Optimization Method and Simulation Study of a Diesel Engine Using Full Variable Valve Motions

2017 ◽  
Vol 139 (7) ◽  
Author(s):  
Yong Lu ◽  
Daniel B. Olsen
Keyword(s):  
Diesel Engine ◽  
Internal Combustion Engines ◽  
Fuel Efficiency ◽  
Optimization Method ◽  
Simulation Software ◽  
Volumetric Efficiency ◽  
Engine Simulation ◽  
Valve Motion ◽  
Simulation Results ◽  
Variable Valve

Variable valve timing technologies for internal combustion engines are used to improve power, torque, and increase fuel efficiency. Details of a new solution are presented in this paper for optimizing valve motions of a full variable valve actuation (FVVA) system. The optimization is conducted at different speeds by varying full variable valve motion (variable exhaust open angle, intake close angle, velocity of opening and closing, overlap, dwell duration, and lift) parameters simultaneously; the final optimized valve motions of CY4102 diesel engine are given. The CY4102 diesel engine with standard cam drives is used in large quantities in Asia. An optimized electrohydraulic actuation motion used for the FVVA system is presented. The electrohydraulic actuation and optimized valve motions were applied to the CY4102 diesel engine and modeled using gt-power engine simulation software. Advantages in terms of volumetric efficiency, maximum power, brake efficiency, and fuel consumption are compared with baseline results. Simulation results show that brake power is improved between 12.8% and 19.5% and torque is improved by 10%. Brake thermal efficiency and volumetric efficiency also show improvement. Modeling and simulation results show significant advantages of the full variable valve motion over standard cam drives.

Simulation and Experimental Study of a Diesel Engine Based on an Electro-Hydraulic FVVA System Optimization

2019 ◽  
Vol 142 (3) ◽  
Author(s):  
Yong Lu ◽  
Jian Li ◽  
Lijun Xiong ◽  
Bo Li
Keyword(s):  
Internal Combustion Engines ◽  
Fuel Efficiency ◽  
System Optimization ◽  
Experimental Results ◽  
Optimization Strategy ◽  
Nsga Ii ◽  
Engine Simulation ◽  
Simulation Results ◽  
Combined Simulation ◽  
Variable Valve

Abstract Variable valve timing technologies for internal combustion engines are used to improve power, torque, reduce emissions, and increase fuel efficiency. First, the paper presents a new electrohydraulic full variable valve actuator (FVVA) system which can control the seating velocity of engine valve flexibly. Second, based on the NSGA-II genetic algorithm, the paper outlines a multi-objective optimization strategy and designs the parameters of the FVVA system to make the system easier to implement. Third, the paper builds the combined FVVA engine simulation model. The combined simulation and experimental results are executed to validate the designed FVVA engine. The simulation results show that brake power is improved between 1.31% and 4.48% and the torque is improved by 1.32–4.47%. Brake thermal efficiency and volumetric efficiency also show improvement. Experimental results have good agreement with the simulation results. The research results can provide a basis for engine modification design.

Simulation and Experimental Study of a Diesel Engine Based on an Electro-Hydraulic FVVA System

2018 ◽  
Author(s):  
Yong Lu ◽  
Jian Li ◽  
Lijun Xiong ◽  
Bo Li
Keyword(s):  
Internal Combustion Engines ◽  
Fuel Efficiency ◽  
Combustion Engines ◽  
Optimization Strategy ◽  
Nsga Ii ◽  
Engine Simulation ◽  
Simulation Results ◽  
Combined Simulation ◽  
Reduce Emissions ◽  
Variable Valve

Variable valve timing technologies for internal combustion engines are used to improve power, torque, reduce emissions and increase fuel efficiency. Firstly, the paper presents a new electrohydraulic FVVA system which can control the seating velocity of engine valve flexibly. Secondly, based on the NSGA-II genetic algorithm, outlines multi-objective optimization strategy, the paper designs the parameters of FVVA system to make the system easier to implement. Thirdly, the paper builds the combined FVVA engine simulation model. The combined simulation and experimental are executed to validate the designed FVVA engine. Simulation results show brake power is improved between 1.31% and 4.48% and torque is improved by 1.32% to 4.47%. Brake thermal efficiency and volumetric efficiency also show improvement. Experimental results have good agreement with simulation results. The research results can provide a basis for engine modification design.

