. Fuel Cell

The fuel cell is of the PEM type, and the two stacks are capable of providing a total gross power of 250 kW. The DC current produced is converted into AC in an inverter before being fed to the main electric engine (Fig. 3). In order to ensure the simplicity of the system, all other electrical components are supplied from the main engine.

1.1. Engine and Power Train

The electrical traction engine is placed in the same position as in a conventional bus (Fig. 4). It is designed to a maximum power of 205kW, comparable to the power of conventional diesel and natural gas city buses.

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The rear axle and automatic transmission are similar to the ones used in the conventional Citaro model, the changes are essentially in the gearbox gear ratios, which have been adapted for the specific characteristics of the engine. The presence of the gearbox ensures an easier adaptation of the drivers.

Exhaust Air

fresh Air

with wster

Cooler

vapor

Compressor

/

A

/* – • І

Cooling water

Expander *

f Pump,

V.

‘* Ш t ;

f

Efeetric

Current(AG)

Fuel Ceil

Inverter

Electrics!

Stack

Traction

Engine

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