Ignition system for internal-combustion engines having timing st

Details Ignition system for internal-combustion engines having timing st Ignition system for internal-combustion engines having timing st

1974-08-14

1977-04-05

Myhre, Charles J.

Internal-combustion engines

Intake manifold

Manifold tuning, balancing or pressure regulating means

123148CC, F02P 504

Patent

active

040155641

ABSTRACT:
Ignition in a six-cylinder internal combustion engine is supplied by a pair of similar alternator-driven, alternate-firing, capacitor discharge ignition systems, each discharged to the several spar k plugs of its own three cylinders by individual controlled rectifiers. A common trigger pulse generator is magnetically coupled to the engine flywheel and includes three individual trigger coils for generating properly referenced and angularly spaced pulses, each coil producing alternating positive and negative polarity pulses. A steering diode network connects one end of each triggering coil to a related controlled rectifier for an associated spark plug in one cylinder group and the opposite end of each coil to the controlled rectifier for a spark plug in the second cylinder group. Each ignition system includes a bias capacitor connected in series with the output of the three triggering coils to maintain an essentially constant ignition angle relative to trigger coil position over a wide range of engine speeds, and to establish back bias on each controlled rectifier gate-to-cathode junction during the intervals between trigger pulses. A pair of series connected resistors is connected in parallel with the bias capacitor with the center node supplying only a portion of the bias capacitor voltage to the gate to cathode junction of the related controlled rectifier in the absence of the triggering pulse. For a three cylinder engine a single one of the ignition systems is employed, and uses a wye-connection of the trigger coils in the trigger generator, the neutral wire being brought out and connected to the bias capacitor.

REFERENCES:
patent: 3518485 (1970-06-01), Leathem
patent: 3573545 (1971-04-01), Warner
patent: 3715650 (1973-02-01), Draxler
patent: 3741185 (1973-06-01), Swift et al.
patent: 3783850 (1974-01-01), Habert
patent: 3805759 (1974-04-01), Fitzner
patent: 3874349 (1975-04-01), Fitzner

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