An on-engine method for dynamic characterisation of NOx concentration sensors |
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| Authors: | J Galindo D Blanco-Rodriguez |
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| Institution: | a CMT Motores Térmicos, Universidad Politécnica de Valencia, Camino de Vera s/n, E-46022 Valencia, Spain
b CREVER-Group of Applied Thermal Engineering, Department of Mechanical Engineering, Universitat Rovira i Virgili, Av. pa?¨sos Catalans 26, 43007 Tarragona, Spain |
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| Abstract: | An on-engine method for dynamic characterisation of automotive NOx concentration sensors is presented. Steps in start of injection on a diesel engine are employed to achieve step-like NOx concentration variations on exhaust flow. On the basis of the sensor response, delay and dynamic response can be easily identified; the paper shows a simple least squares procedure although other models and identification techniques could be used. Application data is presented for three NOx sensors: a research-grade chemiluminescence exhaust gas analyser, and two different commercial ZrO2-based sensors. |
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| Keywords: | Combustion engine NOx ZrO2 sensor SOI Measurement techniques Sensor calibration On-board diagnostics |
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