EMISSION CONTROL SYSTEM


  1. OUTLINE


    1. Three-Way Catalytic converters (TWCs) are used to reduce exhaust gas emissions.

    2. The ECM performs air fuel ratio feedback control based on signals from the air fuel ratio sensor and the heated oxygen sensor, and controls the fuel injection amount so that the air fuel ratio comes close to the stoichiometric air fuel ratio, at which the highest purifying efficiency of CO, HC and NOx is obtained.

    3. A blowby gas ventilation system, which efficiently ventilates blowby gas containing HC from the crankcase, is used.

    4. Evaporative emission control, which regulates the purge flow of evaporative emissions (HC) in the canister in accordance with the engine conditions, is used.

    5. Air fuel ratio sensor and heated oxygen sensor heater control, which maintains the temperature of the respective sensors at an appropriate level, is used to improve the detection accuracy of oxygen concentration in exhaust gas.