JPS54106734A - Intake controller for internal combustion engine - Google Patents

Abstract

PURPOSE: To prevent the thickening of the mixture and the deterioration in the running performance of the engine, by closing a carbureter rich valve and an exhaust return valve when a choke valve is operated at the time of starting under the cold atmosphere.

CONSTITUTION: The carbureter rich valve 10 made of a valve element 16 fixed on a diaphragm 15 mixes fuel introduced from an inlet port 14 with air supplied from an air bleeder 13. The mixture is introduced into an litake pipe 3 through a passage 9. The intake pipe 3 is provided with the exhaust return valve 24 made of a valve element 28 fixed on a diaphragm 27. The exhaust return valve 24 regulates the quantity of returned exhaust gas. Negative pressure chambers 17, 29 of the valves 10, 24 are connected to a cleaner 2 through a two-way solenoid valve 31 and a switch 37, which is turned on when the choke valve 5 is closed. Only in the starting under the cold atmosphere, the atmosphere is introduced into said negative pressure chambers 17, 29 to keep the valves 10, 24 from operating. After the engine is warmed up, the solenoid valve 31 is closed and a water temperature sensitive valve 20 is opened to transmit negative pressure from the intake pipe to the negative pressure chambers 17, 29.

COPYRIGHT: (C)1979,JPO&Japio