Electricity: measuring and testing – Internal-combustion engine ignition system or device – With analysis of displayed waveform
Patent
1987-09-11
1988-11-29
Eisenzopf, Reinhard J.
Electricity: measuring and testing
Internal-combustion engine ignition system or device
With analysis of displayed waveform
324378, F02P 1700
Patent
active
047885050
ABSTRACT:
An advance reference cylinder trigger generator that provides a more effective trigger signal to synchronize the horizontal sweep of a cathode ray tube based instrument used for troubleshooting, diagnosing and servicing of spark ignition internal combustion engines. The trigger pulses, V.sub.pt, derived from the primary winding of an ignition coil are applied to a cylinder position counter (5) and, after being delayed by a delay circuit (4), to a cylinder count counter (8). When the value of cylinder position counter (5) equals or exceeds the value of cylinder count counter (8), an output from comparator (6) enables a monostable multivibrator (10) to produce an advance reference cylinder trigger V.sub.at upon receipt of the next ignition coil derived trigger pulse, V.sub.pt. Because the V.sub.pt pulses lead spark plug discharge derived pulses, the V.sub.pt pulses lead the spark plug discharge pulse associated with the V.sub.pt pulse causing the firing of the monostable multivibrator.
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Eisenzopf Reinhard J.
Pacific Northwest Electronics
Solis Jose M.
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