Digital system controller with programmable ranges for analog speedometer and tachometer gauges
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United States of America Patent
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-
Oct 18, 1994
Grant Date -
N/A
app pub date -
Jan 7, 1993
filing date -
Jan 7, 1993
priority date (Note) -
Expired
status (Latency Note)
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Abstract
A method and apparatus for improving the speed of response and display accuracy of a periodic input signal, of the type having a widely variable frequency, on an analog gauge have a meter deflection representative of the frequency of the input signal. Frequency scaling means are provided for multiplying the frequency of the input signal by a first constant to generate an intermediate signal. Counting means are coupled to the frequency scaling means for counting the frequency of the intermediate signal for a time period which is directly proportional to the maximum sweep deflection arc of the gauge times a second constant, and is inversely proportional to the maximum expected frequency of the input signal. Meter driver means coupled to the counting means are provided for deflecting the meter proportional to the counted intermediate signal frequency.
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