Exhaust gas recirculation system for internal combustion engine

Patent · Tue Jan 01 04:00:00 EST 1980

OSTI ID:5349504

Kohama, T; Obayashi, H; Ozaki, T; Nohira, H

An exhaust gas recirculation system for an internal combustion engine is comprised of an exhaust gas recirculation passage for recirculating exhaust gases from an exhaust pipe into an intake pipe downstream of a throttle valve, a control valve responsive to a pressure signal for opening or closing said recirculation passage, a pressure chamber defined within the recirculation passage, a negative pressure control valve to which is transmitted a negative throttle pressure generated at a throttle port at a position upstream of the throttle valve when the latter is completely closed and which controls said negative throttle pressure in response to the load on the engine. A modulator is included wherein the pressure from the pressure chamber acts on one surface of a diaphragm while the negative output pressure from the negative pressure control valve acts on the other surface of the diaphragm so that the modulator may control the pressure signal in response to the difference between said two pressures acting on the diaphragm. The amount of exhaust gases recirculated may be made proportional to the load on the engine regardless of the variation in rotational speed of the engine.

• Assignee: Nippon Soken, Inc., Toyota Jidosha Kogyo Kabushiki Kaisha
• Patent Number(s): US 4181110
• OSTI ID: 5349504
• Country of Publication: United States
• Language: English

Related Subjects

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CHALCOGENIDES
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DESIGN
ENGINES
EQUIPMENT
EXHAUST RECIRCULATION SYSTEMS
EXHAUST SYSTEMS
INTERNAL COMBUSTION ENGINES
NITROGEN COMPOUNDS
NITROGEN OXIDES
OXIDES
OXYGEN COMPOUNDS
POLLUTION CONTROL EQUIPMENT