Oxygen concentration sensing device for an air-fuel ratio control system of an automotive internal combustion engine

Patent · Tue Nov 17 04:00:00 EST 1987

OSTI ID:5743305

Asakura, M; Kawanabe, T; Kushida, N; Hasebe, H

An oxygen concentration sensing device for use in an air/fuel ratio control system for an internal combustion engine in which a target air/fuel ratio is determined in accordance with at least one of the operational parameters of the internal combustion engine and in which an air/fuel ratio of a supplied mixture is controlled toward the target air/fuel ratio in response to an oxygen concentration in the exhaust gas is described comprising: an oxygen concentration sensor unit disposed in an exhaust passage of the internal combustion engine. The oxygen concentration sensor unit includes an oxygen pump element and a sensor cell element which define a restricted region therebetween and each of which comprises a solid electrolyte member having oxygen ion permeability and has a pair of electrodes provided on both sides thereof; current supply means for supplying a pump current, which has a magnitude defined in accordance with the target air/fuel ratio, across the electrodes of the oxygen pump element thereby causing the sensor unit to generate a sensor voltage across the electrodes of the sensor cell element which is substantially in proportion to the oxygen concentration in the exhaust gas; and comparing means for comparing the sensor voltage with a predetermined reference voltage, and producing an output signal representing the result of the comparison as an oxygen concentration detection signal.

• Assignee: Honda Giken Kogyo Kabushiki Kaisha, Tokyo
• Patent Number(s): US 4706637
• OSTI ID: 5743305
• Country of Publication: United States
• Language: English

Related Subjects

33 ADVANCED PROPULSION SYSTEMS
330100* -- Internal Combustion Engines
AUTOMOTIVE FUELS
CONTROL SYSTEMS
DETECTION
ELEMENTS
ENGINES
ENRICHMENT
FUEL INJECTION SYSTEMS
FUEL SYSTEMS
FUEL-AIR RATIO
FUELS
HEAT ENGINES
INTERNAL COMBUSTION ENGINES
MEASURING INSTRUMENTS
MONITORS
NONMETALS
OPERATION
OXYGEN
OXYGEN ENRICHMENT