There are three systems for reducing toxicity.
- (1) Forced crankcase ventilation system
- (2) Evaporative Emission System
- (3) Exhaust gas cleaning system
To ensure the correct operation of the emission control systems, it is recommended that these systems be checked and maintained by an authorized Hyundai dealer at the intervals indicated in the periodic maintenance chart in the Service Book.
1. Forced crankcase ventilation system
The positive crankcase ventilation system is designed to prevent air pollution caused by crankcase blow-by. This system ensures that fresh air enters the engine crankcase through the air filter. Inside the crankcase, fresh air mixes with crankcase gases and passes through the positive crankcase ventilation valve (PCV) into the intake system.
2. Evaporative Emission System
The EVAP system is designed to prevent fuel vapor from entering the atmosphere.
Adsorber
When the engine is not running, fuel vapors accumulated in the fuel tank are adsorbed and stored in the canister. During engine operation, adsorbed fuel vapors from the canister enter the intake system through the canister purge solenoid valve.
Canister purge solenoid valve
The adsorber purge solenoid valve is controlled by an electronic control unit; when the engine coolant temperature is low and while the engine is idling, it closes to prevent vaporized fuel from entering the intake manifold. After the engine warms up, while driving under normal conditions, it opens and passes the evaporated fuel into the intake manifold,
3. Exhaust gas cleaning system
The exhaust aftertreatment system is a highly efficient system that manages the composition of the exhaust gases and maintains optimum engine performance.