Past seminars at IEA in 2020

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Friday December 4, at 10:00

Ph.D Defense and Presentation:

" Thermal Management of Conductive Electric Road Systems "

Philip Abrahamsson

A transition from conventional vehicles to electric vehicles requires a well-developed charging infrastructure. Electric Road Systems (ERS) are designed to provide power to moving vehicles, both for propulsion and for charging the onboard batteries. By providing power to moving vehicles, the need for large onboard batteries is reduced as the batteries are only needed when there is no ERS present.

This thesis investigates an Alternating Short-Segmented ERS (ASSE), with respect to internal and surface temperature of the ASSE and lifetime estimations of the main power switches. A 3D FE thermal model is developed to assess how different charging cases affect the temperatures of the ASSE. This model is calibrated and validated with measurements from a full size ASSE. The model is then used to acquire the temperature profile for the heatsink of the main semiconductor switches, which is used as an input for the lifetime models. The lifetime models used in this thesis are developed for power modules and not discrete components. Due to this, experimental tests have been performed to recalibrate the lifetime models to better fit the components used in the ASSE.

The thermal model combined with the lifetime models are used to investigate both static and dynamic charging with regards to the temperature of the ASSE and the expected lifetime of the main switches. For static charging, the losses are localized to a small area, thus the risk of hot spots is larger than for dynamic charging. Since the vehicles are moving while performing dynamic charging, the losses are spread out over a larger area, minimizing the risk for hot spots.

Prof. Mats Alaküla (Lund University, Sweden)

Dr Reno Filla (Scania CV AB)

Due to imposed regulations with regards to the current COVID-19 pandemic, the public is invited to participate digitally via Zoom:

You may also participate in the defense by entering the following information in the 'Join a meeting dialogue' or in the Zoom app:
Meeting ID: 656 0696 6055

30 October 10:30-11:30
in KC M:IEA (https://www.iea.lth.se/map_IEA_Kemicentrum.pdf) and Zoom (see below)

"Visualisation of network loading and the impact of solar power at secondary substations in Lund"

Adam Nolte, Tuan Nam Vuong

The work has been carried out at Kraftringen.

Supervisors: Andreas Vikström (Kraftringen), Olof Samuelsson (IEA), Martin Lundberg (IEA).
Examiner: Francisco Marquez
Opponent: Ahmet Elmas

LU Zoom meeting: https://lu-se.zoom.us/j/63028450413?pwd=YXNJWUlSKzVFUEJ5SmE0UWtSL2t5QT09

You can also join the meeting by entering the following information in the Join a meeting dialogue or in the Zoom app:
Meeting ID: 630 2845 0413
Password: 900381

Friday 9/10 kl 13:15
in KC4 M:IEA, (https://www.iea.lth.se/map_IEA_Kemicentrum.pdf) and Zoom (see below)

Master's thesis presentation

Microwave Radar Implementation in Outdoor Home Alarm Systems

Isabelle Larsson
Gustaf von Plomgren

The use of short range microwave radars for motion sensing purposes are on the rise in multiple industries, as they are accurate, small in size and relatively cheap. The automotive industry, in particular, has pushed the development forward. Lately, the home alarm industry has also been glancing at the technology. Radars are well suited for outdoor applications as they are insensitive to precipitation, fog and hot weather that has an impact on the performance of the more common sensors used for intrusion detection: cameras and passive infrared (PIR) sensors. This report investigates how a microwave radar can be implemented as a motion sensing detector in a battery powered outdoor alarm device. Two microwave radars are evaluated before one is chosen for further testing. The experiments are conducted with a focus on the performance of the radar compared to the PIR, as well as the radar's adequacy in an outdoor environment. The final result is a prototype containing a PIR sensor and a camera together with a 24 GHz radar as a secondary sensor. Even though the radar outperforms the PIR, it is too power consuming to be implemented as the primary sensor of a battery driven device. The report concludes that low cost, low power radar sensor may very well be a part of the next generation home alarms.

