Internal-combustion engines – Intake manifold – Manifold tuning – balancing or pressure regulating means
Patent
1974-12-19
1976-06-29
Burns, Wendell E.
Internal-combustion engines
Intake manifold
Manifold tuning, balancing or pressure regulating means
F02P 504
Patent
active
039658740
ABSTRACT:
An ignition timing control apparatus for an internal combustion engine which includes two diaphragms, each of which is selectively connected through a change-over valve to a respective one of two vacuum ports in the passage of carburetor. One of the ports is just above the upper edge of a throttle valve in the fuel passage when the throttle valve is in its engine idling position. The other port is upstream of the one port and is adjacent the upper edge of the throttling valve when the engine is in a partly loaded condition. The change-over valve is controlled in response to the temperature of the engine cooling water. When the engine is cold-operation or warming-up, one of the diaphragms communicates with one of the vacuum ports through the change-over valve to advance the ignition timing in response to the vacuum in the passage of carburetor; and when the engine is in a condition other than cold-operation or warming-up, the other diaphragm communicates with the other vacuum port through the change-over valve to advance ignition timing in response to the vacuum, which under low and high load conditions may be approximately atmospheric pressure, in the fuel passage.
REFERENCES:
patent: 3400698 (1968-09-01), Kelly
patent: 3631845 (1972-01-01), Walker et al.
patent: 3650253 (1972-03-01), Cooksey
patent: 3727596 (1973-04-01), Panhard
patent: 3780713 (1973-12-01), Julian
Burns Wendell E.
Cranson James W.
Toyota Jidosha Kogyo Kabushiki Kaisha
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