Method and apparatus for detecting an abnormal current in automotive wiring harnesses
First Claim
1. A method of detecting an abnormal current in automotive wiring harnesses, comprising the steps of:
- measuring currents flowing between an automotive battery and power supply wiring harnesses connecting the battery and a plurality of loads;
measuring a voltage of the battery;
calculating resistance values between the battery and the wiring harnesses based on the measured current between the battery and the wiring harnesses and the measured battery voltage; and
comparing the calculated resistance values between the battery and the wiring harnesses with data on normal resistance values between the battery and the wiring harnesses as produced by each of the loads being activated, to determine whether any abnormal current is flowing in the wiring harnesses.
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Accused Products
Abstract
A current flowing through the automotive battery and the battery voltage are measured by the battery current measuring means and the battery voltage measuring means. The battery is connected to a plurality of wiring harnesses which in turn connect to a plurality of loads. Data on normal resistance values between the battery and the wiring harnesses as produced by each of the loads being activated are stored and held in the load current data holding means. When the resistance value comparison means determines that the resistance value between the battery and the wiring harnesses calculated by the resistance value calculating means does not agree with the data of normal resistance values between the battery and the wiring harnesses held by the load resistance data holding means and produced by each of the loads being activated, it is decided that abnormal currents are flowing through the wiring harnesses.
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Citations
8 Claims
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1. A method of detecting an abnormal current in automotive wiring harnesses, comprising the steps of:
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measuring currents flowing between an automotive battery and power supply wiring harnesses connecting the battery and a plurality of loads; measuring a voltage of the battery; calculating resistance values between the battery and the wiring harnesses based on the measured current between the battery and the wiring harnesses and the measured battery voltage; and comparing the calculated resistance values between the battery and the wiring harnesses with data on normal resistance values between the battery and the wiring harnesses as produced by each of the loads being activated, to determine whether any abnormal current is flowing in the wiring harnesses. - View Dependent Claims (2, 3, 4)
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5. An apparatus for detecting an abnormal current in automotive wiring harnesses, comprising:
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a battery current measuring means for measuring currents flowing between an automotive battery and power supply wiring harnesses connecting the battery and a plurality of loads; a battery voltage measuring means for measuring a voltage of the battery; a resistance value calculating means for calculating resistance values between the battery and the wiring harnesses based on the measured currents of the battery current measuring means and the measured voltage of the battery voltage measuring means; a load resistance data holding means for storing and holding data on normal resistance values between the battery and the wiring harnesses as produced by each of the loads being activated; and a resistance value comparison means for determining whether the resistance values between the battery and the wiring harnesses calculated by the resistance value calculating means match the data on the normal resistance values between the battery and the wiring harnesses as produced by each of the loads being activated; wherein when the resistance value comparison means determines that the resistance values between the battery and the wiring harnesses calculated by the resistance value calculating means do not agree with the data on the normal resistance values between the battery and the wiring harnesses as produced by each of the loads being activated, it is decided that an abnormal current is flowing through some of the wiring harnesses. - View Dependent Claims (6, 7, 8)
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Specification