Wolf ISLANDER - Environmental Protection Device

15
USER’S MANUAL
Instructions to Users
Environmental protection device
Emission Standards of vehicles (Stage III , under the running mode)
Unit:g/km
Emitted pollutants
Two-wheel vehicles
CO
2.0
HC
0.8
NOx
0.15
Emission Standards of Mopeds (Stage III , under the running mode)
Unit:g/km
Emitted pollutants
Two-wheel moped
CO
1.0
HC + NOx
1.2
Limits of exhaust pollutants of scooter /mopeds under idle conditions
In case of idle type approval test, the volume concentration of emitted CO is
≤3.8%; and the volume concentration of emitted HC is ≤800×10-6;
In case of Production consistency check test, the volume concentration of
emitted CO is ≤4.0%; and the volume concentration of emitted HC is
≤1000×10-6.
The environmental protection device is mainly a
two-in-one air compensating valve (air pump) combining
a one-way leaf valve and a secondary air control valve.
. By making use of the engines vacuum pulsation, the air
pump controls the amount of air needed to enter the
exhaust port through the one-way leaf valve and the
secondary air control valve. This fresh air enters the
exhaust passage of the engine under the action of the air
pump. Unburned fuel vapor discharged from the engine in
its exhaust is then consumed. Thusly this device reduces
the exhaust pollution of the vehicle, and ensures that the
vehicles exhaust meets National Stage III emission
standards.