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By using a turbo the operating range of the HCCI engine can be increased, but at the expense of increased controller complexity. The dynamics the turbo introduces in the intake and the exhaust manifolds, have a large impact on the in-cylinder mixture temperature, pressure and finally the combustion phasing. To compensate for this and to maintain desired combustion phasing, precise control of the n
For diesel engines the major exhaust problem is particulate matter and NOx emissions. To reduce NOx, exhaust gas recirculation (EGR) is often used. The behavior of the EGR-level will therefore influence the emissions and it is therefore valuable to keep track of the EGR-level. Especially during transients it is difficult to predict how the EGR-level varies. In this paper the CO2-level in the intak
Partially Premixed Combustion (PPC) is a combustion concept by which it is possible to get low smoke and NOx emissions simultaneously. PPC requires high EGR levels and injection timings sufficiently early or late to extend the ignition delay so that air and fuel mix extensively prior to combustion. This paper investigates the operating region of single injection diesel PPC in a multi cylinder heav
A diesel engine developed for an international market must be able to run on different fuels considering the diesel fuel qualities and the increasing selection of biofuels in the world. This leads to the question of how different fuels perform relative to a standard diesel fuel when not changing the hardware settings. In this study five fuels (Japanese diesel, MK3, EN590 with 10% RME, EN590 with 3
Natural gas and hydrogen enriched natural gas has been tested as fuels together with diesel oil and RME in a single cylinder Scania research engine. The gas was introduced as port injection while the diesel was introduced as early direct injection. Because the gas was premixed with air before combustion and the diesel was injected early in the compression stroke, the engine ran close to HCCI mode.
In HCCI you do not have the same control of the combustion like in SI and Diesel engines. Controlling the start of a combustion event is a difficult task and requires feedback from previous cycles. This feedback can be retrieved from ion current measurements. By applying a voltage over the spark gap, ions will lead a current and a signal that represents the combustion in the cylinder will be retri
Utilization of an ethanol driven, combustion-based power generator promises high-efficiency combustion in diesel-like engines and avoids problems connected to shrinking supplies of fossil fuels since fuels like ethanol or dimethyl ether can be produced from renewable resources. Fuel injection into such generator through a piezoelectric micro mass flow controller (MMFC) features low power consumpti
A piezoelectric micro mass flow controller (MMFC) for liquid fuel injection into a mini-HCCI-motor for power generation is introduced. Piezoelectric actuation ensures negligible power consumption for fuel injection allowing self-sustaining operation. A pressurized fuel tank is connected to the MMFC which is designed like a normally-closed, on-/off-operating valve. Integrated piezoresistors are use
This work has focused on studying the in-cylinder pressure fluctuations caused by rapid HCCI combustion and determine what they consist of. Inhomogeneous autoignition sets up pressure waves traversing the combustion chamber. These pressure waves induce high gas velocities which causes increased heat transfer to the walls or in worst case engine damage. In order to study the pressure fluctuations a
We investigate the impact of employment protection regulation on firms’ reluctance to apply for bank finance (loans and overdrafts). Our findings reveal that longer notice periods reduce the likelihood that firms are discouraged from applying for bank finance in the case of blue-collar workers, but they increase it in the case of white-collar workers. Our interpretation is that, in the case of blu
Mental health issues differ widely among individuals, with varied signs and symptoms. Recently, language-based assessments have shown promise in capturing this diversity, but they require a substantial sample of words per person for accuracy. This work introduces the task of Adaptive Language-Based Assessment (ALBA), which involves adaptively ordering questions while also scoring an individual’s l
The entanglement of business and consumption practices have been neglected in prior consumer research. We address this issue by developing the concept lifestyled business practice. Through a study of criminal gangs in Sweden we contribute by developing three main entanglements of business practice; hedonic structures, stylized intelligence and sonic monetizationThe entanglement of business and consumption practices have been neglected in prior consumer research. We address this issue by developing the concept lifestyled business practice. Through a study of criminal gangs in Sweden we contribute by developing three main entanglements of business practice; hedonic structures, stylized intelligence and sonic monetization
This publication describes a concept that intends to enable an optimization of machining with regard to the balance between criteria related to technology, economy and sustainability. The work is of a discussion nature and intends to provide a framework for further research and development in the area. Previous research and development during the 80's and 90's is presented in general terms and in
There is a need of problematizing taken for granted assumptions in the conceptualization of collaborative housing when attempting to link collaborative housing and social integration. What are the difficulties and opportunities that migrants and non-migrants face in accessing collaborative housing projects? Addressing such type of questions will help to capture exclusionary processes affecting old
An estimation model which uses the gross heat release data and the fuel energy to estimate the total amount of emissions and unburned Hydro Carbon (HC) is developed. Gross heat release data is calculated from a self-tuned heat release method which uses in-cylinder pressure data for computing the energy released during combustion. The method takes all heat and mass losses into account. The method e
Popular Abstract in Swedish Vårt samhälle är beroende av ett stabilt klimat och förändringar av temperaturen påverkar direkt ekonomisk aktivitet. Att vår hälsa påverkas negativt och att vi har svårare att arbeta produktivt under värmestress är ingenting nytt utan det har studerats ingående. Dock i det samtida sammanhang som överskuggas av ökad värmestress på grund av klimatförändringarna, saknas mHeat stress has been studied extensively. However, in the contemporary context of climate change there is a lack of information on the extent of future heat stress and its consequences, especially in occupational settings. The main aim of the research was to identify the current knowledge gaps by conducting a literature review (paper I) together with the collection of empirical data to examine the
Human Rights Education Archives - The Raoul Wallenberg Institute of Human Rights and Humanitarian Law Skip to content Search for: Search Button Home About Us Who We Are Our History About Raoul Wallenberg Our Theory of Change Staff Opportunities Annual Reports Whistleblower Our work What we do Multi-Disciplinary Research Higher Education Strategic Advice and Analysis Outreach Evaluation of Programm
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INNOVATION: Build Your Own Start-up – From Idea to Scalable Model using a Lean Start-Up Approach Hoppa till huvudinnehåll Den här webbplatsen använder cookies för att förbättra användarupplevelsen. Genom att fortsätta använda webbplatsen samtycker du till att cookies används enligt vår cookie-policy (på LTH:s webbplats) . Absolut nödvändiga cookies Dessa cookies är nödvändiga för att webbplatsen s
Projektbaserad kollegiekurs Centre for Engineering Education LTH KURSPLAN GB_S21 Datum 2012-10-08 Reviderad 2024-05-20 Projektbaserad kollegiekurs (Collegial Project Course) Projektbaserad kollegiekurs är en valbar kurs inom den behörighetsgivande högskolepedagogiska utbildningen vid LTH och vänder sig främst till grupper av lärare som delar samma pedagogiska sammanhang. Kursen ges på förfrågan i
https://www.cee.lth.se/sites/cee.lth.se/files/2026-05/Kursplan_projektbaserad%20kollegiekurs_GB_S21_2024-05-20.pdf - 2026-07-11
