Electricity: measuring and testing – Internal-combustion engine ignition system or device – Ignition timing
Patent
1994-11-03
1996-10-01
O'Shea, Sandra L.
Electricity: measuring and testing
Internal-combustion engine ignition system or device
Ignition timing
324402, F02P 1700, G01R 1500
Patent
active
055613799
ABSTRACT:
Ignition events in a direct ignition system are sensed by capacitively coupling positive and negative ignition voltages generated by the secondary winding of the ignition transformer. A pair of planar conductive plates disposed remote from each of the secondary winding leads capacitively couple the ignition voltages to a common node to provide an input to a processing circuit for determination of absolute engine position. The secondary coil and leads are at least partially immersed in an epoxy potting material, which forms a dielectric through which the conductive plates are capacitively coupled to the respective coil leads. The plates are electrically coupled by a conductor to form a common node, which in turn is electrically coupled to a signal processing circuit. Conveniently, the plates and conductors are formed as a single leadframe element and insert molded in the polyester material. Also, the areas of the plates are relatively sized so that the capacitively coupled voltages are balanced, and the common node voltage is substantially zero prior to spark discharge.
REFERENCES:
patent: 2517976 (1950-08-01), Clarke
patent: 2523017 (1950-09-01), Harrison
patent: 2560734 (1951-07-01), Mouzon
patent: 4648367 (1987-03-01), Gillbrand et al.
patent: 4862093 (1989-08-01), Jiewertz
patent: 5317267 (1994-05-01), Miyata et al.
patent: 5376886 (1994-12-01), Shimasaki et al.
Delco Electronics Corp.
Navarre Mark A.
O'Shea Sandra L.
Patidar Jay M.
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