Exhaust gas recirculation system for internal combustion engine

Patent · Tue Aug 11 04:00:00 EDT 1981

OSTI ID:6027678

Ikuta, Y; Matsuo, M

An exhaust gas recirculation system for an internal combustion engine is disclosed that has an exhaust gas recirculation passage, a constant pressure chamber disposed at an intermediate portion of the exhaust gas recirculation passage, a pressure regulating valve operative in response to the exhaust gas pressure in the constant pressure chamber, a first flow-rate control valve actuated by vacuum regulated by the pressure regulating valve and adapted to open and close the exhaust gas recirculation passage and a second flow-rate control valve adapted to change the cross-sectional area of the exhaust gas recirculation passage in response to the level of load applied to the internal combustion engine. The exhaust gas recirculation system further has an atmospheric pressure introduction valve communicated with a vacuum passage through which the first flow-rate control valve is communicated with the pressure regulating valve and adapted to selectively introduce the atmospheric pressure into the vacuum passage in accordance with the level of the vacuum established in the intake manifold of the engine.

• Assignee: Toyota Jidosha Kogyo K K (Japan)
• Patent Number(s): US 4282847
• OSTI ID: 6027678
• Country of Publication: United States
• Language: English

Related Subjects

33 ADVANCED PROPULSION SYSTEMS
330100* -- Internal Combustion Engines
330700 -- Advanced Propulsion Systems-- Emission Control
CHALCOGENIDES
CONTROL EQUIPMENT
DESIGN
ENGINES
EQUIPMENT
EXHAUST RECIRCULATION SYSTEMS
EXHAUST SYSTEMS
FILTERS
FLOW RATE
FLOW REGULATORS
FUEL ECONOMY
HEAT ENGINES
INTERNAL COMBUSTION ENGINES
NITROGEN COMPOUNDS
NITROGEN OXIDES
OXIDES
OXYGEN COMPOUNDS
POLLUTION CONTROL EQUIPMENT
VALVES