CoO sensors for measurement and control of exhaust from lean-burn engines. SAE Paper 760312

Conference · Thu Jan 01 04:00:00 EST 1976

OSTI ID:6709923

Beaudoin, G L; Laud, K R; Logothetis, E M; Meitzler, A H; Park, K

An experimental exhaust sensor using CoO ceramic is being developed for measuring and controlling air-to-fuel ratio (A/F) of internal combustion engines operating under lean-burn conditions. The operation of the sensor is based on the fact that at elevated temperatures the electrical resistance of CoO depends on the oxygen partial pressure (P/sub O/sub 2//). At controlled temperatures, the combination of good P/sub O/sub 2// sensitivity, high reproducibility of the electrical properties and small temperature coefficient of resistance of CoO materials make this sensor suitable for the lean A/F range (15 to 20) where exhaust P/sub O/sub 2// depends only weakly on A/F ratio. At low P/sub O/sub 2// (A/F < 13.5) and high temperatures, CoO reduces to Co; therefore, prolonged exposure of the sensor to these conditions must be avoided. The material properties and the sensor characteristics are discussed and results of tests on car-mountable CoO sensors are presented. Durability and large-scale manufacturability of these sensors have not yet been established.

• OSTI ID: 6709923
• Report Number(s): CONF-760278-5
• Country of Publication: United States
• Language: English

Related Subjects

33 ADVANCED PROPULSION SYSTEMS
330700* -- Advanced Propulsion Systems-- Emission Control
AIR POLLUTION CONTROL
AUTOMOBILES
CHALCOGENIDES
COBALT COMPOUNDS
COBALT OXIDES
CONTROL EQUIPMENT
DATA
ENGINES
EQUIPMENT
EXHAUST GASES
EXPERIMENTAL DATA
FLUIDS
FUEL-AIR RATIO
GASEOUS WASTES
GASES
HEAT ENGINES
INFORMATION
INTERNAL COMBUSTION ENGINES
NUMERICAL DATA
OXIDES
OXYGEN COMPOUNDS
PERFORMANCE
POLLUTION CONTROL
TRANSITION ELEMENT COMPOUNDS
VEHICLES
WASTES