Internal-combustion engines – Igniters – Incandescent
Patent
1978-01-09
1980-04-08
Lazarus, Ronald H.
Internal-combustion engines
Igniters
Incandescent
315209T, F02P 304
Patent
active
041967119
ABSTRACT:
To permit use of integrated circuits in solid-state ignition control systems in which the current through the primary of the ignition is pulsed when a predetermined level is reached, a threshold switch which has switching hysteresis is connected to control conduction of an auxiliary semiconductor connected in parallel with the ignition coil, to control the auxiliary semiconductor to become conductive when the current through the coil rises above a predetermined first threshold level to thereby shunt the primary thereof or to block the auxiliary semiconductor switch when the current through the coil drops below a predetermined second threshold level and thereby removes the shunt from the primary of the ignition coil and permits current flow from a power source thereto to ensure, reliably, alternate opening and closing of the main controlled switch, typically a transistor, in series with the coil and the auxiliary controlled switch.
REFERENCES:
patent: 3324351 (1967-06-01), Pahl, Jr.
patent: 3575154 (1971-04-01), Taylor
patent: 3709206 (1973-01-01), Myers
patent: 4020816 (1977-05-01), Chateau
patent: 4084567 (1978-04-01), Hachiga
patent: 4105006 (1978-08-01), Jundt et al.
patent: 4114581 (1978-09-01), Wurst
Dolinar Andrew M.
Lazarus Ronald H.
Robert & Bosch GmbH
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