Internal-combustion engines – Intake manifold – Manifold tuning – balancing or pressure regulating means
Patent
1978-03-20
1980-06-24
Myhre, Charles J.
Internal-combustion engines
Intake manifold
Manifold tuning, balancing or pressure regulating means
123148E, 123117D, F02P 504
Patent
active
042089921
ABSTRACT:
A distributorless electronic ignition system for replacing the entire traditional spark distributor system in an internal combustion engine. First timing pulses, generated in a first pulse generator by electromagnetically sensing the magnetic discontinuities of one or more lobed discs fixed to the engine crankshaft, are coupled to a second pulse generator which generates a second timing signal. The second timing signals are coupled to an electronic shaft means which generates a shaft position signal and shaft rate signal which are added to form a composite signal whose amplitude increases as the speed of the engine increases. An advance signal pulse is initiated each time the composite signal amplitude increases to a value equal to a reference voltage defining the basic idle timing. The pulse width of each advance signal pulse is then modified in a pulse width control circuit to form a spark enable signal having a time duration equal to the time duration desired for the sparks. The spark enable signal as well as the first timing signal are combined in an electronic distributor to sequentially generate ignition spark signals on a plurality of leads, each coupled to spark plugs positioned in a pair of cylinders having the same relative position with one being in the combustion phase and the other being in the exhaust phase of the combustion cycle. Spark modulation to provide multiple ignition sparks during each spark enable pulse is also provided by ANDing the spark enable pulse with a high frequency pulse signal from a signal generator.
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Myhre Charles J.
Nelli Raymond A.
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