MILEAGE_COMPUTER

Published:2009/6/28 21:10:00 Author:May | From:SeekIC

Fuel consumption in miles per gallon is continuously updated on 2-dight LED display. Entire system using CMOS ICs can be built for Iess than $25 including as-flow sensor and speed sensor, sources for which are given in article along with operational details. Circuit uses rate multiplier to produce output pulse train whose frequency is proportional to product of the two inputs. Output rate is time-averaged. Speed sensor, mounted in series with speedometer cable, feeds speed data to CD4527 rate multiplier as clock input. Gas-flow sensor, mounted in series with fuel line, feeds clock input of other rate multiplier.-G. J. Summers, Miles/Gallon Measurement Made Easy with CMOS Rate Multipliers, EDN Magazine, Jan. 20, 1976,p 61-63.



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