Closed-loop control of a dual-fuel engine working with different combustion modes using in-cylinder pressure feedback

Guardiola, Carlos; Plá, Benjamín; Bares, Pau; Barbier, A.

doi:10.1177/1468087419835327

Cited by 21 publications

(15 citation statements)

References 45 publications

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“…This requires accurate coordination of both air and fuel path to achieve the desired in-cylinder conditions. This is also crucial for combustion mode switching to cover the entire load range [6,14]; the diesel-E85 RCCI operation with a maximal gross IMEP between 9 [5,16] and 16.5 bar [17] is found. For a high load operation up to BMEP = 20 bar, conventional dual fuel mode with late injection timing needs to be applied, see e.g., [18].…”

Section: Rcci Control Challengesmentioning

confidence: 96%

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Data-Driven Air-Fuel Path Control Design for Robust RCCI Engine Operation

Verhaegh¹,

Kupper²,

Willems

2022

Energies

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Reactivity controlled compression ignition (RCCI) is a highly efficient and clean combustion concept, which enables the use of a wide range of renewable fuels. Consequently, this promising dual fuel combustion concept is of great interest for realizing climate neutral future transport. RCCI is very sensitive for operating conditions and requires advanced control strategies to guarantee stable and safe operation. For real-world RCCI implementation, we face control challenges related to transients and varying ambient conditions. Currently, a multivariable air–fuel path controller that can guarantee robust RCCI engine operation is lacking. In this work, we present a RCCI engine controller, which combines static decoupling and a diagonal MIMO feedback controller. For control design, a frequency domain-based approach is presented, which explicitly deals with cylinder-to-cylinder variations using data-driven, cylinder-individual combustion models. This approach enables a systematic trade-off between fast and robust performance and gives clear design criteria for stable operation. The performance of the developed multivariable engine controller is demonstrated on a six-cylinder diesel-E85 RCCI engine. From experimental results, it is concluded that the RCCI engine controller accurately tracks the five desired combustion and air path parameters, simultaneously. For the studied transient cycle, this results in 12.8% reduction in NOx emissions and peak in-cylinder pressure rise rates are reduced by 3.8 bar/deg CA. Compared to open-loop control, the stable and safe operating range is increased from 25 °C up to 35 °C intake manifold temperature and maximal load range is increased by 14.7% up to BMEP = 14.8 bar.

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Section: Rcci Control Challengesmentioning

confidence: 96%

“…RCCI control is a relatively new research field and only a few experimental studies have been reported in the open literature up to now [8][9][10][11][12][13][14]. Table 1 summarizes their main control-related characteristics.…”

Section: Rcci Control Challengesmentioning

confidence: 99%

Data-Driven Air-Fuel Path Control Design for Robust RCCI Engine Operation

Verhaegh¹,

Kupper²,

Willems

2022

Energies

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“…While it is common to find studies about the definition of knock and combustion noise indexes in premixed combustion engines and how the control variables would affect them (some additional examples might be found in the literature [44][45][46] ), few of them were dedicated to implement the strategies in a real-time control application. In particular, most of the works that proposed such kind of controller used the MPRR as the limitation value [47][48][49][50] but did not assess the pressure oscillations. Mashkournia et al 51 implemented a controller in an HCCI engine where the knock was detected by a discrete wavelet transform of the pressure oscillations.…”

Section: Introductionmentioning

confidence: 99%

Safe operation of dual-fuel engines using constrained stochastic control

Guardiola

Plá

Bares

et al. 2021

International Journal of Engine Research

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Premixed combustion strategies have the potential to achieve high thermal efficiency and to lower the engine-out emissions such as NOx. However, the combustion is initiated at several kernels which create high pressure gradients inside the cylinder. Similarly to knock in spark ignition engines, these gradients might be responsible of important pressure oscillations with a harmful potential for the engine. This work aims to analyze the in-cylinder pressure oscillations in a dual-fuel combustion engine and to determine the feedback variables, control actuators, and control approach for a safe engine operation. Three combustion modes were examined: fully, highly, and partially premixed, and three indexes were analyzed to characterize the safe operation of the engine: the maximum pressure rise rate, the ringing intensity, and the maximum amplitude of pressure oscillations (MAPO). Results show that operation constraints exclusively based on indicators such as the pressure rise rate are not sufficient for a proper limitation of the in-cylinder pressure oscillations. This paper explores the use of a knock-like controller for maintaining the resonance index magnitude under a predefined limit where the gasoline fraction and the main injection timing were selected as control variables. The proposed strategy shows the ability to maintain the percentage of cycles exceeding the specified limit at a desired threshold at each combustion mode in all the cylinders.

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“…And based on the pressure, combustion parameters, such as start of combustion (SOC), peak pressure, and maximum pressure rise rate, can be identified and used for the feedback control of the combustion process. [1][2][3] However, the measurement of in-cylinder pressure suffers from the harsh environment and cost, which limits its further application in practice.…”

Section: Introductionmentioning

confidence: 99%

Vibration analysis and combustion parameter evaluation of CI engine based on Fourier Decomposition Method

Wang

Yong

2021

International Journal of Engine Research

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As a non-intrusive method for engine working condition detection, the engine surface vibration contains rich information about the combustion process and has great potential for the closed-loop control of engines. However, the measured engine surface vibration signals are usually induced by combustion as well as non-combustion excitations and are difficult to be utilized directly. To evaluate some combustion parameters from engine surface vibration, the tests were carried out on a single-cylinder diesel engine and a new method called Fourier Decomposition Method (FDM) was used to extract combustion induced vibration. Simulated and test results verified the ability of the FDM for engine vibration analysis. Based on the extracted vibration signals, the methods for identifying start of combustion, location of maximum pressure rise rate, and location of peak pressure were proposed. The cycle-by-cycle analysis of the results show that the parameters identified based on vibration and in-cylinder pressure have the similar trends, and it suggests that the proposed FDM-based methods can be used for extracting combustion induced vibrations and identifying the combustion parameters.

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Closed-loop control of a dual-fuel engine working with different combustion modes using in-cylinder pressure feedback

Cited by 21 publications

References 45 publications

Data-Driven Air-Fuel Path Control Design for Robust RCCI Engine Operation

Data-Driven Air-Fuel Path Control Design for Robust RCCI Engine Operation

Safe operation of dual-fuel engines using constrained stochastic control

Vibration analysis and combustion parameter evaluation of CI engine based on Fourier Decomposition Method

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