Apparatus for cleaning exhaust gas for an internal combustion engine

Patent · Tue Dec 11 04:00:00 EST 1979

OSTI ID:5490172

Wakita, N; Hashimoto, E

Disclosed herein is an apparatus for cleaning the exhaust gas of an internal combustion engine, which apparatus includes an exhaust gas recirculation system provided with a back-pressure control mechanism for maintaining a predetermined constant pressure of recirculated exhaust gas in a recirculation passageway, and an air injection system connecting an air pump with an exhaust system of the engine. An air-flow control valve has two vacuum chambers arranged between the air injection system and the exhaust gas recirculation system for controlling, in two stages, the amount of air diverted from the air injection system to the recirculation passageway. One of the chambers is directly connected to a vacuum source in the intake system of the engine while the other is connected, via a vacuum delay unit, to the vacuum source.

• Assignee: Toyota Jidosha Kogyo Kabushiki Kaisha
• Patent Number(s): US 4177641
• OSTI ID: 5490172
• Country of Publication: United States
• Language: English

Related Subjects

33 ADVANCED PROPULSION SYSTEMS
330701* -- Emission Control-- Nitrogen Oxides
AIR POLLUTION CONTROL
CHALCOGENIDES
DESIGN
ENGINES
EQUIPMENT
EXHAUST GASES
EXHAUST RECIRCULATION SYSTEMS
EXHAUST SYSTEMS
GASEOUS WASTES
INTERNAL COMBUSTION ENGINES
NITROGEN COMPOUNDS
NITROGEN OXIDES
OXIDES
OXYGEN COMPOUNDS
POLLUTION CONTROL
POLLUTION CONTROL EQUIPMENT
WASTES