Air-fuel ratio control system
A system for controlling the air-fuel ratio for a carburetor for an internal combustion engine has an intake passage, an exhaust passage, a throttle valve, a detector for detecting the concentration of a constituent of the exhaust gases, an on-off type electromagnetic valve for correcting the air-fuel ratio of the air-fuel mixture supplied by an air-fuel mixture supplier and an electronic controller. The electronic controller comprises a judging circuit for comparing the output signal of the detector with a stoichiometric reference signal, for driving the on-off electromagnetic valve for controlling the air-fuel ratio to a value approximating the stoichiometric air-fuel ratio. A load sensor and an engine temperature sensor are provided respectively. A correcting circuit renders the electronic controller non-responsive to the detector, when the engine temperature sensor actuates in the cold engine operation and responsive to the output of the load sensor, whereby the on-off electromagnetic valve operates in accordance with the output of the sensor.
- Assignee:
- Fuji Jukogyo K K (Japan); Nissan Motor Co. Ltd (Japan)
- Patent Number(s):
- US 4388905
- OSTI ID:
- 5582175
- Country of Publication:
- United States
- Language:
- English
Similar Records
Air-fuel ratio control system
Air-fuel ratio control system
Related Subjects
330100* -- Internal Combustion Engines
AIR POLLUTION CONTROL
CARBURETORS
CATALYTIC CONVERTERS
CONTROL
CONTROL SYSTEMS
ENGINES
EQUIPMENT
EXHAUST GASES
FLUIDS
FUEL SYSTEMS
FUEL-AIR RATIO
GASEOUS WASTES
GASES
HEAT ENGINES
INTERNAL COMBUSTION ENGINES
POLLUTION CONTROL
POLLUTION CONTROL EQUIPMENT
WASTES