Not just battery-powered cars. Electric buses are more and more all over the world and mostly used for public transport. But new vehicles also need new equipment. Tires must be specifically engineered and designed to properly support electric heavy mobility.
It is not yet a real "boom". However, electric mobility becomes increasingly popular year by year. Besides, it is no longer just about cars, but often about heavy vehicles too, and mostly the ones dedicated to public transportation service. The battery-powered electric bus is foreseen to be the first electric vehicle whose market share in the world's leading industrial economy has surpassed the 80%. According to the authors of the report “Electric Bus: A Critical Overview on the Dawn of Its Widespread Uptake”, within 2026 electric buses by Li‐ion batteries and hydrogen fuel cells will be massively present across the world, displacing traditional bus and coaches.
Experiences are already multiplying all over the world. According to recent data published by Statista.com, in 2018 electric buses were about 14% of China’s bus fleet. The country is a world leader for electromobility. Several Chinese cities are replacing fleets with battery power. And the region of Shenzhen is the first in the world to operate a fully electric bus fleet.
On the other side of the world, the marching pace is slower but pressing anyway. A US bill put forward last March allocates 500 billion dollars funds, spread in ten years, for the electrification of national public transport, the purchase of zero-emission busses, and the creation of new charging points for electric vehicles.
And electric mobility applied to public transport is rampant in Europe too. Denmark is leading the race with even 78% of electric city buses, but Luxembourg (67%) and the Netherlands (66%) follow. In the other Scandinavian countries, one in four urban buses is electric, while the share falls under 10% in France, Belgium, Spain, United Kingdom, Germany, Poland, Italy, Greece, and Switzerland (data 2019).
Resolved to win the challenge of electric mobility applied to public transport, Moscow local public transport company Mosgortrans announced the urban fleet of electric buses - currently made up of about 600 vehicles - will be further expanded with a further 400 units by the end of 2021 and so on in the following years. Mosgortrans ensures that the city's public transport will be fully electric by 2030.
New shoes for new vehicles
The widespread of battery-powered heavy vehicles brings sure advantages in terms of energy savings and environmental impact. Nevertheless, this different type of vehicle asks for different and really specific equipment and components too.
To properly equip the electric heavy vehicles, traditional tire construction has to be reviewed. The first element to consider is the greater weight of an EV. That strongly impacts both vehicle handling and braking behavior. To support this increased weight, always ensuring performance and durability, tires need to be strong as well as lightweight.
Such as all the other similar vehicles, electric buses are also exposed to higher torque in moving and accelerating. Therefore, the tires must be developed to withstand this big stress. Then, the deceleration of electric buses in urban traffic is a key factor in the energy recovery process. This, in turn, affects the range of the vehicle. Compared to conventional brake management systems, this recovery process puts a strain on the tires of the driving axles. And that must be considered in EVs' tire development too.
Finally, another factor to consider is noise. Electric vehicles are naturally very quiet. This plus value must not be compromised by the tire rolling. So, reducing noise is another target to achieve in developing a specific tire for electric vehicles.
Aeolus proposal for electric buses: AGB23
Aeolus proposal for electric buses names AGB23. Suitable for all-wheel tires, urban and regional application used, AGB23 ensures a longer mileage with deeper tread depth, a better driving performance due to the design of the 3-pattern groove, improved heat emission with "s" groove and special deeper sipe design, excellent sidewall protection design minimizes damage from the curb; enhanced performance of low rolling resistance and heat generation with high silica and very good fatigue resistance with full penetration cord.TAGS: Sustainability, Global, Technology, Innovation, Tyre industry, Transportation, Logistics, TBR