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This paper presents a novel fully electric vehicle layout, consisting of two drivetrains, each of them including a two-speed transmission, for improving vehicle acceleration and gradeability performance. The adoption of two-speed transmissions allows eight different gear state combinations, increasing the possibility of selecting a high-efficiency state for each operating condition. A torque-fill...
Research and development of energy storage systems are almost entirely dominated by the need for continuously increasing their performance, reducing weight, cost, and increasing efficiency. The combination of battery and supercapacitor within the hybrid energy storage system (HESS) involves the management of the power between the two devices. The objective of this study is to develop a novel model...
Individually-controlled power trains of fully electric vehicles present an opportunity to enhance the steady-state and transient cornering response of a car via continuously-acting controllers and enable various "driving modes" to be available. This study investigates the associated potential for energy savings through the minimization of power losses from the motor units via wheel torque...
In the last decade, Hybrid Electric Vehicles (HEVs) have spread worldwide due to their capability to reduce fuel consumption. Several studies focused on the optimisation of the energy management system of hybrid vehicles are available in literature, whilst there are few articles dealing with the drivability and the dynamics of these new powertrain systems. In this paper a ‘Through-the-Road-Parallel...
The electric vehicle is becoming increasingly prevalent as a viable option to replace hydrocarbon fuelled vehicles, and as such the development of high efficiency fully electric drivetrains is a particularly relevant research topic. The drivetrain topology is one of the main focuses of research on fully electric drivetrains, because of the variety of available options. For example, the adoption of...
This paper deals with the advantages of a multi-speed transmission system for an electric axle, in comparison with a single-speed layout. The selection of the gear ratios for the multi-speed application is described in detail for a case study vehicle, for two different electric motor units.
A security pattern describes a particular recurring security problem that arises in specific contexts and presents a well-proven generic solution for it. This paper describes an untraceable secret handshake, a protocol that allows two users to mutually verify another's properties without revealing their identity. The complex security solution is split into smaller parts which are described in an abstract...
Nowadays, wireless sensor networks appear to be mature enough to be used by business applications. These applications rely on trustworthy sensor data to control business processes. In this paper, we propose an approach to assess the trustworthiness of sensor data during their lifecycle, from acquisition at the nodes, through processing, to delivery to business applications. We rely on the subjective...
Although very developed in many sectors (databases, filesystems), access control schemes are still somewhat elusive when it comes to wireless sensor networks. However, it is clear that many WSN systems - such as healthcare and automotive ones - need a controlled access to data that sensor nodes produce, given its high sensitivity. Enforcing access control in wireless sensor networks is a particularly...
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