Control device for a vacuum advancer
AssigneeToyota Jidosha Kogyo Kabushiki Kaisha
InventorEiji Yoshikawa
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Abstract
A control device for a vacuum advancer of the type for actuating the vacuum advancer in the directions of advancing and delaying the ignition timing under the control of a discriminating means to evaluate the operating condition of the engine. The vacuum advancer is adapted to be selectively driven in either of said two directions by the difference between a fraction of the vacuum in the inlet tube of the carbureter or the inlet manifold and either the total vacuum in the inlet tube or manifold or the atmospheric pressure by employing only one switch-over valve.
Claims5
In an internal combustion engine having an inlet tube and a vacuum advancer, said vacuum advancer including two diaphragm chambers defined at opposite sides of a diaphragm and adapted to advance the ignition timing of said engine when said diaphragm is biased in one direction and to delay said ignition timing when said diaphragm is biased in the other direction, the improvement comprising, a control device for said vacuum advancer, said control device comprising switch-over means for selectively introducing either the vacuum in the inlet tube or manifold or atmospheric pressure into one of said diaphragm chambers, and a fraction generating means for constantly generating substantially a one-half fraction of the intake vacuum throughout substantially the entire intake vacuum level, said fraction being constantly introduced into said other of said diaphragm chambers.
Dependencies are inferred from the claim text.