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Next generation use-cases of wireless IP networks, including especially the Massive Machine Type Communications and IoT applications for the distribution of sensory and similar data will require the capability to handle large number of connections while maintaining a low-power footprint in order to function efficiently during long-term deployments. The reduction of the packetisation overhead resulting...
Electric vehicles offer the capability to recover energy by electric braking and therefore to extend the range. Generally, the total demanded brake force of a vehicle is divided and allocated to the front and the rear wheels due to safety and stability issues. Consequently, common electric vehicles with only one central electric machine which drives one axle cannot exhaust the whole potential of recuperation...
This paper is intended as the second part of a two paper series that evaluate the efficiency of a battery pack with charger that has an integrated cell balancing solution. In the first paper a simple passive balancing with a half bridge charger was designed and tested for energy efficiency. This paper continues the work by redesigning the half bridge charger circuit to implement a miilti secondary...
In this paper, a mathematical model for calculating regenerative braking (RB) energy considering the time-varying efficiency of a common electric vehicle (EV) is presented, taking into account environmental conditions. The contribution factor (CF) for estimating the impact of the RB system on the total consumed energy is calculated. To validate the calculated CF, a Blade Electron EV (Converted Hyundai...
On smartphones and tablets, displays consume the majority of battery energy. To extend the battery life, one may choose to dim the brightness level of the display but suffer from user experience compromise as a result. To regain the user experience while extending battery life, we at MediaTek have developed a suite of video processing technologies, MiraVision™ SmartScreen, highly integrated into the...
In the last few years, several Li-ion battery technologies have been studied and developed for their use in electric vehicles (EVs). Among them, lithium iron phosphate (LFP) batteries are considered a promising battery technology for EVs, due to their key advantages, such as cycle life, efficiency, and reliability, to name a few. This paper evaluates several commercial LFP batteries, studied under...
In this article, the driving performance of two electric vehicles of the latest generation clean powertrain cars is evaluated. The vehicles under test are an electric Peugeot iOn, and an AGV electric version of the Ford Transit Connect. For different torque-speed operating conditions at wheel level, the vehicles are evaluated for their battery to wheel — electrical to mechanical — power conversion...
This paper presents an energy and environmental characterization of the two most relevant Plug-in Hybrid Electric Vehicles available in the market (Opel Ampera and Toyota Prius Plug-in), in order to provide an estimate of fuel and electricity consumption, tailpipe emissions and charge depleting mode mileage for any drive cycle studied, based on vehicle specific power methodology. These vehicles were...
This paper presents HypoEnergy, a framework for extending the hybrid battery-supercapacitor power supply lifetime. HypoEnergy combines high energy density and reliable workload supportability of an electrochemical battery with high power density and high number of recharge cycles of supercapacitors. The lifetime optimizations consider nonlinear battery characteristics and supercapacitors' charging...
In this paper, an energy efficient adaptive modulation scheme is proposed for a wireless cognitive radio ad hoc network, where each node is equipped with cognitive radio and the network is an OFDMA system operating on time slots. In each slot, the users with new traffic demand will sense the spectrum and locate the available subcarrier set. Then they choose subcarriers with favorable channel condition...
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