Engine control with exhaust gas recirculation

Patent · Tue Feb 03 04:00:00 EST 1987

OSTI ID:6813622

Kodama, K; Yamazoe, H

This patent describes an apparatus for controlling the amount of exhaust gases to be recirculated from an exhaust passage of an internal combustion engine to an intake passage of the same, comprising: (a) means for detecting various engine parameters; (b) gas sensor means for detecting the concentration of an exhaust gas in the exhaust passage; (c) means for forcibly interrupting exhaust gas recirculation when the engine is under air/fuel ratio feedback control and exhaust gas recirculation is being performed; and (d) computing means for computing a value representing a desired amount of exhaust to be recirculated using engine parameters and for: (1) producing a correction factor using an output signal from the gas sensor means; (2) obtaining a first mean value of a first plurality of feedback correction factor values during feedback control of air/fuel ratio and during exhaust gas recirculation control; (3) interrupting exhaust gas recirculation during air/fuel ratio feedback control; and (4) obtaining a second mean value of second feedback correction factor values when exhaust gas recirculation is being interrupted.

• Assignee: Nippondenso Co., Ltd., Kariya
• Patent Number(s): US 4640257
• OSTI ID: 6813622
• Country of Publication: United States
• Language: English

Related Subjects

33 ADVANCED PROPULSION SYSTEMS
330100* -- Internal Combustion Engines
330700 -- Advanced Propulsion Systems-- Emission Control
COMBUSTION CONTROL
COMPUTERIZED CONTROL SYSTEMS
CONTROL
CONTROL SYSTEMS
CORRECTIONS
ENGINES
EQUIPMENT
EXHAUST GASES
EXHAUST RECIRCULATION SYSTEMS
EXHAUST SYSTEMS
FEEDBACK
FLUIDS
FUEL-AIR RATIO
GAS METERS
GASEOUS WASTES
GASES
HEAT ENGINES
INTAKE STRUCTURES
INTERNAL COMBUSTION ENGINES
MEASURING INSTRUMENTS
MECHANICAL STRUCTURES
METERS
POLLUTION CONTROL EQUIPMENT
WASTES