Great Wall GW491QE, Руководство по обслуживанию

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EF.1-25
(g)Technical฀&characteristic฀parameter
฀฀฀฀฀Limit฀data
M easurement V alue
M in. T ypical M ax .
U nit
L eak age of flow at pressure diff erence 80k pa 9 cm
3
/min
A llow able constant-w ork ing temperature -40 +80
A llow able M ax . fuel temperature +80
A llow able M ax . pressure
drift rev ersible w hen at -30?
-2% +5%
A llow able M ax . pressure
drift rev ersible w hen at +80?
-5% +2%
P eak value of allow able M ax . acceleration 100 m/s
2
A llow able M ax . pulse value
of pressure at air inlet mouth
100 k P a
Performance฀data
M easuremen
R ated pressure difference at flow capacity Q =80 1/h
V ariable value of working pressure when the flow is
changed within 15~140 1/h
S cope of flow
S lope of characteristic curve
(b)Installation฀position:On฀the฀vacuum฀pipeline฀of฀inlet฀manifold฀for฀carbon-
canister.
(c)Cause฀of฀general฀failures:Rust,฀corrosion,฀or฀bad฀sealing฀performance
caused฀by฀foreign฀materials฀inside฀the฀valve;
(d)Symptom:inferior฀idle-speed,฀failure฀of฀function,฀etc.
(e)Precautions฀to฀maintenance:
฀-The฀direction฀of฀air฀flow฀shall฀conform฀to฀relevant฀stipulations฀during
installation;
-Check฀the฀condition฀of฀carbon-canister฀whereby฀its฀control฀valve฀needs฀to
be฀changed฀due฀to฀its฀failure฀caused฀by฀the฀blockage฀of฀black฀grains฀inside
valve฀body;
฀-Prevent฀liquid฀(eg.฀water฀or฀oil)฀from฀entering฀the฀valve฀during฀maintenance;
- To฀avoid฀the฀transmission฀of฀solid฀borne฀sound,฀it’s฀recommended฀to฀have
฀the฀carbon-canister฀control฀valve฀handged฀&installed฀onto฀hose.
(f)Simple฀measurement฀method:
(after฀disconnection฀of฀joint)฀Have฀the฀digital฀multimeter฀adjusted฀to฀th
ohm position,฀and฀connect฀two฀pens฀with฀two฀pins฀of฀carbon-canister
control฀valve฀respectively;฀And฀the฀rated฀resistance฀when฀at฀20 ฀shall฀be
(
)
P฀denotes฀the฀difference฀between฀atmospheric
pressure฀Pu฀and฀the฀inlet-air฀pressure฀Ps.
1.฀fuel฀gas฀coming฀from฀oil฀tank
2.฀carbon-canister
3.฀ambient฀atmospheric฀pressure
4.฀ TEV฀ valve
5.฀Pipeline฀of฀regenerated฀air฀flow
6.฀throttle฀valve฀of฀inlet฀manifold
United฀Electronic฀engine฀management฀system-Analysis฀of฀function฀/principal฀/
failure฀for฀system฀parts฀&components
Value
Min. Typical Max.
Unit
300
kPa
kPa
L/h
kPa/L/h
17.5
220
0.14
10
14. Carbon-canister control valve TEV
(a)Principal
：
The carbon-canister within the fuel evaporation control
system is used to absorb the evaporated gas coming from fuel tank
until it saturated; And the electronic controller is usedto control the
opening of carbon-canister control valve so that a regenerated air flow,
formed by fresh air and saturated &evaporated gas inside
carbon-canisteruel, could be induced to the air inlet pipe of engine;
Depeneding on various working conditions of engine, the electronic
controller may change the occupation rate of pulse signal transmitted
to the electromagnetic coils inside carbon-canister control valve, and
perform a control over the flow capacity of regenerated air flow. Besides,
such flow capacity will also be affected by the difference of pressure
on
two ends.
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