Injection Rate Shaping Investigations on a Small – Bore DI Diesel Engine

Rottmann, Michael; Menne, Christoph; Pischinger, Stefan; Luckhchoura, V.; Peters, N.

doi:10.4271/2009-01-0850

Cited by 19 publications

(13 citation statements)

References 12 publications

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“…A measured rate shape with the CoraRS injector was used for generating different injection-rate shapes. Further details on the experimental setup and on the injection system are given in [14]. Data pertaining to an engine operating point, for which simulations were performed, is used in Table 2.…”

Section: Methodsmentioning

confidence: 99%

“…This point provides confidence in the capabilities of the computational fluid dynamics (CFD) model to simulate the complex phenomena in diesel engines. Although the earlier experimental investigation [14] on rate shapes showed the global affect on engine performance, the detailed timedependent effects of injection rate shaping could not be captured in such experiments. Since injection-rate shaping is, in effect, a temporal change in the injected fuel mass, it is necessary to understand and explain the global results by investigating the transient behaviour of spray, combustion, and pollutant formation.…”

Section: Introductionmentioning

confidence: 91%

“…Their results showed improvement in engine performance due to rate shapes, with boot shapes showing the overall best performance. Engine simulations using the multidimensional flow solver AC-FluX (formerly known as GMTEC) with a representative interactive flamelet (RIF) combustion model have also been performed to capture the effects of different injection-rate shapes [14,15]. Comparing simulation results and trends with experimental results, it can be concluded that the model results can capture the effects caused by different injection-rate shapes (such as its the heat release pattern and the soot-NO x trade-off).…”

Section: Introductionmentioning

confidence: 99%

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Computational analysis of injection-rate shapes in a small-bore direct-injection diesel engine

Luckhchoura

Peters

Diwakar

2011

International Journal of Engine Research

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The purpose of this study is to analyse the differences in the combustion process, and pollutants formation (especially soot) due to top-hat and boot injection-rate shapes at one specific high-load point of a single-cylinder small-bore diesel engine using multidimensional engine simulations. The simulations are performed using a response interactive flamelet model with detailed chemical kinetics. A detailed chemistry-based soot model is used for the prediction of soot emissions. The heights of the first and second stages of the boot shape are varied to observe the effect of the injected fuel mass distribution. In addition, results of boot shapes are compared with a trapezoidal (top-hat) shape. A detailed analysis of soot formation and oxidation is also presented for some selected rate shapes. Through computational analysis it is shown that the boot shapes have the potential to decrease combustion-generated noise and to lower emissions at the investigated load point compared to the top-hat shape. Variations in the temporal distribution of the injected fuel mass show that a lower height of the first stage and a higher height of the second stage of the boot shape result in a relatively slower rise of heat release (lower combustion-generated noise) in the early part of combustion and enhanced soot oxidation as a result of higher spray momentum near the end of injection.

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Section: Methodsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 91%

Section: Introductionmentioning

confidence: 99%

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Computational analysis of injection-rate shapes in a small-bore direct-injection diesel engine

Luckhchoura

Peters

Diwakar

2011

International Journal of Engine Research

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“…and the setpoint profile from equation (4). By applying equation 5, the Seiliger process can be defined with an infinite a value and a PPL that fits to the corresponding Seiliger process.…”

Section: Realised Combustion Processmentioning

confidence: 99%

“…Improvements of exhaust emissions using rate shaping have already been observed. [2][3][4] The present paper outlines the benefits of a combination of injection rate shaping and closed-loop combustion control. Thus, a flexible injection rate-shaping tool (FIRST) developed by FEV GmbH is used (see the later section on injector and system setup).…”

Section: Introductionmentioning

confidence: 99%

Experimental realisation of predefined diesel combustion processes using advanced closed-loop combustion control and injection rate shaping

Hinkelbein

Kremer

Lamping

et al. 2012

International Journal of Engine Research

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In this paper, a combustion control algorithm is presented that, in combination with rate shaping, allows closed-loop control of a cylinder pressure trace. Given this system, it is possible to control the behaviour of the entire combustion process. The paper starts with an explanation of the control algorithm that was developed based on iterative learning control. Consequently, the so-called a-process, which comprises a constant pressure rise, is presented as an example of the additional degrees of freedom gained. Based on the exact analysis of experimental results and combustion simulations, the effects of a peak pressure limitation on the emission behaviour of a single-cylinder engine powered by an a-process are analysed in detail. The capability of the developed control system to isolate certain effects of ideal combustion processes gives a wide range of possible further investigations. However, for practical applications, the use of injection rate shaping is coupled with high hardware costs. Therefore, an additional concept study regarding the possible realisation of the developed control system with a conventional common-rail injector is presented. In this study, it is shown that injectors without rate-shaping capabilities are able to solve the feedback control problem through multiple injection strategies.

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Fuel injection rate shaping and its effect on spray parameters in a direct-injection gasoline system

Pielecha

2022

J Vis

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The presented test results contain an analysis of the variable control of fuel flow from high-pressure gasoline injectors. To control such a system, the cRIO 9063 system and NI-driven module were used. This system allows controlling a piezoelectric injector with a time-varying needle height, which affects the time-varying fuel flow during a single-time opening of the injector needle. The tests were carried out in a constant volume chamber with a constant fuel dose (Pinj = 15 MPa and qo = 17.4 mg), with two values of medium back pressure: Pb = 1.0 and 1.5 MPa as well as different injector opening times (resulting from equal doses of fuel). Analyzes of changes in linear and radial fuel spray range as well as the fuel spray volume were made. It has been found that injection rate-shaping allows to control the fuel flow from the injector at a variable needle height. A reduction of the linear range of the spray by 50% and a radial range by 40% compared to conventional settings within a specified time from the start of the injection was achieved. The surface area of the spray is limited by a maximum of 60% compared to the settings at the maximum control voltage. The use of injection rate-shaping may be an effective method of controlling the variable fuel flow from the injector and may allow the replacement of multi-stage fuel injection. Graphical Abstract

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Injection Rate Shaping Investigations on a Small – Bore DI Diesel Engine

Cited by 19 publications

References 12 publications

Computational analysis of injection-rate shapes in a small-bore direct-injection diesel engine

Computational analysis of injection-rate shapes in a small-bore direct-injection diesel engine

Experimental realisation of predefined diesel combustion processes using advanced closed-loop combustion control and injection rate shaping

Fuel injection rate shaping and its effect on spray parameters in a direct-injection gasoline system

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