Air-fuel ratio control system

Patent · Tue Dec 21 04:00:00 EST 1982

OSTI ID:6387773

Matsuoka, T

An air-fuel ratio control system for an internal combustion engine including an automobile carburetor having a fuel passage for forming a combustible air-fuel mixture by mixing fuel fed through the fuel passage with air drawn from the atmosphere, comprises a catalytic converter for substantially purifying exhaust gases emitted from the engine, a composition sensor for sensing the concentration of a component of the exhaust gases as a function of the air-fuel mixing ratio of the combustible mixture burned in the engine, a first air bleed passage leading from the atmosphere to the fuel passage, a first actuator for controlling the flow of air through the first air bleed passage, an air-fuel ratio control for controlling the duty ratio of the first actuator in dependence on the output signal fed thereto from the composition sensor, a second air bleed passage leading from the atmosphere to the fuel passage, a second actuator for controlling the flow of air through the second air bleed passage, and an air bleed control for controlling the second actuator to permit the flow of the air to the fuel passage through the second air bleed passage together with the air flowing through the first air bleed passage only when the duty ratio of the first actuator attains a predetermined value.

• Assignee: Toyo Kogyo Co Ltd (Japan)
• Patent Number(s): US 4364357
• OSTI ID: 6387773
• Country of Publication: United States
• Language: English

Related Subjects

33 ADVANCED PROPULSION SYSTEMS
330101* -- Internal Combustion Engines-- Spark-Ignition
AIR FLOW
AUTOMOBILES
CARBURETORS
CATALYTIC CONVERTERS
CONTROL SYSTEMS
ENGINES
EQUIPMENT
EXHAUST GASES
FLUID FLOW
FLUIDS
FUEL SYSTEMS
FUEL-AIR RATIO
GAS FLOW
GASEOUS WASTES
GASES
HEAT ENGINES
INTERNAL COMBUSTION ENGINES
POLLUTION CONTROL EQUIPMENT
VEHICLES
WASTES