Waste gas exhaust control system
Waste gas exhaust system
Your vehicle is provided with the
waste gas exhaust system, and has
met the waste gas emission limit
specified by the state. There are
three types of waste gas exhaust
control systems.
(1) crankshaft case emission control
system
(2) evaporation emission control
system
(3) exhaust emission control system
To ensure effective functioning of the
waste gas exhaust system, it is rec鄄
ommended to have the authorized
JAC dealer inspect and maintain the
vehicle according to the maintenance
schedule in this manual.
1. Crankshaft case emission control
system
The forced ventilation system of
crankshaft case can prevent air pol鄄
lution by the mixed gas escaped
from the crankshaft case. This sys鄄
tem supplies filtered fresh air to the
crankshaft case. In the crankshaft
case, the fresh air is mixed with the
escaped air from other cylinder and
then this mixed gas enters the air in鄄
take system via the PCV valve.
2. Evaporation emission control sys鄄
tem
The evaporation emission control sys鄄
tem is designed to prevent loss of
fuel vapor.
3. Exhaust emission control system
The exhaust emission control system
is a high efficiency system, and can
control the waste gas emission and
has the function of maintaining the
vehicle.
Charcoal canister
When the engine is not working, the
fuel vapor produced in the fuel tank
is absorbed and stored in the char鄄
coal canister. When the engine is op鄄
erating, the fuel vapor in the charcoal
canister is pumped into the air intake
system via the purifying control
solenoid valve.
Purifying control solenoid valve
The ECM controls the purifying con鄄
trol solenoid valve; when the temper鄄
ature of engine cooling liquid is low
and the engine is in idling, the valve
closes, so that the vaporized fuel
cannot enter the charcoal canister.
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When the engine gets hot in normal
driving, the valve opens and admits
the vaporized fuel into the charcoal
canister.
EGR system(if installed)
This system controls the NOx by way
of circulated exhaust, to lower the
combustion temperature of the cylin鄄
der.
Three-way catalytic converters
All JAC vehicles are provided with in鄄
tegrated three-way catalytic convert鄄
ers, to reduce the carbon monoxide,
hydrocarbon compounds and nitric
oxygen. The waste gas flowing
through the converter can keep the
device at maximum temperature.
When gasoline having not completely
burnt enters the exhaust system, the
converter will overheat and it may
lead to burning the vehicle.
Caution:
音 It is possible to avoid danger
by observing the following.
Warning:
音 Lead -free gasoline (over
93#) must be used.
音 Take care of the engine so
that it keeps good functions. The
cause of excessively high con鄄
verter temperature is poor func鄄
tioning of electrical and ignition
systems or improper of fuel in鄄
jection.
音 In case of engine stall, slight
knocking, knocking during op鄄
eration of difficult starting, have
the engine checked or repaired
by the JAC dealer, or it will ren鄄
der the engine unable to work
normally and will damage the
converter.
音 Avoid driving the vehicle with
low fuel or starting the engine
without gasoline. Otherwise the
engine cannot work normally
and the converter will be dam鄄
aged.
音 The idling time of the engine
must not exceed 10 min.
音 Do not try to start the engine
by pulling or pushing the vehi鄄
cle. This may overheat the con鄄
verter and result in burning.
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