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Qualitative Examination on Dependability of European Road Train Architecture

Budapest University of Technology and Economics-Tímea Fülep
Knorr-Bremse Systems for Commercial Vehicles-Michael Herges, Laszlo Palkovics
Published 2008-10-07 by SAE International in United States
The road transport is becoming more and more problematic in the countries of the European Union. Some predictions show an increase of 80–100% of the current volume of goods and passengers will be transported in the EU within the next decade, and most of this increase – despite of the efforts made in promoting the rail and waterway transport – will be added to the already overloaded roads. It seems, the only feasible solution to fulfill this transportation demand is to increase the vehicle overall length and weight at the lowest complexity, providing the maximum utilization of the existing vehicle units only with smaller modifications and higher reliability.
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Model-Based Development of Distributed Embedded Real-Time Systems with the DECOS Tool-Chain

Budapest University of Technology and Economics-András Balogh, György Csertan
Austrian Research Centers GmbH - ARC-Wolfgang Herzner, Rupert Schlick
Published 2007-09-17 by SAE International in United States
The increasing complexity of distributed embedded systems, as found today in airplanes or cars, becomes more and more a critical cost-factor for their development. Model-based approaches have recently demonstrated their potential for both improving and accelerating (software) development processes. Therefore, in the project DECOS1, which aims at improving system architectures and development of distributed safety-critical embedded systems, an integrated, model-driven tool-chain is established, accompanying the system development process from design to deployment. This paper gives an overview of this tool-chain and outlines important design decisions and features.
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Electro-Mechanical Suspension Actuator With Energy Recuperative Feature

Budapest University of Technology and Economics-István Zador, Bence Falvy
Knorr Bremse Systems for Commercial Vehicles-László Palkovics
  • Technical Paper
  • 2006-05-0440
Published 2006-10-22 by Society of Automotive Engineers of Japan in Japan
One of the main trends in vehicle production today is the developing and correcting the vehicle's own convenience, in safety operating. One segment is the suspension, since it can ensure the necessary conditions for other safety systems like ABS, ESP, steering system, etc. Simultaneously the suspension has to hold the body of the vehicle in comfort; solving that problem is still difficult. Nowadays passive suspension systems can not fulfill these conflicting requirements anymore, it is becoming more urgent to introduce active and semi-active suspensions in practical use. The direct contact with other safety systems makes the suspension a justified part of the X-by-wire system. This way we can include more functionality in the suspension, since we can access additional information for being used as input data for the active suspension system. A permanent magnet synchronous tubular (TLSM) machine - used as a motor - is capable of acting as an active element in the suspension (axle displacement, vehicle tilting). When used as a generator, there is no energy consumption of the machine itself, it is…
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Design Anomalies of Electro-Mechanical Brake Systems

Budapest University of Technology and Economics-Levente Balogh, Tamas Streli, David Lengyel
Knorr Bremse Research and Development Center Budapest-Huba Nemeth, Laszlo Palkovics
  • Technical Paper
  • 2006-05-0444
Published 2006-10-22 by Society of Automotive Engineers of Japan in Japan
This paper analyses the behavior of the electro-mechanical brake system based on model calculations as well as on physical prototype. The main driver of the analyses is the demand on the specification for electro-mechanical system. Today there is no exact requirement list available; many points are still open concerning the current consumption, safety solutions in case of loss of control. The specification for air brake system is the one that could be applicable for electro-mechanical system design. However to develop the electro-mechanical brake according to the air brake requirement is also not the best solution. A separate measurement-based specification has to be created for electro-mechanical system as well.
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The Changes of Burning Efficiency, Emission and Power Output of a Diesel Engine Fueled by Bioethanol-Biodiesel-Diesel Oil Mixtures

Budapest University of Technology and Economics-Máté Zöldy
  • Technical Paper
  • 2006-05-0201
Published 2006-10-22 by Society of Automotive Engineers of Japan in Japan
The environmental pollution and the decrease of the oil-based fuels are the greatest problems of the automotive industry at the start of the 21st century. There were and certainly there are a number of experiments aiming to substitute the petrol and the diesel oil with other fuels. One group of these substitutable fuels is the bioethanol-biodiesel-diesel oil mixtures. These mixtures are very similar to the fuels used today, as it can be used in the engines without any structural changes.At the Technical University of Budapest investigations have been made to explore the possibility of using bioethanol-biodiesel-diesel oil mixtures in vehicles and agricultural engines. The main aspects of the researches was find blends that are substitutable for diesel oil consisting of the most renewable part as possible, reaching the same or similar power output and lower the emissions.The experimentations were based on mixing bioethanol and biodiesel with diesel oil. Our idea was, when the biofuels are mixed they supplement each other, cutting the negative effect of each and increasing the renewable component rate in the fuel.…
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Integrated Commercial Vehicle Chassis Control

