Excess Air Ratio Management in a Diesel Engine with Exhaust Backpressure Compensation
1
Faculty of Mechanical Engineering, Lublin University of Technology, 20-618 Lublin, Poland
2
School of Technology and Innovations, Energy Technology, University of Vaasa, 65200 Vaasa, Finland
*
Author to whom correspondence should be addressed.
Sensors 2020, 20(22), 6701; https://doi.org/10.3390/s20226701
Received: 15 October 2020
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Revised: 9 November 2020
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Accepted: 11 November 2020
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Published: 23 November 2020
(This article belongs to the Section Physical Sensors)
The paper investigates the operation of a wideband universal exhaust gas oxygen (UEGO) sensor in a diesel engine under elevated exhaust backpressure. Although UEGO sensors provide the excess air ratio feedback signal primarily in spark ignition engines, they are also used in diesel engines to facilitate low-emission combustion. The excess air signal is used as an input for the fuel mass observer, as well as to run the engine in the low-emission regime and enable smokeless acceleration. To ensure a short response time and individual cylinder control, the UEGO sensor can be installed upstream of a turbocharger; however, this means that the exhaust gas pressure affects the measured oxygen concentration. Therefore, this study determines the sensor’s sensitivity to the exhaust pressure under typical conditions for lean burn low-emission diesel engines. Identification experiments are carried out on a supercharged single-cylinder diesel engine with an exhaust system mimicking the operation of the turbocharger. The apparent excess air measured with the UEGO sensor is compared to that obtained in a detailed exhaust gas analysis. The comparison of reference and apparent signals shows that the pressure compensation correlations used in gasoline engines do not provide the correct values for diesel engine conditions. Therefore, based on the data analysis, a new empirical formula is proposed, for which the suitability for lean burn diesel engines is verified.
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MDPI and ACS Style
Kasprzyk, P.; Hunicz, J.; Rybak, A.; Gęca, M.S.; Mikulski, M. Excess Air Ratio Management in a Diesel Engine with Exhaust Backpressure Compensation. Sensors 2020, 20, 6701. https://doi.org/10.3390/s20226701
AMA Style
Kasprzyk P, Hunicz J, Rybak A, Gęca MS, Mikulski M. Excess Air Ratio Management in a Diesel Engine with Exhaust Backpressure Compensation. Sensors. 2020; 20(22):6701. https://doi.org/10.3390/s20226701
Chicago/Turabian StyleKasprzyk, Piotr, Jacek Hunicz, Arkadiusz Rybak, Michał S. Gęca, and Maciej Mikulski. 2020. "Excess Air Ratio Management in a Diesel Engine with Exhaust Backpressure Compensation" Sensors 20, no. 22: 6701. https://doi.org/10.3390/s20226701
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