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Air-Fuel Ratio Sensor for Rich, Stoichiometric and Lean Ranges
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English
Abstract
This paper describes the sensing principle of a new air-fuel ratio sensor, which has the ability to detect air-fuel ratios in rich, stoichiometric and lean ranges. The sensing part is composed of a gas diffusion layer and a zirconia solid electrolyte with a pair of electrodes which function as an anode and a cathode. The anode and the cathode electrodes are exposed to the atmosphere and the exhaust gas, respectively.
To obtain the bidirectional pumping current between the two electrodes, the potential of the cathode is held to a constant value higher than the electronic circuit ground. The electromotive force induced between the two electrodes is forcibly controlled to a constant value by the electronic circuit. In this composition, three ranges of air-fuel ratio can be detected by the amount of pumping current.
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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.
- Minoru Ohsuga - Hitachi Research Laboratory Hitachi, Ltd.
- Shigeru Tanaka - Hitachi Research Laboratory Hitachi, Ltd.
- Sadayasu Ueno - Sawa Works. Hitachi, Ltd.
- Norio Ichikawa - Sawa Works. Hitachi, Ltd.
Topic
Citation
Suzuki, S., Sasayama, T., Miki, M., Ohsuga, M. et al., "Air-Fuel Ratio Sensor for Rich, Stoichiometric and Lean Ranges," SAE Technical Paper 860408, 1986, https://doi.org/10.4271/860408.Also In
References
- Vassell William C. Logothetis E. M. Hetrick Robert E. “Extended Range Air-to-Fuel Ratio Sensor” SAE Paper 841250 October 1984
- Soejima Shigeo Mase Shunzo “Multi-Layered Zirconia Oxygen Sensor for Lean Burn Engine Application” SAE Paper 850378 February 1985
- Suzuki Seikoo Sasayama Takao Miki Masayuki Yokono Hitoshi Iwanaga Shooichi Ueno Sadayasu “Thick-Film Zirconia Air-Fuel Ratio Sensor with a Heater for” Lean Mixture Control Systems” SAE Paper 850379 February 1985
- Suzuki Seikoo Sasayama Takao Miki Masayuki Yokono Hitoshi Iwanaga Shooichi Ueno Sadayasu “Integrated Zirconia Air-Fuel Ratio Sensor for Automotive Engine Control” International conference on Solid-state Sensors and Actuators Digest of Technical Papers June 1985 333 335
- ohsuga Minoru Ohyama Yoshishige “Measurement of Air-Fuel Ratios in Rich and Lean Ranges Using a Zirconia Solid Electrolyte Sensor” The 5th Symposium on Internal combustion Engines (JSME in Japan) June 1985 121 126
- 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