Turbocharger Dynamics Influence on Optimal Control of Diesel Engine Powered Systems

Nezhadali, Vaheed; Sivertsson, Martin; Eriksson, Lars

doi:10.4271/2014-01-0290

Cited by 8 publications

(7 citation statements)

References 10 publications

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“…Another extension is to enhance the considered ICE properties. Typically, this enhancement would be to include intake manifold pressure as a state and thereby enable more exact modeling of the turbo dynamics' and "smoke-limiter's" effects on the engine response and fuel consumption [40]. Furthermore, the friction losses in the hydraulic units and the transmission subsystem could have an influence on the control in some configurations and may then need to be considered in the control strategy [41].…”

Section: Discussionmentioning

confidence: 99%

Low-Level Control of Hybrid Hydromechanical Transmissions for Heavy Mobile Working Machines

et al. 2019

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Fuel efficiency has become an increasingly important property of heavy mobile working machines. As a result, Hybrid Hydromechanical Transmissions (HMTs) are often considered for the propulsion of these vehicles. The introduction of hybrid HMTs does, however, come with a number of control-related challenges. To date, a great focus in the literature has been on high-level control aspects, concerning optimal utilization of the energy storage medium. In contrast, the main topic of this article is low-level control, with the focus on dynamic response and the ability to realize requested power flows accurately. A static decoupled Multiple-Input-Multiple-Output (MIMO) control strategy, based on a linear model of a general hybrid HMT, is proposed. The strategy is compared to a baseline approach in Hardware-In-the-Loop (HWIL) simulations of a reference wheel loader for two drive cycles. It was found that an important benefit of the decoupled control approach is that the static error caused by the system’s cross-couplings is minimized without introducing integrating elements. This feature, combined with the strategy’s general nature, motivates its use for multiple-mode transmissions in which the transmission configuration changes between the modes.

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Section: Discussionmentioning

confidence: 99%

Low-Level Control of Hybrid Hydromechanical Transmissions for Heavy Mobile Working Machines

et al. 2019

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“…Combined with turbo lag, this function causes a delay from desired fuel input to actual output torque during transients [65]. Detailed studies of the transient effects of the smoke-limiter or control inputs other than injected fuel are not within the scope of this thesis but have, for instance, been studied in [66].…”

Section: Control Of Hybrid Hydromechanical Transmissionsmentioning

confidence: 99%

Control of Hybrid Hydromechanical Transmissions

Larsson

2019

Linköping Studies in Science and Technology. Dissertations

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“…The contribution in Paper 3 [52] is a quantitative and qualitative study of the impact of turbocharger dynamics on the optimal control of diesel powered powertrains. Two different applications, wheel loader and diesel-electric, are studied where the author contributed with the diesel-electric study.…”

Section: Summary and Main Contributions Of The Papers Included In Thementioning

confidence: 99%

“…In C the author performed the dieselelectric study, a publication preliminary to Paper 3 in the dissertation [52]. Publications D and E are preliminary to Paper 2 in the dissertation [90].…”

Section: J Martin Sivertsson and Lars Eriksson Optimal Step Responsementioning

confidence: 99%

Optimal Control of Electrified Powertrains

Sivertsson

2015

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The cover: Front: Formulation and solution of an optimal control problem, coincidentally the benchmark problem in Paper 6. Back: Positive and not so positive exit messages from the solvers used in the dissertation. Typeset with L A T E X 2εPrinted by LiU-Tryck, Linköping, Sweden 2015 i Abstract Vehicle powertrain electrification, i.e. combining the internal combustion engine (ICE) with an electric motor (EM), is a potential way of meeting the increased demands for efficient and low emission transportation, at a price of increased powertrain complexity since more degrees of freedom (DoF) have been introduced. Optimal control is used in a series of studies of how to best exploit the additional DoFs.In a diesel-electric powertrain the absence of a secondary energy storage and mechanical connection between the ICE and the wheels means that all electricity used by the EMs needs to be produced simultaneously by the ICE, whose rotational speed is a DoF. This in combination with the relatively slow dynamics of the turbocharger in the ICE puts high requirements on good transient control.In optimal control studies, accurate models with good extrapolation properties are needed. For this aim two nonlinear physics based models are developed and made available that fulfill these requirements, these are also smooth in the region of interest, to enable gradient based optimization techniques. Using optimal control and one of the developed models, the turbocharger dynamics are shown to have a strong impact on how to control the powertrain and neglecting these can lead to erroneous estimates both in the response of the powertrain as well as how the powertrain should be controlled. Also the objective, whether time or fuel is to be minimized, influences the engine speed-torque path to be used, even though it is shown that the time optimal solution is almost fuel optimal. To increase the freedom of the powertrain control, a small energy storage can be added to assist in the transients. This is shown to be especially useful to decrease the response time of the powertrain, but the manner it is used, depends on the time horizon of the optimal control problem.The resulting optimal control solutions are for certain cases oscillatory when stationary controls would have been expected. This is shown to be neither an artifact of the discretization used nor a result of the modeling assumptions used. Instead it is for the formulated problems actually optimal to use periodic control in certain stationary operating points. Measurements show that the pumping torque is different depending on whether the controls are periodic or constant despite the same average value. Whether this is beneficial or not depends on the operating point and control frequency, but can be predicted using optimal periodic control theory.In hybrid electric vehicles (HEV) the size of the energy storage reduces the impact of poor transient control, since the battery can compensate for the slower dynamics of the ICE. For HEVs the problem instead is how and when to use the b...

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Turbocharger Dynamics Influence on Optimal Control of Diesel Engine Powered Systems

Cited by 8 publications

References 10 publications

Low-Level Control of Hybrid Hydromechanical Transmissions for Heavy Mobile Working Machines

Low-Level Control of Hybrid Hydromechanical Transmissions for Heavy Mobile Working Machines

Control of Hybrid Hydromechanical Transmissions

Optimal Control of Electrified Powertrains

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