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In hospitals and care facilities, the care workers have to take care of many patients riding on a wheelchair for a stroll. The welfare vehicles like electric wheelchairs will take important roles not only to improve the quality of life of patients but also to reduce the load of care workers. The platoon driving of the wheelchair systems may become one of the effective leading methods of patients....
The motors and inverters used in the vehicle is increasing. There are high requirement of safety and installation space to the motors and the inverters. The dual winding motor and its parallel control by the two inverters is one of the size reducing technologies which also contribute to the safety with its redundancy. In this paper, inverter size reducing control of the two inverters for the dual...
The present work advances the use of the Nomadic Agent (NA) concept for supporting electro-mobility through the provision of location based information in an urban environment. In the envisaged system, each NA periodically broadcasts relevant data to other mobile nodes representing electric vehicles (EVs) inside its target area. At the same time, it is considered that multiple NAs are deployed to...
In this paper a novel multi-purpose converter for electric vehicles (EVs) is proposed. This topology, optimized for a full electric drive, satisfies propulsion requirements and allows single phase as well as three-phase AC charging. As compared with the onboard integrated chargers on the market today, this topology enables significant cost, weight and volume reductions. The proposed topology is theoretically...
This paper proposes a driving safety evaluation method based on the parameter analysis of a driver model. Since the driving abilities, such as reaction, recognition and judgment time decrease with aging, it is difficult for elderly drivers to avoid the traffic accidents instantly. Therefore, the proactive safety driving is important for the elderly drivers to prevent the accidents. Then, the safety...
This paper discusses the vehicle dynamics control system of an all-wheel-drive electric vehicle with four on-board motors. Each driveline is characterized by complex torsional dynamics caused by the gearbox and the half-shaft located between the electric motor and the wheel. Such a drivetrain configuration can benefit from a specific controller, i.e., the active vibration controller (AVC), which increases...
As the number of Electric Vehicles (EVs) has continuously increased in the last years, due to environmental issues, the interest is to find the maximal penetration rate of EVs, which can meet both, technical and environmental constraints. The technical impacts can be reduced by applying an Energy Management Strategy (EMS), which in the present study increases the maximal allowed EVs' penetration rate...
Wayside supercapacitor based energy storage system (ESS) for urban rail transit can reuse the braking energy and reduce energy consumption. Most ESSs switch over from charging to discharging states based on voltage of DC bus. But open circuit voltage of DC power supply in subway system always changes, which would influence the normal operation of ESS. This paper will show the output characteristic...
This paper evaluates different inverter topologies and modulations, which use hard switching techniques applied to an electric powertrain to reduce inverter losses. Three inverter topologies and three modulation techniques are evaluated through a simulation. Some inverter configurations are in research level and not used commercially on powertrains yet, but are studied to contrast its energy-efficiency...
Steer-by-wire (SBW) system, which is characterized by variable gear ratio, better active safety, unmanned drive, has been widely studied to realize a distinctive driving experience. Control strategy acts as a key part of SBW system to achieve the goal. In this paper, a control strategy by bilateral control structure for steer-by-wire system is proposed. To make SBW system has the same function of...
Detecting an illegally parked vehicle in urban scenes of traffic monitoring system becomes more complex task due to occlusions, lighting changes, and other factors. In this paper, a new framework to detect illegally parked vehicle using dual background model subtraction is presented. In our system, the adaptive background model is generated based on statistical information of pixel intensity that...
This study investigates limitations of driver's compensation under visual field contraction. Two types are distinguished for the compensation: (A) reducing the vehicle speed, and (B) looking around frequently. An experiment using a driving simulator is conducted to evaluate to what extent accidents can be avoided by compensation. The participants are healthy drivers wearing eyeglasses that contract...
This paper provides a novel summarization method for driving data, including a driving video captured by car-mounted camera, vehicle behavior such as velocity, steering angle, and other information. While a large amount of the driving data have been gathered recently, looking back method, however, has not been well-considered. In this paper, we integrate various information from the driving data as...
Flight tests of prototype UAV systems can be restricted by spatial constraints and they may bring risks of damage due to failures. Motivated by these, we presented a simulation approach based on Robot Operating System (ROS) and Gazebo. Unlike other state-of-the-art quadrotor simulators, we implemented the dynamics model of the UAV in ROS to achieve high fidelity behavior of the UAV. A hierarchical...
In electric and hybrid-electric vehicles, the inverter output voltage is limited by available DC-link voltage, which restricts the vehicle speed and acceleration. Therefore the fundamental component of the motor voltage should be increased by operating inverter in the six-step mode at high speeds. Although hysteresis based direct torque control (DTC) is a straightforward approach and has several advantages,...
Aggregators in smart grid are business operators providing services to aggregate and visualize electricity information, balance demand and supply, reduce energy consumption, and do the other activities with Energy Management Systems (EMSs). An aggregator for Apartment Building Energy Management Systems (Apartment-BEMSs) balances demand and supply considering all households in its building. The buildings...
A battery-ultracapacitor Hybrid Energy Storage System (HESS) combines the advantages of both Li-ion batteries and ultracapacitors. Li-ion batteries sustain a relatively long electric only driving range but degrade if exposed to high C-rates and large number of cycles. Ultracapacitors are robust, have a quasi infinite cycle life and can sustain highly dynamic power profiles. This paper proposes a HESS...
This paper proposes an energy management for fuel cell electric vehicle taking into account the fuel cell degradation during its lifetime. The aim of the study is to design a control strategy which manage a power converter in order to use the fuel cell system as a range extender by preventing the batteries state of charge to drop too quickly. The presented controller use both batteries state of charge...
A series-series compensated circuit of the wireless power transmission system has characteristics of increasing charging power during coil misalignment. In order to limit the increasing charging power and to meet the capacity of onboard power converter, this study proposes a constant voltage control with power reference method. The charging power is controlled by adjusting duty ratio of the onboard...
It is expected that the number of electric drive vehicles (EDVs) would grow rapidly in the coming years. Considering cars are parked over 92% of the time, the excess batteries capacity of EVs could be used to support power grid, while they are plugged into the grid. Although this technology, which is called vehicle to grid (V2G), has several benefit, vehicle to building (V2B) systems have a higher...
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