(Photo : Flickr.com/epSos.de)
'The design has met the highest safety ranking, a low footprint and extremely low energy consumption, making the vehicle ideal for most people's needs in cities as well as suburban roads,' Dr Perlo notes.
The prototype is a small compact vehicle -- weighting less than 600 kilogrammes (kg) before the installation of the battery pack, and with a top speed of over 100 km/h -- which meets new regulations on 'micro' electric vehicles.
Aerodynamic, safe and solar-powered
A parallel project called 'Building blocks concepts for efficient and safe multiuse urban electrical vehicles' (WIDE-MOB), also involving the P-MOB partners, helped address the design and development of the basic building blocks of electric vehicles. The WIDE-MOB team worked on optimised aerodynamics to radically reduce the drag at any speed and lightweight and low-cost bodies designed for high safety in the event of a frontal or lateral crash, as well as a variety of technologies for distributed propulsion.
'Our vehicle is the first with a two-motor powertrain with one motor per axle. We have two doors on one side only ensuring a high degree of safety, better ergonomics and reduced complexity with extremely low aerodynamic drag: around 30% lower than other vehicles of the same dimensions,' Dr Perlo explains. 'All the technologies were developed during the course of the project by the partners. Only the battery cells were produced outside Europe, though the design came from within the project.'
The project's integrated ICT-based control systems allow for the operation of two motors and two differentials -- so the vehicle's front and rear axles are independent, providing effective four-wheel drive -- as well as variation of the torque ratio, depending on driving conditions, which provides a variety of important benefits. It increases vehicle control on small radius curves, improves adherence on wet and icy roads, provides the impression of faster acceleration without drawing more power and allows for fail-safe operation: if one motor fails the other will always allow you to return home. Most significantly, this in turn ensures that a single motor failure will not cause loss of control of the vehicle, particularly at high speeds.
In addition, the use of two motors combined with ICT-based smart energy management enables higher efficiency, because the two motors can individually be operated at peak performance in all driving conditions, while maximising energy recovery during braking through distributed braking on two axles combined with virtual 'anti-lock braking system' (ABS) control.
Meanwhile, smart photovoltaic panels with smart diodes and self-adapting electronics minimise loss of energy generation due to shadows or a single malfunctioning cell. Like most electric vehicles, the P-MOB prototype can be charged directly from the electricity grid. The addition of flexible high-efficiency mono-crystalline silicon solar-cell technology, however, means that it can also be powered by the sun alone and can even sell back power to the electricity grid once its batteries are full.
In trials at Fiat's testing track in Turin, the vehicle was able to travel 20 km powered solely by its solar cells -- more than enough for the average European daily commuter, especially in sunnier southern Europe.
'The vehicle's performance met our expectations for the design: it showed very high stability on small radius curves and had an average energy consumption of around 80 Watt-hours per kilometre,' Dr Perlo says. 'We presented it to the public at events in Turin, Athens and Brussels and received very positive feedback.'
'The idea of having a vehicle that with minor additions could meet both the homologation of micro electric vehicles and the classical M1 world is new and is enabling novel business approaches. All these concepts have been patented,' Dr Perlo notes.
Nonetheless, electric vehicle sales in Europe are expected to increase apace, rising from 45,000 this year to 400,000 in 2015, representing around 3.5% of new passenger car registrations. As technology improves, prices will also drop, with a small to mid-sized electric passenger car with a range of 250 km on a single charge predicted to cost EUR 15,000 within four years, down from EUR 20,000 at present. -- © European Union, CORDIS"