2.7.12. Cars with catalytic converter in system of production of the fulfilled gases
Cars of Hyundai are serially equipped with catalytic converter. Availability of catalytic converter demands obligatory use of unleaded gasoline. Cars with operated catalytic converter should be besides equipped with the device of an adjustable smeseobrazovaniye.
The device of an adjustable smeseobrazovaniye is understood as system of injection of fuel in which the relation fuel / air can constantly change depending on service conditions and the content of oxygen in the fulfilled gases.
Management teams the device of a smeseobrazovaniye are received from the sensor of concentration of oxygen by (lambda probe) which is established before catalytic converter or in a final collector and is blown by a stream of exhaust gases, the lambda probe is the electric sensor which is registering the residual content of oxygen in fulfilled gases and giving out the corresponding electric signal. The size of a signal allows to draw a conclusion on structure of a working mix. In fractions of a second the lambda probe can give out the corresponding signal on the electronic control unit, at the expense of it the structure of a working mix can constantly be corrected. It on the one hand is necessary, as service conditions (for example, full gas, idling), on the other hand constantly change because optimum reburning occurs in catalytic converter only if in the fulfilled gases there is enough of particles of carbon (not burned down gasoline).
So that at temperature +300... +800 °C in catalytic converter in general could occur reburning, the fulfilled gases should contain bigger amount of fuel, than it is required for complete combustion in engine cylinders. In this regard, at operation of the car equipped with the engine with catalytic converter, fuel consumption increases approximately by 5 %. Catalytic converter is in a motor compartment of the car on a place of the forward exhaust silencer. Catalytic converter consists of the ceramic cellular block covered with noble metal catalyst: platinum or rhodium. For fastening of the ceramic block sensitive to blows the elastic heat resisting wire grid is used.
Used catalytic converter represents the so-called 3rd componental catalyst. It means that in converter at the same time there is an oxidation of an oxide of carbon (WITH) and hydrocarbons (SN), and also reduction of the content of oxides of nitrogen (NOx).