Long Term Stable NOx Sensor with Integrated In-Connector Control Electronics 1999-01-0202
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.
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. Download Citation
Author(s):
Nobuhide Kato, Nobuyuki Kokune, Bertrand Lemire, Tim Walde
Affiliated:
NGK Insulators, Ltd., Siemens AG
Pages: 9
Event:
International Congress & Exposition
ISSN:
0148-7191
e-ISSN:
2688-3627
Also in:
Sensors and Transducers-PT-68, Electronic Engine Controls 1999: Sensors, Actuators, and Development Tools-SP-1418, Sensors and Transducers, Second Edition-PT-105
Related Topics:
Lean burn engines
Diesel / compression ignition engines
Nitrogen oxides
Sensors and actuators
On-board diagnostics (OBD)
Gasoline
Catalysts
Transmissions
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