Section
Ⅴ
fuel vapor gathering system
The function of fuel vapor gathering system
A great lot fuel will evaporate when the fuel heat up by running circumstance( hot summer) or fulsome
surge(running on a long rough road) or be heated up during the fuel injector circulation .if vent these steam out,
not only waste fuel but also easy to arose fire
，
also the car will get stagnation of movement by vent exhaust gas
over the environmental protection prescribed value.. For this reason, fuel vapor gathering system be installed on
the electronic spurt eco-friendly car. This system suck the fuel steam into cylinder over again, avoid occurring bad
phenomena.
Fuel vapor gathering system struction
when the oil tank produce fuel steam, and the steam pressure over the atmospheric pressure, fuel steam will
enter into the activated carbon jar which connected with atmosphere.3
，
fuel molecule will be absorbed by
activated carbon. When the engine running , computer control emission valve open, because the air inlet pipe
vacuum suction ,atmosphere from activated carbon jar 3 enter into air inlet pipe by through the emission control
valve 4, fresh air takes away the absorbed fuel molecule entering into the cylinder for burning after through
activated carbon jar 3.
Fuel vapor gathering system is a supplement to the gas handing system, when the carbon jar emission valve
open, computer will control decreasing the air input of the main air intake.
Fuel vapor gathering system also is a supplement to the fuel feeding system, when the emission valve open,
computer will control decreasing the oil spout of the oil spout machine.
Corresponding to the one operating condition of the engine, mixed consistence and air input is changeless.
parts constitution and working principle
This system is used for prohibiting exhaust oil of car oil system to the atmosphere.. when the engine stop
working, this system save the fuel steam in a jar fulling of activated carbon, when the engine work, the fuel steam
which inside the carbon jar enter into the engine burning with the atmosphere from outside.
1. Canister
Picture showing on the right side.
2. Control valve actuator
1
）
diagram and stitch
Stitch: There are two stitches, one is to contact No 87 stitch of output end of main relay, and the other is to contact
No 46 stitch of ECU.
2
）
Working Principle
Canister is made up of magnet coil, armature and valve. There is a filter at the entrance. The air flow rate
which transfluxes carbon jar control valve is related to the duty ratio of the electrical pulse which ECU output to
the carbon jar control valve on one side; and on the other side, it is related to the pressure difference between
carbon jar control valve entrance and exit.
3
）
Technical characteristic parameter
Value
Item
Min Typical Max
Unit
Rating Voltage
13.5
V
+20
o
C resistance
26
Ω
Current under Rating Voltage
0.5
A
Frequency of impulse Control
30
Hz
Width of Impulse Control
7
Ms
