In-vehicle battery monitor
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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.
115 Citations
42 Claims
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1-17. -17. (canceled).
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18. A battery monitor for use in 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;
a processor configured to measure a parameter of the battery with the current sensor and the voltage sensor, compare the measured parameter with a historical parameter and identify replacement of the battery based upon the comparison. - View Dependent Claims (19, 20, 21, 22, 23, 24, 25, 26, 27, 28, 29, 30, 31, 32)
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33. 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 (34, 35, 36, 37, 38, 39)
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40. 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 (41, 42)
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Specification