Exhaust gas recirculating system

Patent · Tue Jan 31 04:00:00 EST 1978

OSTI ID:5095984

Harada, I

An internal combustion engine equipped with an exhaust gas recirculating system is described. The exhaust gas recirculating system comprises an EGR valve normally closing an EGR duct to prevent recirculation and movable by a signal vacuum applied thereto to an open position and control means operable to provide a signal vacuum. The control means includes a vacuum line connecting a vacuum port communicating with the carburetor throttle bore above the idle speed position of the throttle valve to the EGR valve, air bleed means including a vent in the vacuum line and flow restricting means in the vacuum line fluidly intermediate the vacuum port and vent. The air bleed means includes an air bleed control valve movable into and out of the vent to close or open the same; spring means biasing the air bleed valve closed; servo means connected to the air bleed control valve for moving it to an open vent position in response to vacuum in the vacuum line intermediate the flow restricting means and EGR valve; means for biasing the servo means in response to the engine intake manifold vacuum in a direction to move the air bleed control valve to an open vent position; and means for biasing the biasing means to vary movement of the air bleed control valve to an open vent position.

• Assignee: Nissan Motor Co., Ltd.
• Patent Number(s): US 4071006
• OSTI ID: 5095984
• Country of Publication: United States
• Language: English

Related Subjects

33 ADVANCED PROPULSION SYSTEMS
330701* -- Emission Control-- Nitrogen Oxides
AIR
AIR POLLUTION CONTROL
CHALCOGENIDES
CONTROL EQUIPMENT
DESIGN
DUCTS
ENGINES
EQUIPMENT
EXHAUST GASES
EXHAUST RECIRCULATION SYSTEMS
EXHAUST SYSTEMS
FLOW REGULATORS
FLUIDS
GASEOUS WASTES
GASES
INTERNAL COMBUSTION ENGINES
MACHINE PARTS
NITROGEN COMPOUNDS
NITROGEN OXIDES
OPERATION
OXIDES
OXYGEN COMPOUNDS
POLLUTION CONTROL
POLLUTION CONTROL EQUIPMENT
PRESSURE DEPENDENCE
SERVOMECHANISMS
SPRINGS
VALVES
VENTS
WASTES