Electricity: measuring and testing – Internal-combustion engine ignition system or device – In situ testing of spark plug
Patent
1984-10-03
1986-08-26
Eisenzopf, Reinhard J.
Electricity: measuring and testing
Internal-combustion engine ignition system or device
In situ testing of spark plug
324384, 324378, 123638, 73116, F02P 1700, F02P 1508
Patent
active
046085360
ABSTRACT:
The Ignition Performance Measuring Circut is intended for use with dual ignition systems, such as the dual-magneto ignition systems used on light aircraft. The circuit has a first and second channel. The first channel is dedicated to measuring the relative peak amplitude of amplitude difference signals, i.e. the algebraic difference between concurrent left and right conditioned ignition signals. Signal conditioning is performed by an input attenuator and a difference amplifier. The circuit operates without benefit of a positive synchronization. To any particular cylinder's ignition firing signals. The pilot of an aircraft using the invention circuit will be alerted to the presence of a degraded firing signal but will not be advised as to which cylinder or spark plug is contributing to the failure indication. The circuit has a peak detection network for selecting the largest amplitude difference signal from each series of firing signals. The second channel senses the time difference between concurrent left and right firing signals for the purpose of detecting timing errors between the left and right ignition systems. The circuit is intended to couple to the ignition system at the ignition selector switch thereby eliminating the necessity for disturbing existing shielded or armored sealed existing ignition system components.
REFERENCES:
patent: 3409824 (1968-11-01), Makuh
patent: 3961240 (1976-06-01), Pohl
patent: 4417467 (1983-11-01), Higgs
Gustafson John W.
Jacobs Aaron R.
Eisenzopf Reinhard J.
Kirk James F.
Solis Jose M.
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