Exhaust gas recirculation control system for an internal combustion engine

Patent · Tue Mar 01 00:00:00 EST 1988

OSTI ID:5059029

Nishida, M; Inoue, N

An exhaust gas recirculation control system for an internal combustion engine is described which comprises; an exhaust gas recirculation control valve for controlling a recirculation rate for exhaust gas to be mixed with intake air which is supplied to the internal combustion engine, an oxygen sensor disposed in an intake air passage downstream of the control valve to detect the concentration of oxygen in the intake air, a control means which compares the oxygen concentration detected by the oxygen sensor with a desired oxygen concentration previously determined depending on operational conditions of the engine and controls the degree of opening of the exhaust gas recirculation control valve so as to cancel the deviation between the detected oxygen concentration and the desired oxygen concentration, a detecting means for detecting the exhaust gas recirculation rate being zero to supply a signal to the control means on the basis of the detection, and a correcting means for correcting the corresponding relation between the output of the oxygen sensor and the detected oxygen concentration on the basis of the output of the oxygen sensor when the exhaust gas recirculation rate is zero.

• Assignee: Mitsubishi Denki Kabushiki Kaisha, Tokyo
• Patent Number(s): US 4727849
• OSTI ID: 5059029
• Resource Relation: Patent File Date: Filed date 23 Apr 1987
• Country of Publication: United States
• Language: English

Related Subjects

20 FOSSIL-FUELED POWER PLANTS
54 ENVIRONMENTAL SCIENCES
EXHAUST RECIRCULATION SYSTEMS
DESIGN
VALVES
AIR FLOW
AIR POLLUTION CONTROL
EXHAUST GASES
FLOW RATE
INTERNAL COMBUSTION ENGINES
METERING
OPERATION
OXYGEN ENRICHMENT
CONTROL
CONTROL EQUIPMENT
ENGINES
ENRICHMENT
EQUIPMENT
EXHAUST SYSTEMS
FLOW REGULATORS
FLUID FLOW
FLUIDS
GAS FLOW
GASEOUS WASTES
GASES
HEAT ENGINES
POLLUTION CONTROL
POLLUTION CONTROL EQUIPMENT
WASTES
200202* - Fossil-Fueled Power Plants- Waste Management- Noxious Gas & Particulate Emissions
500200 - Environment
Atmospheric- Chemicals Monitoring & Transport- (-1989)