Air intake side secondary air supply system for an internal combustion engine
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. The system consists of: 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 air 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 t intake air passage on downstream side of the carburetor anthe 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 providing communication between the pressure chamber of the air control valve and 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; and a pressure control means responsive to a predetermined operating condition of the engine, for supplying a pressure capable of reducing an opening degree of the air control valve into the part of second air intake side secondary air supply passage between the first open/close valve and the air supply delay means when the engine is operating under the predetermined operating condition.
- Assignee:
- Honda Giken Kogyo Kabushiki Kaisha, Tokyo
- Patent Number(s):
- US 4579099
- OSTI ID:
- 5688569
- Resource Relation:
- Patent File Date: Filed date 8 Feb 1985
- Country of Publication:
- United States
- Language:
- English
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Air intake side secondary air supply system for an internal combustion engine
Air intake side secondary air supply system for an internal combustion engine
Related Subjects
CARBURETORS
DESIGN
INTERNAL COMBUSTION ENGINES
AIR FLOW
EXHAUST GASES
FUEL-AIR RATIO
OXYGEN
PRESSURE CONTROL
PRESSURE DEPENDENCE
SIGNALS
VALVES
CONTROL
CONTROL EQUIPMENT
ELEMENTS
ENGINES
EQUIPMENT
FLOW REGULATORS
FLUID FLOW
FLUIDS
FUEL SYSTEMS
GAS FLOW
GASEOUS WASTES
GASES
HEAT ENGINES
NONMETALS
WASTES
330100* - Internal Combustion Engines