Exhaust gas recirculation control system for an engine

Patent · Tue Nov 10 00:00:00 EST 1987

OSTI ID:5683744

Asayama, Y

An exhaust gas recirculation control system for an internal combustion engine is described comprising: (a) an intake duct for introducing intake air to the engine; (b) a throttle valve mounted in the intake duct for controlling the flow rate of the intake air; (c) an exhaust pipe for discharging exhaust gas from the engine; (d) conduit means for recirculating exhaust gas from the exhaust pipe back to the intake duct; (e) an exhaust gas recirculation control valve operatively coupled in the conduit means for controlling the flow rate of the recirculated exhaust gas; (f) an oxygen sensor mounted in the intake duct downstream of the opening for sensing the oxygen concentration in the mixed gas flowing in the intake duct; (g) a control unit for controlling the control valve in response to the output of the oxygen sensor to adjust the exhaust gas recirculation rate to a desired value; and (h) means for introducing air as a reference gas to a reference air chamber of the oxygen sensor from a point upstream of the opening but downstream of the throttle valve.

• Assignee: Mitsubishi Denki Kabushiki Kaisha, Tokyo
• Patent Number(s): US 4705009
• OSTI ID: 5683744
• Resource Relation: Patent File Date: Filed date 7 Oct 1986
• Country of Publication: United States
• Language: English

Related Subjects

33 ADVANCED PROPULSION SYSTEMS
54 ENVIRONMENTAL SCIENCES
EXHAUST RECIRCULATION SYSTEMS
DESIGN
AIR FLOW
AIR POLLUTION CONTROL
CONTROL SYSTEMS
FLOW RATE
INTERNAL COMBUSTION ENGINES
MONITORS
VALVES
CONTROL
CONTROL EQUIPMENT
ENGINES
EQUIPMENT
EXHAUST SYSTEMS
FLOW REGULATORS
FLUID FLOW
GAS FLOW
HEAT ENGINES
MEASURING INSTRUMENTS
POLLUTION CONTROL
POLLUTION CONTROL EQUIPMENT
330700* - Advanced Propulsion Systems- Emission Control
500200 - Environment
Atmospheric- Chemicals Monitoring & Transport- (-1989)