The work has been carried out at Verisure Innovation AB, Malmö

Supervisors: Alexander Israelsson (Verisure), Gunnar Lindstedt (IEA)
Examinator: Johan Björnstedt (IEA)
Opponents: Joakim Cedergren, Jonathan Berglund

LU Zoom meeting: https://lu-se.zoom.us/j/67809084074
Meeting ID: 678 0908 4074 (Waiting room enabled)

11 September 11:00-12:00
in KC M:IEA (https://www.iea.lth.se/map_IEA_Kemicentrum.pdf) and Zoom (see below)

"Estimation of load profiles for secondary substations - Generalising AMR data with a statistics and deep learning approach"

Hans-Christian Nilsson

The work has been carried out at IEA.

Supervisor: Olof Samuelsson.
Examiner: Francisco Márquez Fernández.
Opponent: Ida Samnegård

LU Zoom meeting: https://lu-se.zoom.us/j/63028450413?pwd=YXNJWUlSKzVFUEJ5SmE0UWtSL2t5QT09

You can also join the meeting by entering the following information in the Join a meeting dialogue or in the Zoom app:
Meeting ID: 630 2845 0413
Password: 900381
10 September 11:00-12:00
in KC M:IEA (https://www.iea.lth.se/map_IEA_Kemicentrum.pdf) and Zoom (see below)

"Reglering av solcellers omriktare - Spänningar och förluster i elnätet"

Ahmet Elmas

The work has been carried out at IEA.

Supervisors: Olof Samuelsson, Martin Lundberg.
Examiner: Mats Lilja.
Opponents: Adam Nolte, Tuan Nam Vuong

LU Zoom meeting: https://lu-se.zoom.us/j/63028450413?pwd=YXNJWUlSKzVFUEJ5SmE0UWtSL2t5QT09

You can also join the meeting by entering the following information in the Join a meeting dialogue or in the Zoom app:
Meeting ID: 630 2845 0413
Password: 900381
Måndag 15 juni kl 14:00 - 15:30, i Zoom https://lu-se.zoom.us/j/65713697329
Presentation av examensarbete.

Automated contact-less verification of plate geometry

Gustav Persson

The challenge of measuring the dimensions of metal objects to within a few hundredth of a millimeter is prevalent in many industries such as manufacturing, automotive and medical. This thesis evaluates several different types of measurement equipment capable of measuring pressed heat exchanger plates in regards to measurement resolution, speed and accuracy. Once a suitable technique is found, a corresponding concept is generated, constructed and evaluated. The final constructed solution is able to measure select parameters accurately to within 15 um of a sample digitized and measured by a highly accurate 3d microscope. Algorithms for automatic top-valley depth detection is developed, as well as several filtering techniques.

Handledare: Gunnar Lindstedt, IEA
Examinator: Johan Björnstedt, IEA

Fredag 12 juni kl 10:00 - 11:00, i Zoom https://lu-se.zoom.us/j/66690186130
Presentation av examensarbete.

Utveckling av ett två-axligt bildsensorstabiliseringssystem

Albert Knutsson, Nicklas Lindell

This work describes the design and implementation of a balanced stabilizing system for a camera image sensor using small linear dc actuators. Simulation tools COMSOL and FEMM 4.2 are used to evaluate actuator with regards to force production, force linearity and hall effect sensor compatibility. Additionally position sensing of the system is implemented using a differential hall effect sensor setup to minimize temperature impact. A simple prototype is built to verify simulated results.

Handledare: Tomas Johansson, Tobias Rattfelt
Handledare: Francisco J. Márquez-Fernández, Avo Reinap, IEA
Examinator: Mats Alaküla, IEA
Opponenter: Albert Larsson, Elsa Höjbert, Vigan Spahiu

Fredag 12 juni kl 08:30 - 10:00, i Zoom https://lu-se.zoom.us/j/68292604623
Presentation av examensarbete.

