Exhaust gas recirculation system for internal combustion engine

Patent · Tue Jan 01 00:00:00 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
• Resource Relation: Patent Priority Date: Priority date 26 May 1977, Japan
• Country of Publication: United States
• Language: English

Related Subjects

33 ADVANCED PROPULSION SYSTEMS
EXHAUST RECIRCULATION SYSTEMS
DESIGN
INTERNAL COMBUSTION ENGINES
CONTROL EQUIPMENT
NITROGEN OXIDES
CHALCOGENIDES
ENGINES
EQUIPMENT
EXHAUST SYSTEMS
NITROGEN COMPOUNDS
OXIDES
OXYGEN COMPOUNDS
POLLUTION CONTROL EQUIPMENT
330101* - Internal Combustion Engines- Spark-Ignition
330701 - Emission Control- Nitrogen Oxides