A few days ago, Singapore’s TUM CREATE exhibited a prototype electric taxi codenamed EVA. This vehicle mainly displays the research and development achievements of the company's cooperation projects with Munich University of Technology and Nanyang Technological University.
The EVA prototype vehicle is an interdisciplinary research result that combines energy savings, battery charging, thermal management, and lightweight materials. This car is equipped with a maximum power of 60 kilowatts of motor, peak torque of 223 Newton meters, the maximum speed of 111 km / h, 0-100 km / h acceleration takes 10 seconds. The car is also equipped with a 50 kilowatt-hour battery pack, which contains 216 lithium-ion polymer batteries with a capacity of 63 amps (Ah).
In addition, the car adopts a load-bearing bodywork structure and is entirely made of carbon fiber reinforced polymer material. The body weight is reduced by 150 kg without sacrificing the stiffness and strength of the frame.
The biggest highlight of this car is its super-fast charging system, equipped with two charging ports. It takes only 15 minutes to charge and it will be able to travel about 200 kilometers (based on Singapore's traffic conditions). TUM CREATE's research team stated that under the U.S. FTP 72 standard, a single full charge would allow the car to travel 330 kilometers.
The current obstacles to the fast charging technology of electric vehicles are how to solve the large amount of heat generated during fast charging and how to meet the high voltage required for charging. TUM CREATE engineers targeted the use of more efficient battery thermal management solutions to increase battery pack life.
At the EVS27 electric car conference held in Barcelona, ​​Spain, TUM CREATE engineers performed accelerated aging tests of EVA electric vehicle battery packs on the spot.
The research team stated that its goal is to be able to charge the battery quickly within 20 minutes with a 3C charge and discharge rate. In practical applications, under the condition of frequent fast charging, the cooling system of the battery pack must be sufficiently advanced to maintain the battery temperature at about 28°C. When the battery temperature increases, the battery capacity and power will decay.
In the interior part, engineers at TUM CREATE have designed a personalized overhead air conditioning system that is located above the driver. Its purpose is to reduce the power required for cabin cooling. Ergonomic studies have shown that local cooling of the cabin is sufficient to provide comfort to the driver without the need for temperature control of the entire cabin. Temperature control facilities in other regions can be turned off when they are not necessary, saving energy consumption. Another advantage of the design of regional temperature control is that it prevents bacteria particles from constantly flowing in the car.
The car's seat has also been uniquely designed with passenger comfort as the primary consideration. In addition to the ergonomic design, the seat surface also uses a special moisture absorption and heat regulation system. In addition, the front seats will be folded forward to reveal a child seat for children from 9 months old to 3 years old. This arrangement fills the gaps in inadequate child protection for passengers in traditional taxis.
The entertainment information system in the car supports passengers and drivers to control air-conditioning, voice and other functions through personal mobile devices. The center console panel and dashboard are seamlessly integrated into the on-board system, and multiple displays provide drivers with relevant statistics.
The transport company basically will use the passenger car to re-use the rear seat taxi. However, due to technical limitations, the current electric vehicle's short mileage and long time-consuming charging also determine its role as a taxi driver. Generally, an electric car needs about 8 hours to fully charge. TUM CREATE Company hopes to solve this problem through new technical solutions. Unlike temperate regions, the thermal management system for batteries is particularly important in tropical regions such as Singapore and even in the equatorial belt.
According to Dr. Daniel Gleyzes, project research leader of TUM CREATE, in Singapore, although the air pollution caused by taxis only accounts for 3% of all vehicle pollution, a two-shift taxi still needs to travel about 500 kilometers per day. Taxi as a public transport can play a positive role in reducing emissions.
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