Diesel-Minimal Combustion Control of a Natural Gas-Diesel Engine

Zurbriggen, Florian; Hütter, Ralf; Onder, Christopher H.

doi:10.3390/en9010058

Cited by 22 publications

(14 citation statements)

References 37 publications

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“…The initial mass coefficient S mass does not cast visible influence on peak pressure and temperature values. The Heider-Holhbaum factor S HH is introduced to correct the mass flow of stoichiometric gas leaving the burnt zone, which is originally calculated by the combustion rate ξ and air fuel ratio σ as in Equation (4). The variation ranges of λ ent and S mass are 0.45-1.45 and 0.05-0.30.…”

Section: Boundary Parameters Investigation Of Two-zone Modelmentioning

confidence: 99%

“…Natural Gas (NG) is considered as an appropriate alternative for internal combustion engines due to its cleaner combustion, relative lower cost and rich reserves [1,2]. It is generally applied in the form of mono-or dual-fuel engines, such as spark ignition natural gas engines, natural gas/diesel engines and CNG-H 2 engines [3][4][5]. For spark ignition (SI) natural gas engines, the further thermal efficiency improvement is constrained by a knocking phenomenon that commonly occurs in gas-fueled SI engines [6].…”

Section: Introductionmentioning

confidence: 99%

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A Two-Zone Combustion Model for Knocking Prediction of Marine Natural Gas SI Engines

2018

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The further thermal efficiency improvement of marine natural gas engine is constrained by a knocking phenomenon that commonly occurs in gas-fueled spark-ignited engines. It plays an important role to investigate how the knocking occurs and how to predict it based on the engine simulation model. In this paper, a two-zone model is developed to provide the prediction of knocking performance and NO emission, which is verified by engine test bed data from a transformed marine natural gas spark ignition (SI) engine. Cylindrical division theory is used to describe the shape of the two zones to decrease the computational cost, as well as a basic mechanism for NO concentration calculation. In order to solve the volume balance, three boundary parameters are introduced to determine the initial condition and mass flow between the two zones. Furthermore, boundary parameters' variation and knocking factor (compression ratio and advanced ignition angle) will be discussed under different working conditions. Result shows that the two-zone model has sufficient accuracy in predicting engine performance, NO emission and knocking performance. Both the increasing compression ratio and advanced ignition angle have a promoting effect on knocking probability, knocking timing and knocking intensity. The knocking phenomenon can be avoided in the targeted natural gas SI engine by constraining the compression ratio smaller than 14 and advanced ignition angle later than 30 • before top dead center (BTDC).Energies 2018, 11, 561 2 of 23 Two broad categories of experimental based methods are used to detect the knocking phenomenon in a certain natural gas engine: the former one is based on direct measurement, like an intensified charge coupled detector (ICCD) camera and Laser-induced Fluorescence (LIF) imaging [8,9]; other methods [10,11] are based on indirect measurement such as in-cylinder pressure analysis, cylinder block vibration, exhaust gas temperature, etc. On the other hand, simulation models enable engineers to explore the details comprehensively during the design period in order to determine the best case, saving research time and development cost. In general, numerical simulation of the natural gas engine working process is classified as follows: the mean value model, zero-dimensional model, quasi-dimensional model and multi-dimensional model [12]. The mean value model is not primarily intended for engine development, but it is efficient for integrated system research, thus it is usually based on a large amount of engine test data and has scarcely no ability to predict [13,14]. For knocking prediction simulation models, the main objective is to characterize the end-gas temperature, which has a direct effect on knocking occurring. It is difficult for the zero-dimensional model to achieve this goal since the in-cylinder temperature and species concentrations are assumed to be uniform throughout the cylinder [15]. The multi-dimensional simulation model (or Computational Fluid Dynamics model, CFD) provides most details of in-cylinder para...

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Section: Boundary Parameters Investigation Of Two-zone Modelmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

A Two-Zone Combustion Model for Knocking Prediction of Marine Natural Gas SI Engines

2018

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“…The reference variables are brake mean effective pressure p me , fuel-to-air equivalence ratio φ, center-of-combustion COC, and the rate of the exhaust gas recirculation x EGR . The Diesel injection controller was presented in [32]. Table 3 shows all five relevant independent variables of the system.…”

Section: Engine Controlmentioning

confidence: 99%

“…The center of combustion is held constant throughout all measurements while the start of injection is adapted such that the Diesel usage is minimized. This so-called Diesel-minimal operation was introduced earlier [32]. It leads to a CO 2 -to-HC optimal operation as outlined in Appendix B.…”

Section: Engine Controlmentioning

confidence: 99%

“…The start of injection is controlled by the Diesel-minimal control (DMC) presented in [32]. The start of injection and the duration of injection are thereby controlled in order to achieve two goals: First, hold the combustion phasing at a desired position using feedback control, and second, minimize the amount of Diesel used via an extremum-seeking algorithm.…”

Section: Appendix B2 Start Of Injection (Soi)mentioning

confidence: 99%

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Low-Load Limit in a Diesel-Ignited Gas Engine

et al. 2017

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Abstract:The lean-burn capability of the Diesel-ignited gas engine combined with its potential for high efficiency and low CO 2 emissions makes this engine concept one of the most promising alternative fuel converters for passenger cars. Instead of using a spark plug, the ignition relies on the compression-ignited Diesel fuel providing ignition centers for the homogeneous air-gas mixture. In this study the amount of Diesel is reduced to the minimum amount required for the desired ignition. The low-load operation of such an engine is known to be challenging, as hydrocarbon (HC) emissions rise. The objective of this study is to develop optimal low-load operation strategies for the input variables equivalence ratio and exhaust gas recirculation (EGR) rate. A physical engine model helps to investigate three important limitations, namely maximum acceptable HC emissions, minimal CO 2 reduction, and minimal exhaust gas temperature. An important finding is the fact that the high HC emissions under low-load and lean conditions are a consequence of the inability to raise the gas equivalence ratio resulting in a poor flame propagation. The simulations on the various low-load strategies reveal the conflicting demand of lean combustion with low CO 2 emissions and stoichiometric operation with low HC emissions, as well as the minimal feasible dual-fuel load of 3.2 bar brake mean effective pressure.

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Low-Temperature Combustion Engine Control

Rajasingham

2021

Nonlinear Model Predictive Control of Combustion Engines

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Diesel-Minimal Combustion Control of a Natural Gas-Diesel Engine

Cited by 22 publications

References 37 publications

A Two-Zone Combustion Model for Knocking Prediction of Marine Natural Gas SI Engines

A Two-Zone Combustion Model for Knocking Prediction of Marine Natural Gas SI Engines

Low-Load Limit in a Diesel-Ignited Gas Engine

Low-Temperature Combustion Engine Control

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