Air-fuel ratio control system
Patent
·
OSTI ID:6455115
A system for controlling air-fuel ratio for an internal combustion engine having a two-barrel carburetor. An electronic controller compares the output signal of an O/sub 2/ sensor with a reference corresponding to stoichiometry and for operating on-off electromagnetic valve(s) for controlling the air-fuel ratio to a value approximately equal to the stoichiometric air-fuel ratio. A constant signal generating circuit is selectively connected to the electronic controller. An engine operation detector is provided for detecting the transition from a heavy load condition to light load condition for producing a signal. A switching circuit operatively connects the constant signal generating circuit to the electronic controller for providing a fixed duty ratio of the valve, and renders the electronic controller nonresponsive to the output of the O/sub 2/ sensor. A switch actuating circuit is provided to actuate the switch by the output signal of the engine operation detector for a predetermined period. Thus, the on-off electromagnetic valve is operated at a small duty ratio after the heavy load condition for a predetermined period.
- Assignee:
- Fuji Jukogyo K K (Japan); Nissan Motor Co Ltd (Japan)
- Patent Number(s):
- US 4375211
- OSTI ID:
- 6455115
- Country of Publication:
- United States
- Language:
- English
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