Continued integration of simulated vehicle model for software verification in CANoe and Simulink

Johan Persson

This Master’s thesis investigates if a previously integrated Simulink based vehicle model works in the main testing software, CANoe, for testing and verifying software on an ECU (electronic control unit) used to control a four-wheel drive coupling in cars. It also investigates the possibility to use static evaluation requirements in a dynamic model. Static evaluation means that different vehicle parameters are set to a certain value, and the answer generated from the software is checked with a predetermined value. The simulated model is dynamic, which means that by setting one vehicle parameter to a specific value might change the value of another parameter. By using a simulated vehicle instead of a real one it is possible to get a good estimation of how the product will fare to a fraction of the cost. The investigation showed that the model was working as intended, and that using static evaluation requirements is possible but not optimal compared to dynamic requirements. This thesis was done at TVR-SW (software verification) department at BorgWarner in Landskrona, Sweden.

Handledare: Richard Pendrill, BorgWarner; Anton Karlsson, IEA
Examinator: Gunnar Lindstedt, IEA

Torsdag 11 juni kl 10:30 - 11:30, i Zoom https://lu-se.zoom.us/j/62511669255
Presentation av examensarbete.

Local energy system – comparing direct current (LVDC) and alternating current (LVAC)

Markus Alm

This thesis uses a case study to compare the viability of using direct current instead of alternating current to supply power to 5 buildings in a distribution grid. The case study sought to show how using LVDC instead of LVAC could increase the effectiveness of solar panels (PV), batteries and interconnecting buildings into a local energy system (LES). The system studied in this thesis was designed so the buildings would share the same carrier base as the distribution grid they were attached to, so the LVDC distribution grid would have DC-based buildings.
The case study found that adding batteries to an LVDC system would increase self-sufficiency less than adding them to an LVAC system, and that the LVAC system would require more power from an external grid. The case study also found that using an LVDC system increased the system's overproduction and self-sufficiency for all LVDC cases.
The thesis concluded that building an LVDC system where buildings could share solar overproduction and battery power, reduced the amount of power needed from an external grid by 3,5% compared to an LVAC system with separate buildings and no batteries. The LVDC system was also 23% more self-sufficient than the LVAC system counterpart.

Handledare: Peder Kjellén, E.ON Energidistribution; Jörgen Svensson, IEA
Examinator: Olof Samuelsson, IEA

Torsdag 11 juni kl 08:30 - 10:00, i Zoom https://lu-se.zoom.us/j/67269793093
Presentation av examensarbete.

Automating the opening and closing mechanism of a functional test fixture

Simon Susnjevic

When producing printed circuit boards, end of line testing needs to be done in order to assure that as few faulty products as possible reach the customer. This can be done manually but, takes long time. By using a function test fixture it is possible to do the test faster and cheaper. A functional test fixture is a fixture with a lid where the printed circuit board is placed. When the lid is closed needles are pressed on the printed circuit boards test points which, in turn connects to a computer performing several tests.
Opening and closing the functional test fixture automatically can save a lot of time and hence money in the end of line testing. Automating the opening and closing requires not only a solution for the opening and closing of the fixture, but also a solution for how to make the operation safe.
The aim of this thesis is to investigate the safety standards relevant for such a automation, coming up with a design for the opening/closing and safety, choosing one design, implementing it and evaluating the results. The implemented solution automated all mechanism except for closing. This was due to some miss calculations. One part of the solution was position measuring with an accelerometer. For the implemented solution the accelerometer was only used to determine the lids end positions, but the possibility to measure the continuous angle of the lid was tested and implemented with the purpose of evaluation for future use and further implementation continuously requiring the lids position. Implementing the safety solution was not done due to lack of time.

Handledare: Mats Iderup, Mikrodust AB, Gunnar Lindstedt, IEA
Examinator: Johan Björnstedt, IEA
Opponenter: Hannes Bydén, Alexander Lundström

Onsdag 10 juni kl 10:30 - 12:00, i Zoom https://lu-se.zoom.us/j/69734201677
Presentation av examensarbete.

