Air-Fuel Ratio Control for an IC Engine

Lauber, Jimmy; Khiar, D.; Guerra, Thierry Marie

doi:10.1109/vppc.2007.4544217

Cited by 9 publications

(12 citation statements)

References 12 publications

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“…The mathematical equations used for the model construction are in accordance with the Mean Value Engine Model (MVEM) [ 33 ]. Moreover, it gives accurate AFR as found in practical gasoline engines [ 34 ]. In this model, an integral feedback ratio control is implemented to maintain the AFR to 14.6 with a reduced steady-state error in normal operation.…”

Section: Methodsmentioning

confidence: 99%

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Design of Active Fault-Tolerant Control System for Air-Fuel Ratio control of Internal Combustion engine using nonlinear regression-based observer model

Alsuwian

Amin²,

Iqbal³

et al. 2022

PLoS ONE

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Internal Combustion (IC) engines are prevalent in the process sector, and maintaining sufficient Air-Fuel Ratio (AFR) regulation in their fuel system is crucial for enhanced engine performance, fuel economy, and environmental safety. Faults in the AFR system’s sensors cause the engine to shut down, hence, fault tolerance is essential. In order to avoid engine shutdown, this paper offers a novel Active Fault-Tolerant Control System (AFTCS) for air-fuel ratio control of an Internal Combustion (IC) engine in a process plant. In the Fault Detection and Isolation (FDI) unit, the proposed AFTCS uses a nonlinear regression-based observer model for analytical redundancy. The suggested system was simulated in the MATLAB / Simulink environment. The proposed system was tested at two different speeds (300 r/min and 600 r/min) and the results show that the system’s response is within the acceptable bound without compromising the stability. The findings also demonstrate the higher fault tolerance capability for sensor defects of the AFR control system, particularly for the MAP sensor (at 300 r/min) in terms of reduced oscillatory response in comparison to the current literature. Compared to the linear regression-based and Genetic Algorithm (GA) based model, the nonlinear regression-based model results in a more accurate estimation of the faulty sensors. The proposed model is also efficient in terms of computation power and response time.

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Section: Methodsmentioning

confidence: 99%

“…It’s required for better engine performance, lower fuel consumption, and decreased pollution. Fig 1 depicts the overall design of a SI IC engine’s AFR [ 34 , 35 ].…”

Section: Methodsmentioning

confidence: 99%

Design of Active Fault-Tolerant Control System for Air-Fuel Ratio control of Internal Combustion engine using nonlinear regression-based observer model

Alsuwian

Amin²,

Iqbal³

et al. 2022

PLoS ONE

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“…There are many types of air-fuel ratio control dynamics, including air dynamics, fuel dynamics, sensor model, and controller configuration. 42 Each dynamics' formulation is given here.…”

Section: System Modelingmentioning

confidence: 99%

Genetic algorithm based active fault-tolerant control system for air fuel ratio control of internal combustion engines

Iqbal

Amin

2022

Measurement and Control

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Internal Combustion (IC) engines are commonly used in the process industry, and proper Air-Fuel Ratio (AFR) regulation in their fuel system is essential for improved engine performance, fuel efficiency, and environmental protection. Since faults in the sensors of the AFR system cause the engine to shut down, fault tolerance is essentially required for them. In this paper, an advanced Active Fault-Tolerant Control System (AFTCS) for AFR control of an IC engine is proposed to prevent the engine shutdown. For analytical redundancy, the proposed AFTCS uses the Genetic Algorithm (GA) based observer model in the Fault Detection and Isolation (FDI) unit to generate estimated value for the faulty sensors using the values of other healthy sensors. The proposed framework was simulated in the MATLAB/Simulink environment to verify its effectiveness. In comparison to previous literature works, the results show that the AFR control system has superior fault tolerance output for sensor faults, especially for the MAP sensor, in terms of less oscillatory response. Finally, a comparison of the proposed GA-based AFTCS was carried out with the existing literature works and its superior performance was elaborated.

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“…AFR control dynamics can be divided into three categories: sensor dynamics, fuel dynamics, and air dynamics as explained in. 39 Dynamics of Air:. The dynamics of air intake are explained using conservation of the mass theory and ideal air gas theory as follows…”

Section: Modelling Of Systemmentioning

confidence: 99%

“…where σ 1 = 0.00051, σ 2 = 2.4357, σ 3 = 0.052 and σ 4 = 0.0011 are constants. 39 The g(P r ) is a nonlinear concept in the sense that…”

Section: Modelling Of Systemmentioning

confidence: 99%

Design of active fault-tolerant control system for Air-fuel ratio control of internal combustion engines using fuzzy logic controller

2022

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Background: Fault-Tolerant Control Systems (FTCS) are used in critical and safety applications to improve performance and stability despite failure modes. As a result, costly production losses related to unusual and unplanned shutdowns can be prevented by incorporating these systems in the critical process plant machines. The Internal Combustion (IC) engines are highly used process plant machines and faults in their sensors will cause their shutdown instigating the need to install FTCS in them. Introduction: In this paper, an Active Fault-Tolerant Control System (AFTCS) based on a Fuzzy Logic Controller (FLC) is suggested to improve the reliability of the Air-Fuel Ratio (AFR) control system of an IC engine. Methodology: For analytical redundancy, a nonlinear Fuzzy Logic (FL) based observer is implemented in the proposed system for the Fault Detection and Isolation (FDI) unit for nonlinear sensors of the AFR system. Lyapunov stability analysis was used for designing a stable system in both faulty and normal conditions. To evaluate its performance, this system was developed in the MATLAB/Simulink platform. Results: The simulation results show that the developed system is robust under sensor fault conditions, retaining stability with a minimum decrease of AFR. This study's comparison with the existing literature demonstrates that the proposed system is effective for maintaining the AFR in IC engines during sensor faulty conditions thus reducing shutdown of engine and production loss for increased profits.

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Air-Fuel Ratio Control for an IC Engine

Cited by 9 publications

References 12 publications

Design of Active Fault-Tolerant Control System for Air-Fuel Ratio control of Internal Combustion engine using nonlinear regression-based observer model

Design of Active Fault-Tolerant Control System for Air-Fuel Ratio control of Internal Combustion engine using nonlinear regression-based observer model

Genetic algorithm based active fault-tolerant control system for air fuel ratio control of internal combustion engines

Design of active fault-tolerant control system for Air-fuel ratio control of internal combustion engines using fuzzy logic controller

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