Exhaust gas recirculation control device for an internal combustion engine and associated method

Patent · Tue Jun 07 04:00:00 EDT 1983

OSTI ID:5710650

Kawabata, E; Kawamoto, M; Ootaka, S; Otobe, Y; Sato, N

A method and apparatus are disclosed for exhaust gas recirculation for an internal combustion engine in which exhaust gas is recirculated through a recirculation passage connecting the exhaust passage of the engine and the intake passage of the engine. A vacuum response type recirculation control valve is disposed in the exhaust gas recirculation passage to operate in response to vacuum detected at a vacuum detection port located in the intake passage in the vicinity of a throttle valve. A vacuum tank is connected through a solenoid-actuated change-over valve to the vacuum passage interconnecting the vacuum detecting port and the recirculation control valve, the vacuum tank being in communication with the intake passage downstream from the throttle valve through a check valve. A differential pressure switch is connected between the solenoid-actuated change-over valve and a power source and is adapted to be placed in ''on'' state when the vacuum detected at the vacuum detecting port is lower than the vacuum in the vacuum tank to operate the changeover valve to connect the vacuum tank to the vacuum passage.

• Assignee: Honda Giken Kogyo K K (Japan)
• Patent Number(s): US 4386597
• OSTI ID: 5710650
• Country of Publication: United States
• Language: English

Related Subjects

33 ADVANCED PROPULSION SYSTEMS
330100 -- Internal Combustion Engines
330700* -- Advanced Propulsion Systems-- Emission Control
AUTOMOBILES
CONTROL EQUIPMENT
DESIGN
ENGINES
EQUIPMENT
EXHAUST GASES
EXHAUST RECIRCULATION SYSTEMS
EXHAUST SYSTEMS
FLOW REGULATORS
FLUIDS
GASEOUS WASTES
GASES
HEAT ENGINES
INTERNAL COMBUSTION ENGINES
POLLUTION CONTROL EQUIPMENT
VALVES
VEHICLES
WASTES