SsangYong Actyon Sports II. Manual — part 49

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2412-02

Differential pressure

sensor

Calculates the amount of

PM collected by reading the

pressure difference between

before and after the CDPF.

Engine ECU

DCM 3.7

Post-injection

Throttle

valve

Regulates the rate of air

intake.

CDPF

DOC+DPF

Front temperature

sensor

Protects the turbocharger.

Rear temperature sensor

Measures the temperature

of fuel combustion.

2. COMPONENT

For details, refer to section "Engine Control".

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3. INPUT/OUTPUT DEVICES

Front temperature sensor: This sensor is installed at the inlet of DOC and detects whether the

DOC can burn (oxidize) the post-injected fuel or not.

Rear temperature sensor: This sensor is installed at the inlet of DPF and monitors that the
temperature of the exhaust gas is kept at 600℃.

1.

2.

If the temperature exceeds 600℃, the life of CDPF can be reduced. So the amount of fuel

post-injection is decreased.
If the temperature drops under 600℃, the rate of regeneration can be decreased. So the

amount of fuel post-injection is increased.

-

-

Differential pressure sensor: This sensor checks the amount of PM collected by calculating the

pressure difference between before and after the CDPF.

Electric throttle valve: This valve reduces the intake air flow to raise the temperature of the exhaust

gas when the CDPF is operating during idling.

3.

4.

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2412-02

4. POST-INJECTION AND AIR MASS CONTROL

A DPS (Differential Pressure Sensor) measures the pressure difference between before and after the

CDPF and detects whether the soot is collected in the CDPF or not. If PM is collected in the CDPF (In

this case the pressure difference between before and after the CDPF exceeds the specified value.

Normally, the system sends the signal when the driving distance becomes approx. 600 to 1,200 km), the

temperature of exhaust gas is increased and the post-injection is started for regeneration. The amount of

fuel post-injection is controlled by the exhaust gas temperature measured by the rear temperature
sensor. If the temperature is less than 600℃, the amount of post-injection is increased to

increase the regeneration temperature. Otherwise, the fuel injection amount is decreased or the fuel is

not injected.

When the engine is running with low load, the intake air amount is also controlled as well as fuel injection

amount. This function is used to increaser the combustion temperature by increasing the amount of fuel

post-injection with the lowest air amount within the specified control logic.

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Front temperature sensor

Measures the temperature of

exhaust gas.

This sensor is located at the rear
side of exhaust manifold and
monitors the temperature of
combusted gas to prevent the
exhaust system from overheating.
When the temperature gets higher,
this sensor cuts off the fuel delivery
and controls the EGR to lower the
temperature.

Rear temperature sensor

Measure the outlet

temperature of DOC.

This sensor is located at the
rear side of DOC and
monitors the overheating of
CDPF and post injection
volume.

Engine ECU (D20DTR)

Differential pressure sensor

Measures the difference between

inlet and outlet pressures of CDPF.

If the difference is higher than the
specified value when collecting the
PM, this makes the post injection for
forced recycling of PM.

T-MAP sensor

Intake air

mass

Measures

the

excessive

amount of

PM.

Boost

pressure/

temperature

Injector (C31)

Controls the post injection.

Electric throttle body

Controls the intake air mass.

HFM sensor

Wide band

oxygen sensor