Wyniki wyszukiwania - BazTech

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Nieprawidłowa praca wtryskiwaczy Common Rail pomimo pozytywnego wyniku badania

Olszowski S., Chojnacki T., Olszowski T.

Autobusy : technika, eksploatacja, systemy transportowe

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2017

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R. 18, nr 6

1003--1007, CD

PL

W artykule omówione zostały szczególne przypadki awarii wtryskiwaczy Common Rail, pomimo spełniania wymaganych kryteriów diagnostycznych producenta i przechodzenia z wynikiem pozytywnym testów na specjalistycznych stołach probierczych. Omówiono nowe możliwości diagnozy i sposoby wykrywania tego nadzwyczajnego stanu. Badania są rozwiązaniem potrzeb występujących w eksploatacji. Rynek usług serwisowych od dawna oczekiwał rozwiązania opisywanego problemu.

EN

This article describes the specific case of Common Rail injectors failures, despite meeting the manufacturer's diagnostic criteria and passing tests on specialist testing tables. New possibilities for diagnosis and ways of detecting this extraordinary condition are discussed. The research is the answer to exploitation's needs. The service market has long been waiting for the solution to problem described in this article.

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Conception of cylinder pressure based diesel injection control system

Bieniek A.

Journal of KONES

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2011

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Vol. 18, No. 3

27-35

EN

Control of diesel fuel injection is very important and has influence not only at engine operating conditions but also at emission of toxic gases as NOx, HC, and Particulate Matter (PM) are effect of combustion process. Directly observing of combustion process is very difficult, but implementation to injection control algorithm procedures based on additional sensors as knock sensor, cylinder pressure sensor and observing of rotational speed course could give enough information to optimize control algorithm. In traditional diffusion-burn diesel combustion start of combustion occurs a cetane-number based time delay after the start of the fuel injection. To fulfill of new emission standards is need to observing not only start of combustion but also whole combustion process. In the paper conception of injection control system applied with combustion process observer based on additional sensors. Closed-loop feedback control of cylinder pressure sensor and advanced control algorithm with high-resolution rotational speed sensor offers the potential to improve controllability of combustion process. Advanced control system based on heat release estimated from cylinder pressure and rotational speed fluctuations enabling improving engine exhaust emissions, engine performance and reduced noise emission. Introducing into control system a low cost glow plug integrated cylinder pressure sensor allow to achieve complete injection control system with advanced functions which could be very effective also in aspect of fuel consumption reduction.

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Influences of Alternative Fuels GTL, RME and ROR on Combustion and Emissions of a Modern HD-Diesel Engine

Czerwinski J., Zimmerli Y., Neubert T., Heitzer A., Kasper M.

Silniki Spalinowe

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2007

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R. 46, nr SC3

180-200

EN

Due to the limited energy resources as well as due to increasing CD2-emissions the importance of alterative- and biogene fuels is continuously increasing. Investigations of the engine operation were performed on a latest technology Liebherr engine for construction machines. It was operated using crude rapseed oil (RDR)'), rapeseed oil methyl ester (RME), synthetic Gas-To-Liquid fuel (GTL) and diesel (as reference fuel). The combustion diagnostics, the performance of the injection system as well as the pollutant emissions, including unlimited nanoparticles were assessed. The most important findings ean be summarized as joilows : Fuel injection - Both, RME and RDR shortened the injection delay which was due to a quicker increase of injection pressure and a faster needle lift, - the highest maximum injection pressure was observed with RDR (1610 bar), followed by RME (1580 bar), Diesel (1450 bar) and GTL (1410 bar), - As compared to diesel, GTL exhibited no significant differences of hydraulic behavior. Combustion - Usually, GTL caused a shorter ignition delay, but it burned slower, so that 50% of heat release took place at the same CA-position, as for Diesel. in addition, GTL provoked a lower rate of pressure raise and reduced the maximum combustion pressure. These effects were particularly pronounces at lower and medium loads. - At higher engine load RDR and RME started to bum earlier and at a higher rate, than Diesel and GTL. Therefore, 50% of the heat release followed with ROR and RME 1-2 CA earlier which had consequences for the NOx emissions. Limited emissions and energy consumption GTL lowered generally ail emission components - as compared to standard Diesel fuel. In addition, the energy consumption with GTL was equal or slightly lower. RME lowered CO and HC emissions and increased NOx emissions at ail operating points. It lowered PM at higher engine loads and increased PM at lower engine loads. RME had no effect on specific energy consumption. ROR lowered CO, HC and PM at ail operating points by at least 50% or more. In the high-load-operation RDR reduced the specific energy consumption (approx. 2%) and increased NOx (up to approx.5%). At low-load-operating points (1500 rpm/10%) ROR did not affect CO and NOx, but increased PM emissions and energy consumption. Nanoparticle emissions - GTL and diesel nanoparticle emissions were identical, - Both RME and RDR moved the PSD spectra to smaller sizes and increased the nuclei mode due to spontaneous condensate formation, - Both RME and RDR caused lower particle emissions at high load and higher emissions at low load, The use of ROR resulted in a particularly high portion of condensates (SDF) at low load and idling.