Chassis & Body

Drive Train

On-board energy generation

Preliminary Specs

3D renders & Movies

HOST at the International Lisbon Auto Show 2006

HOST at the Exhibition of Knowldge and Innovation


The Human Oriented Sustainable Transport

  On-board Energy Generation

Power generation on-board

A combustion engine allows for 24h autonomy, as refuelling can be done in less than 5 minutes at the same time that powers all the electrical equipment installed on-board, either for propulsion, control, safety or comfort features

The engine was selected to provide the energy required to accomplish with the selected missions. In its initial configuration HOST will be equipped with the well-known and very efficient MCC Smart Diesel unit, an all-aluminium, 800cm3, turbo-charged common-rail injected engine which is capable of securing a full day of urban range to HOST with a fuel tank of not bigger than that of a normal car, even in spite of HOSTís curb weight clearly over 4 tons.


This result is only possible due to the combination of the best possible hybridizing technology with one of the most fuel efficient engines available for sale in the market. For the engine the working environment is not very demanding: working steadily at a constant speed of 1800rpm and at 25 to 75% load of the accelerator pedal the engine is almost always at peak efficiency, but variations of speed are inexistent and load changes are done progressively. This should be enough to ensure a long and un-stressful life to the engine. It is another feature guaranteeing a very low fuel consumption


A generator is connected to the combustion engine to convert the mechanical energy into electricity supplied to the batteries. A 20kW generator/motor is located in the position usually occupied by the gearbox, which is also capable of cranking up the engine.

Future alternatives

In the series hybrid-electric configuration, chemical energy supplied by a fossil fuel is converted into mechanical energy in the combustion engine, which is then converted into electricity in the generator. In spite of achieving overall cycle efficiencies around 29-30% (which is very good compared to typical 18-19% cycle efficiencies of conventional vehicles) HOST might be further improved if the chemical energy content of the fuel can be converted into electricity in a unique device.

This is possible to achieve in a free-piston engine converter, FPEC, which has two combustion chambers at opposing ends and a linearly moving piston inside a hollow shaft. Wrapped around this shaft is a set of spirals which convert directly the movement of the linear movement into electrical current..


The peak efficiency of HOSTís conventional system, which is around 92%x38% = 35% is therefore improved to almost 45%, while the space occupied by the packages (FPEC engine vs. Diesel engine+Generator) can be reduced by almost 50% and with a much higher freedom in the positioning of the components.