Detecting faults in a wiring harness
First Claim
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1. A method for detecting a possible abnormal condition of a wiring harness of a battery, comprising:
- determining a nominal resistance value of the wiring harness;
monitoring voltages of a plurality of cells of the battery using a circuit to determine a first voltage value;
monitoring a second voltage at a point in the wiring harness;
monitoring a load current through the battery;
using monitored values of the first and second voltage and load current to determine an operating resistance value of the wiring harness; and
comparing the operating resistance value of the wiring harness to the nominal resistance of the wiring harness and taking an action if the operating resistance value exceeds the nominal resistance value by more than a predetermined threshold.
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Abstract
Cell voltages within a battery pack and a voltage delivered to a load or drive system, along with a current delivered to the system, are monitored and used to detect a possible abnormal condition of a wiring harness.
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Citations
24 Claims
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1. A method for detecting a possible abnormal condition of a wiring harness of a battery, comprising:
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determining a nominal resistance value of the wiring harness; monitoring voltages of a plurality of cells of the battery using a circuit to determine a first voltage value; monitoring a second voltage at a point in the wiring harness; monitoring a load current through the battery; using monitored values of the first and second voltage and load current to determine an operating resistance value of the wiring harness; and comparing the operating resistance value of the wiring harness to the nominal resistance of the wiring harness and taking an action if the operating resistance value exceeds the nominal resistance value by more than a predetermined threshold. - View Dependent Claims (2, 3, 4, 5)
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6. A method for detecting a possible abnormal condition of a wiring harness of a battery or battery pack, comprising:
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monitoring a voltage of the battery or battery pack using a circuit; monitoring a system voltage at a wiring harness termination point; monitoring a current through the battery or battery pack; tracking data points over a period of time, each data point having said current as one coordinate and having a voltage difference between the voltage of the battery or battery pack and the system voltage as another coordinate; and detecting a possible abnormal condition of the wiring harness based on a distribution of the data points. - View Dependent Claims (7, 8, 9, 10, 11, 12)
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13. A system for detecting a possible abnormal condition of a wiring harness of a battery or battery pack, comprising:
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circuitry for monitoring a voltage of the battery or battery pack; circuitry for monitoring a system voltage at a wiring harness termination point; circuitry for monitoring a current through the battery or battery pack; and circuitry for; using monitored values to determine a resistance value of the wiring harness; and comparing the resistance value to a normal resistance value to detect a possible abnormal condition of the wiring harness. - View Dependent Claims (14, 15, 16, 17)
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18. A system for detecting a possible abnormal condition of a wiring harness of a battery or battery pack, comprising:
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circuitry for monitoring a voltage of the battery or battery pack; circuitry for monitoring a system voltage at a wiring harness termination point; circuitry for monitoring a current through the battery or battery pack; and tracking and detecting circuitry for; tracking data points over a period of time, each data point having said current as one coordinate and having a voltage difference between the voltage of the battery or battery pack and the system voltage as another coordinate; and detecting a possible abnormal condition of the wiring harness based on a distribution of the data points. - View Dependent Claims (19, 20, 21, 22, 23, 24)
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Specification