Alternator testing method and system using ripple detection
First Claim
1. A method for evaluating operation of an alternator comprising:
- detecting a frequency component of an alternator output signal;
comparing the frequency component of the alternator output signal with a threshold frequency; and
evaluating operation of the alternator based on a result of the comparing step.
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Abstract
A method and system for evaluating the operation of an alternator based on a frequency component in the alternator output signal. The method comprises detecting a frequency component of the alternator output signal, comparing the frequency component of the alternator output signal with a threshold frequency, and evaluating the operation of the alternator based on a result of the comparison. If the frequency component of the alternator output signal is lower than the threshold frequency, the alternator is determined as defective. The frequency component can be obtained by comparing the alternator output signal with an adaptive threshold. The adaptive threshold is generated based on the peak signal level and the valley signal level of the alternator output signal, such as the average of the peak signal level and valley signal level.
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Citations
22 Claims
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1. A method for evaluating operation of an alternator comprising:
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detecting a frequency component of an alternator output signal;
comparing the frequency component of the alternator output signal with a threshold frequency; and
evaluating operation of the alternator based on a result of the comparing step. - View Dependent Claims (2, 3)
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4. A system for evaluating the operation of an alternator comprising:
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a terminal for receiving an alternator output signal representative of an output of the alternator;
a frequency detection device for detecting a frequency component of the alternator output signal;
a controller for comparing the frequency component of the alternator output signal to a threshold frequency, and generating an indication signal based a result of the comparison; and
an indication device responsive to the content of the indication signal for indicating the operation of the alternator. - View Dependent Claims (5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15)
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16. A system for evaluating the operation of an alternator comprising:
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a terminal for receiving an alternator output signal representative of an output of the alternator;
an adaptive threshold device for generating a reference threshold based on the level of the alternator output signal according to a predetermined rule;
a comparator for comparing the level of the alternator output signal with the reference threshold and generating a frequency signal indicating the frequency component of the alternator output signal based on the comparison result;
a controller for comparing the frequency component of the alternator output signal with a threshold frequency, and generating an indication signal representative of the operation of the alternator based on the comparison result of the frequency component and the threshold frequency; and
an indication device responsive to the content of the indication signal for indicating the operation of the alternator. - View Dependent Claims (17)
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18. A system for evaluating the operation of an alternator comprising:
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means for receiving an alternator output signal representative of an output of the alternator;
means for detecting a frequency component of the alternator output signal;
means for comparing the frequency component of the alternator output signal to a threshold frequency;
means for generating an indication signal based the comparison result; and
an indication device responsive to the content of the indication signal for indicating the operation of the alternator. - View Dependent Claims (19, 20, 21, 22)
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Specification