The Hydrogen Laboratory at Coppe/UFRJ has developed a hybrid power train with fuel cells and batteries to power an urban bus prototype with 12 m and low-floor chassis. Such a system presents itself as an alternative that is more efficient and ecological with respect to the conventional bus power trains that are now in use.


How it Works 


The bus is equipped with an electric power train that possesses three different sources of energy.
The first source is the grid energy that recharges the embarked electric energy storage system by means of connection made to an electric outlet before leaving the garage.

The second source is obtained from a kinetic energy recovery system that is analogous to the ones used in Formula 1 vehicles. Energy from the bus movement is converted into electric energy during deceleration and is stored and used onboard.

The third source comes from the hydrogen stored onboard in pressurized cylinders. Fuel cells are responsible for transforming the chemical energy from the hydrogen contained in the cylinders, by means of an efficient electrochemical reaction with oxygen from the air, into electric energy, which is stored and used onboard, and water vapor, its only waste.




The electric energy stored onboard is used by the electric traction motor, which is responsible to put and keep the bus in movement, and by all other auxiliary devices embarked in the vehicle. The result is a bus that is more efficient energetically, with a smaller level of noise and zero emission of air pollutants.


The first prototype was demonstrated in May 2010 at Aterro do Flamengo, Rio de Janeiro, right after took place at the veihicles' competition Challenge Bibendum. It consisted of a laboratory version of the new system developed.


The second prototype was demonstrated during the Rio + 20 meeting, in June 2012. It included important improvements made in the traction and auxiliary systems, which made the vehicle more efficient in the use of energy.


The third prototype is being demonstrated during the Rio 2016 Olympic Games, in August 2016. All proprietary devices developed for the traction and auxiliary systems were prototyped in pre-commercial versions.






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