Method and system for identifying performance degradation of a cooling subsystem in a locomotive
First Claim
1. A method for identifying degradation in performance of an engine cooling subsystem in a locomotive, the subsystem having an electric motor for powering a fan, the method comprising:
- monitoring a signal indicative of an electrical imbalance in at least one phase in the fan motor of the cooling subsystem;
adjusting the value of the monitored signal for deviations from an estimated nominal phase signal value due to predetermined external variables so as to generate an adjusted phase signal value; and
comparing the value of the adjusted phase signal value against the nominal phase signal value to determine the performance of the cooling subsystem.
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Abstract
A method and system for identifying or determining degradation in performance of an engine cooling subsystem having an electric motor for powering a fan in a locomotive is provided. The method allows for monitoring a signal indicative of an electrical imbalance in one or more phases in the fan motor of the cooling subsystem, and for adjusting the value of the monitored signal for deviations from an estimated nominal phase signal value due to predetermined external variables so as to generate an adjusted phase signal value. The method further allows for comparing the value of the adjusted phase signal value against the nominal phase signal value to determine the performance of the cooling subsystem.
53 Citations
26 Claims
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1. A method for identifying degradation in performance of an engine cooling subsystem in a locomotive, the subsystem having an electric motor for powering a fan, the method comprising:
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monitoring a signal indicative of an electrical imbalance in at least one phase in the fan motor of the cooling subsystem;
adjusting the value of the monitored signal for deviations from an estimated nominal phase signal value due to predetermined external variables so as to generate an adjusted phase signal value; and
comparing the value of the adjusted phase signal value against the nominal phase signal value to determine the performance of the cooling subsystem. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13)
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14. A system for determining degradation in cooling subsystem performance in a locomotive having an engine cooled by a fan powered by a motor, the system comprising:
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a signal monitor coupled to monitor a signal indicative of an electrical imbalance in at least one phase in the fan motor of the cooling subsystem;
a first module coupled to the signal monitor to adjust the monitored signal for deviations from an estimated nominal phase signal value due to predetermined external variables to generate an adjusted phase signal value; and
a second module coupled to the first module to receive the adjusted phase signal value, the second module configured to compare the value of the adjusted phase signal value against a nominal phase signal value to determine the performance of the cooling subsystem. - View Dependent Claims (15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25, 26)
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Specification