Mean Value Modeling of a Small Turbocharged Diesel Engine

Jensen, Johanne; Kristensen, Alexander; Sorenson, Spencer C.; Houbak, Niels; Hendricks, Elbert

doi:10.4271/910070

Cited by 204 publications

(171 citation statements)

References 7 publications

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“…As was the case with other similar mappingbased approaches developed in the past [10][11][12][13][14][18][19][20][21][22][23], the context of quasi-linear modeling [24] is, in general, followed.…”

Section: Methodology-engine and Vehicle Modelmentioning

confidence: 99%

Analysis of the Effect of Vehicle, Driving and Road Parameters on the Transient Performance and Emissions of a Turbocharged Truck

Giakoumis

Triantafillou

2018

Energies

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Abstract:In this paper, a fundamental analysis of the effects of various influential parameters on the performance and emissions of a turbocharged truck operating under transient conditions is presented. The results derive from a detailed vehicle model that comprises two parts. The first is an engine performance and emissions module that follows a mapping approach, with experimentally derived correction coefficients employed to account for transient discrepancies; this is then coupled to a comprehensive vehicle model that takes into account various vehicle operation attributes such as gearbox, tires, tire slip, etc. Soot, as well as nitrogen monoxide, are the examined engine-out pollutants, together with fuel consumption and carbon dioxide. The parameters examined are vehicular (mass and gearbox), driving (driver 'aggressiveness' and gear-shift profile) and road (type and grade). From the range of values investigated, the most critical parameters for the emission of NO and soot are vehicle mass, driving 'aggressiveness' and the exact gear-change profile. Vehicle mass, driving 'aggressiveness' and road-grade were identified as the most influential parameters for the emission of CO 2 . A notable statistical correlation was established between pollutant emissions (NO, soot) and vehicle mass or road-tire friction, as well as between fueling/CO 2 and vehicle mass, road-tire friction and road grade. It is believed that the results obtained shed light into the effect of critical operating parameters on the engine-out emissions of a truck/bus, underlining at the same time the peculiarities of transient operating conditions.

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Section: Methodology-engine and Vehicle Modelmentioning

confidence: 99%

Analysis of the Effect of Vehicle, Driving and Road Parameters on the Transient Performance and Emissions of a Turbocharged Truck

Giakoumis

Triantafillou

2018

Energies

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“…A model of a spark ignited (SI) engines is presented in Hendricks andSorenson (1990), andJensen et al (1991) develops a model for a small turbocharged diesel engine. The SI engine has three states, engine speed and pressure in the intake and exhaust manifold.…”

Section: Engine Modeling and Boost Controlmentioning

confidence: 99%

Modeling and control of actuators and co-surge in turbocharged engines

Thomasson¹

2014

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Paper 1 is reproduced here with permission from IFP Energies nouvelles Paper 2 is reproduced here with permission from IFAC Paper 3 is reproduced here with permission from Elsevier Paper 4 is reproduced here with permission from IFAC The cover: Photo of an electronic throttle, a pneumatic actuator, and a measurement of mass flows during co-surge, illustrating the main topics of the thesis. Typeset with L A T E X 2εPrinted by LiU-Tryck, Linköping, Sweden 2014 i AbstractThe torque response of the engine is important for the driving experience of a vehicle. In spark ignited engines, torque is proportional to the air flow into the cylinders. Controlling torque therefore implies controlling air flow. In modern turbocharged engines, the driver commands are interpreted by an electronic control unit that controls the engine through electromechanical and pneumatic actuators. Air flow to the intake manifold is controlled by an electronic throttle, and a wastegate controls the energy to the turbine, affecting boost pressure and air flow. These actuators and their dynamics affect the torque response and a lot of time is put into calibration of controllers for these actuators. By modeling and understanding the actuator behavior this dynamics can be compensated for, leaving a reduced control problem, which can shorten the calibration time.Electronic throttle servo control is the first problem studied. By constructing a control oriented model for the throttle servo and inverting that model, the resulting controller becomes two static compensators for friction and limp-home nonlinearities, together with a PD-controller. A gain-scheduled I-part is added for robustness to handle model errors. The sensitivity to model errors is studied and a method for tuning the controller is presented. The performance has been evaluated in simulation, in test vehicle, and in a throttle control benchmark.A model for a pneumatic wastegate actuator and solenoid control valve, used for boost pressure control, is presented. The actuator dynamics is shown to be important for the transient boost pressure response. The model is incorporated in a mean value engine model and shown to give accurate description of the transient response. A tuning method for the feedback (PID) part of a boost controller is proposed, based on step responses in wastegate control signal. Together with static feedforward the controller is shown to achieve the desired boost pressure response. Submodels for an advanced boost control system consisting of several vacuum actuators, solenoid valves, a vacuum tank and a vacuum pump are developed. The submodels and integrated system are evaluated on a two stage series sequential turbo system, and control with system voltage disturbance rejection is demonstrated on an engine in a test cell.Turbocharged V-type engines often have two parallel turbochargers, each powered by one bank of cylinders. When the two air paths are connected before the throttle an unwanted oscillation can occur. When the compressors operate close to the surge lin...

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“…Jensen et al [77] studying a small turbocharged diesel engine developed the following relation for the indicated efficiency (a a N a N )(1 a )…”

Section: Quasi-linear Approachmentioning

confidence: 99%

“…Jensen et al [77] modeled the compressor through the use of the dimensionless head and flow rate parameters that were fitted to data provided by the manufacturer. An alternative approach is to simulate the turbocharger turbine as a series of converging-diverging nozzles placed at the exit of the exhaust system in contact with the atmosphere.…”

Section: Frictionmentioning

confidence: 99%

“…[65][66][67][68][69][70][71], or quasi-linear [e.g. [72][73][74][75][76][77][78][79][80][81][82][83] approach have been developed. The studies have concentrated on interesting issues such as effect of VGT [84][85][86], turbocharger match [87], thermal shock in engine structures [88], governor operation [89,90], exhaust emissions [91][92][93][94][95][96][97][98][99], vehicle cooling system [100], effect of compressor surging [101][102][103][104][105][106][107], electrically assisted turbocharging [108][109][110][111], vehicle performance [112]…”

Section: Historical Overviewmentioning

confidence: 99%

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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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Mean Value Modeling of a Small Turbocharged Diesel Engine

Cited by 204 publications

References 7 publications

Analysis of the Effect of Vehicle, Driving and Road Parameters on the Transient Performance and Emissions of a Turbocharged Truck

Analysis of the Effect of Vehicle, Driving and Road Parameters on the Transient Performance and Emissions of a Turbocharged Truck

Modeling and control of actuators and co-surge in turbocharged engines

Review of Thermodynamic Diesel Engine Simulations under Transient Operating Conditions

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