In operation, no correction is applied for retarding or advancing the spark timing so long as the engine temperature remains below a predetermined value, at which time the temperature sensitive valve 26 remains closed. A movable member 24 actuated by the diaphragm 23 turns the point base 25 to advance or retard the spark timing of the engine. These chambers are separated by a vacuum response member comprising a flexible diaphragm 23. The first conduit 18 is connected to a spark advance chamber 21, and the second conduit 19 is connected to a spark retard chamber 22. In the position shown in the drawing, the second conduit 19 is connected to the vacuum line 13, and when the solenoid is actuated, the first conduit 18 is connected to the vacuum line 13. The three- way valve 15 is normally biased to the position shown in the drawing, but may be moved to a second position upon energizing of a solenoid 16 through an electrical circuit 17. A vacuum line 13 communicates with the intake passage at a location downstream from the throttle valve 12 and is connected at 14 to a three-way valve generally designated 15. Referring to the drawing, an internal combustion engine generally designated 10 is provided with an intake passage 11 for an air-fuel mixture, and a throttle valve 12 is positioned in this intake passage. F02P5/106- Combustion-air pressure devices combined with other specific conditions.combustion-air pressure dependent on the combustion-air pressure in engine F02P5/103- Advancing or retarding ignition Control therefor automatically, as a function of the working conditions of the engine or vehicle or of the atmospheric conditions using mechanical means dependent on fluid pressure in engine, e.g.F02P5/10- Advancing or retarding ignition Control therefor automatically, as a function of the working conditions of the engine or vehicle or of the atmospheric conditions using mechanical means dependent on fluid pressure in engine, e.g.F02P5/05- Advancing or retarding ignition Control therefor automatically, as a function of the working conditions of the engine or vehicle or of the atmospheric conditions using mechanical means. ![]()
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