All models are equipped with a crankcase collection system, a catalytic converter, an exhaust gas recirculation system and a fuel vapor collection system. On some models, an additional air supply system is installed to reduce exhaust toxicity when the engine warms up.
Crankcase GAS COLLECTION SYSTEM
This system serves to collect crankcase gases and oil vapors from the crankcase and direct them to the engine intake tracts for combustion in subsequent engine cycles.
EMISSION CONTROL SYSTEM
To reduce exhaust toxicity, a catalytic converter is installed on all models. Information from an oxygen sensor in the exhaust manifold or downpipe is used to fine-tune the fuel mixture.
FUEL VAPOR RECOVERY SYSTEM
This system serves to collect fuel vapors from the fuel tank into a special carbon filter. From where they are then sent to the engine intake ports for subsequent combustion during normal engine operation.
EXHAUST GAS RECIRCULATION SYSTEM
This system serves to direct part of the exhaust gases into the intake tracts of the engine in order to reduce the CO content in the exhaust gases. The valve of the recirculation system is controlled by the electronic engine control unit.
AUXILIARY AIR SUPPLY SYSTEM
An electric fan forces air into the exhaust manifold under certain engine operating conditions. This improves the combustion of hydrocarbons and increases the temperature of the exhaust gases. As a result, the catalytic converter warms up faster to the required temperature to neutralize the exhaust gases.
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