Ignition timing control system for an internal combustion engine

Details Ignition timing control system for an internal combustion engine Ignition timing control system for an internal combustion engine

1976-12-08

1979-06-19

Myhre, Charles J.

Internal-combustion engines

Intake manifold

Manifold tuning, balancing or pressure regulating means

123117R, F02P 510

Patent

active

041583493

ABSTRACT:
An ignition timing control system for an internal combustion engine, including a vacuum actuator connected to turn a point base about the axis of the rotary cam which operates the breaker points to advance or retard the ignition timing. The vacuum actuator employs two vacuum chambers, one used primarily to advance the timing, the other used to retard the timing. Each chamber communicates with an engine intake passage downstream from a throttle valve. Electromagnetic selector valves, one associated with each vacuum chamber, serve to connect each vacuum chamber to the engine intake passage, or alternatively to vent each vacuum chamber to atmosphere. These selector valves may be energized by a temperature switch, a velocity switch or a cruise switch. A check valve maintains vacuum intensity in the spark advance chamber when the vacuum intensity at the engine intake passage is lowered by virtue of the opening of the throttle valve.

REFERENCES:
patent: 3650253 (1972-03-01), Cooksey
patent: 3687120 (1972-08-01), Lenz
patent: 3793833 (1974-02-01), VAN Basshuysen
patent: 3923023 (1975-12-01), Ito et al.
patent: 3978831 (1976-09-01), Yoshikawa
patent: 4016844 (1977-04-01), Tanaka et al.
patent: 4022169 (1977-05-01), Tanaka et al.
patent: 4030460 (1977-06-01), Tanaka et al.
patent: 4031869 (1977-06-01), Onishi et al.
patent: 4068634 (1978-01-01), Tanaka et al.
patent: 4077373 (1978-03-01), Nakano et al.

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