PSA Peugeot Citroën and Bosch is currently developing a new form of hybrid vehicle that combines gasoline-fed internal combustion engine and compressed air storage called 'Hybrid Air' as a replacement for the usual battery pack.


The Hybrid Air is an innovative combination of a gasoline engine, a unit to store energy in the form of compressed air, a hydraulic motor-pump assembly, and an automatic transmission working with an epicyclic gear train. It adapts to the user's driving style and adjusts the drivetrain accordingly to either air, gasoline, or combined.


The 'Hybrid Air' can be seen on Peugeot's B-segment models starting in 2016, while a closely resembling technology called 'Hybrid4' can be expected for C and D segment vehicles.