Budapest University of Technology and Economics-Timea Fülep
Knorr Bremse Systems for Commercial Vehicles-Andras Voith
  • Technical Paper
  • 2006-05-0453
Published 2006-10-22 by Society of Automotive Engineers of Japan in Japan
The increase of the commercial vehicle traffic on our roads is the main reason of the development of enhanced electronically controlled systems. On the roads of Europe, the commercial traffic will be increased by about 60% within the next years. As a result the number of accidents will increase as well and traffic efficiency and traffic flow will suffer. Trucks will contribute over proportionally to the accident numbers. In order to be able to control this growth and decrease - or better prevent - the number of accidents by reducing the gap between the dynamical behavior of passenger cars and heavy vehicles, several systems will come to the market in the near future. These systems together will form an electronically controlled intelligent powertrain. This electronic control architecture is able to synchronize the different subsystems such as braking, steering, transmission, etc. This paper focuses on a control algorithm which is capable of intervening in the braking - including brake blending, as a part of the complex powertrain control, - steering and semi-active suspension control systems, which…

Does Accident Analysis Convince Us to Develop Active Safety Systems?

Budapest University of Technology and Economics-Gábor Melegh, Dávid Lengyel
ThyssenKrupp Presta-István Wahl, István Jánosi
  • Technical Paper
  • 2004-05-0395
Published 2004-05-23 by Society of Automotive Engineers of Korea in South Korea
One of the most important wishes of the car manufacturer is to ensure that the new developed cars correspond to the expectations of the increasing traffic safety. Reaching this wish such active safety systems are necessary, which continuously appear in passenger cars for many years, on account of speedy developing electronics.Nowadays, in modern vehicles the active safety systems act into the brake system, engine, powertrain and the suspension operation in case of emergency. This possibility will be extended with steering interaction in the close future as well. However, the active safety systems work separately, prohibiting the advantage of integrated systems. Finding out which subsystems can work together in different driving conditions to avoid accident, a complete accident analysis has been achieved based on the Hungarian police, insurance companies and accident experts database as well. The analysis of the accident proves us to use and integrate active subsystems in several driving conditions.This paper introduces the result of the accident analysis, the investigation of using active safety systems alone or integrated in different driving conditions to avoid…

Estimation of Tire-Road Friction on Heavy Vehicles

Budapest University of Technology and Economics-Árpád Mészáros-Komáromy, Balézs Trencséni, Péter Koleszér, István Wahl
  • Technical Paper
  • 2004-05-0141
Published 2004-05-23 by Society of Automotive Engineers of Korea in South Korea
Lots of techniques have been developed to assist drivers to drive under safe conditions. To support and improve active safety systems like ABS or ESP, a tire-road friction estimation logic has been developed. The sensors used to get the friction-related parameters are existing ones on modern vehicles. The supplied signals are steering angle, lateral acceleration, yaw rate, brake pressure, engine revolution, wheel speeds, air-spring pressure and some others. An adaptive estimator is presented for calculating road friction coefficient values from measured signals. Finally, demonstration examples show the results of the proposed approach.

Rollover Stability Control for Heavy Vehicles by Using LPV Model

Budapest University of Technology and Economics-Istvan Szaszi
Hungarian Academy of Sciences,-Peter Gaspar, Jozsef Bokor
  • Technical Paper
  • 2004-35-0052
Published 2004-04-19 by University of Salerno in Italy
The paper is concerned with the use of active roll control systems employing active anti-roll bars in order to improve the roll stability of heavy vehicles. Since the forward velocity of the vehicle changes in time, the combined yaw-roll dynamic model has a nonlinear structure. Selecting the velocity as a scheduling parameter, a Linear Parameter Varying (LPV) model is constructed. In the control design based on an LPV method, the changes in the forward velocity and both the performance requirements and the model uncertainties are taken into consideration. The control design is demonstrated in different situations.

Active Suspension Design Using LPV Control

Budapest University of Technology and Economics-Istvan Szaszi
Hungarian Academy of Sciences,-Peter Gaspar, Jozsef Bokor
  • Technical Paper
  • 2004-35-0065
Published 2004-04-19 by University of Salerno in Italy
In the paper the linear parameter varying (LPV) method is applied to the modelling and control of active suspension systems. The suspension structure contains nonlinear components, i.e., actuator dynamics and the dynamics of the dampings and the springs. The model is augmented with weighting functions specified by the performance demands and the uncertainty assumption. By selecting scheduling parameters an LPV model is generated in which the model structure is nonlinear in the parameters but linear in the states. The design of the active suspension is illustrated in the demonstration example.