Our innovative technology briefly explained.
We pave the way for intelligent energy management everyone can benefit from.
The courage to try something new is the best drive. MAN EfficientHybrid, for example, puts you three times ahead: fewer pollutant and noise emissions, lower fuel consumption and less wear. All this is achieved by a well thought-out system that uses energy that would otherwise be wasted.
Space for innovation
A robust and wear-free electric motor is used between the engine and the gearbox. It serves as a crankshaft starter generator and – together with an UltraCap energy accumulator system placed on the roof and a smart control system – increases the energy efficiency of your buses.
A hybrid through and through
By the way: City buses with MAN EfficientHybrid are officially registered as hybrid buses. This is a clear advantage for every city – also paying off in terms of image.
It is connected to the flywheel housing of the engine and works both as a generator and as an electric starter.
Since the conventional starter is not needed for these starting processes, its service life is significantly extended.
When the bus brakes, it generates electricity through the resulting mechanical energy.
When starting, it converts the previously gathered electrical energy back into kinetic energy.
The 48 volt UltraCap energy accumulator is made up of multiple individual cells with high-performance capacitors.
The high-performance capacitors are able to store and release high amounts of electrical energy particularly quickly. Plus, they are lighter and more compact than conventional rechargeable batteries.
Here, electrical energy is stored electrostatically, this means without chemical processes as with conventional batteries.
The self-learning energy management system uses energy where it is needed most.
While stopped, it supplies the vehicle electrical system. While driving, it supports – depending on the amount of stored electricity – the diesel engine with electric drive power.
The goal: maximum possible savings in fuel consumption and pollutant emissions.
When the vehicle slows down before coming to a halt at a red light or the next station, the crankshaft starter generator converts the generated brake energy into electrical energy (1). The electricity gathered in this process is then safely stored in the high-performance capacitors of the UltraCap module.
While the vehicle is at standstill, the MAN EfficientHybrid system turns off the combustion engine (2). At the same time, the UltraCap accumulator takes over the supply of the vehicle electrical system. All functions, such as opening and closing of the doors, operation of the interior lighting and the ventilation are now supplied with power by the accumulator.
Once driving off again, the crankshaft starter generator uses the available energy from the UltraCap capacitors to start the combustion engine.
If sufficient energy is available in the UltraCap module, the EfficientHybrid system also supplies the vehicle electrical system with power while driving (3). In addition, the crankshaft starter generator can use excess stored energy to act as an additional hybrid drive and thereby take some of the load off the combustion engine.
|Storage capacity Ultra-Cap energy accumulator||40 Wh|
|Crankshaft starter generator (CSG) or integrated starter generator (ISG)||Three-phase reluctance machine|
|Cooling system||Air cooling|
|Max. output||12 kW|
|Max. torque||220 Nm|
|Additional weight||170 kg|
|Registration as hybrid vehicle||Yes|
|Supply of the vehicle electrical system||Yes|
|Support for the combustion engine||Yes|