11/27/2022 0 Comments Etas lambda meter la4 manualTherefore, based on the data analysis, a new empirical formula is proposed, for which the suitability for lean burn diesel engines is verified. 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. The apparent excess air measured with the UEGO sensor is compared to that obtained in a detailed exhaust gas analysis. Identification experiments are carried out on a supercharged single-cylinder diesel engine with an exhaust system mimicking the operation of the turbocharger. Therefore, this study determines the sensor’s sensitivity to the exhaust pressure under typical conditions for lean burn low-emission diesel engines. 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. 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. 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 paper investigates the operation of a wideband universal exhaust gas oxygen (UEGO) sensor in a diesel engine under elevated exhaust backpressure.
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