Glossary – Definitions
Natural gas – Vehicle fuel

Biogas

Raw gas resulting from the fermentation of organic waste, whose composition can vary widely.

Biomethane

Biogas purified to the minimum quality required for injection into the natural gas network.

Close-Coupled

The positioning of an aftertreatment system as close as possible to the engine to limit heat loss, rather than under the vehicle floor.

OBD (On Board Diagnostic )

On-board system (hardware and software) to monitor the correct operation of all processes involved in controlling exhaust pollutant emissions.

Lean burn

Combustion in which the mass quantity of air consumed is greater than the quantity corresponding to stoichiometry: in this case, we speak of...