Capacitor discharge ignition system for internal combustion engi

Details Capacitor discharge ignition system for internal combustion engi Capacitor discharge ignition system for internal combustion engi

1981-12-14

1984-08-07

Argenbright, Tony M.

Internal-combustion engines

High tension ignition system

Using capacitive storage and discharge for spark energy

F02P 308

Patent

active

044637438

ABSTRACT:
The invention provides a modular ignition system using a separate ignition module (16) for each engine cylinder. The modules (16) can be arranged for use with engines having differing numbers of cylinders.
Each module (16) includes a main capacitor (22) to be charged by the engine's alternator (11). The main capacitor (22) is discharged through a main silicon controlled rectifier (23) into an ignition transformer (28) to provide a high voltage pulse to fire a spark plug (15). A pilot capacitor (26) is also charged by the alternator (11) to provide power to a pilot SCR (36). The pilot SCR (36) has its gate connected to a trigger winding (14) in the alternator (11) to discharge the pilot capacitor (26) into the gate of the main SCR (23) to fire the spark plug (15).
The pilot capacitor (26) is also connected to the cathode of the main SCR (23). This connection raises the voltage level of the pilot capacitor (26) during the discharge pulse to assure gate current to the main SCR (23) during the critical turn on period.
A biasing network including resistors (39, 40) and a bias capacitor (41) is provided in each of the modules (16) to maintain a substantially constant ignition angle, regardless of engine speed. The biasing networks can be interconnected to assure uniform timing for all of the spark plugs (15).

REFERENCES:
patent: 3240198 (1966-03-01), Loudon et al.
patent: 4015564 (1977-04-01), Fitzner

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