Tachometer

Details Tachometer Tachometer

G - Physics

01

P

73/168, 73/62

G01P 3/481 (2006.01) G01P 3/489 (2006.01)

Patent

CA 1127422

TACHOMETER Abstract of the Disclosure A tachometer for monitoring several functions on an imple- ment, 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 syncronized 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.

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