Variable Valve Timing (VVT) Modelling by Lotus Engine Simulation Software

2021 ◽  
Vol 17 (4) ◽  
Author(s):  
Mohammed Kadhim Allawi ◽  
Mohanad Kadhim Mejbel ◽  
Mahmood Hasan Oudah
Keyword(s):  
Fuel Consumption ◽  
Internal Combustion Engines ◽  
Simulation Software ◽  
Valve Lift ◽  
Variable Valve Timing ◽  
Valve Timing ◽  
Engine Simulation ◽  
Engineering Software ◽  
And Performance ◽  
Variable Valve

Variable valve timing (VVT) is an advanced modern technique applied in internal combustion engines by altering the valve lift event timing. This work aims to contribute to the continuing industrial VVT development to improve engine efficiency, fuel consumption and performance. To observe the influence on the spark-ignition (SI) engine’s performance, four valve timing strategies are selected carefully by varying the intake and exhaust valve timing. Lotus Engine Simulation, a simulation engineering software, is adapted in this study. The engine characteristics used in this modelling are spark engine, multicylinder, four strokes, port injection fuel system and constant compression ratio. A comparison between a conventional standard exhaust/intake valve timing and three other different timing cases is carried out. Results reveal that the overlap case of 98° showed a good brake-specific fuel consumption by approximately 3% less than the conventional case. An improvement of 6.2% for volume efficiency and 2.9% in brake thermal efficiency is also reported.

Diesel engine performance at the intake of the hydrogen&air mixture

2021 ◽  
pp. 119-126
Author(s):  
Keyword(s):  
Diesel Engine ◽  
Diesel Fuel ◽  
Internal Combustion Engines ◽  
Fuel Efficiency ◽  
Experimental Studies ◽  
Motor Fuel ◽  
Engine Performance ◽  
Calorific Value ◽  
Hydrocarbon Emissions ◽  
The Difference

The prospects of using hydrogen as a motor fuel are noted. The problems that arise when converting a diesel engine to run on hydrogen are considered. The features of the organization of the working process of enginesrunning on hydrogen are analyzed. A method of supplying a hydrogenair mixture to a diesel engine is investigated. To supply hydrogen to the engine cylinders, it is proposed to use the Leader4M installation developed by TechnoHill Club LLC (Moscow). Experimental studies of a stationary diesel engine of the D245.12 S type with the supply of hydrogen at the inlet obtained at this installation are carried out. At the maximum power mode, the supply of hydrogen from this installation to the inlet of the diesel engine under study was 0.9 % by weight (taking into account the difference in the calorific value of oil diesel fuel and hydrogen). Such a supply of hydrogen in the specified mode made it possible to increase the fuel efficiency of the diesel engine and reduce the smoke content of exhaust gases, carbon monoxide and unburned hydrocarbon emissions. Keywords internal combustion engines; diesel engine; diesel fuel; hydrogen; hydrogenair mixture; fuel efficiency; exhaust gas toxicity indicators

The Co-Simulation Study on Electronic Unit Pump Diesel in Mechanical Engineering

2013 ◽  
Vol 644 ◽  
pp. 317-320
Author(s):  
Chang Xi Ji ◽  
Yu Rong Jiang ◽  
En Zhe Song ◽  
Mei Liang Yin ◽  
Jun Sun
Keyword(s):  
Diesel Engine ◽  
Theoretical Basis ◽  
Theoretical Study ◽  
Simulation Method ◽  
Simulation Software ◽  
Electronic Unit ◽  
Matlab Simulink ◽  
Simulink Simulation ◽  
Electronic Unit Pump ◽  
Simulation Results

This paper establishes the simulation model of the electronic unit pump diesel engine with Matlab/Simulink and AMESim. Provide a theoretical basis for the study of electronic unit pump diesel. The diesel model is built with Matlab/Simulink simulation software and the electronic unit pump is constructed in AMESim environment. To evaluate the model, a co-simulation method with AMESim/Simulink is used. The simulation results show the model is available. And it is significant in theoretical study of electronic unit pump diesel.

