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Thick-Film Zirconia Air-Fuel Ratio Sensor with a Heater for Lean Mixture Control Systems
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English
Abstract
This paper describes the design and operation of a thick-film zirconia air-fuel ratio sensor with a heater. This sensor is composed of two zirconia plate cells, a stoichiometric cell and a lean cell, laminated on the platinum heater. It is fabricated as one body using a thick-film process. The pair of cells has a gas diffusion chamber and a slit type gas diffusion aperture.
The sensing principle is based on the rate-determining diffusion of oxygen molecules at the gas diffusion aperture. By using an oxygen pumping phenomenon, air-fuel ratios of the stoichiometric and lean regions can be detected.
As this sensor is heated to a high constant temperature, it has sufficient accuracy without any additional temperature compensation. Its starting time is short and response time is very quick.
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Authors
- Seikoo Suzuki - Hitachi Research Laboratory Hitachi, Ltd.
- Takao Sasayama - Hitachi Research Laboratory Hitachi, Ltd.
- Masayuki Miki - Hitachi Research Laboratory Hitachi, Ltd.
- Hitoshi Yokono - Production Engineering Research Laboratory Hitachi, Ltd.
- Shooichi Iwanaga - Production Engineering Research Laboratory Hitachi, Ltd.
- Sadayasu Ueno - Sawa Works, Hitachi, Ltd.
Citation
Suzuki, S., Sasayama, T., Miki, M., Yokono, H. et al., "Thick-Film Zirconia Air-Fuel Ratio Sensor with a Heater for Lean Mixture Control Systems," SAE Technical Paper 850379, 1985, https://doi.org/10.4271/850379.Also In
References
- Yanagida Hiroaki Brook R.J. Kroger F.A. “Direct Current-Voltage Characteristics of Calcia Stabilized Zirconia with Porous Platinum Electrodes” Electrochemical Science May 1970 593 601
- hamann Eckehardt Manger Hansjörg Steinke Leo “Lambda-Sensor with Y 2 O 3 - Stabilized ZrO 2 - Ceramic for Application in Automotive Emission Control Systems” SAE Paper 770401 SAE Congress Detroit February 1977