Electricity: measuring and testing – Measuring – testing – or sensing electricity – per se – Frequency of cyclic current or voltage
Patent
1976-06-14
1977-10-04
Chatmon, Jr., Saxfield
Electricity: measuring and testing
Measuring, testing, or sensing electricity, per se
Frequency of cyclic current or voltage
324 15, 324 16T, 73119A, G01R 1342, G01R 2300, G01R 2900
Patent
active
040526631
ABSTRACT:
A fuel injected engine timing instrument measures timing advance of fuel injection onset as referenced to a predetermined cylinder top-dead-center to provide an analog output signal proportional to fuel injection advance for the engine. This output signal is obtained by measuring the time required for an engine flywheel to move a predetermined distance which movement is sensed by a transducer responsive to timing indicia on the flywheel. An output signal from the transducer is applied to a gating circuit in combination with a signal derived from a transducer detecting the onset of fuel injection into the reference cylinder of the engine. The gating circuit is enabled by these two signals to control the duration of application of output signals from a fixed frequency oscillator to a counter. The output signal from the transducer sensing the movement of a flywheel is also used to control a second gating circuit arranged to apply the output signals from the oscillator to a second counter. The count signals from the first and second counters are compared by a ratio computing circuit to produce an analog output signal representative of the timing advance in degrees of the fuel injection onset before top-dead-center.
REFERENCES:
patent: 3454871 (1969-07-01), Nolting
patent: 3511088 (1970-05-01), Weaver
patent: 3731527 (1973-05-01), Weaver
patent: 3753108 (1973-08-01), Eberle
patent: 3767902 (1973-10-01), Estes et al.
patent: 3916683 (1975-11-01), Felger et al.
Burton Lockwood D.
Chatmon, Jr. Saxfield
Halista Mitchell J.
Honeywell Inc.
Marhoefer Laurence J.
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