Air intake side secondary air supply system for an internal combustion engine equipped with a fuel increment control system

Patent · Tue Mar 17 04:00:00 EST 1987

OSTI ID:6652536

Kawanabe, T; Shiina, T; Asakura, M; Kimura, K

An air intake side secondary air supply system is described for an internal combustion engine having an air intake passage with a carburetor and an exhaust passage. The engine is equipped with a fuel increment control system for increasing an amount of fuel in an air/fuel mixture to be supplied to the engine depending on operating states of the engine. The air supply system comprises: an air intake side secondary air supply passage leading to the air intake passage on downstream side of the carburetor; an open/close valve disposed in the air intake side secondary air supply passage; an oxygen concentration sensor disposed in the exhaust passage and producing an output signal whose level is generally proportional to an oxygen concentration of the exhaust gas when an air/fuel ratio of the air/fuel mixture is leaner than a stoichiometric air/fuel ratio; and control means for controlling a duty ratio of opening of the open/close valve in response to a result of detection as to whether the air/fuel ratio of the air/fuel mixture is leaner or richer than the stoichiometric air/fuel ratio from the output signal of the oxygen concentration sensor. The control means is adapted to close the open/close valve without regard to an output signal level of the oxygen concentration sensor when an operation of the fuel increment control system is detected.

• Assignee: Honda Giken Kogyo Kabushiki Kaisha, Tokyo
• Patent Number(s): US 4649882
• OSTI ID: 6652536
• Country of Publication: United States
• Language: English

Related Subjects

33 ADVANCED PROPULSION SYSTEMS
330100* -- Internal Combustion Engines
AIR FLOW
CARBURETORS
CONTROL EQUIPMENT
CONTROL SYSTEMS
DISPERSIONS
ENGINES
EQUIPMENT
EXHAUST GASES
EXHAUST SYSTEMS
FLOW REGULATORS
FLUID FLOW
FLUIDS
FUEL SYSTEMS
FUEL-AIR RATIO
GAS FLOW
GASEOUS WASTES
GASES
HEAT ENGINES
INTAKE STRUCTURES
INTERNAL COMBUSTION ENGINES
MEASURING INSTRUMENTS
MECHANICAL STRUCTURES
METERS
MIXTURES
OPERATION
OXYGEN METERS
SIGNALS
STOICHIOMETRY
VALVES
WASTES