COMPUTATIONAL SIMULATION AND EXPERIMENTAL VALIDATION OF A TURBOCHARGED DIESEL ENGINE

2016 ◽  
Vol 78 (6-10) ◽  
Author(s):  
Asrul Syaharani Yusof ◽  
Saiddi Ali Firdaus Mohamed Ishak ◽  
Risby Mohd Sohaimi ◽  
Wan Ali Wan Mat
Keyword(s):  
Diesel Engine ◽  
Computational Simulation ◽  
Computational Modelling ◽  
Engine Performance ◽  
Green Technology ◽  
Predictive Tool ◽  
Turbocharged Diesel Engine ◽  
Engine Model ◽  
Good Agreement ◽  
Engine Power

Requirements for sustainable development and green technology are motivating car manufacturers to produce newer efficient engines with more power and reduce hazardous emissions. The development of modern engines has certain constraints since prototyping phase requires longer time and is costly. Engine computational modelling now becomes a useful approach and can be used as a predictive tool when developing new engine concepts. The aim of this work is to develop and experimentally validate a turbocharged diesel engine model using one-dimensional GT-Power software. The engine performance parameters in terms of power and torque which are dependent to engine speed are being presented. The predicted performance parameter of the engine model is compared with the data obtained during engine dynamometer experiments. The simulation results show that the engine performances such as engine power and torque are in good agreement with the experiment results within the engine rpm range from 2000 rpm to 3000 rpm (with RMS Error for engine power and torque is 10% and 39%).

Computationally Efficient Whole-Engine Model of a Cummins 2007 Turbocharged Diesel Engine

2009 ◽  
Vol 132 (2) ◽  
Author(s):  
Anup M. Kulkarni ◽  
Gregory M. Shaver ◽  
Sriram S. Popuri ◽  
Tim R. Frazier ◽  
Donald W. Stanton
Keyword(s):  
Diesel Engine ◽  
Flow Rate ◽  
Closed Loop ◽  
Engine Performance ◽  
Open Loop ◽  
Operating Conditions ◽  
Nox Emissions ◽  
Computationally Efficient ◽  
Turbocharged Diesel Engine ◽  
Engine Model

This paper describes an accurate, flexible, and computationally efficient whole engine model incorporating a multizone, quasidimension combustion submodel for a 6.7-l six-cylinder turbocharged diesel engine with cooled exhaust gas recirculation (EGR), cooled air, and multiple fuel injections. The engine performance and NOx emissions predicative capability of the model is demonstrated at 22 engine operating conditions. The only model inputs are physical engine control module “control actions,” including injection rates, injection timings, EGR valve position, and variable geometry turbocharger rack position. The model is run using both “open” and “closed” loop control strategies for air/EGR path control, in both cases achieving very good correlation with experimental data. Model outputs include in-cylinder pressure and heat release, torque, combustion timing, brake specific fuel consumption, EGR flow rate, air flow rate, exhaust and intake pressure, and NOx emissions. The model predicts engine performance and emissions with average absolute errors within 5% and 18%, respectively, of true values with “open-loop” air/EGR control, and within 5% and 11% with “closed-loop” air/EGR control. In addition, accurate prediction of the coupling of the in-cylinder combustion and emission-production processes with the boosted, cooled air/EGR gas dynamics is a key characteristic of the model.

Water Addition in Diesel Engine Intake for NOx Reduction: Comparison of Modeling and Experiments

2003 ◽  
Author(s):  
Bhaskar Tamma ◽  
Juan Carlos Alvarez ◽  
Aaron J. Simon
Keyword(s):  
Diesel Engine ◽  
Fuel Efficiency ◽  
Nox Reduction ◽  
Engine Performance ◽  
Thermodynamic Cycle ◽  
Nox Emission ◽  
Water Addition ◽  
Predictive Tool ◽  
Fuel Flow ◽  
Influence Of Water

Reduction in emissions, especially NOx has been the main study of various engine researchers in the light of stringent emission norms. To reduce the time and cost involved in testing these technologies, engine thermodynamic cycle predictive tools are used. The present work uses one such predictive tool (GT Power from Gamma Technologies) for predicting the influence of water addition in a turbocharged 6-cylinder diesel engine intake on engine performance and NOx emissions. The experiments for comparison with modeling included the introduction of liquid water in the engine intake stream, between the compressor and intercooler ranging from 0 to 100% of fuel flow rate. NOx emission reduced linearly with water addition with reduction of 63% with less than 1% penalty on fuel efficiency at 100% water addition. The GT Power model predicted the performance within 5% of experimental data and NOx emission within 10% of the experiments.

Performance and Exhaust Emissions of a Diesel Engine Running With DME

2001 ◽  
Author(s):  
F. Maroteaux ◽  
G. Descombes ◽  
F. Sauton
Keyword(s):  
Diesel Engine ◽  
Engine Performance ◽  
Exhaust Emissions ◽  
Injection Rate ◽  
Combustion Reaction ◽  
Emissions Reduction ◽  
Turbocharged Diesel Engine ◽  
Turbocharging System ◽  
Performance And Emissions ◽  
Thermodynamic Conditions

Abstract This research investigates engine performance and the potential of reducing exhaust emissions by using Dimethyl Ether (DME) which is an alternative fuel for diesel engines. The objective of this study it to evaluate (on the bed test) the performance and emissions reduction potential of an engine running with DME. A 4 cylinder passenger car HSDI Common Rail turbocharged diesel engine without specific modifications was used. The results obtained on this engine running with DME using diesel fuel as reference are encouraging. In the next steps of this study the injection rate will be adapted to DME operation and to the geometric and thermodynamic conditions of the combustion reaction. A study of the combustion reaction is also necessary in order to optimize the turbocharging system to exclusive DME operation.

