Exhaust gas recirculation system for internal combustion engine

Patent · Tue Apr 08 04:00:00 EST 1980

OSTI ID:5593588

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

An exhaust gas recirculation system is disclosed for an internal combustion engine. The recirculating system is of the type including an exhaust gas recirculation passage for communicating an exhaust tube with an intake tube downstream of a throttle valve disposed therein for recirculating part of exhaust gases from the exhaust tube into the intake tube, and a control valve for controlling the flow rate of exhaust gases flowing through the recirculation passage, there are provided negative pressure control means responsive to the negative intake pressure downstream of the throttle valve in the intake tube for generating a pressure signal the magnitude of which is in proportion to the load on the internal combustion engine, and a modulator responsive to the pressure in the recirculation passage upstream of the control valve for controlling the pressure signal, whereby the pressure signal which is controlled by the modulator operates the recirculation gas flow rate control valve in such a manner that the volume of exhaust gases to be recirculated may be in proportion to the load on the engine.

• Assignee: Nippon Soken Inc (Japan); Toyota Jidosha Kogyo K K (Japan)
• Patent Number(s): US 4196706
• OSTI ID: 5593588
• Country of Publication: United States
• Language: English

Related Subjects

33 ADVANCED PROPULSION SYSTEMS
330100* -- Internal Combustion Engines
CONTROL EQUIPMENT
ENGINES
EQUIPMENT
EXHAUST RECIRCULATION SYSTEMS
EXHAUST SYSTEMS
FLOW RATE
FLOW REGULATORS
HEAT ENGINES
INTERNAL COMBUSTION ENGINES
MODULATION
POLLUTION CONTROL EQUIPMENT
PRESSURE DEPENDENCE
VALVES