Changes to the combustion chambers, intake manifold, camshaft and ignition system form the main control system.
The changes listed above have been combined into an efficient system that manages emissions control while maintaining good engine handling and fuel economy.
Air/Fuel Ratio Control System
(port fuel injection system (MFI))
Using signals from the oxygen sensor, the multiport fuel injection system (MFI) controls the start of opening and the duration of the open state of the injector installed in the intake manifold for each cylinder, so as to provide an optimal composition of the air-fuel mixture and reduce the toxicity of exhaust gases.
Due to this, the exhaust gases produced by the engine are specially formulated to allow the use of a three-way 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 (SO) and 3 nitrogen oxides (NOx)) into harmless substances.
Multiport fuel injection system (MFI) can work in two modes:
- air-fuel ratio open-loop control («open-loop») 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 of the oxygen sensor entering the electronic engine control unit.