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MERCEDES-BENZ Citaro LE, Mild-hybride, 51 Seats, Euro 6

The Mercedes-Benz Citaro Hybrid is equipped with a 48-volt mild hybrid system that works in conjunction with the standard diesel engine. It is not a fully electric or plug-in hybrid bus, but rather an intelligent energy recovery system designed to improve fuel efficiency and reduce emissions.

Here’s how it works:

* During braking, the system recovers energy that would otherwise be lost.
* This energy is stored in roof-mounted supercapacitors.
* When the bus accelerates or starts from a standstill, the stored energy powers a small electric motor that assists the diesel engine.
* This reduces fuel consumption, lowers CO2 emissions, and provides smoother acceleration.

The hybrid system is a separate 48 V electrical system, independent from the bus’s normal 24 V electrical system. Because it operates at low voltage, it is safe, reliable, and does not require the high-voltage components found in full hybrid or electric buses.
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The bus is always driven by the diesel engine; the electric motor only provides additional assistance during acceleration and does not drive the bus on its own.

This technology typically reduces fuel consumption by around 5–8% in city driving while maintaining the reliability and operational simplicity of a conventional diesel bus.

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