Internal-combustion engines – Intake manifold – Manifold tuning – balancing or pressure regulating means
Patent
1975-02-18
1976-12-21
Burns, Wendell E.
Internal-combustion engines
Intake manifold
Manifold tuning, balancing or pressure regulating means
F02P 506
Patent
active
039981924
ABSTRACT:
An ignition timing change-over device for an internal combustion engine comprising a vacuum advancer for causing rotation of the breaker plate of the contact breaker toward an ignition timing advancing direction, a vacuum retarder for causing rotation of the breaker plate toward an ignition timing retarding direction, a first valve unit connected to the vacuum advancer and vacuum retarder, and a second valve unit connected to the vacuum retarder and the first valve unit. The first valve unit is used for supplying the suction vacuum into the vacuum advancer when the temperature of the engine is lower than a predetermined value, supplying the suction vacuum into the vacuum retarder when the engine temperature is higher than the predetermined value, and supplying the suction vacuum into the vacuum advancer when the engine temperature is higher than the predetermined value and the vacuum in the intake manifold is higher than a predetermined value, while the second valve unit acts to permit communication between the vacuum retarder and the atmosphere when the vacuum in the intake manifold is higher than the predetermined value and to permit communication between the vacuum retarder and the first valve unit when the vacuum in the intake manifold is lower than the predetermined value, so that the ignition timing can be changed depending on variations of the two variables, that is, the engine temperature and the intake manifold vacuum.
REFERENCES:
patent: 3680533 (1972-08-01), Soberski
patent: 3730154 (1973-05-01), Vartanlan
patent: 3812832 (1974-05-01), Scott
patent: 3841551 (1974-10-01), Ota
Burns Wendell E.
Reynolds David D.
Toyota Jidosha Kogyo Kabushiki Kaisha
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