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2.7.9. System of decrease in toxicity of the fulfilled gases

The maintenance of toxic components in the fulfilled gases (CO, CH, NOX) is controlled by a combination of changes in the engine and addition of special elements of management.
Changes of combustion chambers, inlet collector, the camshaft and system of ignition form the main control system.
The listed above changes were united in effective system which operates decrease in toxicity of the fulfilled gases maintaining good controllability by the engine and fuel profitability.

Control system of composition of fuel-air mix
(system of the distributed injection of fuel (MFI))
Using signals of the oxygen sensor, system of the distributed injection of fuel (MFI) operates the moment of the beginning of opening and duration of an open condition of the nozzle established in an inlet collector for each cylinder so that to provide optimum composition of air-fuel mix and to reduce toxicity of the fulfilled gases.
Thanks to it the fulfilled gases produced by the engine correspond to the special structure giving the chance of use of three-component catalytic converter for decrease in concentration of toxic substances. Catalytic converter is applied to transformation of three groups of harmful substances (1 hydrocarbons (SN), the 2nd carbon oxide (SO) and the 3rd nitrogen oxides (NOh)) to harmless substances.
The system of the distributed injection of fuel (MFI) can work in two modes:
– control without feedback on composition of air-fuel mix ("open-loop") is exercised according to the data which are written down earlier in an electronic control unit by the engine;
– feedback control on composition of air-fuel mix ("closed-loop") is exercised according to the signals of the oxygen sensor coming to an electronic control unit the engine.