Tachometer, RPM processor, and method

Details Tachometer, RPM processor, and method Tachometer, RPM processor, and method

1986-03-21

1989-03-07

Lall, Parshotam S.

Boots, shoes, and leggings

123351, 324164, 324179, G06F 1520, G01P 360, G01P 354

Patent

active

048112550

ABSTRACT:
The invention comprises a tachometer for aircraft for determining engine operating parameters from magneto signals from right and left magnetos. A signal conditioning circuit receives ignition signals from at least one magneto and modifies the ignition signals to provide a right and left train of input pulses for the microprocessor. The microprocessor follows a stored program to develop filtered quantitites depicting right rpm, and left rpm for respective right and left engines, or right and left magnetos of a single engine. The maximum rpm achieved during operation is also stored, along with the difference between the right and left rpms, the change in rpm over a period of time, and average rpm of two engines. A mode switch selects from right rpm, left rpm, maximum rpm, difference rpm, change in rpm over time, and average rpm for display on the display means. A method for calculating highly accurate engine RPM is disclosed. The displayed information is used by the aircraft mechanic and/or pilot to diagnose aircraft engine and instrument performance.

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patent: 4578755 (1986-03-01), Quinn et al.
patent: 4594978 (1986-06-01), Kanno
"Flying" by Barry Schiff; Golden Press, New York, Western Publishing Company, Inc. 1971; pp. 1-3 & 27-28.
"Seneca Information Manual" by Piper: Publications Department Piper Aircraft Corporation. 4/71, Revised 11/71. pp. 1-4 & 2-13.

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