Comparative evaluation of virtual and physical NOx sensors for Diesel engine control

Proceedings of the 3rd International Conference on Mechatronics, 2008
Author(s):Alberer D., Hirsch M., del Re L.
For closed-loop control as well as on-board-diagnosis in combustion engines, there is increasing interest for online emission measurement. This paper shows a comparative evaluation of online nitrogen oxides (NOx) sensors for production Diesel engines. Two totally different types of sensors are compared: The first is a physical solid-state sensor and the second is a virtual sensor where NOx values are not measured but calculated by a mathematical model. Specifications of the sensors are presented, advantages and disadvantages are analyzed and ways of combinations are mentioned.
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