To achieve such high fuel economy, Peugeot and its project partners used technologies previously reserved for competition and luxury models resulting in reduced wieght, improved aerodynamics and incuding Peugeot's innovative HYbrid Air system.
The standard powertrain has been replaced by a hybrid drive system featuring a mix of petrol and compressed air. HYbrid Air technology combines two types of energy to achieve greater efficiency depending on the driving conditions. The compressed air is used to assist and even replace the petrol engine to enable maximum efficiency during transition phases, such as acceleration and starts.
The system comprises:
- a compressed-air tank located below the boot
- a low-pressure tank near the rear axle acting as an expansion chamber
- a hydraulic system consisting of a motor and a pump in the engine bay
In Air (ZEV) mode, the car runs on compressed air alone. This method of driving does not consume fuel and gives off no CO2 emissions, making it ideal for urban environments. In Petrol mode, the car is powered only by the 1.2-litre petrol engine. This is more suitable for travelling at a steady speed on main roads and motorways. The Combined mode is designed for transition phases in urban environments, such as standing starts and acceleration. It draws on the two energy sources in proportions adjusted to achieve optimal fuel consumption.
The compressed-air tank is recharged when slowing down (while braking or taking the foot off the pedal) or by part use of the energy developed by the three-cylinder petrol engine to compress the air. Both methods can achieve maximum pressure in just 10 seconds.
Find out more about the current Peugeot 208 models at Richard Hardie.