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Technical Paper

A Thermal Model for the Comparison of Cooling Concepts of Synchronous Machines for Traction Applications

2022-09-16
2022-24-0005
A thermal model is presented which can be utilized to estimate the resulting temperatures in the components of a PMSM for different operation points and duty cycles. Different model types have been reviewed initially and the presented thermal model is realized in the form of a Lumped Parameter Thermal Model (LPTM). This model type was identified to be the best option for temperature estimations in the early design phase of electric motors. The presented model is designed flexibly, so that it can be used for the evaluation of various cooling system modifications such as different materials or changed temperature limits. For proving its suitability, the model is used herein for a comparison of two cooling systems for electric motors: frame cooling and direct winding cooling. Both systems can be equipped with a supplementary rotor cooling.
Technical Paper

Automation of Road Vehicles Using V2X: An Application to Intersection Automation

2017-03-28
2017-01-0078
Today, automated vehicles mostly rely on ego vehicle sensors such as cameras, radar or LiDAR sensors that are limited in their sensing capability and range. Vehicle-to-everything (V2X) communication has the potential to appropriately complement these sensors and even allow for a cooperative, proactive interaction of vehicles. As such, V2X communication might play a vital role on the way to smart and efficient traffic solutions. In the public funded research project UK Autodrive, we are currently investigating and experimentally evaluating V2X-based applications based on dedicated short range communication (DSRC). Moreover, the novel application intersection priority management (IPM) is part of the research project. IPM aims at automating intersections in such a way that vehicles can pass safely and even more efficiently without the use of traffic lights or signs.
Journal Article

Acoustic Vehicle Alerting Systems (AVAS) - Regulations, Realization and Sound Design Challenges

2016-06-15
2016-01-1784
Vehicles powered by electric machines offer the advantage to be more silent than vehicles equipped with an internal combustion engine. On the one hand, the reduced noise levels enable an improvement of the inner-city noise pollution. On the other hand, quiet vehicles entail risks not to be acoustically detected by surrounding pedestrians and cyclists in the lower speed range. The emitted noise can easily be masked by the urban background noise. Therefore, the UNECE has founded an informal working group which is currently developing guidelines in terms of an exterior noise required for detecting Quiet Road Transport Vehicles (QRTV). With the introduction of an Acoustic Vehicle Alerting System (AVAS), not only the exterior noise but also the perceived interior noise for an enhanced driving experience can be considered. Nevertheless, car manufactures have a big interest in maintaining their perceived brand identity.
Technical Paper

Traffic Situation Assessment and Intervention Strategy of a Collision Avoidance System based on Galileo Satellite Positioning

2012-04-16
2012-01-0280
Nowadays, collision avoidance systems (CAS) are an intensive research topic since the majority of all traffic accidents are collisions that are caused due to inattention or unadjusted driving behavior of the driver. Up to date prototypic CAS are based on on-board environmental sensors, such as camera or radar systems, that scan the vehicle's surrounding environment in order to assess the situation's hazardousness. The functionality of the used sensors under varying environmental conditions and the limited sensor covering area require an enormous effort to ensure a reliable detection of obstacles, and thus limit the application of the systems. In order to expand the operating field of such systems, a Galileo-based CAS will be developed within the project ‘Galileo above’ (application centre for ground based traffic).
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