Transient Performance Simulation and Analysis of Turbocharged Diesel Engines

Watson, N.

doi:10.4271/810338

Cited by 87 publications

(47 citation statements)

References 10 publications

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“…Transient diesel engine modelling extends from quasilinear codes [1,2], where use is made of experimental data at steady-state conditions together with dynamic equations for the engine, turbocharger and governor, to more fundamental works, where the simulation is based on a detailed thermodynamic (per degree crank angle) analysis [3][4][5][6][7][8]. Here, the governor is modelled using a second order differential equation, while each cylinder in a multi-cylinder engine is assumed to behave in exactly the same way.…”

Section: Introductionmentioning

confidence: 99%

The Effect of Various Dynamic, Thermodynamic and Design Parameters on the Performance of a Turbocharged Diesel Engine Operating under Transient Load Conditions

Rakopoulos¹,

Giakoumis²,

Hountalas³

et al. 2004

SAE Technical Paper Series

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Thermodynamic, dynamic and design parameters have a significant and often conflicting impact on the transient response of a compression ignition engine. Knowing the contribution of each parameter on transient operation could direct the designer to the appropriate measures for better engine performance. To this aim an explicit simulation program developed is used to study the performance of a turbocharged diesel engine operating under transient load conditions. The simulation developed, based on the filling and emptying approach, provides various innovations as follows: Detailed analysis of thermodynamic and dynamic differential equations, on a degree crank angle basis, accounting for the continuously changing nature of transient operation, analysis of transient mechanical friction, and also a detailed mathematical simulation of the fuel pump. Each equation in the model is solved separately for every cylinder of the 6-cylinder diesel engine considered. The model is validated against experimental data for various load changes.The effect of several dynamic, thermodynamic and design parameters is studied, i.e. load schedule (type, and duration of load applied), turbocharger mass moment of inertia, exhaust manifold volume and configuration, cylinder wall temperature, aftercooler effectiveness as well as an interesting case of a malfunctioning fuel pump.Explicit diagrams are given to show how, after an increase in load, each parameter examined affects the engine speed response, as well as other properties of the engine and turbocharger such as fuel pump rack position, boost pressure and turbocharger speed.It is shown that certain parameters, such as the type of connected loading, the turbocharger inertia, a damaged fuel pump and the exhaust manifold volume, can have a significant effect on the engine and turbocharger transient performance. However others, such as the cylinder wall temperature, the aftercooler effectiveness and the exhaust manifold configuration have a less important effect as regards transient response and final equilibrium conditions.

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Section: Introductionmentioning

confidence: 99%

The Effect of Various Dynamic, Thermodynamic and Design Parameters on the Performance of a Turbocharged Diesel Engine Operating under Transient Load Conditions

Rakopoulos¹,

Giakoumis²,

Hountalas³

et al. 2004

SAE Technical Paper Series

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show abstract

“…The model is based on the solution of a system composed of "n" differentia equations for the piston part and six equations describing the processes in the exhaust manifold in the case of pulsatory supercharging system. The same principles were applied in the mathematical models of transient processes in diesel engines presented in [60,62]. It should be noted, however, that the applicability of these models is rather limited in solving optimisation tasks.…”

Section: Mathematical Model Of Diesel Locomotive Enginementioning

confidence: 99%

Diesel locomotive efficiency and reliability improvement as a result of power unit load control system modernisation

Babeł¹,

Szkoda²

2016

EiN

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Diesel locomotive efficiency anD reliability improvement as a result of power unit loaD control system moDernisation poprawa efektywności i niezawoDności lokomotyw spalinowych w wyniku moDernizacji ukłaDu sterowania obciążeniem zespołu napęDowego* BABeł M, SzkodA M. diesel locomotive efficiency and reliability improvement as a result of power unit load control system modernisation. eksploatacja i Niezawodnosc -Maintenance and Reliability 2016; 18 (1): 38-49, http://dx

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“…The sensitivity of transient operation predictions to friction modeling errors was first investigated by Watson [24]. He showed that a (rather exaggerated) 50% overestimation in friction torque could lead to an almost equal increase in predicted final engine speed drop.…”

Section: Frictionmentioning

confidence: 99%

“…Extensive parametric study was also conducted mainly as regards improvement in engine and turbocharger response [21][22][23]. Various limitations of the modeling techniques were discussed in [24], and two-stage turbocharging was proposed as one of possible methods for smoothing turbocharger lag [25].…”

Section: Historical Overviewmentioning

confidence: 99%

Review of Thermodynamic Diesel Engine Simulations under Transient Operating Conditions

Rakopoulos¹,

Giakoumis²

2006

SAE Technical Paper Series

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Study and modeling of transient operation is an important scientific objective. This is due to the fact that the majority of daily vehicle driving conditions involve transient operation, with non-linear situations experienced during engine transients. Thus, proper interconnection is needed between engine, governor, fuel pump, turbocharger and load. This paper surveys the publications available in the open literature concerning diesel engine simulations under transient operating conditions. Only those models that include both full engine thermodynamic calculations and dynamic powertrain modeling are taken into account, excluding those that focus on control design and optimization. Most of the attention is concentrated to the simulations that follow the filling and emptying modeling approach. A historical overview is given covering, in more detail, research groups with continuous and consistent study of transient operation. One of the main purposes of this paper is to summarize basic equations and modeling aspects concerning in-cylinder calculations, friction, turbocharger, engine dynamics, governor, fuel pump operation, and exhaust emissions during transients. The various limitations of the models are discussed together with the main aspects of transient operation (e.g. turbocharger lag, combustion and friction deterioration), which diversify it from the steady-state. Some of the most important findings in the field during the last 30 years are presented and discussed. The survey extends to special cases of transient diesel engine simulation, such as second-law analysis, response when the turbocharger compressor experiences surge, and whole vehicle performance. Several methods of improving transient response are also mentioned, based on the various simulations. An easy-to-read tabulation of all research groups dealing with the subject, that includes details about each model developed and engines/parameters studied, is also provided at the end of the paper.

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Transient Performance Simulation and Analysis of Turbocharged Diesel Engines

Cited by 87 publications

References 10 publications

The Effect of Various Dynamic, Thermodynamic and Design Parameters on the Performance of a Turbocharged Diesel Engine Operating under Transient Load Conditions

The Effect of Various Dynamic, Thermodynamic and Design Parameters on the Performance of a Turbocharged Diesel Engine Operating under Transient Load Conditions

Diesel locomotive efficiency and reliability improvement as a result of power unit load control system modernisation

Review of Thermodynamic Diesel Engine Simulations under Transient Operating Conditions

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