Oxygen concentration sensing device for an air-fuel ratio control system of an automotive internal combustion engine
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
Similar Records
Method for controlling an oxygen concentration sensor for sensing an oxygen concentration in an exhaust gas of an internal combustion engine
Air/fuel ratio control system for an internal combustion engine with a function for preventing the blackening phenomenon of oxygen concentration sensor
Related Subjects
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