Optimal Diesel engine calibration using convex modelling of Pareto frontiers

Dooren, Stijn van; Balerna, Camillo; Salazar, Mauro; Amstutz, Alois; Onder, Christopher H.

doi:10.1016/j.conengprac.2020.104313

Cited by 10 publications

(9 citation statements)

References 16 publications

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“…For conventional vehicles that allow the engine calibration to be varied online, the fuel consumption, engine-out NO x emissions, and exhaust enthalpy can be influenced during operation [10][11][12][13][14][15][16]. In this setting, the task of the supervisory controller is to set the engine operation such that the fuel consumption is minimized while a tailpipe NO x limit is not exceeded.…”

Section: Literature Review: Optimal Powertrain Controlmentioning

confidence: 99%

“…This is likely the reason why, in the literature, a limited number of engine control inputs are considered. A single engine control input was considered in [7], two in [10,11,14], three in [12,15,16], and four in [13].…”

Section: Literature Review: Preoptimization Of Engine Operationmentioning

confidence: 99%

“…To deal with the high-dimensional control problem resulting from considering many engine control inputs, some researchers applied a preoptimization to reduce the dimensionality of the supervisory control problem [14][15][16]. First, a set of objectives is defined for a multi-objective optimization of the engine operation.…”

Section: Literature Review: Preoptimization Of Engine Operationmentioning

confidence: 99%

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Optimal Integrated Emission Management through Variable Engine Calibration

Ritzmann

Chinellato²,

Hütter³

et al. 2021

Energies

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In this work, the potential for improving the trade-off between fuel consumption and tailpipe NOx emissions through variable engine calibration (VEC) is demonstrated for both conventional and hybrid electric vehicles (HEV). First, a preoptimization procedure for the engine operation is proposed to address the challenge posed by the large number of engine control inputs. By excluding infeasible and suboptimal operation offline, an engine model is developed that can be evaluated efficiently during online optimization. Next, dynamic programming is used to find the optimal trade-off between fuel consumption and tailpipe NOx emissions for various vehicle configurations and driving missions. Simulation results show that for a conventional vehicle equipped with VEC and gear optimization run on the worldwide harmonized light vehicles test cycle (WLTC), the fuel consumption can be reduced by 5.4% at equivalent NOx emissions. At equivalent fuel consumption, the NOx emissions can be reduced by 80%. For an HEV, the introduction of VEC, in addition to the optimization of the torque split and the gear selection, drastically extended the achievable trade-off between fuel consumption and tailpipe NOx emissions in simulations. Most notably, the region with very low NOx emissions could only be reached with VEC.

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Section: Literature Review: Optimal Powertrain Controlmentioning

confidence: 99%

Section: Literature Review: Preoptimization Of Engine Operationmentioning

confidence: 99%

Section: Literature Review: Preoptimization Of Engine Operationmentioning

confidence: 99%

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Optimal Integrated Emission Management through Variable Engine Calibration

Ritzmann

Chinellato²,

Hütter³

et al. 2021

Energies

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“…For the engine in this study, the static engine model and model-based calibration were obtained as described in van Dooren et al 23 The control inputs u consist of the amount of fuel injected per cylinder and per cycle m inj , the start-of-injection (SOI) u soi in degrees before top dead centre and the desired burned gas ratio x bg in the intake manifold. While the amount of injected fuel is controlled to reach the requested torque T e ref , the two remaining control inputs u soi and x bg are the degrees of freedom to trade off fuel consumption m · f against engine-out N O x emissions m · N O …”

Section: Engine Model and Model-based Calibrationmentioning

confidence: 99%

Variable smoothing of optimal diesel engine calibration for improved performance and drivability during transient operation

Pandey

Dooren

Ritzmann

et al. 2020

International Journal of Engine Research

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The model-based method to define the optimal calibration maps for important diesel engine parameters may involve three major steps. First, the engine speed and load domain – in which the engine is operated – are identified. Then, a global engine model is created, which can be used for offline simulations to estimate engine performance. Finally, optimal calibration maps are obtained by formulating and solving an optimisation problem, with the goal of minimising fuel consumption while meeting constraints on pollutant emissions. This last step in the calibration process usually involves smoothing of the maps in order to improve drivability. This article presents a method to trade off map smoothness, brake-specific fuel consumption and nitrogen oxide emissions. After calculating the optimal but potentially non-smooth calibration maps, a variation-based smoothing method is employed to obtain different levels of smoothness by adapting a single tuning parameter. The method was experimentally validated on a heavy-duty diesel engine, and the non-road transient cycle was used as a case study. The error between the reference and actual engine torque was used as a metric for drivability, and the error was found to decrease with increasing map smoothness. After having obtained this trade-off for various fixed levels of smoothness, a time-varying smoothness calibration was generated and tested. Experimental results showed that, with a time-varying smoothness strategy, nitrogen oxide emissions could be reduced by 4%, while achieving the same drivability and fuel consumption as in the case of a fixed smoothing strategy.

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“…After that, model-based optimisation techniques are often used to nd an engine calibration that yields the lowest possible fuel consumption while adhering to the limits on pollutant emissions[Hafner & Isermann 2003, Sequenz 2013]. For the engine in this study, the static engine model and model-based calibration were obtained as described in[van Dooren et al 2019]. The control inputs u consist of the amount of fuel injected per cylinder and per cycle m inj , the start-of-injection u soi in degrees before top dead centre, and the desired burned gas ratio x bg in the intake manifold.…”

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confidence: 99%

Online Control of Automotive systems for improved Real-World Performance

Pandey¹

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Optimal Diesel engine calibration using convex modelling of Pareto frontiers

Cited by 10 publications

References 16 publications

Optimal Integrated Emission Management through Variable Engine Calibration

Optimal Integrated Emission Management through Variable Engine Calibration

Variable smoothing of optimal diesel engine calibration for improved performance and drivability during transient operation

Online Control of Automotive systems for improved Real-World Performance

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