The principle of operation of the toxicity reduction system (Renault Megane 2)

Communication with the atmosphere of the fuel tank is carried out through the adsorber (fuel vapor trap).

Gasoline vapors are retained by activated carbon contained in the adsorber. Gasoline vapors from the adsorber enter the engine, where they are burned. For this, the absorber is connected to the intake manifold using an electromagnetic valve located on the mudguard cup.

The principle of operation of the electromagnetic valve consists of changing the flow cross-section depending on the signal of the degree of cyclic opening received from the injection system ECU.

The change in the flow cross-section of the channel for fuel vapors in the electromagnetic valve occurs due to the balance between the magnetic field created by the supply voltage of the winding and the force of the return spring, which ensures the closing of the electromagnetic valve.