scholarly journals A Study on the Combustion and Exhaust Emission Characteristics with the Variations of Mixing and Air-fuel Ratio of Bio-ethanol - Gasoline in a SI Engine

2016 ◽  
Vol 24 (3) ◽  
pp. 358-364
Author(s):  
Seunghyun Yoon ◽  
Sungyong Ha
Keyword(s):  
Exhaust Emission ◽  
Emission Characteristics ◽  
Si Engine ◽  
Fuel Ratio

scholarly journals Adaptive Air-Fuel Ratio Regulation for Port-Injected Spark-Ignited Engines Based on a Generalized Predictive Control Method

Energies ◽  
2019 ◽  
Vol 12 (1) ◽  
pp. 173 ◽  
Author(s):  
Lei Meng ◽  
Xiaofeng Wang ◽  
Chunnian Zeng ◽  
Jie Luo
Keyword(s):  
Predictive Control ◽  
Noise Suppression ◽  
Control Method ◽  
Simulation Analysis ◽  
Catalytic Converter ◽  
Exhaust Emission ◽  
Generalized Predictive Control ◽  
Si Engine ◽  
Fuel Ratio ◽  
Wall Wetting

The accurate air-fuel ratio (AFR) control is crucial for the exhaust emission reduction based on the three-way catalytic converter in the spark ignition (SI) engine. The difficulties in transient cylinder air mass flow measurement, the existing fuel mass wall-wetting phenomenon, and the unfixed AFR path dynamic variations make the design of the AFR controller a challenging task. In this paper, an adaptive AFR regulation controller is designed using the feedforward and feedback control scheme based on the dynamical modelling of the AFR path. The generalized predictive control method is proposed to solve the problems of inherent nonlinearities, time delays, parameter variations, and uncertainties in the AFR closed loop. The simulation analysis is investigated for the effectiveness of noise suppression, online prediction, and self-correction on the SI engine system. Moreover, the experimental verification shows an acceptable performance of the designed controller and the potential usage of the generalized predictive control in AFR regulation application.

Influence of Air/Fuel Ratio on Cyclic Variation and Exhaust Emission in Natural Gas SI Engine

1999 ◽  
Author(s):  
Livier Ben ◽  
Nathalie Raud-Ducros ◽  
Remy Truquet ◽  
Georges Charnay
Keyword(s):  
Natural Gas ◽  
Exhaust Emission ◽  
Cyclic Variation ◽  
Si Engine ◽  
Fuel Ratio

scholarly journals Intake Air Mass Observer Design Based on Extended Kalman Filter for Air-Fuel Ratio Control on SI Engine

Energies ◽  
2019 ◽  
Vol 12 (18) ◽  
pp. 3444
Author(s):  
Lei Meng ◽  
Jie Luo ◽  
Xu Yang ◽  
Chunnian Zeng
Keyword(s):  
Kalman Filter ◽  
Extended Kalman Filter ◽  
Catalytic Converter ◽  
Random Noise ◽  
Observer Design ◽  
Exhaust Emission ◽  
Si Engine ◽  
Air Mass ◽  
Fuel Ratio ◽  
Experiment Validation

Air-fuel ratio (AFR) control is important for the exhaust emission reduction while using the three-way catalytic converter in the spark ignition (SI) engine. However, the transient cylinder air mass is unable to acquire by sensors directly and it may limit the accuracy of AFR control. The complex engine dynamics and working conditions make the intake air estimation a challenge work. In this paper, a novelty design of intake air observer is investigated for the port-injected SI engine. The intake air dynamical modeling and the parameter fitting have been carried out in detail. Extended Kalman Filter (EKF) has been used to optimize the instantaneous cylinder charge estimation and minimize the effort of pump gas fluctuation, random noise, and measurement noise. The experiment validation has been conducted to verify the effectiveness of the proposed method.

scholarly journals Effects of Fuel Additives on Performance and Emission Characteristics of Spark Ignition Engine

2017 ◽  
Vol 2 (3) ◽  
pp. 30 ◽  
Author(s):  
A. Adebayo ◽  
Omojola Awogbemi
Keyword(s):  
Spark Ignition ◽  
Petroleum Products ◽  
Physicochemical Analysis ◽  
Spark Ignition Engine ◽  
Exhaust Emission ◽  
Emission Characteristics ◽  
Si Engine ◽  
Environmental Implications ◽  
Performance And Emission ◽  
Si Engines

This research investigated the effects of addition of ethanol to gasoline with the aim of improving the performance and emission characteristics of Spark Ignition (SI) engine. Four samples of gasoline-ethanol blend were prepared, namely 100% ethanol, 100% gasoline, 95% gasoline + 5% ethanol and 90% gasoline+10% ethanol, and were labeled sample A, B, C and D respectively. Physicochemical analysis was carried out on the four samples while sample B, C, and D were used to run a single cylinder, two stroke, air cooled SI engine to determine the performance characteristics of the engine at four engine speeds of 800rpm, 1000rpm, 1200rpm, and 1400rpm. An exhaust gas analyzer was used to analyze the exhaust emission to determine its constituents at no load. The research concluded that blending gasoline with ethanol not only improved the performance of the engine, it also yielded a friendlier emission. It also solves the problem of sole dependence on petroleum products to run SI engines with its attendant cost and environmental implications.

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