Changes to the combustion chambers, intake manifold, camshaft and ignition system form the basic control system.
The above changes have been combined into an effective system that manages emissions while maintaining good engine drivability and fuel economy.
Air-fuel ratio control system
(multi-point fuel injection (MFI) system)
Using signals from the oxygen sensor, the Multiport Fuel Injection (MFI) system controls the timing and duration of the open state of the injector installed in the intake manifold for each cylinder in order to ensure an optimal air-fuel mixture composition and reduce exhaust toxicity.
Due to this, the exhaust gases produced by the engine correspond to a special composition, which makes it possible to use a three-component catalytic converter to reduce the concentration of toxic substances. The catalytic converter is used to convert three groups of harmful substances (1 hydrocarbons (CH), 2 carbon monoxide (CO) and 3 nitrogen oxides (NOx)) into harmless substances.
The multi-point fuel injection (MFI) system can operate in two modes:
- open loop control of air-fuel mixture composition ("open-loop") is carried out in accordance with the data previously recorded in the electronic engine control unit;
- air-fuel ratio feedback control ("closed-loop") is carried out in accordance with the signals from the oxygen sensor received by the electronic engine control unit.