2013 SSANGYONG NEW ACTYON SPORTS engine diesel

10-4
Glow plug control unit
(GCU)
1. OVERVIEW
The pre-heating system for D20DTR engine has the glow plug to the cylinder head (combustion
chamber), and improves the cold start performance and reduces the emission level.
The pre-heating resistor (air heater) is used to heat the intake air.
This enables the diesel fuel to be ignited in low temperature condition.
The ECU receives the information such as, engine rpm, coolant temperature, engine torque, etc.,
through CAN communication during pre-heating process; and the pre-heating control unit controls the
pre-heating, heating during cranking and post-heating by the PWM control.
Glow plug
Glow indicatorEngine ECU (D20DTR)

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1. OVERVIEW
The low emission vehicle is being sold increasingly in the market as a countermeasure for complying
with the environment regulations such as a special act on Seoul metropolitan air quality improvement
and for reducing the PM (Particulate Material) from the diesel-powered vehicle. For the CDPF system,
the DOC (two-way catalytic converter or catalytic combustion system) fitted to the conventional diesel
engine has the high purification rate for HC or CO but not have a high reduction rate for the PM. For this
reason, a necessity has been raised in order to consider a countermeasure to reduce the PM since the
existing DOC can't meet the regulation, which is getting tighter.
This results in a development of the CDPF (Catalyst & Diesel Particulate Filter) that is combination of the
existing DOC (Diesel Oxydation Catalyst) and DPF (Diesel Particulate Filter). While the DOC converts
the CO and HC into the CO2 and H2O - unharmful to human body - using a oxidation reaction, the DPF
collects the PF (Particulate Material) for regeneration of it. However, each of these devices can only
reduce a part of the exhaust gas. This evoked the necessity of the CDPF with both features. The DOC
capacity is more on the manual transmission than the automatic transmission.
DPF(Diesel Particulate Filter) ▶DOC(Diesel Oxidation Catalyst) ▶
It is called as a oxidation catalyst, which purifies CO and HC in exhaust gas. The three-way catalyst is
used for the gasoline vehicle. But, the diesel engine oxidates CO and HC excepting NOx into H2O and
CO2 in order to purify the exhaust gas since the exhaust gas has a rich oxygen at all times.
It consists of mainly the aluminum and titanium and there is a porous thin film, which emits the exhaust
gas but does not emit the PM in it. It emits the exhaust gas generated during combustion and filters the
PM which is a byproduct of combustion to burn it when a certain amount of it is collected in the filter.
When a certain amount of the PM builds up, exposure to high exhaust gas causes carbon, the
fundamental ingredient in PM, to burn and release into the atmosphere in form of CO2.

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(8) Swirl control
A. Overview
Variable swirl valve ▶
The strong swirl caused by intake air is important element for anti-locking function in diesel engine. The
swirl control valve partially closes the intake port to generate the swirl according to the engine conditions.
When the engine load is in low or medium range, the swirl could not be generated because the air flow is
slow. To generate strong swirl, there are two passages in intake manifold, and one of them has the valve
to open and close the passage. When the valve closes the passage, the air flow through the another
passage will be faster, and the strong swirl will be generated by the internal structure of the passage. This
swirl makes the better mixture of air and fuel, eventually the combustion efficiency in combustion
chamber could be improved. This provides the enhanced fuel consumption, power and EGR ratio.
Components ▶
HFMCrankshaft position sensorVariable swirl valve
Coolant temperature
sensorAccekerator pedal
moduleD20DTR ECU

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C. Types of swirl
Swirl: One cylinder has two intake air ports, one is set horizontally and
the other one is set vertically. Swirl is the horizontal air flows in cylinder
due to the horizontal intake air ports.
Tumble: Tumble is the vertical air flows in cylinder due to the vertical
intake air port
Tumble: Tumble is the vertical air flows in cylinder due to the vertical
intake air port
D. Swirl control
In DI type diesel engine, the liquefied fuel is injected into the cylinder directly. If the fuel is evenly
distributed in short period, the combustion efficiency could be improved. To get this, there should be
good air flow in cylinder. In general, there are two intake ports, swirl port and tangential port, in each
cylinder. The swirl port generates the horizontal flow and the tangential port generates the longitudinal
flow. In low/mid load range, the tabgential port is closed to increase the horizontal flow. Fast flow
decreases the PM during combustion and increases the EGR ratio by better combustion efficiency.

15-36
HFM (intake air
temperature)CDPF
Electric throttle
bodyCoolant
temperature
sensorOxygen sensor
Injector (C3I)
E-EGR valve
(11) Wide band oxygen sensor control
A. Overview
For diesel engine, combustion is not performed at the optimum (theoretically correct) air-fuel ratio and
the oxygen concentration is thin in most cases. So the wide-band oxygen sensor is used for this kind of
engine, and this sensor is a little different from the one that used for gasoline engine. The combustion in
diesel engine is controlled by fuel injection volume. Therefore, the wide band oxygen sensor should be
used in diesel engine. This sensor measures the air-fuel ratio in very wide range, and is also called full
range oxygen sensor.
The wide band oxygen sensor measures the oxygen density in exhaust gas and sends it to ECU to
control the EGR more precisely. -
B. Components
D20DTR ECU

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(15) CDPF control
A. Overview
As the solution for environmental regulations and PM Particle Material) of diesel engine, the low emission
vehicle is getting popular. This vehicle is equipped with an extra filter to collect the soot and burn it again
so that the amount of PM in the exhaust gas passed through the DOC (Diesel Oxidation Catalyst) is
reduced. The CDPF (Catalyst & Diesel Particulate Filter) is an integrated filter including DOC (Diesel
Oxidation Catalyst) and DPF (Diesel Particulate Filter).
For details, refer to Chapter "CDPF".
B. Components
Oxygen
sensorFront
EGT sensorCDPF
(DOC + DPF)Rear
EGT sensor
Differential pressure
sensorD20DTR ECUElectric throttle body

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7) Battery Voltage Correction Mode
When battery voltage is low, the ECM can compensate for a weak spark delivered by the ignition
module by using the following methods:
Increasing the fuel injector pulse width.
Increasing the idle speed rpm.
Increasing the ignition dwell time. -
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8) Fuel Cut-Off Mode
No fuel is delivered by the fuel injectors when the ignition is off. This prevents dieseling or engine runon.
Also, the fuel is not delivered if there are no reference pulses received from the CKP sensor. This
prevents flooding.

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Method for Reduction of NOx ▶
NOx is generated a great deal in case that combustion temperature and excess air factor are high. EGR
valve can decrease NOx (30 to 35% decrease) by making temperature of combustion chamber fall by
means of exhaust gas re-circulation.
EGR valve is installed on the diesel engine of Musso, Korando, Istana and Rexton.
And micro switch is installed together to control EGR valve.
The setting method of micro switch is identical with the existing one. -
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