System for compensating an oxygen sensor in an emission control system
A system for compensating an oxygen sensor in an emission control system for an automotive engine having a fuel supply device for supplying fuel to cylinders, the oxygen sensor, a control circuit responsive to the output of the oxygen sensor for controlling the air-fuel ratio of mixture to stoichiometry, is described comprising; proportion and integration circuit means included in the control circuit for producing a PI signal at a constant of proportionality and a constant of integration; first means for detecting the steady state of the operation of the engine; second means for detecting the period of the output of the oxygen sensor at the steady state detected by the first means; a comparator for comparing the period detected by the second means with a predetermined reference value and for producing a difference signal when the period is longer than the reference value; third means for changing the constant of proportionality and integration responsive to the difference signal so as to correct the deviation of the air-fuel ratio from the stoichiometry.
- Assignee:
- Fuji Jukogyo Kabushiki Kaisha, Tokyo
- Patent Number(s):
- US 4744344
- OSTI ID:
- 7034046
- Country of Publication:
- United States
- Language:
- English
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Air-fuel ratio control system
Air-fuel ratio control system
Related Subjects
330100* -- Internal Combustion Engines
330700 -- Advanced Propulsion Systems-- Emission Control
500200 -- Environment
Atmospheric-- Chemicals Monitoring & Transport-- (-1989)
54 ENVIRONMENTAL SCIENCES
AIR POLLUTION CONTROL
COMPARATOR CIRCUITS
CONTROL
CONTROL EQUIPMENT
DETECTION
ELECTRONIC CIRCUITS
ELEMENTS
EMISSION
ENGINES
EQUIPMENT
FUEL SYSTEMS
FUEL-AIR RATIO
HEAT ENGINES
INTERNAL COMBUSTION ENGINES
NONMETALS
OPERATION
OXYGEN
POLLUTION CONTROL
POLLUTION CONTROL EQUIPMENT