Assessment of Charge-Air Cooler Health in Diesel Engines Using Nonlinear Time Series Analysis of Intake Manifold Temperature

2009 ◽  
Vol 131 (4) ◽  
Author(s):  
Alok A. Joshi ◽  
Scott James ◽  
Peter Meckl ◽  
Galen King ◽  
Kristofer Jennings
Keyword(s):  
Diesel Engine ◽  
Nearest Neighbor ◽  
Engine Performance ◽  
Local Linear Regression ◽  
Intake Manifold ◽  
Optimal Time ◽  
Boost Pressure ◽  
General Applicability ◽  
Turbocharged Diesel Engine ◽  
Air Cooler

Degradation in the cooling effectiveness of a charge-air cooler (CAC) in a medium-duty turbocharged diesel engine has significant impact on engine performance. This degradation lowers the boost pressure and raises the intake manifold temperature. As a result, the engine provides lower horsepower and higher hydrocarbon levels than the rated values. The objective of this research is to monitor the health of the charge-air cooler by analyzing the intake manifold temperature signal. Experiments were performed on a Cummins ISB series turbocharged diesel engine, a 6-cylinder inline configuration with a 5.9 l displacement volume. Air flowing over the cooler was blocked by varying amounts, while various engine temperatures and pressures were monitored at different torque-speed conditions. Similarly, data were acquired without the introduction of any fault in the engine. For the construction of the manifold temperature trajectory vector, average mutual information estimates and a global false nearest neighbor analysis were used to find the optimal time parameter and embedding dimensions, respectively. The prediction of the healthy temperature vector was done by local linear regression using torque, speed, and their interaction as exogenous variables. Analysis of residuals generated by comparing the predicted healthy temperature vector and the observed temperature vector was successful in detecting the degradation of the charge-air cooler. This degradation was quantified by using box plots and probability density functions of residuals generated by comparing intake manifold temperature of healthy and faulty charge-air coolers. The general applicability of the model was demonstrated by successfully diagnosing a fault in the exhaust gas recirculation cooler of a different engine.

A Theoretical Study of a Variable Compression Ratio Turbocharged Diesel Engine

1992 ◽  
Vol 206 (4) ◽  
pp. 227-238 ◽  
Author(s):  
T J Rychter ◽  
A Teodorczyk ◽  
C R Stone ◽  
H J Leonard ◽  
N Ladommatos ◽  
...  
Keyword(s):  
Diesel Engine ◽  
Compression Ratio ◽  
Engine Performance ◽  
Expansion Ratio ◽  
Combustion Noise ◽  
Connecting Rod ◽  
Turbocharged Diesel Engine ◽  
Variable Compression Ratio ◽  
Engine Simulation ◽  
Variable Compression

A variable compression ratio concept that can give a different expansion ratio to the compression ratio has been evaluated by means of a simulation of a turbocharged diesel engine. The compression ratio is controlled by varying the ratio of the connecting rod length to the crank throw, hence the name variable crank radius/connecting rod length engine (VR/LE). The VR/LE mechanism kinematics have been defined and described, and the compression ratio and expansion ratio have been presented as a function of the eccentric phase angle (αo). A zero-dimensional engine simulation that has been the subject of comprehensive validation has been used as the basis of the VR/LE study. The effect of the compression ratio on the engine performance at fixed loads is presented. The principal benefits are a reduction in fuel consumption at part load of about 2 per cent and a reduction in ignition delay that leads to an estimated 6 dB reduction in combustion noise. The study has been conducted within the assumption of a maximum cylinder pressure of 160 bar.

Torsional Vibration Active Control of a Diesel Engine Based on Adjustment of the Fuel Injection Vector

2012 ◽  
Author(s):  
Ying Huang ◽  
Yongguang Yang ◽  
Fujun Zhang ◽  
Zhenfeng Zhao
Keyword(s):  
Diesel Engine ◽  
Active Control ◽  
Torsional Vibration ◽  
Fuel Injection ◽  
Vibration Suppression ◽  
Engine Performance ◽  
Frequency Characteristics ◽  
Injection System ◽  
Control Individual ◽  
Engine Model

The torsional vibration of a crankshaft greatly affects engine performance, and the control and suppression of such vibration have thus always been a focus of engine research. The introduction of an electronic fuel-injection system for the diesel engine has made it possible to control individual cylinders, thus providing a new way to actively control the torsional vibration of a diesel engine. A V8 diesel engine model for co-simulation between crankshaft dynamics and engine performance was established with GT-SUIT software, and the model was verified by experiment data. The active control of crankshaft torsional vibration of a diesel engine by adjusting the fuel injection vector was simulated. First, the amplitude–frequency and phase–frequency characteristics of the excitation torque under different fuel-injection-vector conditions were analyzed. On the basis of the frequency characteristics, different active vibration-suppression schemes were studied, and the crankshaft vibration suppression effects were compared. The simulation results show that adjusting the fuel injection vector is an effective approach for controlling the torsional vibration of an engine crankshaft.

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