Power-to-Liquids - Kompensation variierender E-Fuel Zusammensetzungen mittels Digital Rate Shaping /Power-to-Liquids - Compensation of Varying E-Fuel Compositions via Digital Rate Shaping

Neumann, Diane; Pischinger, Stefan; Zubel, Marius; Heuser, Benedikt; Thenert, Katharina; Leitner, Werner; Schönen, M.; Schaub, Jean-frédéric; Jorg, Conradt

doi:10.51202/9783186807120-230

Cited by 2 publications

(12 citation statements)

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“…The focus of this publication is on the development and demonstration of the CRS control concept for real-time applications, which is compatible for cycle-to- 20 cycle control and can be easily integrated into a stateof-the-art control unit. The control concept as defined in Neumann et al, 6,21 which has been proven on the test bench and for which a preliminary investigation was carried out on a vehicle, is taken as starting point and worked on for optimal control behaviour. The paper is outlined in two parts.…”

Section: Objectivementioning

confidence: 99%

“…Moreover, investigations in Jo¨rg et al 17 show that the chemical ignition delay doesn't show a significant difference between HT, LT and NTC Path. Thus, the fundamental Arrhenius approach considering gas pressure and oxygen concentration, as also described in Jo¨rg et al, 17 is used for chemical ignition delay modelling as shown in equation (6).…”

Section: Feedforward Control Conceptmentioning

confidence: 99%

“…Thus, there optimized molecular structure also offers the chance to reduce exhaust gas emissions. [6][7][8] However, the increased fuel diversity associated with the use of these alternative fuels adds an additional layer of complexity to the powertrain development and calibration process, resulting in an increase in development time and cost. A range of carbonneutral fuels have been introduced in Refs.…”

Section: Introductionmentioning

confidence: 99%

“…A range of carbonneutral fuels have been introduced in Refs. [4][5][6][7][8] In Neumann et al, 6 it was shown (Figure 1) that the combustion behaviour is significantly different compared to fossil fuels, and conventional map-based control concepts are not ideal to exploit the full potential of these carbon-neutral fuels. This necessitates the application of advanced model-based closed-loop control strategies which can, on the one hand, minimize undesired combustion variations leading to lower efficiencies, higher combustion noise, higher mechanical stress due to higher peak firing pressure etc.…”

Section: Introductionmentioning

confidence: 99%

“…Figure 2. Schematic of alpha process as a flexible in-cylinder pressure trace modified from Hinkelbein et al 13 The CRS concept as defined in Neumann et al 6,20 consists of a model-based feedforward path and a feedback path as shown in Figure 4. The feedforward path calculates the desired injection profile for the given set points via a heat release model, an ignition delay model, a discretizer block and an injector model.…”

Section: Introductionmentioning

confidence: 99%

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Combustion rate shaping for flex-fuel applications

Srivastava

Schaub

Pischinger

2022

International Journal of Engine Research

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Compliance with future greenhouse gas (GHG) and pollutant emissions poses major challenges for the further development of advanced internal combustion engines for light and heavy-duty applications. To meet all standards, the use of synthetic fuels and/or E-Fuels is an important alternative due to their enormous potential in terms of energy density, sustainability and low pollution combustion. However, the increased fuel diversity associated with the use of these alternative fuels adds an additional layer of complexity to the powertrain development and calibration process, resulting in an increase in development time and cost. This necessitates the application of advanced model-based closed-loop control strategies to optimize the fuel- and air-path calibration to make best use of the properties of the different fuels. One potential solution to address the impact of flex-fuel variances on the combustion process is the Combustion Rate Shaping (CRS) concept presented in this paper. It can maintain a desired combustion trace irrespective of fuel variations, hardware drifts and other external factors, thus ensuring optimal combustion. The highest benefit of this control concept comes from its application directly on the engine control unit (ECU) in combination with an in-cylinder measurement. This enables the online real-time control of the combustion, regardless of which fuel is being used. In addition, this also enables optimization and adaption of the fuel- and air-path settings to the used fuel while driving the vehicle. However, so far, the high computational cost of this control concept limits its real-time capability. Therefore, the optimization of the control concept to achieve real-time capability is the focus of this paper. The optimized control strategy is implemented on a demonstrator engine test bench built using a Rapid Control Prototyping (RCP) system. The controller performance is demonstrated both under steady-state and transient operating conditions, and the potential of the concept is demonstrated in several cases such as engine temperature variations, injector drift, individual cylinder balancing, and fuel-variation.

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Section: Objectivementioning

confidence: 99%

Section: Feedforward Control Conceptmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Combustion rate shaping for flex-fuel applications

Srivastava

Schaub

Pischinger

2022

International Journal of Engine Research

View full text Add to dashboard Cite

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Advanced model-based closed-loop combustion control strategies with combustion rate shaping

Srivastava

Schaub

Pischinger

2023

International Journal of Engine Research

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Combustion rate shaping (CRS) is an advanced closed-loop concept which controls the crank-angle resolved combustion trace by adapting the fuel injection profile. The thermodynamic potential of this concept to enable real-time combustion control independent of fuel property variations, injector drift, cylinder tolerances, or changing air-path boundary conditions has already been demonstrated. The highest benefit of this control concept is achieved when it is directly applied on the engine control unit (ECU) in combination with an in-cylinder pressure measurement. This enables online optimization and adaption of the fuel- and air-path settings to the fuel used during vehicle operation. Therefore, the development of a CRS concept with real-time capability has been the main focus so far. To ensure a robust online real-time combustion control, a key development step was the identification of control variables that describe the entire combustion process and only minimally influence each other. For this purpose, the combustion phasing, the combustion gradient and the indicated mean effective pressure have been determined as parameters for the feedback control. However, the stringent requirements for higher efficiencies, emission robustness and combustion noise necessitate the extension of the CRS control concept. Therefore, in this work, the CRS control concept is extended with the aim of realizing a combustion with constant volume pressure increase to the peak firing pressure limit to achieve highest efficiency. In addition, intelligent control of the fuel injection profile is to be used to achieve a combustion temperature for lowest possible NOx raw emissions and a robust combustion noise excitation limitation. The optimized control strategy is implemented on a heavy-duty single cylinder engine test bench using a Rapid Control Prototyping (RCP) system, and the control performance is demonstrated.

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Power-to-Liquids - Kompensation variierender E-Fuel Zusammensetzungen mittels Digital Rate Shaping /Power-to-Liquids - Compensation of Varying E-Fuel Compositions via Digital Rate Shaping

Cited by 2 publications

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Combustion rate shaping for flex-fuel applications

Combustion rate shaping for flex-fuel applications

Advanced model-based closed-loop combustion control strategies with combustion rate shaping

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