München, Techn. University, Diss., 2003.

Techn. Universiẗat, Diss., 2005--Darmstadt.

Zugl.: Aachen, Techn. Hochsch., Diss., 2008

Under der senaste år-tiondet har 'X-by-wire' teknologier stadigt introducerats inom kommersiellbiltilverkning. Detta har hänt på grund av de otaliga fördelar dessa teknologier har över derasmekaniska motparter. Huvudskillnaden är att man använder sig av elektro-mekaniska system iställetfor mekaniska förbindelser. I ett 'throttle-by-wire' system till exempel blir positionen av gaspedalenkontrollerad av sensorer och den elektriska aktuatorn föryttar strypan följaktligen. Fördelen är attinformationen som samlas av andra sensorer även kan påverka på hur strypan öppnas. Detta gerextra flexibilitet till mekanismen. Det nästa system bil-manufaktorer vill anpassa till 'by-wire'-systemär bromsarna. Principen här är att flytta bromspedalerna med en elektrisk motor som är placeradi kaliperna och därmed helt byta ut kolvarna och den hydraulkretsen som just nu används för attåstadkomma detta. Att genomföra detta är mödosamt då bromsning ar kritiskt för säkerheten ochdärmed måste fullt följa strikta regulationer. Man måste fortfarande kunna bromsa om strömmen intefungerar i huvudströmkretsen. Biltillverkare har därför undersökt olika backup-system for att kringgådetta problem. Alla möjligheter har sina nackdelar och förvecklar designen en hel del. Detta arbeteutforskar en ny 'brake-by-wire'-design som är härledd från studier av andra undersökta system. Måletav det nya konceptet är att lösa några av de uppmärksammade problem i andra design. Dokumentetbörjar genom att granska redan existerande 'brake-by-wire' teknologier och beskriver deras för-och nackdelar.Vidare kommer det nya konceptet beskrivas med de förbundna fördelarna. Efter det byggsen simulationsmodell for att ta reda på om ideen är möjlig att bygga och skulle fungera. Sedan ritasen CAD-modell av monteringen och ett flertal FEM-studier genomförs för att utvärdera styrkorna avnågra kritiska komponenter. Till slut förfinas modellen och de erhållna resultaten diskuteras. Dessaanvänds för att kritiskt kommentera koncepten och för att ge rekommendationer for möjlig framtidautveckling. / In the last decades or so, \X-by-wire" technologies have been steadily introduced in commercial carsfor the numerous advantages they provide over their mechanical counterparts. The core principleconsists of using electro-mechanical systems instead of mechanical linkages. In a throttle-by-wiresystem for instance, the position of the gas pedal is monitored by a bunch of sensors while an electricactuator moves the throttle accordingly. The advantage is that data gathered by other sensors mayalso inuence the throttle opening, giving extra exibility to the mechanism.The next system automobile manufacturers want to adapt to \by-wire" is the brake. The principleis to move the braking pads with an electric motor located in the calipers and to get completely ridof the pistons and hydraulic circuit currently used to this eect in cars. Nonetheless, the transition isarduous because braking is safety critical and must therefore comply with strict regulations. Indeed,it must still be possible to apply the brakes in case of a power loss on the main electric circuit.Manufacturers have therefore been exploring dierent backup systems to circumvent the issue butthey all present downsides and complicate the design to a great extent.This work studies a new brake-by-wire design whose concept was derived from the study of theother systems presently investigated. The aim of this new concept is to resolve some of the issuesobserved in other designs.This document starts by reviewing the existing brake-by-wire technologies and describing their prosand cons. Next, the new concept is described along with the advantages it may bring. Subsequently,a simulation model is built to assess whether the idea is plausible and can function properly. Later, aCAD model of the assembly is drawn and various FEM studies are conducted to evaluate the strengthof some critical components. Finally, the simulation model is rened and the results obtained arediscussed and used to comment critically the concept and give recommendations for possible futuredevelopments.

Thesis--Technische Universität Dresden, 2007. / Includes bibliographical references.

Universiẗat, Diss., 2002--Stuttgart.

In the fall of 2004, the High Speed Autonomous Vehicle Team, a group of 16 students took on the goal of converting a vehicle to drive-by-wire status. The main goal of this project was to convert a Cadillac SRX donated by General Motors, to fully by-wire control. This thesis presents the HSAVT brake-by-wire and the steer-by-wire solution. In addition, the results of a literary search on drive-by-wire systems are presented. The results of the project proved that the team came up with a solid, effective drive-by-wire vehicle and that the project met all of the primary goals of the project. / Master of Science

<p>The purpose of this master thesis project has been to analyze and document the Sirius 2001 Concept Car. In addition, it has also been a goal to get the car in a usable state by implementing new software on the on board computers. </p><p>The car is a Tiger Cat E1 that is modified with four wheel steering and an advanced X-by-Wire system. The computers in the X-by-Wire system consist of six TTP PowerNodes that communicate with each other over a redundant, fault tolerant TTP/C communications bus. The computers are connected to a number of sensors and actuators to be able to control the car. </p><p>This project has contributed to the car in several ways. A complete documentation of the systems implemented in the car is one. Another is a programmers manual which significantly lowers the threshold when working with the car. Last but not least is the modifications in hardware and software, which have made the car usable and show some of the possibilities with the system. </p><p>The results show that the Sirius 2001 Concept Car is a suitable platform for research in car dynamics and fault tolerant systems. The work has also shown that the TTP/C communication model works well in an application like this.</p>

The purpose of this master thesis project has been to analyze and document the Sirius 2001 Concept Car. In addition, it has also been a goal to get the car in a usable state by implementing new software on the on board computers. The car is a Tiger Cat E1 that is modified with four wheel steering and an advanced X-by-Wire system. The computers in the X-by-Wire system consist of six TTP PowerNodes that communicate with each other over a redundant, fault tolerant TTP/C communications bus. The computers are connected to a number of sensors and actuators to be able to control the car. This project has contributed to the car in several ways. A complete documentation of the systems implemented in the car is one. Another is a programmers manual which significantly lowers the threshold when working with the car. Last but not least is the modifications in hardware and software, which have made the car usable and show some of the possibilities with the system. The results show that the Sirius 2001 Concept Car is a suitable platform for research in car dynamics and fault tolerant systems. The work has also shown that the TTP/C communication model works well in an application like this.

Simulation tools have progressed largely and in modern times they are commonly usedby engineers to design and simulate machines or part of machines before building and deploying them in the field. The field of Hardware-in-the-loop (HIL) is gaining significant interest among companies as they strive to enhance product safety and reliability simul-taneously reducing testing costs and accelerated development speed. This study presents the Real Time simulation improvements effectuated to the Steer and Brake by wire system on an underground face drill rig. These improvements in the model are validated with a comparison between simulated environment and real test data from the machine using a cosimulation between Matlab&amp;Simulink with AMESim. At the end, this improved model is prepared to be compatible with an Hardware-in-the-loop application that requires an adequate computational time.