Tachometer

Details Tachometer Tachometer

1979-07-09

1981-07-28

Wise, Edward J.

Boots, shoes, and leggings

73488, 324162, 324166, G01P 348

Patent

active

042813883

ABSTRACT:
A tachometer for monitoring several functions on an implement, such as engine, shaft and ground speeds. A microprocessor receives a-c input signals which vary in frequency as the shaft or ground speeds change. A time window synchronized with a rising edge on the desired input signal is provided during which the number of falling edges are counted. A running total weighted average of a number of successive counts is used to update a digital readout indicating speed. Each new count is compared with the previous average and, if a sudden speed change occurs, the processor shifts to a fast update mode in which the new count is used to immediately update the readout. Programming switches are provided for selecting the proper ground speed time window for a given tire size and for providing a ground speed indication in either kilometers per hour or miles per hour.

REFERENCES:
patent: 3968434 (1976-07-01), Dixon et al.
patent: 4086532 (1978-04-01), Aronson et al.
patent: 4166976 (1979-09-01), Ruhnau et al.
patent: 4167699 (1979-09-01), Baker
patent: 4179656 (1979-12-01), Wagner
patent: 4181883 (1980-01-01), Beeghly et al.

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