Investigation of Acceleration of Turbocharged Diesel Engine

2001 ◽  
Author(s):  
Ales Hribernik ◽  
Gorazd Bombek ◽  
Ferdinand Trenc
Keyword(s):  
Diesel Engine ◽  
Engine Speed ◽  
Time History ◽  
Boost Pressure ◽  
Turbocharged Diesel Engine ◽  
Engine Simulation ◽  
Pressure Time ◽  
Acceleration Model ◽  
Non Linear ◽  
Comparison Of The Results

Abstract Acceleration of a 4-cylinder, 7-litre, turbocharged diesel engine has been investigated by the means of experimental and analytical procedure. The engine acceleration on a test stand has been tested using standard dynamometer which has been controlled by a computer. All measurements have been performed at the maximum fuel rack position, however the courses of engine load have been varied. Engine speed, dynamometer load, in-cylinder pressure and boost pressure-time history, have been measured during acceleration in order to acquire the data for validation of engine acceleration model. A non-linear, transient, multi-cylinder, turbocharged, diesel engine simulation has been developed for predictions of instantaneous engine and turbocharger speed and torque. The foundation of the model is a thermodynamic, steady state diesel engine simulation. The transient extension of the original model represents the diesel engine as a non-linear, dynamic system. The predictions of engine simulation model agree fairly well with experimental results and may be used for case studies of engine acceleration. As an example the model has been used to study the influence of manifold-pressure compensator (LDA-system) on the acceleration of turbocharged diesel engine. The original LDA-system has been modified and the comparison of the results predicted by the application of original and modified LDA system has been done.

A Nonlinear, Transient, Single-Cylinder Diesel Engine Simulation for Predictions of Instantaneous Engine Speed and Torque

2000 ◽  
Vol 123 (4) ◽  
pp. 951-959 ◽  
Author(s):  
Z. S. Filipi ◽  
D. N. Assanis
Keyword(s):  
Diesel Engine ◽  
Angular Velocity ◽  
Engine Speed ◽  
Shaft Speed ◽  
Engine Operation ◽  
Transient Model ◽  
Velocity Fluctuations ◽  
Single Cylinder ◽  
Engine Simulation ◽  
Non Linear

A non-linear, transient, single-cylinder diesel engine simulation has been developed for predictions of instantaneous engine speed and torque. The foundation of our model is a physically based, thermodynamic, steady-state diesel engine simulation (Assanis, D. N., and Heywood, J. B., 1986, “Development and Use of a Computer Simulation of the Turbocompounded Diesel System for Engine Performance and Component Heat Transfer Studies,” SAE Paper 860329), which has been comprehensively validated for various engine designs. The transient extension of the parent model represents the diesel engine as a non-linear, dynamic system. The instantaneous crank-shaft speed is determined from the solution of the engine-external load dynamics equation, where the engine torque is tracked on a crank-angle basis. Validation of the transient model during rapid engine acceleration shows that both the cyclic fluctuations in the instantaneous crank-shaft speed line and the overall engine response are in good agreement with experimental measurements. Predictions of single-cylinder engine starting reveals the importance of selecting the proper value of the engine moment of inertia in order to control the amplitude of angular velocity fluctuations and ensure stable engine operation. It is further shown that the variation in the inertial forces on the reciprocating components with speed has a dramatic impact on the instantaneous torque profile, and consequently on angular velocity fluctuations.

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.

Emission Performance of a Diesel Engine with Pressure-Wave Supercharger

2011 ◽  
Vol 383-390 ◽  
pp. 6168-6173
Author(s):  
Yan Lei ◽  
Hong Guang Zhang ◽  
Da Sen Zhou ◽  
Xiao Lei Bai
Keyword(s):  
Diesel Engine ◽  
Experimental Test ◽  
Pressure Wave ◽  
Engine Speed ◽  
3D Model ◽  
Cfd Simulation ◽  
Test Results ◽  
Turbocharged Diesel Engine ◽  
Emission Performance ◽  
Simulation Results

Pressure-wave supercharger (PWS) is one technical way to boost the engine intake air pressure. PWS has several advantages such as less emission (especially NOx emission), rapid response when load changes, higher torque even at low engine speed. In this research a 493 diesel engine is charged by a pressure-wave supercharger (PWS). The emission performance of the PWS diesel engine is mainly investigated. Together with experimental test, the CFD simulation is completed basing on a 3D model of the PWS rotor channel. The CFD simulation results show that the inner EGR phenomenon happens especially when PWS runs at middle PWS rotational speed with part load. The test results demonstrate that the PWS diesel engine performs well with less NOx and soot emissions than the turbocharged diesel engine.

