Excess Air Ratio Management in a Diesel Engine with Exhaust Backpressure Compensation
| Autor: | Piotr Kasprzyk, Maciej Mikulski, Jacek Hunicz, Arkadiusz Rybak, Michał Gęca |
|---|---|
| Jazyk: | angličtina |
| Rok vydání: | 2020 |
| Předmět: |
exhaust backpressure
020209 energy 02 engineering and technology Combustion Diesel engine lcsh:Chemical technology Biochemistry Automotive engineering Article Analytical Chemistry Cylinder (engine) law.invention Diesel fuel 0203 mechanical engineering law 0202 electrical engineering electronic engineering information engineering lcsh:TP1-1185 Electrical and Electronic Engineering Instrumentation Exhaust gas wideband oxygen sensor Atomic and Molecular Physics and Optics Ignition system 020303 mechanical engineering & transports Environmental science pressure compensation Lean burn Turbocharger diesel engine |
| Zdroj: | Sensors, Vol 20, Iss 6701, p 6701 (2020) Sensors Volume 20 Issue 22 Sensors (Basel, Switzerland) |
| ISSN: | 1424-8220 |
| Popis: | 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&rsquo 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. |
| Databáze: | OpenAIRE |
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