Fast-Response Zirconia Sensor-Based Instrument for Measurement of the Air/Fuel Ratio of Combustion Exhaust 840061
A fast-response zirconia sensor-based instrument has been developed to measure the air/fuel ratio (A/F) of combustion exhaust. This instrument uses a reduced-pressure sampling system which improves instrument response time (due to faster diffusion at lower pressures) and eliminates the need for a heated sample line. The measured response time of the described instrument is 170 ms (0-90%) for a step-change in O2 concentration. The prototype instrument is easily calibrated in less than 2 min, requiring only nitrogen and room air for calibration. A complete description of the instrument is given. Results of tests comparing the instrument accuracy to a chemical balance technique are given. Also, a comparison study was conducted with the prototype instrument and a conventional zirconia sensor-based A/F monitor (Lamdascan, Sensors, Inc., Ann Arbor, Mich.) with respect to accuracy and response time.
Citation: Butler, J., Haack, L., Colvin, A., and McKelvy, F., "Fast-Response Zirconia Sensor-Based Instrument for Measurement of the Air/Fuel Ratio of Combustion Exhaust," SAE Technical Paper 840061, 1984, https://doi.org/10.4271/840061. Download Citation
James W. Butler, Larry P. Haack, Alex D. Colvin, Frederick E. McKelvy
Ford Motor Co. Scientific Research Lab.
SAE International Congress and Exposition
Engine Testing-SP-0582, SAE 1984 Transactions-V93-84