Exhaust gas recirculation system

Patent · Tue Aug 04 04:00:00 EDT 1987

OSTI ID:6200920

Sugiura, K

An exhaust gas recirculation system is described for an engine having a throttle valve in an intake passage, comprising: the intake passage having an EGR port provided adjacent to the upstream side of the throttle valve at the closed position. A control port provides a position at downstream of the throttle valve at the closed position. A leak port provides at upstream of the throttle valve; an EGR valve recirculates exhaust gases to the intake passage. The EGR valve has a diaphragm defining a first chamber applied with the pressure at the EGR port and a second chamber is applied with the pressure at the leak port. A valve body connects to the diaphragm for controlling the amount of recirculated gases; a control valve has a diaphragm defining a first control chamber and a second control chamber, and valve means on the diaphragm. The first control chamber is pressured at the EGR port. The second control chamber is applied with the pressure at the control port through a first conduit having an end port and with the pressure at the leak port through a second conduit. The valve means is arranged to open the end port of the first conduit when the difference between pressures in the first and second control chambers exceeds a predetermined value. Pressure regulating means renders the pressure in the second control chamber lower than the pressure in the second chamber of the EGR valve.

• Assignee: Fuji Jukogyo Kabushiki Kaisha, Tokyo
• Patent Number(s): US 4683863
• OSTI ID: 6200920
• Country of Publication: United States
• Language: English

Related Subjects

33 ADVANCED PROPULSION SYSTEMS
330700* -- Advanced Propulsion Systems-- Emission Control
CONTROL
CONTROL EQUIPMENT
DESIGN
ENGINES
EQUIPMENT
EXHAUST GASES
EXHAUST RECIRCULATION SYSTEMS
EXHAUST SYSTEMS
FLOW REGULATORS
FLUID FLOW
FLUIDS
GAS FLOW
GASEOUS WASTES
GASES
HEAT ENGINES
INTAKE STRUCTURES
INTERNAL COMBUSTION ENGINES
MECHANICAL STRUCTURES
OPERATION
POLLUTION CONTROL EQUIPMENT
PRESSURE CONTROL
PRESSURE DEPENDENCE
PRESSURE REGULATORS
VALVES
VEHICLES
WASTES