of the cyclic system;

during a learning mode cycling the cyclic system a plural number of times, storing values relating to the detected signal at said predetermined points in the cycle of the cyclic system; and

calculating ranges of said values for each point in the cycle, and

during a monitoring mode, comparing for each said predetermined point in the cycle the values of the signals detected with a range of values, and providing a signal if detected values are outside their range.

16. A method of monitoring a cyclic system comprising a plurality of separately operable means provided with a common source of power, comprising measuring a single parameter related to the source of power for the complete cyclic system, and, during a learning mode, cycling the cyclic system a plural number of times, and from the measured value of the parameter, providing a range of acceptable values, and during a subsequent monitoring mode comparing the measured value of said parameter with said range of values, and providing an output signal if the measured value of the parameter is outside said range of values.

17. A method as claimed in claim 16 in which said parameter comprises the flow rate of an air supply to a cyclic system which comprises a plurality of pneumatic means.

18. A method as claimed in claim 16 in which said parameter comprises an electric current supplied to a cyclic system which comprises a plurality of electric operated means.

21. A monitoring apparatus for monitoring a cyclic system comprising a plurality of separately operable means provided with a common source of power;

transducer means connected to detect a parameter related to the source of power of the cyclic system;

and monitoring apparatus comprising;

means to distinguish a learning mode of the system from a monitoring mode;

receive means to receive the output signal from said transducer means at predetermined points in the cycle of the cyclic system;

memory means operable during said learning mode to store values relating to patterns of change of the output signal from said transducer means at said predetermined points in the cycle and data relating to faults of the cyclic system related to that change of pattern;

calculator means, operable during the monitoring mode, to compare, for each said point in the cycle the pattern of change of the output signal detected with the stored patterns,

and indicator means to provide a signal if the patterns of change of detected values are the same or similar to patterns stored in the memory.

22. A method of monitoring a cyclic system comprising a plurality of separately operable means provided with a common source of power, said method comprising;

detecting a parameter related to the source of power of the system at predetermined points in the cycle of the cyclic system;

during a learning mode cycling the cyclic system a plural number of times, storing values relating to patterns of change of the output signal from said transducer means at said predetermined points in the cycle and data relating to faults of the cyclic system related to that change of pattern, and

during a monitoring mode, comparing for each said predetermined point in the cycle the pattern of change of the output signal detected with the stored patterns, and providing a signal if the patterns of change of detected values are the same or similar to patterns stored in a memory.

23. A method as claimed in claim 22 in which the signal provided if the patterns of change of detected values are the same or similar to patterns stored in the memory provides an indication of the data relating to the fault of the cyclic system related to that change of pattern.

24. A cyclic system comprising;

a plurality of cyclic means comprising a plurality of separately operable means provided with a common source of power,

transducer means connected to detect a parameter related to the source of power of the cyclic system common to the plurality of cyclic means;

and monitoring apparatus comprising;

receive means to receive the output signal from said transducer means at predetermined points in the cycle of the cyclic system;

memory means operable to store values relating to the output signal from said transducer means at said predetermined points in the cycle;

means to provide ranges of said values for each said point in the cycle;

calculator means, operable to compare, for each said point in the cycle the value of the output signal detected with the range of values for that point,

and indicator means to provide an indication signal if detected values are outside their range.

25. A method of monitoring a cyclic system comprising a plurality of separately operable means provided with a common source of power, said method comprising;

detecting a parameter related to the source of power of the system common to the plurality of cyclic means at predetermined points in the cycle of the cyclic system;

storing values relating to the detected signal at said predetermined points in the cycle of the cyclic system; and

calculating ranges of said values for each point in the cycle, and

comparing for each said predetermined point in the cycle the values of the signals detected with a range of values, and providing a signal if detected values are outside their range.

26. A monitoring apparatus for monitoring a cyclic system comprising a plurality of separately operable means provided with a common source of power;

transducer means connected to detect a parameter related to the source of power of the cyclic system;

and monitoring apparatus comprising;

receive means to receive the output signal from said transducer means at predetermined points in the cycle of the cyclic system;

memory means operable to store values relating to patterns of change of the output signal from said transducer means at said predetermined points in the cycle and data relating to faults of the cyclic system related to that change of pattern;

calculator means, operable to compare, for each said point in the cycle the pattern of change of the output signal detected with the stored patterns,

and indicator means to provide a signal if the patterns of change of detected values are the same or similar to patterns stored in the memory.

27. A method of monitoring a cyclic system comprising a plurality of cyclic means comprising a plurality of separately operable means provided with a common source of power, said method comprising;

detecting a parameter of the system related to the source of power common to the plurality of cyclic means at predetermined points in the cycle of the cyclic system;

during a learning mode cycling the cyclic system a plural number of times, storing values relating to patterns of change of the output signal from said transducer means at said predetermined points in the cycle and data relating to faults of the cyclic system related to that change of pattern, and

during a monitoring mode, comparing for each said predetermined point in the cycle the pattern of change of the output signal detected with the stored patterns, and providing a signal if the patterns of change of detected values are the same or similar to patterns stored in a memory.

28. A method of monitoring a cyclic system comprising a plurality of cyclic means, said method comprising;

detecting a parameter of the system common to the plurality of cyclic means at predetermined points in the cycle of the cyclic system;

storing values relating to the detected signal at said predetermined points in the cycle of the cyclic system, and calculating ranges of said values for each point in the cycle; and

comparing for each said predetermined point in the cycle the values of the signals detected with a range of values, and providing a signal if detected values are outside their range, said predetermined points being such that said parameter is provided to or by a different combination of said plurality of cyclic means in different proportions whereby to determine which cyclic means are at fault from which point in the cycle the value of the output signal detected is outside the range of values for that point.

29. A monitoring apparatus for monitoring a cyclic system comprising;

transducer means connected to detect a parameter of the cyclic system;

and monitoring apparatus comprising;

receive means to receive the output signal from said transducer means at predetermined points in the cycle of the cyclic system;

memory means operable to store values relating to patterns of change of the output signal from said transducer means at said predetermined points in the cycle and data relating to faults of the cyclic system related to that change of pattern;

calculator means, operable to compare, for each said point in the cycle the pattern of change of the output signal detected with the stored patterns,

and indicator means to provide a signal if the patterns of change of detected values are the same or similar to patterns stored in the memory, said predetermined points being such that said parameter is provided to or by a different combination of said plurality of cyclic means in different proportions so that said calculator means is operable to determine which cyclic means are at fault from which point in the cycle the value of the output signal detected is outside the range of values for that point.