The Mercedes-Benz has even more innovative safety systems. For example, an extinguishing system is installed in the CLS and AMG GT Class 2018. The extinguishing system is situated in the engine compartment. The Mercedes Inerting System prevents an explosive fire propagation. The reason Mercedes-Benz developed the system is the presence of refrigerant R1234YF in the A/C system. R1234YF gas is highly inflammable and could escape after an accident due to damage to the air conditioning system, causing it to ignite with an explosion because of the heat from the engine and exhaust.
CAUTION! Combustion of R1234YF produces caustic and toxic smoke consisting mainly of hydrofluoric acid. R1234YF ignition can be recognised by a bright flash of light.
Illustration: Mercedes-Benz Inerting System
1. Gas generator
R12/69 is a pyrotechnic charge.
Illustration: Pipe from behind the mudguard
The gas generator is filled with Argon, an inert, liquefied, cryogenic gas with an asphyxiating effect (displaces oxygen). The system is activated by the SRS (Supplemental Restraint System). In the event of an accident, the SRS will activate the pyrotechnic charge, allowing the gas to flow into the gas generator. This happens under high pressure. The gas in the engine compartment is released through the piping and the atomiser and expels the oxygen, which prevents the refrigerant from igniting.
CAUTION! A leak of argon gas can cause burns on bare skin and tightness of the chest.
CAUTION! The gas generator in the Inerting System in the CLS is situated behind the right mudguard. By clicking on the gas generator, the first responder is given important information about this gas generator.
Illustration: Mercedes-Benz CLS 4dr Coupe 2018
Using rescue equipment to create space in this position can lead to a dangerous situation. It is not possible to see if the generator has been activated.
Illustration: Position of the gas generator for the CLS Class Inerting System
The SRS (Supplemental Restraint System) activates the Inerting System in the event of an accident, simultaneously with other passive safety systems such as airbags.
Illustration: Mercedes-Benz AMG GT 2018