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Oxygen Sensor for CNG Application as ULEV or Tighter Emission Vehicle
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Abstract
Two distinctive λ sensors have been developed for a compressed natural gas (CNG) vehicle that complies with OBD-II.
As the upstream sensor, there is employed an element which obtains an additional catalyst coating layer to enhance combustion of CH4 and H2 that reaches to the surface of the element. Meanwhile, as the downstream sensor, there is employed an element having an electrode that is intentionally inactive with CH4, to eliminate the temperature dependent chemical reaction of CH4 remaining after the catalyst converter, and to avoid false catalyst monitoring.
Use of the above two kinds of λ sensors enables construction of an O2 feedback system for a CNG engine that complies with OBD-II.
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Mizutani, A., Okawa, T., Matsuzaki, H., Kubota, H. et al., "Oxygen Sensor for CNG Application as ULEV or Tighter Emission Vehicle," SAE Technical Paper 980264, 1998, https://doi.org/10.4271/980264.Also In
References
- Saji Keiichi Kondo Haruyoshi Takeuchi Takashi Igarashi Isemi Voltage Step Characteristics of Oxygen Concentration Cell Sensors for Nonequilibrium Gas Mixtures J.Electrochem.Soc. 135 7 1686 1691 1988
- Suga Toshiyuki Knight Ben Arai Sakuji Near-Zero Emission Natural Gas Vehicle, Honda Civic GX SAE Paper No. 972643