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

Patent · Tue Jul 07 04:00:00 EDT 1987

OSTI ID:6256712

Suzuki, N; Watabe, A; Yamashita, K

This patent describes an air intake side secondary air supply system for an internal combustion engine having an intake air passage with a carburetor and a a throttle valve, comprising: a first secondary air supply passage leading to the intake air passage downstream of the throttle valve; a second secondary air supply passage leading to the intake air passage downstream of the throttle valve; air/fuel ratio detection means for detecting an air/fuel ratio of a mixture supplied to the engine from a composition of an exhaust gas of the engine; an open/close valve disposed in the first secondary air supply passage which is operated to open only when the detection means detect a rich air/fuel ratio; an air control valve having a pressure chamber and disposed in the second secondary air supply passage, for varying a sectional area of a flow through the second secondary air supply passage in response to a magnitude of a pressure applied in the pressure chamber; a first control pressure source for generating a first control pressure for opening the air control valve; a second control pressure source for generating a second control pressure for closing the air control valve; engine operation detection means for detecting at least a state of engine operation in which a supply of the air intake side secondary air in response to a result of a detection operation of the air/fuel ratio detection means is to be stopped, and for generating an engine operation detecting signal upon detection of the state of engine operation; and pressure control means for gradually supplying the first control pressure to the pressure chamber.

• Assignee: Honda Giken Kogyo Kabushiki Kaisha, Tokyo
• Patent Number(s): US 4677959
• OSTI ID: 6256712
• Country of Publication: United States
• Language: English

Related Subjects

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