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Long Term Stable NOx Sensor with Integrated In-Connector Control Electronics
Technical Paper
1999-01-0202
ISSN: 0148-7191, e-ISSN: 2688-3627
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English
Abstract
This paper describes improvements achieved with regard to the long term stability and the system integrability of a previously described thick film NOx sensor for gasoline lean burn and diesel applications. (1, 2, 3)
Durability test up to 1000 hours consisting of a temperature cycle have been carried out by a stoichiometric operating gasoline engine test bench. The NOx sensor demonstrates the NOx output shift in terms of the NOx sensitivity less than 5 % on a model gas apparatus and ± 7 % measuring accuracy in practical operating condition on a diesel engine after 1000 hours that is equivalent to approximately 60K miles driving.
The integration of the control electronics for the sensor in its connector is achieved for the sensitive measuring current in the μA-range or less on vehicle applications. The developed electronics functions closed-loop controls for a tip temperature and oxygen pumps as well as a diagnosis of sensor malfunctions.
It also allows a bi-directional data transmission with the engine management system. The NOx sensor demonstrates a feasibility for a regeneration control and an OBD of a NOx storage catalyst system.
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Authors
Topic
Citation
Kato, N., Kokune, N., Lemire, B., and Walde, T., "Long Term Stable NOx Sensor with Integrated In-Connector Control Electronics," SAE Technical Paper 1999-01-0202, 1999, https://doi.org/10.4271/1999-01-0202.Also In
Electronic Engine Controls 1999: Sensors, Actuators, and Development Tools
Number: SP-1418; Published: 1999-03-01
Number: SP-1418; Published: 1999-03-01
References
- Kato N. Nakagaki N. Ina N. “Thick film ZrO2 NOx sensor” SAE paper # 960334 1996
- Kato N. Hamada Y. Kurachi H. “Performance of thick film NOx sensor on diesel and gasoline engines” SAE paper # 970858 1997
- Kato N. Kurachi H. Hamada Y. “Thick film ZrO2 NOx sensor for the measurement of low NOx concentration” SAE paper # 980170 1998
- Walsh Michael P. “Global trends in diesel emissions control-A 1998 update” SAE paper # 980186 1998
- Harada J. Tomodita T. Mizuno H. et.al. “Development of direct injection gasoline engine” SAE # 970540 1998
- Noma K. Iwamoto Y. Murakai N. et.al. “Optimized gasoline direct injection engine for the European market” SAE paper # 980150 1998
- Peters A. Langer H.J. Joki B. Mueller W. et.al. “Catalytic NOx reduction on passenger car diesel common rail engine” SAE paper # 980191 1998
- Brogan M.S. Clark A.D. Brisley R.J. “Recent progress in NOx trap technology” SAE paper # 980933 1998