Ignition timing control device for an internal combustion engine

Internal-combustion engines – Intake manifold – Manifold tuning – balancing or pressure regulating means

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F02P 504

Patent

active

040773736

ABSTRACT:
A spark-advance mechanism for an internal combustion engine is operated by vacuum pressure in the engine intake manifold. A conduit connecting the spark-advance mechanism to the intake manifold includes a solenoid operated valve which is normally open, and which is closed by either of two switches connected in parallel. One of the switches is closed when the engine temperature is low, and the other is closed when the engine RPM is high. When the solenoid valve is energized by either or both switches to close the conduit, atmospheric air is bled through an orifice to cause slow advance of the spark timing.

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patent: 3665904 (1972-05-01), Goodwillie
patent: 3687120 (1972-08-01), Lenz
patent: 3783846 (1974-01-01), Barnhart et al.
patent: 3895616 (1975-07-01), Steinke
patent: 3923023 (1975-12-01), Ito et al.
patent: 3964258 (1976-06-01), Romano et al.

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