Estimation of inertia in power systems using electromechanical modes

Vidar Johnsson

The transition to more renewable energy such as wind, leads to a decreased inertia in the power system. As a consequence of this, disturbances lead to larger frequency deviations and the frequency stability of the system is worsened. Therefore, there is a surging interest to estimate the inertia in the power system.
In this thesis, a novel method for inertia estimation is proposed and investigated. It is based on the electromechanical modes of the system. The modes are estimated from measurements, a system model is constructed, and the inertia is found such that the modes of the model correspond to the estimated modes. This divides the method into two parts. One is the estimation of modes, and one is the estimation of inertia from the modes. Furthermore, there is a division between the slow rigid body mode of the entire system and the faster intergenerator modes. Both are possible to use in the method. The former is harder to estimate, while the latter are more dicult to use for inertia estimation.
The mode estimation was investigated by testing estimation methods on simulated systems where the true modes were known. The inertia estimation from the modes was performed by an optimisation routine in PowerFactory, and several systems with a few generators were analysed.
It was concluded that it was possible to estimate the modes in the simulations, at least if they were not too damped. The accuracy was in the range of 10% for the imaginary part of the rigid body mode, and higher for the intergenerator modes.
The rigid body mode was highly valuable for inertia estimation, and the total system inertia could be determined with approximately the same accuracy as the mode could be estimated. Using the imaginary part and the mode shape of intergenerator modes, it was possible to estimate the total inertia with approximately 10% standard deviation. Typically, a few inter-generator modes suced for estimation.
Combining the two parts of the method and testing it on the IEEE 14-bus test system with added hydro governors showed that inertia estimation was possible.

Handledare: Olof Samuelsson, IEA
Examinator: Ulf Jeppsson, IEA
Opponent: Johan Lindberg

Tisdag 9 juni kl 10:30 - 11:30, i Zoom https://lu-se.zoom.us/j/63836994151
Presentation av examensarbete.

Applying AI in Business: A Framework for AI Implementation in Product Offerings

Viktor Regefalk

Artificial Intelligence is on its way to enter the world of business and there are huge potentials for companies who take advantage of the technology. However, to succeed with new technology like AI there is a need for guidance. This thesis examines how businesses can implement AI in their product offering.
This thesis investigates the implementation of AI in product offerings by first examine academic books and research papers about implementation strategies and product innovation methods. In the second part, empirical observations from Company X and their work with AI are collected. A framework for AI implementation is constructed considering the findings from the literature study and the empirical data from Company X. This framework aims to give guidance to organizations in their work with AI and product development.
The main conclusion from the study shows that implementing AI is more of an organizational difficulty than a technical difficulty. Firstly, implementing AI in product offerings requires close cooperation with the product-user during the whole process. Secondly, organizations need to have a committed management team that dares to invest in AI resources. Lastly, having the necessary competence within AI and data science is crucial, which is a scarcity in today’s labor market. However, organizations should not feel obligated to develop all competencies internally, the optimal strategy might be to collaborate with external technology partners for accessing needed capabilities.

Handledare: Petra Sundström , Sandvik AB; Gunnar Lindstedt, IEA
Examinator: Ulf Jeppsson, IEA

Fredag 5 juni kl 09:00 - 10:00, i Zoom https://lu-se.zoom.us/j/63452326600
Presentation av examensarbete.

Emergency Power for Wind Turbine Yaw System - Initialization Toolbox

Vigan Spahiu

The Yaw Power Backup System (YPBS) is a safety system that needs to be incorporated in the Wind Power Plant (WPP) in order to provide emergency power during a power outage. The YPBS enables the Wind Turbine Generator (WTG) to perform a yawing operation in extreme weather conditions. The yawing operation ensures the rotor is aligned with incoming wind, minimizing the acting forces on the blades and structure. The YPBS consists of a central placed emergency backup generator that generates power to the loads. A step-up transformer that transmits power from the generator to the internal electrical system of the WPP network and a shunt reactor that compensates for the capacitance in the collector cable system. The YPBS needs to supply power to the active components and provide frequency and voltage stability in the WPP. The YPBS component design is site-specific and requires information about the electrical infrastructure of the WPP in order to supply the required power and operate safely. In this thesis project, an initialization tool is developed to identify the loads and to obtain an early estimation of the ratings and costs for an internal evaluation of the YPBS project. A responsibility matrix is also developed to identify the work activities and responsibilities for management of the YPBS project during construction and service phase together with Vestas engineers.

