Method and apparatus for diagnosing a cyclic system
First Claim
1. A method of determining the service life of a fluid power cyclic system comprising the steps of:
- determining at least one characteristic of the cyclic system to determine a characteristic value, wherein the characteristic value is a flow rate of the system;
determining a cycle time of the cyclic system;
applying the flow rate to an algorithm in which the characteristic value is integrated over the cycle time to determine a diagnostic value; and
comparing the diagnostic value to a predetermined value to determine the service life status of the cyclic system.
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Accused Products
Abstract
A method and apparatus for determining the service life of a cyclic system the method including the steps of determining at least one characteristic of the system to determine a characteristic value and determining a cycle time of the system. The at least characteristic value is applied to an algorithm in which the characterisitic value is integrated to determine a diagnostic value, and comparing the diagnostic value to a predetermined value to determine the performance status of the system. The apparatus including a sensor for determining a system characteristic and a calculating unit operatively connected to the sensor. The calculating unit including circuitry for performing a mathematical integration on the system characteristic to determine a diagnostic value and comparing the diagnostic valve to a predetermined value to determine the performance status of the system. A notification device operatively connected to the calculating unit for indicating the operational status of the system.
70 Citations
28 Claims
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1. A method of determining the service life of a fluid power cyclic system comprising the steps of:
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determining at least one characteristic of the cyclic system to determine a characteristic value, wherein the characteristic value is a flow rate of the system; determining a cycle time of the cyclic system; applying the flow rate to an algorithm in which the characteristic value is integrated over the cycle time to determine a diagnostic value; and comparing the diagnostic value to a predetermined value to determine the service life status of the cyclic system. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11)
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12. A method of determining the service life of a cyclic fluid power system comprising the steps of:
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determining a flow rate of the cyclic fluid power system; determining a cycle time of the cyclic system; integrating the flow rate over the cycle time to determine a diagnostic value; and comparing the diagnostic value to a predetermined value to determine an operational status of the system relating to the service life of the cyclic fluid power system. - View Dependent Claims (13, 14, 15)
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16. A method of determining the service life of a cyclic system comprising the steps of:
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sensing a characteristic of the cyclic system to determine a characteristic value; applying the characteristic value to a first algorithm to determine a beginning T1 and an end T2 of a cycle; subjecting the characteristic value to a second algorithm calculated over T1 and T2 to determine a diagnostic value K; and comparing the diagnostic value to a set of known values to determine a performance status of the system relating to the service life of the cyclic system. - View Dependent Claims (17)
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18. An apparatus for determining an operational status of a cyclic fluid power system comprising:
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a sensor for sensing a system characteristic wherein the system characteristic is a flow rate; a calculating unit operatively connected to the sensor, the calculating unit including circuitry for performing a mathematical integration on the flow rate to determine a diagnostic value and comparing the diagnostic value to a predetermined value to determine the service life status of the system; and a notification device operatively connected to the calculating unit for indicating the service life status of the system. - View Dependent Claims (19, 20, 21, 22, 23)
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24. A cyclic fluid power system having an operational status monitor comprising:
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a valve in fluid communication with a fluid source; an actuator operatively connected to the valve; a sensor for determining a system characteristic wherein the system characteristic is the flow rate; a calculating unit operatively connected to the sensor, the calculating unit including circuitry for performing a mathematical integration on the system characteristic to determine a diagnostic value and comparing the diagnostic value to a predetermined value to determine the service life status of the cyclic system, wherein the mathematical integration is - View Dependent Claims (25, 26)
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27. A method of determining the service life of a cyclic system comprising the steps of:
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determining at least one characteristic of the system to determine a characteristic value; determining a cycle time of the system; applying the at least one characteristic value to an algorithm in which the characteristic value is integrated to determine a diagnostic value; evaluating the diagnostic value over a plurality of system cycles to determine a change in the diagnostic value; evaluating the cycle time over a plurality of system cycles to determine a change in the cycle time; comparing the change in diagnostic value to the change in the cycle time to determine the operational status of the system.
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28. A method of determining the service life of a fluid power cyclic system comprising the steps of:
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determining at least one characteristic of the cyclic system to determine a characteristic value, wherein the characteristic value is a flow rate of the system; determining a cycle time of the cyclic system; applying the flow rate to an algorithm in which the characteristic value is integrated over the cycle time to determine a diagnostic value; evaluating the diagnostic value over a plurality of system cycles to determine a change in the diagnostic value; evaluating the cycle time over a plurality of system cycles to determine a change in the cycle time; and comparing the change in diagnostic value to the change in the cycle time to determine the operational status of the system.
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Specification