Air intake side secondary air supply system for an internal combustion engine

Patent · Tue Aug 12 00:00:00 EDT 1986

OSTI ID:5339650

Isobe, Y; Iwasaki, H

An air intake side secondary air supply system is described for an internal combustion engine having a carburetor and intake air passage with a throttle valve, comprising: an air-fuel ratio detection means for detecting an air-fuel ratio from an oxygen concentration of an exhaust gas of the engine and producing an air-fuel ratio signal; a first air intake side secondary air supply passage leading to the intake air passage on downstream side of the carburetor and the throttle valve; an air control valve disposed in the first air intake side secondary air supply passage and adapted to vary a sectional area of the first air intake side secondary air supply passage in accordance with a magnitude of a pressure supplied to a pressure chamber thereof; a second air intake side secondary air supply passage leading to the intake air passage on downstream side of the carburetor and the throttle valve; a first open/close valve disposed in the second air intake side secondary air supply passage and opening and closing same in accordance with a content of the air-fuel ratio signal; a first air supply delay means disposed in the second air intake side secondary air supply passage, on upstream side of the first open/close valve; a pressure supply passage for communicating the pressure chamber of the air control valve with a part of the second air intake side secondary air supply passage between the first open/close valve and the first air supply delay means; a second air supply delay means disposed in the pressure supply passage; and a pressure control means for supplying an air pressure for reducing an opening degree of the air control valve into the pressure supply passage between the second pressure supply delay means and the pressure chamber of the air control valve, during a predetermined operating condition of the engine.

• Assignee: Honda Giken Kogyo Kabushiki Kaisha, Tokyo
• Patent Number(s): US 4604984
• OSTI ID: 5339650
• Resource Relation: Patent File Date: Filed date 08 May 1985
• Country of Publication: United States
• Language: English

Related Subjects

33 ADVANCED PROPULSION SYSTEMS
INTERNAL COMBUSTION ENGINES
AIR FLOW
CARBURETORS
INTAKE STRUCTURES
EXHAUST GASES
FUEL-AIR RATIO
OXYGEN
PRESSURE CONTROL
SIGNALS
VALVES
CONTROL
CONTROL EQUIPMENT
ELEMENTS
ENGINES
EQUIPMENT
FLOW REGULATORS
FLUID FLOW
FLUIDS
FUEL SYSTEMS
GAS FLOW
GASEOUS WASTES
GASES
HEAT ENGINES
MECHANICAL STRUCTURES
NONMETALS
WASTES
330100* - Internal Combustion Engines