In-vehicle battery monitor
First Claim
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1. A battery monitor for monitoring a battery of an automotive vehicle, comprising:
- a voltage sensor configured to monitor a voltage across the battery;
a current sensor configured to monitor an electrical current through the battery;
an analog to digital converter configured to convert sensed current from the current sensor to a digital value;
a constant offset configured to reduce a quiescent current draw from the sensed current prior to digitizing the sensed current by the analog to digital converter; and
a processor configured to measure a parameter of the battery as a function of sensed current and sensed voltage.
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Abstract
An apparatus and a method of monitoring a battery in an automotive vehicle are provided. An output is provided which can be a relative output as a function of minimum and maximum parameters of the battery.
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Citations
10 Claims
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1. A battery monitor for monitoring a battery of an automotive vehicle, comprising:
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a voltage sensor configured to monitor a voltage across the battery; a current sensor configured to monitor an electrical current through the battery; an analog to digital converter configured to convert sensed current from the current sensor to a digital value; a constant offset configured to reduce a quiescent current draw from the sensed current prior to digitizing the sensed current by the analog to digital converter; and a processor configured to measure a parameter of the battery as a function of sensed current and sensed voltage. - View Dependent Claims (2, 3, 4, 5, 6, 7)
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8. A battery monitor for monitoring a battery of an automotive vehicle, comprising:
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a current sensor configured to monitor an electrical current through the battery; a communication link configured to couple to a data bus of the vehicle; and a processor configured to receive a signal from the data bus indicative of operation of an electrical component of the vehicle and responsively wake up from a sleep mode to monitor the electrical current through the battery using the current sensor. - View Dependent Claims (9, 10)
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Specification