Alternator testing method and system using ripple detection

A technology of alternator and rectifier circuit, which is applied in the direction of motor generator test, control generator, and test of electrical devices in transportation, etc. It can solve problems such as incorrect test results and achieve the effect of reducing misdiagnosis

Inactive Publication Date: 2006-07-19
SNAP ON INC
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  • Abstract
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Problems solved by technology

This different impedance tends to affect the DC level of the alternator output signal, as described above, and thus produce incorrect test results

Method used

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  • Alternator testing method and system using ripple detection
  • Alternator testing method and system using ripple detection
  • Alternator testing method and system using ripple detection

Examples

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Embodiment Construction

[0029] For purposes of illustration, an example of the provided method and system for evaluating the operation of an alternator in an automobile will be described. In the following description, numerous specific details are set forth in order to provide a thorough understanding of the present invention. It will be apparent, however, to one skilled in the art that the present invention may be practiced without these specific details. In other instances, well-known structures and devices are shown in block diagram form in order to avoid unnecessarily obscuring the present invention.

[0030] Such as Figure 2b-2e As shown, the output waveform of an alternator with a defective rectifier component is the same as Figure 2a A normal alternator has a lower frequency than that shown in , that is, the alternator is functioning as designed. A method and system implemented in accordance with the present invention determines the health of an alternator based on the pulsation frequency...

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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.

Description

[0001] related application [0002] This application claims the benefit of priority to US Provisional Patent Application Serial No. 60 / 214,254, entitled "Automated Electrical System Testing Apparatus and Method," filed June 26,2000. technical field [0003] The present invention relates generally to the evaluation of alternator operation, and more particularly to the detection of alternator faults based on the frequency of the alternator's output signal. Background technique [0004] An alternator converts mechanical motion into alternating current (AC) through electromagnetic induction. The AC power is then passed through a rectifier component, such as a full-wave rectifier bridge consisting of diodes, which converts the AC to DC to power other electrical systems. For example, an alternator in a car is driven by the engine to power the car's electrical systems, such as charging the battery, powering the headlights, and so on. [0005] Even with rectification, the output o...

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01R31/34H02P9/00
CPCG01R31/006G01R31/343G01R23/14
Inventor 丹尼斯G·蒂贝迪奥里查德J·芬里希亚历杭德罗P·布罗特阿兰D·格策尔曼保罗A·威廉斯
Owner SNAP ON INC
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