Measurement of current in a vehicle using battery cable as a shunt
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United States of America Patent
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-
Sep 4, 2001
Grant Date -
N/A
app pub date -
Oct 8, 1999
filing date -
Oct 8, 1999
priority date (Note) -
In Force
status (Latency Note)
Importance
Abstract
Current flowing into and out of a battery installed in a vehicle (V) with the required cable between one of the battery terminals and a reference point on the vehicle is determined by measuring the voltage across the cable and computing the current from the digital value of the measured current. The resistance value of the cable can be known in which case the current is computed using Ohms law and a differential current sensor can be used to respond to the voltage measured across the cable to accommodate for different ranges of current. In an embodiment where the cable resistance is unknown, a reference current source produces a known voltage that is used to set the input value to an amplifier of fixed gain for the voltage measured across the cable by controlling the output of a potentiometer so that the amplifier output voltage can be set to match the reference current generator output voltage, thereby establishing the voltage output of the amplifier as a measurement of the current flow in the cable.
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