Arbetet utfört vid Vestas Northern & Central Europe, Malmö.

Handledare: Nofel Dakhel, Vestas; Avo Reinap, IEA
Examinator: Olof Samuelsson, IEA
Opponenter: Valon Rama, Markus Alm

Tisdag 2 juni kl 10:30 - 11:30, i Zoom https://lu-se.zoom.us/j/61094726445
Presentation av examensarbete.

Development of a device to move Pan-Tilt-Zoom cameras using hand gestures

Irene Sempere Diaz, Amelie Bäck

Nowadays, many industries are investing a lot of resources in the development of new technologies that interpret hand gestures and use them as a communication interface between the user and the system. However, the surveillance industries have remained on the sidelines of this technological development. Instead, the joystick and the mouse are the most common devices found in control rooms. Using them together with a Video Management System, the operators are able to drive the cameras and navigate between different views. Both devices fulfill their functions successfully but some operators report persistent pain after a demanding work day. Based on the points made above, the purpose of this master thesis is to investigate the possibility of using hand gestures as an interface to control surveillance cameras and design the hand gesture vocabulary to be used. To verify the validity of the idea a prototype will be developed to control Pan-Tilt-Zoom cameras, with special emphasis on having an intuitive and ergonomic design. Throughout the project different solutions to solve the touch-free control of the cameras have been discussed and investigated. The most suitable concept found was to attach infrared sensors to a pyramid shaped case, in such a way that several sensors could be used to create a sensing field. By measuring the exact position of the hand at all times, the gestures made by the user could be interpreted by the system. The infrared sensors have proven to be very good at sensing the distance to soft materials such as hands with an accuracy of one millimeter. The results obtained from the usability test made in this thesis show that the device is intuitive for the users and the potential of the device is also remarked for surveillance applications. In addition, the results show that the readings made by the sensors are very precise and that the interpretation of the achieved data into gestures works satisfyingly. However, even though the given results were mainly positive, it shows that there is still work left to do in order for the device to be competing with the joystick.

Arbetet har utförts vid Axis, Lund.

Handledare: Simon Preutz, Axis, Gunnar Lindstedt, IEA
Examinator: Johan Björnstedt, IEA

Fredag 29 maj kl 10:30 - 11:30, i Zoom, Presentation av examensarbete.

How Organizational Structures Affect the Implementation of Robotic Process Automation

Joakim Härd, Max Svensson

The case company, a packaging company in Lund, Sweden, operates in an industry where high productivity is becoming increasingly crucial to remain the industry leader. One of the most rapidly growing automating technologies today is RPA. The case company has adopted this technology. As of now the case company uses a centralized approach in implementing RPA which means that the planning, development, and deployment is conducted from a specific department. The Parts Supply Chain (PSC) department at the case company has identified that this centralized approach leads to long lead times and a reduced development speed. To achieve a better outcome in future RPA projects, the companyÕs PSC department wanted to investigate if there is a more efficient approach to implementing RPA. They wanted to investigate whether decentralizing their RPA-related Information Technology-structure (IT) would be beneficial.

Arbetet utfört vid Tetra Pak, Lund.

Handledare: Pontus Holm, Tetra Pak, Gunnar Lindstedt, IEA
Examinator: Ulf Jeppsson, IEA

Opponent: Hampus Rosvall

Onsdag 27 maj kl 09:15 - 11:15, i Zoom, Presentation av examensarbete.

Investigation and Analysis of Wireless Battery Management System and Designing BMS for a FS Electric Car Li-Ion Battery Pack

Praveen Kumar Goragundi Mahesh

Handledare: Gunnar Lindstedt, Alaküla, IEA
Examinator: Pietro Andreani, EIT

Onsdag 29 april kl 09:00 - 10:00, i Zoom, Presentation av examensarbete.