Modeling of Variable Intake Valve Timing in SI Engine

2006 ◽  
Author(s):  
S. Ahmad Ghazi Mir Saied ◽  
S. Ali Jazayeri ◽  
Amir H. Shamekhi
Keyword(s):  
Internal Combustion Engines ◽  
Operating Conditions ◽  
Volumetric Efficiency ◽  
Major Influence ◽  
Combustion Engines ◽  
Intake Valve ◽  
Si Engine ◽  
Operating Condition ◽  
Valve Motion ◽  
Engine Map

In internal combustion engines valve events and timings are among the most important parameters which have a major influence on the engine’s operation and volumetric efficiency. By using camless valvetrain strategy, improvement in fuel economy as well as an increase in entering air charge is found throughout the engine map with the largest benefits arising from low speed operating conditions. The system offers a continuously variable and independent control of virtually all parameters of valve motion. This permits optimization of valve events for each operating condition without any compromise. In this paper we describe a phenomenological model for an unthrottled operation of a camless intake process of spark-ignited (SI) engine. Initially the cylinder breathing dynamics is modeled and results are validated with experimental data of a conventional engine with cam-driven valve profile during unthrottled operation. Then we determine the most optimized intake valve profile in order to have the most volumetric efficiency and proper operation for each operating condition based on the existing model and using numerical techniques.

Study on EGR Control Strategy for Vehicle Diesel Engine Based on Experiment

2012 ◽  
Vol 490-495 ◽  
pp. 1491-1495
Author(s):  
Yong Feng Liu ◽  
Pu Cheng Pei ◽  
Jian Wei Yang ◽  
Ai Hua Zhu
Keyword(s):  
Diesel Engine ◽  
Oxygen Concentration ◽  
Control Strategy ◽  
Calculation Model ◽  
Simulation Software ◽  
Maximum Pressure ◽  
Inlet Temperature ◽  
Engine Control ◽  
Simulation Results ◽  
Close Loop Control

To carry out electronic control EGR strategy in diesel engine the calculation model using GT-POWER is built. The thesis uses simulation software GT-POWER to establish the calculation model of 4JB1 intake system of turbocharged diesel engine with EGR system and the results agree well. According to the simulation results, it can predict the main performance indicators of the diesel engine when it works at the maximum torque condition, which includes A/F, IMEP, Maximum Pressure, and Intake Pressure and so on. Then after controlling the volume of gas by modifying the EGR valve, it can find out the regulation how EGR effects the engine's emissions, torque, power and the inlet temperature of turbo. Referring to the simulation results, it includes from four aspects：EGR can significantly improve the quality of emission gas; NOx and PM have a trade-off relationship; applying higher EGR rate in heavy load can lead to the low torque and power less; the inlet temperature of turbo increases with the augment of EGR rate. In the experiment, the inlet oxygen concentration method is used to determine the EGR rate, and to realize it, the oxygen concentration detection module is also successful designed. Then a close-loop control strategy is proposed based on the EGR rate. It proves it is feasible to guide the ECU programmer development by the simulation results of engine control strategy. It is also can be referred by other engine control systems development.

Comparisons of Combustion Simulations Using a Representative Interactive Flamelet Model and Direct Integration of CFD With Detailed Chemistry

2005 ◽  
Author(s):  
Song-Charng Kong ◽  
Hoojoong Kim ◽  
Rolf D. Reitz ◽  
Yongmo Kim
Keyword(s):  
Diesel Engine ◽  
Chemical Reactions ◽  
Direct Integration ◽  
Computational Cell ◽  
Flamelet Model ◽  
Detailed Chemistry ◽  
Engine Simulation ◽  
Integration Approach ◽  
Simulation Results ◽  
Release Data

