Hydrogen bus prototype unveiling at IAA

KEYOU, a clean mobility company leading in hydrogen technologies, and Voith have put together a prototype for a hydrogen-driven city bus. The vehicle will be presented during IAA Transportation 2022 in hall 12, stand F60.

The 12m vehicle is based on a Solaris Urbino 12 chassis and is equipped with a combination of KEYOU-inside hydrogen engine and Voith DIWA NXT mild-hybrid system.

Since 2015, KEYOU has been developing hydrogen-specific technologies, components and combustion processes that can be used to transform conventional combustion engines into emission-free hydrogen engines.

The DIWA NXT automatic transmission for buses is designed as a mild-hybrid system. The central recuperation unit (CRU) recovers electrical energy generated from the driving operation. It delivers peak power up to 35kW at 48V. In this very special concept, Voith changed the main functionality of the CRU to mainly support the start-up procedure of the bus. The combination of hydrogen combustion engine and mild-hybrid system thus creates a new zero-emission mobility that can rely on existing infrastructure. The CRU is integrated into the flywheel housing between the engine and transmission and requires almost no additional installation space.

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