Precision of EMD-WRF reanalysis for wind power estimations, using WindPRO

Mathieu Bruneau

Popular Summary:
Wind development is a long and costly phase, sometimes wind power plants can take more than four years to build. In that context, one year is already used to record the wind data (speed and direction) and after a full year of recording, it is possible to notice that the site does not have enough potential to install a wind farm. One solution looked into here is to use computer generated wind data, reanalysis, to do a wind estimation of a site. Those data are available immediately and cover different years. Unfortunately, their precision still needs to be improved. The work focused on looking for criteria to reduce the uncertainty of those reanalysis. Terrain complexity was noticed as having an impact on the reanalysis precision.

The work has been carried out at ENCIS Environmental in France.

Handledare: Jörgen Svensson, IEA
Examinator: Olof Samuelsson, IEA

Monday 2 March 10:30-11:30, M:IEA

Low Frequency Currents and their Effects in the Power Grid

Dennis Albert, TU Graz, Austria

Low frequency currents, e.g. geomagnetically induced currents (GIC), can cause power quality issues in the power transmission grid. Especially power transformers can already be sensitive to low frequency currents with amplitudes of several amps. In the joint research project with the Austrian transmission grid operator and Siemens power transformers TU Graz investigates the effects on power transformers and develop guidelines how to deal with different levels of LFC in the grid. For this purpose measurement systems are installed to correlate measurement with simulation. Lab tests with 0.4/35 kV power transformers help to draw conclusions of LFC effects for large power transformers.

Tisdag 25/2 kl 10:30, M:IEA, Presentation av examensarbete.

Automatic recovery in robotic pattern creation

Erik Gamst

Handledare: Gunnar Lindstedt IEA
Examinator: Johan Björnstedt, IEA

Opponenter: Louise Bergwall, Gustav Persson

Torsdag 20/2 kl 15:30, M:IEA, Presentation av examensarbete.

Auto-testing of code

Flamur Breznica


Production companies uses machines to create products, these systems are called automation production systems. Testing on automation production system is crucial for the machine to work as intended. Usually testing is done manually after the product is finished and sometimes it is done during development. Testing is done to improve the machine code, it needs to do something wrong to fail the tests. If it does something wrong, the system shows that it needs to get better at specific parts. These faults are shown through testing the machines and there are different ways of testing machines. Today testing is usually done manually and this thesis will explore the possibility and the limitation with making testing run automatically as well as developing a theoretical machine.

The thesis includes a project that was done at a machine company in Helsingborg. The purpose of the thesis is to enhance the way of testing to an automatic regression testing of the code. The report went through the options that exist and different approaches was analyzed. Then picking one to be implemented, it was necessary to go through research that became the base of this thesis. The task was to simplify the way of testing inside the software for companies, or at least help companies to have better machines with earlier commissioning of machines and enabling distance maintenance. By analyzing different software aspects and old reports written about automatic testing and then implementing a testing strategy to a controller. The thesis also developed a controller and a theoretical machine that needed to be tested. The next part was to simulate the controller and lastly illustrate the combination with a view.

By developing the machine code it was possible to create automatic tests on it called unit tests. This was complemented with a simulation part that was successfully shown on a human machine interface. By doing this it is possible to save time and money but it will be dependant on the persons creating the tests. The simulation was done through TIA portal and in the future a better and more suited environment could be used for simulation purposes. The strategy with complementing simulation with unit testing is a good way of making testing automatic. While doing this it will be needed to simulate the entire machine with all of its complex parts which opens up possibilities for remote maintenance and updates with remote testing since all physical hardware can be simulated.

When all of this was done and the machine was implemented with the testing and the simulation it was evaluated to be time saving and that there is options for making it automatic and machines with better quality.

Arbetet utfört vid Ecolean AB, Helsingborg

Handledare: Christian Isaksson, Ecolean AB; Mats Lilja, IEA
Examinator: Gunnar Lindstedt, IEA
Torsdag 6/2 kl 13:15, M:IEA, Presentation av examensarbete.

