Influence of Valve Overlap Strategies on Residual Gas Fraction and Combustion in a Spark-Ignition Engine at Idle

1997 ◽  
Author(s):  
Håkan Sandquist ◽  
Johan Wallesten ◽  
Karin Enwald ◽  
Stefan Strömberg
Keyword(s):  
Spark Ignition ◽  
Spark Ignition Engine ◽  
Residual Gas Fraction ◽  
Residual Gas ◽  
Valve Overlap

scholarly journals Comparative Study of the Effective Release Energy, Residual Gas Fraction, and Emission Characteristics with Various Valve Port Diameter-Bore Ratios (VPD/B) of a Four-Stroke Spark Ignition Engine

Energies ◽  
2020 ◽  
Vol 13 (6) ◽  
pp. 1330 ◽  
Author(s):  
Nguyen Xuan Khoa ◽  
Ocktaeck Lim
Keyword(s):  
Load Condition ◽  
Experimental System ◽  
Optimization Method ◽  
Spark Ignition ◽  
Spark Ignition Engine ◽  
Pressure Increase ◽  
Intake Port ◽  
Exhaust Port ◽  
Residual Gas Fraction ◽  
Residual Gas

In this research, the residual gas, peak firing pressure increase, and effective release energy were completely investigated. To obtain this target, the experimental system is installed with a dynamo system and a simulation model was setup. Through combined experimental and simulation methods, the drawbacks of the hardware optimization method were eliminated. The results of the research show that the valve port diameter-bore ratio (VPD/B) has a significant effect on the residual gas, peak firing pressure increase, and effective release energy of a four-stroke spark ignition engine. In this research, the engine was performed at 3000 rpm and full load condition. Following increased IPD/B ratio of 0.3–0.5. The intake port and exhaust port diameter has a contrary effect on engine volumetric efficiency, the residual gas ratio increase 27.3% with larger intake port and decrease 18.6% with larger exhaust port. The engine will perform optimal thermal efficiency when the trapped residual gas fraction ratio is from 13% to 14%. The maximum effective release energy was 0.45 kJ at 0.4 intake port-bore ratio, and 0.451 kJ at 0.35 exhaust port-bore ratio. The NOx emission increases until achieved a maximum value after that decrease even VPD/B was still increasing. With a VPD/B ratio of 0.35 to 0.4, the engine works without the misfiring.

Air Charge and Residual Gas Fraction Estimation for a Spark-Ignition Engine Using In-Cylinder Pressure

2017 ◽  
Author(s):  
Arya Yazdani ◽  
Jeffrey Naber ◽  
Mahdi Shahbakhti ◽  
Paul Dice ◽  
Chris Glugla ◽  
...  
Keyword(s):  
Spark Ignition ◽  
Spark Ignition Engine ◽  
Cylinder Pressure ◽  
Residual Gas Fraction ◽  
Residual Gas

An Evaluation of Residual Gas Fraction Measurement Techniques in a High Degree of Freedom Spark Ignition Engine

2008 ◽  
Vol 1 (1) ◽  
pp. 71-84 ◽  
Author(s):  
Robert G. Prucka ◽  
Zoran Filipi ◽  
Dennis N. Assanis ◽  
Denise M. Kramer ◽  
Gregory L. Ohl
Keyword(s):  
Measurement Techniques ◽  
Spark Ignition ◽  
Spark Ignition Engine ◽  
Degree Of Freedom ◽  
Residual Gas Fraction ◽  
Residual Gas ◽  
Fraction Measurement ◽  
High Degree

A Model for Predicting Residual Gas Fraction in Spark-Ignition Engines

1993 ◽  
Author(s):  
Jonathan W. Fox ◽  
Wai K. Cheng ◽  
John B. Heywood
Keyword(s):  
Spark Ignition ◽  
Spark Ignition Engines ◽  
Residual Gas Fraction ◽  
Residual Gas

Model-Based Stochastic Optimal Air–Fuel Ratio Control With Residual Gas Fraction of Spark Ignition Engines

2014 ◽  
Vol 22 (3) ◽  
pp. 896-910 ◽  
Author(s):  
Jun Yang ◽  
Tielong Shen ◽  
Xiaohong Jiao
Keyword(s):  
Spark Ignition ◽  
Spark Ignition Engines ◽  
Fuel Ratio ◽  
Model Based ◽  
Residual Gas Fraction ◽  
Residual Gas

