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1.7.24. System of decrease in toxicity

There are three systems of decrease in toxicity:
1. System of compulsory ventilation of a case.
2. System of catching by fuel vapors.
3. System of purification of the fulfilled gases.

System of compulsory ventilation of a case
The system of compulsory ventilation of a case is developed for prevention of the air pollution caused by break of crankcase gases. This system provides intake of fresh air in an engine case via the air filter. In a case fresh air mixes up with crankcase gases and gets via the valve of compulsory ventilation of a case (PCV) to system of an admission.

System of catching of vapors of fuel
The system of catching is intended by vapors of fuel for prevention of hit of vapors of fuel in the atmosphere.

Adsorber
When the engine does not work, the fuel vapors collecting in the fuel tank are adsorbed and stored in an adsorber. In operating time of the engine the adsorbed fuel vapors from an adsorber get to system of an admission via the electromagnetic valve of a purge of an adsorber.

Electromagnetic valve of a purge of an adsorber
The control of the electromagnetic valve of a purge of an adsorber exercises an electronic control unit; when temperature of cooling liquid of the engine low and in operating time of the engine on idling turns, it is closed that the evaporated fuel did not get to an inlet collector. After warming up of the engine, during the movement in usual conditions it opens and passes the evaporated fuel in an inlet collector.

System of purification of the fulfilled gases
The system of purification of the fulfilled gases is the highly effective system operating composition of the fulfilled gases and supporting optimum characteristics of the engine.

Catalytic converter of the fulfilled gases (for the petrol engine)

Fig. 1.191. Catalytic converter of the fulfilled gases



Catalytic converter – a part of a control system of emission of the fulfilled gases. It deletes some products of issue of the engine from exhaust gases. Catalytic converter resembles the muffler superficially and is located in the lower part of the car in system of release.
The fulfilled gases, passing through catalytic converter, strongly it is heated. Hit of a large amount of not burned down fuel in catalytic converter can lead to its ignition.
It is necessary to follow the service regulations of catalytic converter given below.
Use only unleaded gasoline.
Support the engine in good technical condition. Excessively high temperature of converter can lead to misoperation of electric equipment, systems of ignition or injection of fuel.
You do not go by the car at very low level of fuel. If fuel is spent completely, there can be interruptions in ignition and an overload of catalytic converter of the fulfilled gases.
Do not allow operation of the engine on idling turns more than 10 min.
It is not necessary to start the car engine by towage. It can lead to damage of catalytic converter of the fulfilled gases.
Avoid the parking in places where hot details of system of production of the fulfilled gases can contact to flammable materials or objects, for example to dry fallen leaves or a grass. It can lead to their ignition.
Do not concern catalytic converter or other details of system of release when the engine works as they strongly heat up.