Electronic Control Unit for Automatic Control of Torque Vectoring

John Huzell, Johan Göransson

Torque vectoring for automobiles is used to increase cornering speeds and improve road safety by manipulating the car's wheel-speeds. One method of torque vectoring for a rear-wheel-drive Formula Student racecar is using a dual-clutch to slip the inner wheel thus create a yaw moment during cornering. The goal of this thesis was to develop and design an electronic control unit to automatically control the two clutches to achieve the target yaw moment. By building on the previous development of a dual-clutch and a theoretical control model, this thesis was delimited to the implementation of an automatic control algorithm on the hardware used to control the dual-clutch. Ulich and Eppinger's product development method was used to develop an initial alpha-prototype for proof-of-concept development. A beta-prototype was then developed to control the dual-clutch via a Controller Area Network (CAN), before being packaged into a final product, the Torque Vectoring Electronic Control Unit (TVECU). The final product resulted in an electronic control unit capable of being mounted to a mechanical dual-clutch and regulating two Gen6 clutch actuators, thereby controlling the yaw moment. It can then be used to test, validate and further develop a dual-clutch torque vectoring system, and lays the foundations for a next-generation commercial model.

Arbetet utfört vid BorgWarner Sweden AB

Handledare: Daniel Blom, Pontus Månsson (BorgWarner Sweden AB), Gunnar Lindstedt (IEA)
Examinator: Johan Björnstedt (IEA)

Fredag 31/1 kl 13:15, M:IEA, Presentation av examensarbete.

Modelling and filtering of wheel speed signals to determine driveline behavior in an all-wheel drive vehicle

David Bäcklund, Jakob Wilson

Abstract In vehicles there are many issues involving the safety and performance. The safety issues are often regulated by governments, whereas the performance by the customer. One solution to both these issues is to take use of an all-wheel drive system, where a coupling engages and disengages driving axles when needed. Such a solution will, through added traction and stability, increase performance and safety when needed and optimize fuel efficiency when not needed, due to driving on only two wheels. An essential factor to optimize the performance is to know the temperature of the coupling at any given time. The simplest way to solve this problem is to use a temperature sensor, but due to the ever optimization of the vehicle, such features ought to be removed in an effort to drive down cost and weight. Instead the temperature is determined using a model of the vehicle's driveline, which estimates the speed difference over the coupling. This can in turn decide how much friction is exerted on the coupling and from there the temperature can be decide to a high degree of exactness, given that the speed difference is exact. The aim of this thesis has been to investigate a novel method of modelling the driveline, in Matlab/Simulink, to get a more exact speed difference over the coupling in certain driving scenarios where the existing method tends to fail. Using sensor measurement on a real world vehicle, the model should mimic the reactions of the measurement in the same driving scenarios. The master thesis has been performed at BorgWarner Sweden AB for Lund University.

Arbetet utfört vid BorgWarner Sweden AB

Handledare: Daniel Blom och Mia Grahovic (BorgWarner), Gunnar Lindstedt (IEA)
Examinator: Johan Björnstedt, IEA
Fredag 24/1 kl 08:30, M:IEA, Presentation av examensarbete.

Algorithm for anti-tip over function

Jens Franzon

I detta examensarbete analyseras olika risker för att välta med en truck som utför moment vid godshantering. För att använda de mekaniska modellerna krävs sensordata och vissa sensorer finns redan på dagens truckar men ytterligare föreslås som ett resultat av arbetet.

Arbetet utfört vid Cargotec Sweden AB, Ljungby

Handledare: Hampus Lavin, Cargotec; Gunnar Lindstedt, IEA
Examinator: Johan Björnstedt, IEA

Past seminars at IEA in previous years
2022, 2021, 2020, 2019, 2018, 2017, 2016, 2015, 2014, 2013, 2012, 2011, 2010, 2009, 2008, 2007, 2006, 2005, 2004, 2003, 2002, 2001, 2000, 1999, 1998