Predictive Pressure Control with Multiple Injections

Turesson, Gabriel; Yin, Lianhao; Johansson, Rolf; Tunestål, Per

doi:10.1016/j.ifacol.2018.10.162

Cited by 5 publications

(3 citation statements)

References 10 publications

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“…Reference tracking and disturbance rejection of the combined control is tested and demonstrated with up to three injections. Turesson et al, 12 have developed a control concept which solves a model-predictive control problem for every cycle to predict the fuel injection profile. Hinkelbein et al, 13,14 have proposed alpha process to pre-define the combustion trace and investigated the concept of Combustion Rate Shaping (CRS) where an Iterative Learning Controller (ILC) is used to measure the deviations from the measured cylinder pressure and correspondingly adapt the injection profile.…”

Section: Introductionmentioning

confidence: 99%

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: Introductionmentioning

confidence: 99%

Combustion rate shaping for flex-fuel applications

Srivastava

Schaub

Pischinger

2022

International Journal of Engine Research

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“…Similar results have already been demonstrated for novel combustion concepts such as PCCI (premixed charge compression ignition). [8][9][10][11] Today, several approaches exist that find fuel-optimal injection inputs under given constraints by design of experiments. 10,12 However, because injection timing and duration define an injection, each additional injection increases the degrees of freedom by two.…”

Section: Introductionmentioning

confidence: 99%

“…[8][9][10][11] Today, several approaches exist that find fuel-optimal injection inputs under given constraints by design of experiments. 10,12 However, because injection timing and duration define an injection, each additional injection increases the degrees of freedom by two. The expected upcoming of renewable fuels adds to the calibration time, since for each additional fuel, the combustion calibration needs to be redone.…”

Section: Introductionmentioning

confidence: 99%

Optimal combustion calibration for direct-injection compression-ignition engines using multiple injections

Moretto

Hänggi

Onder

2022

International Journal of Engine Research

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Multiple injections are widely used for direct-injection compression-ignition engines to mainly increase efficiency, lower pollutant emissions, and increase exhaust enthalpy. However, with each additional injection the degrees of freedom increase, which makes finding an optimal injection input by design of experiments a time-consuming task. In this paper, we present a model-based calibration method that determines the number of injections for a predefined set of requirements. First, we derive a zero-dimensional crank-angle-resolved cylinder process model based on first principles. The model includes a fuel injector and requires a low calibration effort. Second, we use this model in an optimal control problem that minimizes the fuel consumption subject to several constraints such as load, maximal pressure, maximal pressure gradient, engine-out temperature, and the limitations of the fuel injector. The optimal injector inputs are used as feedforward control signals on a real engine to validate the simulative results. In general, the experimental results are in good agreement with those obtained in simulations. Finally, we compare our approach to a state-of-the-art method known as pressure reference tracking which consists of two separate steps: the creation of an optimal pressure reference and the tracking by a discrete injector. We show that our method, which combines these two steps in a single optimization problem, results in an increase in indicated efficiency compared to the solution obtained by pressure reference tracking.

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Fundamentals of CI Engine Combustion Control and Modeling

Rajasingham

2021

Nonlinear Model Predictive Control of Combustion Engines

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Predictive Pressure Control with Multiple Injections

Cited by 5 publications

References 10 publications

Combustion rate shaping for flex-fuel applications

Combustion rate shaping for flex-fuel applications

Optimal combustion calibration for direct-injection compression-ignition engines using multiple injections

Fundamentals of CI Engine Combustion Control and Modeling

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