Diesel engine simulation results using two different combustion models are presented in this study, namely the Representative Interactive Flamelet (RIF) model and the direct integration of CFD and CHEMKIN. Both models have been implemented into an improved version of the KIVA code. The KIVA/RIF model uses a single flamelet approach and also considers the effects of vaporization on turbulence-chemistry interactions. The KIVA/CHEMKIN model uses a direct integration approach that solves for the chemical reactions in each computational cell. The above two models are applied to simulate combustion and emissions in diesel engines with comparable results. Detailed comparisons of predicted heat release data and in-cylinder flows also indicate that both models predict very similar combustion characteristics. This is likely due to the fact that after ignition, combustion rates are mixing controlled rather than chemistry controlled under the diesel conditions studied.

On the Use of VVT Strategy for the Maximum Volumetric Efficiency in Turbocharged Diesel Engines

2006 ◽  
Author(s):  
S. Ahmad Ghazi Mir Saied ◽  
Amir H. Shamdani ◽  
Amir H. Shamekhi
Keyword(s):  
Diesel Engine ◽  
Diesel Engines ◽  
Mass Conservation ◽  
Management Control ◽  
Volumetric Efficiency ◽  
Valve Train ◽  
Intake Manifold ◽  
Power Performance ◽  
Optimal Control Strategy ◽  
Variable Valve

This paper presents a variable valve lifting methodology for turbocharged diesel engines. For this purpose, the diesel engine is modeled based on a modified mean-value engine modeling. An optimal control strategy is used for maximum volumetric efficiency acquirement. Using camless valve train strategy makes better fuel economy and improved air intake characteristics throughout the engine operating map. The system is capable of continuously, independently and virtually controlling all standard parameters of variable valve motion. This permits optimization of valve events for any operating condition without compromise. The optimized intake valve profile is determined, to have the best volumetric efficiency and proper operation for each running condition based on the existing model make use of numerical techniques. The model used in this paper is validated using simulation results of references. The model treats the cylinder and the manifolds as thermodynamic control volumes by using the filling and emptying method, solving energy and mass conservation equations with sub models for intake manifold, variable valve timing, cylinder breathing dynamics and turbocharger including turbine and compressor. This model is a crank angle based dynamic nonlinear model of a four-cylinder turbocharged (TC) diesel engine, which captures the interactions among the VVT actuation, the turbocharger dynamics and the cylinder-to-cylinder breathing characteristics. The model have been implemented in Matlab/Simulink and tested. This work shows the results obtained for air management control in a turbocharged diesel engine, specifically, manifold pressure and air mass flow. These variables are often required to achieve better power performance and lower emissions.

ME´RIME´E: A Simulation Software to Study Diesel Engines Used for Military Propulsion

2002 ◽  
Author(s):  
Xavier Tauzia ◽  
Pascal Chesse ◽  
Jean-Franc¸ois Hetet ◽  
Arnaud Bonin
Keyword(s):  
Internal Combustion Engines ◽  
Test Bench ◽  
Simulation Software ◽  
Pollutant Emissions ◽  
Combustion Engines ◽  
Ground Vehicles ◽  
Simulation Code ◽  
Engine Simulation ◽  
Computer Research ◽  
Second Category

The design and development of internal combustion engines, and by extension of complete powertrains for ground vehicles, constitute a particularly complex, costly and time consuming task. As a result, numerical simulation is now commonly used by engine manufacturers and vehicle designers in addition to test bench experiments. Engine simulation codes can be divided into three main categories, with very different objectives and levels of complexity: CFD codes, thermodynamic codes and real time codes. This paper presents the MERIMEE simulation code, which belongs to the second category (MERIMEE is the French acronym for Computer Research and Study Model for Engines and their Equipment). Jointly developed by Ecole Centrale de Nantes (for the models) and the CS-SI Company (for the software development) it is used by ETAS (French Army) for the development and study of complete powertrains designed for military ground propulsion. The main models used to simulate the engine behavior are first briefly described. Then, the software architecture, the interface as well as the programming and numerical aspects are described. Finally, some significant results are shown and compared with experimental data. They deal with steady state and transient engine behavior in addition to the evaluation of pollutant emissions.

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