Device outage detector including a current detector and a voltage detector
First Claim
1. A device outage detector, comprising:
- a microcontroller;
a plurality of shunt resistors, each connected to at least one of a plurality of vehicle elements;
a current sensor configured to measure a plurality of instantaneous currents passing through the plurality of shunt resistors, respectively, and configured to generate a plurality of instantaneous current values; and
a voltage sensor, separate from the current sensor, configured to measure a plurality of instantaneous voltages across the plurality of shunt resistors, respectively, and configured to generate a plurality of instantaneous voltage values different from the plurality of instantaneous current values,whereinthe microcontroller is configured to issue a warning for a given shunt resistor if its corresponding instantaneous current is below a first threshold value and its instantaneous voltage is zero, andthe microcontroller is configured to issue a warning for the given shunt resistor if its corresponding instantaneous current is above a second threshold value.
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Accused Products
Abstract
A device outage detector, comprising: a microcontroller; a plurality of shunt resistors, each connected to at least one of a plurality of vehicle elements; a current sensor configured to measure a plurality of instantaneous currents passing through the plurality of shunt resistors, respectively; and a voltage sensor configured to measure a plurality of instantaneous voltages across the plurality of shunt resistors, respectively, wherein the microcontroller is configured to issue a warning for a given shunt resistor if its corresponding instantaneous current is below the first threshold value and its instantaneous voltage is zero, or if its corresponding instantaneous current is above a second threshold value.
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Citations
18 Claims
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1. A device outage detector, comprising:
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a microcontroller; a plurality of shunt resistors, each connected to at least one of a plurality of vehicle elements; a current sensor configured to measure a plurality of instantaneous currents passing through the plurality of shunt resistors, respectively, and configured to generate a plurality of instantaneous current values; and a voltage sensor, separate from the current sensor, configured to measure a plurality of instantaneous voltages across the plurality of shunt resistors, respectively, and configured to generate a plurality of instantaneous voltage values different from the plurality of instantaneous current values, wherein the microcontroller is configured to issue a warning for a given shunt resistor if its corresponding instantaneous current is below a first threshold value and its instantaneous voltage is zero, and the microcontroller is configured to issue a warning for the given shunt resistor if its corresponding instantaneous current is above a second threshold value. - View Dependent Claims (2, 3, 4, 5)
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6. A device outage detector, comprising:
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a microcontroller; a plurality of shunt resistors, each connected to at least one of a plurality of vehicle elements; a current sensor configured to measure a plurality of instantaneous currents passing through the plurality of shunt resistors, respectively; and a voltage sensor configured to measure a plurality of instantaneous voltages across the plurality of shunt resistors, respectively, wherein the microcontroller is configured to issue a warning for a given shunt resistor if its corresponding instantaneous current is below a first threshold value and its instantaneous voltage is zero, the microcontroller is configured to issue a warning for the given shunt resistor if its corresponding instantaneous current is above a second threshold value, and the first threshold value is equal to a moving average current minus an adjustment value. - View Dependent Claims (7, 8, 9)
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10. A method of operating a device outage detector, comprising:
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obtaining a plurality of initial current values associated with each of i shunt resistors; determining i moving average current values associated with the i shunt resistors, respectively, based on the plurality of initial current values; for each of the i shunt resistors, obtaining an ith instantaneous current value associated with an ith shunt resistor after determining the moving average current value; obtaining an ith instantaneous voltage value associated with the ith shunt resistor after determining the moving average current value; determining whether the ith instantaneous current value is below an ith lower current threshold; determining whether the instantaneous current value is above an ith upper current threshold when the ith instantaneous current value is not below the ith lower current threshold; determining whether the ith instantaneous voltage is zero when the ith instantaneous current value is below the ith lower current threshold; reporting a short circuit on a branch associated with the ith shunt resistor when the ith instantaneous current is above the ith upper current threshold; reporting an open circuit on the branch associated with the ith shunt resistor when the ith instantaneous voltage is zero; and updating the ith moving average current value based on the ith instantaneous current value and the ith moving average current value, wherein i is an integer greater than one. - View Dependent Claims (11, 12, 13, 14, 15, 16, 17, 18)
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Specification