Electricity: measuring and testing – Measuring – testing – or sensing electricity – per se – Frequency of cyclic current or voltage
Patent
1977-01-26
1978-01-24
Kominski, John
Electricity: measuring and testing
Measuring, testing, or sensing electricity, per se
Frequency of cyclic current or voltage
324 83D, F02P 1700
Patent
active
040706133
ABSTRACT:
Apparatus for measuring the ignition timing of a multi-cylinder internal combustion engine of the type having a pulse generator for indicating when the flywheel is in a predetermined position with respect to top dead center and in which an input signal is obtained from one particular spark plug and employed to initiate a counting operation employing a series of pulses which have a definite frequency relationship to the speed of the engine. The counting operation is started at the time that the pulse from the selected plug is received and is terminated when the reference signal is received from the pulse generator. Provision is made for compensating for different reference angles between the top dead center position and the position at which the pulse generator produces a pulse. This is done by presetting a counter in accordance with the reference angle.
The apparatus can also be used as a tachometer. A digital display is employed and when the apparatus is used as a tachometer, all four of the digital display units are employed. When the apparatus is used to measure advance timing, only two of the display units are used and the third is used to display a minus sign when the ignition is retarded.
REFERENCES:
patent: 3753082 (1973-08-01), Crawford et al.
patent: 3768004 (1973-10-01), Abnett et al.
patent: 3939397 (1976-02-01), Maisonville
Applied Power Inc.
Kominski John
Lange Frederick E.
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