Internal-combustion engines – High tension ignition system – Having dwell control
Patent
1980-01-04
1981-03-03
Cox, Ronald B.
Internal-combustion engines
High tension ignition system
Having dwell control
123611, F02P 100
Patent
active
042534437
ABSTRACT:
To permit use of shaft position transducers which provide needle pulses at predetermined angular positions of the crankshaft of an engine, such as Wiegand-type, and still enable generation of a counted dwell time even under transient conditions, or under low-speed conditions, the output from the Wiegand transducer is connected to a logic circuit which, under normal operating conditions, by use of a counter counts a predetermined time interval after opening of a switch in series with the ignition coil to determine the dwell period or initiation of current flow for a subsequent ignition event by resetting the counter with a reverse polarity subsequent pulse, thereby passing, upon reset, a predetermined count state which, similar to the normal counting of the count state, initiates closing of the switch. Thus, even though the normal counting time has not yet been reached, the reset operation of the counter will trigger closing of the switch and hence sufficient current flow through the ignition coil to store the appropriate electromagnetic energy therein for a reliable spark at the spark plug.
REFERENCES:
patent: 4009378 (1977-02-01), Sakamoto
patent: 4121556 (1978-10-01), Bigliani
patent: 4133323 (1979-01-01), Adler
Jundt Werner
Ruf Walter
Seeger Karl
Sohner Gerhard
Cox Ronald B.
Robert & Bosch GmbH
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