Method and apparatus for data communication
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United States of America Patent
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-
Apr 28, 1998
Issued Date -
N/A
app pub date -
Jun 4, 1996
filing date -
Dec 12, 1994
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
A voltage regulation system for an automobile comprises a voltage regulator and a powertrain control module. The powertrain control module has a quartz crystal as its time base, while the voltage regulator has a less-expensive, though more environmentally robust resistive-capacitive (RC) oscillator. The voltage regulator and powertrain control module communicate between one another using pulse-width modulation. Drift in the frequency of the RC oscillator in the voltage regulator is recognized through the powertrain control module's measurement of the frequency of the signal sent by the voltage regulator. The powertrain control module adjusts the frequency of the signal it sends to the voltage regulator, assuring that the drift in frequency of the RC oscillator does not inhibit accurate PWM communications between the two devices.
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