Individual Cylinder Control for Air-Fuel Ratio Cylinder Imbalance

Nakagawa, Shinji; Numata, Akihito; Hori, Tohru

doi:10.4271/2015-01-1624

Cited by 4 publications

(4 citation statements)

References 12 publications

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“…Therefore, condition (10) can guarantee Τ Π < 0; then (18) holds. The estimation of the AFR at the exhaust confluence point can be obtained according to observer (9). In order to obtain the AFR of each cylinder, the relationship between the AFR of each cylinder and the AFR at the exhaust confluence point is analyzed in the following.…”

Section: Journal Of Sensorsmentioning

confidence: 99%

“…The relationship between the AFR of each cylinder and the AFR at the exhaust confluence point can be obtained by (22). The algorithm to estimate the individual cylinder AFR is as follows: First, the AFR at the exhaust confluence point is obtained according to observer (9). Then, the individual cylinder AFR can be calculated through (22).…”

Section: Journal Of Sensorsmentioning

confidence: 99%

“…In order to improve the AFR control accuracy, there has been a great deal of research that focuses on the AFR control of individual cylinders [3][4][5][6][7][8][9][10]. In fact, the estimation of the individual cylinder AFR with a single universal exhaust gas oxygen (UEGO) sensor installed in the exhaust pipe is one of the key technology trends for the individual cylinder AFR control.…”

Section: Introductionmentioning

confidence: 99%

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Estimation of Individual Cylinder Air-Fuel Ratio in Gasoline Engine with Output Delay

Wang

Liu

2016

Journal of Sensors

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The estimation of the individual cylinder air-fuel ratio (AFR) with a single universal exhaust gas oxygen (UEGO) sensor installed in the exhaust pipe is an important issue for the cylinder-to-cylinder AFR balancing control, which can provide high-quality torque generation and reduce emissions in multicylinder engine. In this paper, the system dynamic for the gas in exhaust pipe including the gas mixing, gas transport, and sensor dynamics is described as an output delay system, and a new method using the output delay system observer is developed to estimate the individual cylinder AFR. With the AFR at confluence point augmented as a system state, an observer for the augmented discrete system with output delay is designed to estimate the AFR at confluence point. Using the gas mixing model, a method with the designed observer to estimate the individual cylinder AFR is presented. The validity of the proposed method is verified by the simulation results from a spark ignition gasoline engine from engine software enDYNA by Tesis.

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Section: Journal Of Sensorsmentioning

confidence: 99%

Section: Journal Of Sensorsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Estimation of Individual Cylinder Air-Fuel Ratio in Gasoline Engine with Output Delay

Wang

Liu

2016

Journal of Sensors

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“…Putting the engine type aside, more recent λ measurement applications focus on individual cylinder control [ 6 , 7 ]. In such applications, the market-available sensors pose some problems related to feedback response delay.…”

Section: Introductionmentioning

confidence: 99%

Excess Air Ratio Management in a Diesel Engine with Exhaust Backpressure Compensation

Kasprzyk

Hunicz

Rybak

et al. 2020

Sensors

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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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Control of Cylinder Consistency for a Two-Stroke Spark-Ignition Engine

Sheng

Wei

et al. 2018

Arab J Sci Eng

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Individual Cylinder Control for Air-Fuel Ratio Cylinder Imbalance

Cited by 4 publications

References 12 publications

Estimation of Individual Cylinder Air-Fuel Ratio in Gasoline Engine with Output Delay

Estimation of Individual Cylinder Air-Fuel Ratio in Gasoline Engine with Output Delay

Excess Air Ratio Management in a Diesel Engine with Exhaust Backpressure Compensation

Control of Cylinder Consistency for a Two-Stroke Spark-Ignition Engine

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