Air-fuel ratio control system for an internal combustion engine with a three way catalytic converter

Patent · Tue Apr 29 00:00:00 EDT 1986

OSTI ID:5731685

Fujimura, A; Sato, Y

An air-fuel ratio control system is described for an internal combustion engine having at least one of a main fuel passage and a slow fuel passage in a fuel supply system thereof, the air-fuel ratio control system being adapted for performing a feedback control of air-fuel ratio according to a detected oxygen concentration of an exhaust gas of the engine, and comprising: an auxiliary fuel supply means for supplying an auxiliary fuel to the engine through a fuel nozzle opening at a venturi part of a carburetor of the engine; an intake air temperature sensing means for sensing temperature of intake air introduced to the engine; and a control means for operating/stopping the feedback control of air-fuel ratio in accordance with the temperature of intake air sensed by the intake air temperature sensing means, the control means comprising a single control valve being adapted to stop the feedback control of air-fuel ratio and activate the auxiliary fuel supply means and to stop a supply of air into at least one of the main fuel passage and slow fuel passage, for enriching the air-fuel ratio when the temperature of intake air is below a predetermined level.

• Assignee: Honda Giken Kogyo Kabushiki Kaisha, Tokyo
• Patent Number(s): US 4584979
• OSTI ID: 5731685
• Resource Relation: Patent File Date: Filed date 28 Aug 1984
• Country of Publication: United States
• Language: English

Related Subjects

33 ADVANCED PROPULSION SYSTEMS
CATALYTIC CONVERTERS
DESIGN
FUEL INJECTION SYSTEMS
INTERNAL COMBUSTION ENGINES
FUEL-AIR RATIO
AIR FLOW
CARBURETORS
COMPUTERIZED CONTROL SYSTEMS
EXHAUST GASES
FEEDBACK
NOZZLES
OXYGEN
QUANTITY RATIO
TEMPERATURE MEASUREMENT
THERMOMETERS
VALVES
CONTROL EQUIPMENT
CONTROL SYSTEMS
ELEMENTS
ENGINES
EQUIPMENT
FLOW REGULATORS
FLUID FLOW
FLUIDS
FUEL SYSTEMS
GAS FLOW
GASEOUS WASTES
GASES
HEAT ENGINES
MEASURING INSTRUMENTS
NONMETALS
POLLUTION CONTROL EQUIPMENT
WASTES
330100* - Internal Combustion Engines
330700 - Advanced Propulsion Systems- Emission Control