Grey Theory Approach to Sequential Turbocharged Diesel Engine

2007 ◽  
Vol 10-12 ◽  
pp. 934-938
Author(s):  
Peng Qi Zhang ◽  
Jian Wei Du ◽  
Yin Yan Wang
Keyword(s):  
Diesel Engine ◽  
Uncertain System ◽  
Forecast Model ◽  
Grey System Theory ◽  
Grey Theory ◽  
Boost Pressure ◽  
Theory Approach ◽  
Good Precision ◽  
Grey System ◽  
Turbocharged Diesel Engine

In order to ensure diesel engine operating reliably, need to forecast the performance parameters of diesel engine. Grey system theory, a method to research poor information and uncertain system, was approached to sequential turbocharged diesel engine. Grey forecast model of boost pressure of sequential turbocharged diesel engine was established. The precision of the forecast model was inspected by grey relation analysis, it is proved that the model has a good precision and is suitable to forecasting boost pressure. The relatively error of the forecast result is 2.5%. And it establishes the base for forecasting control and failure prediction of diesel engine sequential turbocharging system.

Pollutant Reduction of a Turbocharged Diesel Engine Using a Decentralized Mimo Crone Controller

2015 ◽  
Vol 18 (2) ◽  
Author(s):  
Abderrahim Lamara ◽  
Guillaume Colin ◽  
Patrick Lanusse ◽  
Alain Charlet ◽  
Dominique Nelson-Gruel ◽  
...  
Keyword(s):  
Control System ◽  
Diesel Engine ◽  
Robust Control ◽  
Pollutant Emission ◽  
Circulation System ◽  
Experimental Plant ◽  
Boost Pressure ◽  
Turbocharged Diesel Engine ◽  
Pollutant Reduction ◽  
Operating Points

AbstractThis paper presents a frequency-domain methodology for robust systemcontrol design, and its application in airpath control of a real turbocharged Diesel engine with intake throttle and exhaust gas re-circulation system. The objective is to find a robust control-system which reduces pollutant emission. The three inputs (throttle, wastegate and EGR valves) and two outputs (airflow and boost pressure) of the airpath make the system complex. AMulti InputMulti Output (MIMO) fractional order approach called CRONE (French abbreviation which means robust control of a non integer order) is used to design a non-square control-system for this non-linear plant. Firstly, a multisine signal is used for the system-identification, the airpath inputs are excited around all operating points in order to find a linear model of the plant. Then, the frequency responses of a defined nominal plant and experimental plant are taken into account to design the MIMO control-system using the CRONE shaping approach which permits to maintain performance and robust stability around a wide set of operating points. Finally, pollutant emission results from a driving cycle in test-bench show the relevance of the proposed approach.

Effects of Load Ratio on Dual-Fuel Engine Operated with Pilot Diesel Fuel and Liquefied Natural Gas

2014 ◽  
Vol 960-961 ◽  
pp. 1389-1393
Author(s):  
Qiang Shi ◽  
Chun Hua Zhang ◽  
Yan Chao Cai ◽  
Ju Xiang Fang
Keyword(s):  
Diesel Engine ◽  
Natural Gas ◽  
Diesel Fuel ◽  
Engine Speed ◽  
Load Ratio ◽  
Liquefied Natural Gas ◽  
Dual Fuel ◽  
Turbocharged Diesel Engine ◽  
Full Load ◽  
Co Emission

In order to study the application of the liquefied natural gas (LNG) on diesel engine, a turbocharged diesel engine was converted into a dual-fuel engine ignited by diesel fuel. The effects of load ratio on fuel economy and emissions of dual-fuel engine were compared and analyzed at engine speed of 1200 r/min, 1600 r/min and 2200 r/min. The experimental results show that, the specific fuel consumption is reduced with the increase of load ratio at different speeds. As the load ratio increases, CO emission of dual-fuel reduces, but it increases slightly at high loads and full load. When the load ratio is less than 40%, HC emission of dual-fuel is reduced significantly with the increase of load, but increases when the load ratio continues to increase, and finally HC emission is stable. When the load ratio is less than 40 %, NOx emission is relatively low, as the load ratio increases, increases sharply, but at high loads and full load, reduces slightly.

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