The project design of wireless charging platform for electric buses in Ronggui, Shunde

Short Description:

In China, petrol and diesel vehicle sale ban will soon be implemented. According to current examples of some European countries, the ban will be put into practice as early as in 2025, which means vehicles running on the roads will be powered by electricity. A large number of electric buses have been applied in Ronggui, Shunde, reflecting its foresight in public transportation systems nationwide. Nowadays, development of electric vehicles involves building charging piles station. With proper operation and centralized management, charging becomes practical and reliable. However, there exist differences between the use of city buses and other electric vehicles, layover time and dwell time, which provide buses with opportunities for charging. At present, charging piles are built in the station. Whenever vehicles need to be connected to or disconnected from the piles, drivers have to get off and handle the cable in person. Suppose wireless charging piles are applied and buses can be powered as long as they stop at a certain place. Much time will be saved and more opportunities for charging are provided. Wireless charging piles can bring along far more convenience than we can ever imagine. Still, charging an electric vehicle is never an easy task. The capacity of electric vehicles batteries is large, resulting in long charging time. What’s more, vehicles need to be around charging pillars when charged. As passengers, we will not fully understand how difficult it is. What mentioned above drives us to wonder how to improve charging systems for electric buses. We come up with three ways: to get charged whenever and wherever possible, to charge large capacity batteries and to switch freely between wireless and cable charging.

Organization: Rongshan Middle School of Shunde Innovator(s): Zhao Fabao, Li Furong, Wu Jingxian Category: Transport and Logistics Country: China

Purpose of Experiment: In order to complete the charging of every electrical bus quickly via wireless charging, batteries have to be improved, which means they need to be fully charged within a minute. Meanwhile, the charging way is to be changed from being fixed to flexible. Steps: 1. Under the guidance of teacher, we got to know electromagnetic induction. However, when it comes to producing voltage across a conductor placed in a changing magnetic field, its result is not as it is expected. Therefore, we would like to make a test with a model. 2. Our idea is to make a 500-meter road, with coils laid 20-30 centimeters beneath. When an electric vehicle passes the “road”, it has two options. One is to run along the road in 20-30 seconds, and it will be charged by 50%. The other option is to let the vehicle stop and stay on the road for a minute, and then the battery will be fully charged. Either way, the whole process will be timed by CCTVs, as basis for fee. 3. Design of the model: 1. to make a 25-centimeter road with wood, and lay 6 coils of 12 volts underneath. 2. to make a electronic vehicle without a battery, but with a motor to receive the electricity from coils. 4. The wireless transmitting distance of the model is between 2-3 centimeters. The vehicle runs forward when the motor is powered by a coil. The law of inertia also keeps vehicle running from one coils to another (of six coils). This is just an experimental model, and it still takes at least 10 years to go from here to application. When the day wireless vehicle charging technology becomes part of our life, everything is worthwhile. What’s New: Wireless charging allows you to charge a device without use of a charging cable. It works on the principle of electromagnetic induction, which produces voltage across a conductor placed in a changing magnetic field or a conductor moving through a stationary magnetic field. Inductive coupling will be the bridge between charging piles. 1. The existence of passenger stations, as well as pauses at the stops during driving routes, provides buses with opportunities for charging. 2. By using wireless charging instead of cable charging, drivers don’t have to get off buses to handle power supply. 3. In the times of cable charging, much time is needed due to large battery capacity of buses. However, such time would be saved significantly if wireless charging were applied.