Factors influencing the burn rate characteristics of a spark ignition engine with variable valve timing

2008 ◽  
Vol 222 (11) ◽  
pp. 2147-2158 ◽  
Author(s):  
F Bonatesta ◽  
P J Shayler
Keyword(s):  
Mass Fraction ◽  
Spark Ignition ◽  
Spark Ignition Engine ◽  
Variable Valve Timing ◽  
Valve Timing ◽  
Spark Timing ◽  
Piston Speed ◽  
Flame Development ◽  
Variable Valve ◽  
Valve Overlap

The charge burn characteristics of a four-cylinder port-fuel-injected spark ignition engine fitted with a dual independent variable-valve-timing system have been investigated experimentally. The influence of valve timings on the flame development angle and the rapid burn angle is primarily associated with valve overlap values and internal gas recirculation. Conditions examined cover light to medium loads and engine speeds up to 3500r/min. As engine loads and speeds exceeded about 6bar net indicated mean effective pressure and 3000r/min respectively, combustion duration was virtually independent of the valve timing setting. At lower speeds and work output conditions, valve timing influenced burn angles through changes in dilution mass fraction, charge density, and charge temperature. Of these, changes in dilution mass fraction had the greatest influence. Increasing the dilution by increasing the valve overlap produced an increase in both burn angles. The effects of mean piston speed and spark timing have also been examined, and empirical expressions for the flame development and the rapid burn angles are presented.

Model-Based Dynamic In-Cylinder Air Charge, Residual Gas and Temperature Estimation for a GDI Spark Ignition Engine Using Cylinder, Intake and Exhaust Pressures

2020 ◽  
Author(s):  
Amir Khameneian ◽  
Xin Wang ◽  
Paul Dice ◽  
Mahdi Shahbakhti ◽  
Jefferey D. Naber ◽  
...  
Keyword(s):  
Steady State ◽  
Gas Flow ◽  
Transient Behavior ◽  
Spark Ignition ◽  
Ideal Gas ◽  
Spark Ignition Engine ◽  
Exhaust Gas ◽  
Engine Operation ◽  
Trapped Air ◽  
Residual Gas

Abstract The in-cylinder trapped air, residual gas, and temperature directly impact Spark Ignition (SI) engine operation and control. However, estimation of these variables dynamically is difficult. This study proposes a dynamic cycle-by-cycle model for estimation of the in-cylinder mixture temperature at different events such as Intake Valve Closed (IVC), as well as mass of trapped air and residual gas. In-cylinder, intake and exhaust pressure traces are the primary inputs to the model. The mass of trapped residual gas is affected by valve overlap increase due to the exhaust gas backflow. Of importance to engines with Variable Valve Timing (VVT), the compressible ideal-gas flow correlations were applied to predict the exhaust gas backflow into the cylinder. Furthermore, 1D GT-Power Three Pressure Analysis (TPA) was used to calibrate and validate the designed model under steady-state conditions. To minimize the calibration efforts, Design of Experiments (DOE) analysis methodology was used. The transient behavior of the model was validated using dynamometer dynamic driving cycle. The cycle-based output parameters of the developed model are in good agreement with transient experimental data with minimal delay and overshoot. The predicted parameters follow the input dynamics propagated in the in-cylinder, intake and exhaust pressure traces with a 1.5% average relative steady-state prediction error.

Exergy evaluation of equivalence ratio, compression ratio and residual gas effects in variable compression ratio spark-ignition engine using quasi-dimensional combustion modeling

Energy ◽  
2022 ◽  
pp. 123080
Author(s):  
Constantine D. Rakopoulos ◽  
Dimitrios C. Rakopoulos ◽  
Dimitrios C. Kyritsis ◽  
Eleftherios C. Andritsakis ◽  
George C. Mavropoulos
Keyword(s):  
Compression Ratio ◽  
Equivalence Ratio ◽  
Spark Ignition ◽  
Spark Ignition Engine ◽  
Variable Compression Ratio ◽  
Combustion Modeling ◽  
Residual Gas ◽  
Variable Compression
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