Numerical Investigation of Critical Issues in Multiple-Injection Strategy Operated by a New C.R. Fast-Actuation Solenoid Injector

Bianchi, Gian Marco; Falfari, Stefania; Brusiani, Federico; Pelloni, P.; Osbat, Giovanni; Parotto, Marco

doi:10.4271/2005-01-1236

Cited by 28 publications

(18 citation statements)

References 9 publications

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“…Although common-rail pressure wave oscillation have been reported in the literature, it is generally concluded that the impact of an injection on the consecutive injector is much smaller than the impact of multiple pulses of a given injector; because the dwell time to consecutive injector is large (see e.g. Bianchi et al (2005)). Our experimental observations clearly evidence interactions between injectors.…”

Section: Description Of Phenomenamentioning

confidence: 99%

Model-based temperature control of a diesel oxidation catalyst

Lepreux¹,

Creff²,

Petit³

2012

Journal of Process Control

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To cite this version:Olivier Lepreux. Model-based Temperature Control of a Diesel Oxidation Catalyst . Mathematics T H E S E pour obtenir le grade de DOCTEUR DE L'ECOLE NATIONALE SUPERIEURE DES MINES DE PARIS RésuméLe problème étudié dans cette thèse est la commande d'un système DOC (Diesel Oxidation Catalyst) tel qu'utilisé dans les systèmes de dépollution des gaz d'échappement des moteurs Diesel automobiles.Ce système est par nature un système à paramètres répartis en raison de sa géométrie allongée parcourue par un flux gazeux en contact avec un catalyseur réparti. Après avoir étudié expérimenta-lement ce système, nous avons décidé de prendre en compte cette nature répartie, qui comme on le montre, se retrouve également dans les autres systèmes de dépollution (filtres à particules, pièges à NOx, SCR).Une première contribution du manuscrit consiste en un modèle du système DOC. Celui-ci est obtenu par des simplifications successives, justifiées expérimentalement (observations, estimations des ordres de grandeurs) ou par analyse des équations régissant la dynamique du système (déve-loppements asymptotiques, changements de variables). Ce modèle permet de rendre compte de la complexité de la réponse de la température de sortie du DOC à des variations des grandeurs d'entrée. En particulier, les effets de réponses inverses et de retards sont bien représentés.Une seconde contribution est un ensemble d'algorithmes de commande (précompensation, rétro-action, et synchronisation) permettant de maîtriser les phénomènes thermiques dans le DOC.Ces deux contributions ont été testées expérimentalement et validées. En conclusion, les performances obtenues sont évaluées. En résumé, en utilisant l'approche présentée dans ce manuscrit, il est possible de commander, en conditions réelles, la température de sortie du DOC à ±15 • C. 6 SummaryThe problem studied in this thesis is the control of a DOC (Diesel Oxidation Catalyst) as used in aftertreatment systems of diesel vehicles.This system is inherently a distributed parameter system due to its elongated geometry where a gas stream is in contact with a distributed catalyst. After having studied this system experimentally, we decided to take into account its distributed nature, which as shown, is also found in other aftertreatment devices (particulate filters, NOx traps, SCR).A first contribution of the thesis is a model for the DOC system. It is obtained by successive simplifications justified either experimentally (from observations, estimates of orders of magnitudes) or by an analysis of governing equations (through asymptotic developments, change of variables). This model can account for the complexity of the temperature response of DOC output to changes in input variables. In particular, the effects of inverse responses and delays are well represented.A second contribution is a combination of algorithms (feedback, feedforward, and synchronization) to control the thermal phenomena in the DOC.Both contributions have been tested and validated experimentally. In conclusion, the o...

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Section: Description Of Phenomenamentioning

confidence: 99%

Model-based temperature control of a diesel oxidation catalyst

Lepreux¹,

Creff²,

Petit³

2012

Journal of Process Control

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“…Although, the hydraulic effects of two-stage fuel injection has been previously reported [47][48][49][50][51], the effects of advanced fuel injection modes on the fuel injection system are yet to be fully explored and few detailed in-cylinder studies have been carried out on the interaction of two-stage fuel injection and their effect on the injected fuel quantity, combustion characteristics and exhaust emissions. The objective of this study is to investigate the hydraulic effects of two-stage fuel injection on diesel combustion and emissions.…”

Section: Introductionmentioning

confidence: 99%

Experimental investigation of hydraulic effects of two-stage fuel injection on fuel-injection systems and diesel combustion in a high-speed optical common-rail diesel engine

Herfatmanesh

Zhao

2012

International Journal of Engine Research

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The final, definitive version of this paper has been published in International Journal of Engine Research, Vol 15 Issue 1, September 2012, ppublished by SAGE Publishing, All rights reserved.In order to meet the ever more stringent emission standards, significant efforts have been devoted to the research and development of internal combustion engines. The requirements for more efficient and responsive diesel engines have led to the introduction and implementation of multiple injection strategies. However, the effects of such injection modes on the hydraulic systems, such as the high-pressure pipes and fuel injectors, must be thoroughly examined and compensated for since the combustion and the formation of pollutants in direct-injection engines are directly influenced by the spatial and temporal distribution of the injected fuel within the combustion chamber. This study investigated the hydraulic effects of two-stage fuel injection on diesel combustion and emissions. The fuel-injection system was characterised for all the tested strategies through the measurement of the fuel-injection rate and quantity. In particular, the interaction between the two injection events was identified. The effects of two-stage injection, dwell angle and the interactions between two consecutive injection events on the combustion process and the emissions were investigated in a high-speed direct-injection single-cylinder optical diesel engine using heat-release analysis and high-speed fuel spray and combustion visualisation techniques. The results indicated that the two-stage injection strategy has the potential for simultaneous reduction of nitrogen oxide, soot and unburned hydrocarbon emissions. The results suggested that an optimum fuel quantity in the first injection exists, 0???30%, with which simultaneous reduction of nitrogen oxide, soot and unburned hydrocarbon emissions can be achieved with the added benefits of improved engine performance, fuel economy and combustion noise. However, higher soot emissions were produced, mainly due to the interaction between the two consecutive fuel-injection events whereby the fuel sprays during the second injection were injected into burning regions, as well as reduced soot oxidation due to the continuation of the combustion into the expansion stroke

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“…5 shows a comparison between the experimental and predicted volumetric static leakages, the latter being calculated by means of Eqs. (2) and (3), and then dividing _ m leak by the fuel density evaluated at 30°C and 1 bar. Factor K in Eq.…”

Section: Static Leakage Dependence On P Nom and Tmentioning

confidence: 99%

“…Diesel injection systems are required to realize high fuel metering accuracy and provide elevated injection pressure to meet the strict pollutant emission and fuel consumption regulations currently in force, while ensuring high engine performance and fun to drive [1][2][3].…”

Section: Introductionmentioning

confidence: 99%