Solaris Urbino Hybrid

The hybrid system of the Solaris Urbino 12 Hybrid was designed especially for buses of up to twelve metres length and its parameters are tailored to city bus operation.

In this parallel hybrid system, an electric engine recuperates energy during braking and stores it in lithium-ion batteries. When the bus accelerates again, this energy is put to use. The electric motor’s peak output is 44 kW. The four lithium-ion batteries used for energy storage are mounted under seats, minimising the space occupied by the hybrid system. They have a nominal voltage of 340 V and are fed exclusively by the electric engine, so there is no need to plug the bus into an external power supply.

With peak power requirements being met electrically, the diesel engine has been downsized to reflect the reduced load. The Solaris Urbino 12 Hybrid uses a 6.7-litre Cummins diesel engine rated at 162 kW (220 PS). This diesel engine meets the demanding EEV emissions standard. The Eaton hybrid system is matched to an automated six-speed gearbox. Here, the power supplied by the two engines is combined and transmitted to the rear axle of the Solaris Urbino 12 Hybrid.