SsangYong: Engine Euro 4. Service manual — part 29

CHANGED BY

EFFECTIVE DATE

AFFECTED VIN

3

2820

PRE - HEATING SYSTEM

D27DTP/D27DT (EU4) SM - 2006.08

D27DTP/D27DT (EU4)

ENGINE

FUEL

I

N

T

AKE

EXHAUST

PRE-HEA

TING

LUB

COOLING

SWITCHABLE

ECU

DIAGNOSIS

2. COMPARISON IN PREHEATING SYSTEM CIRCUIT

(D27DTP (POWER UP) ENGINE AND D27DT ENGINE)

As shown in the circuit below, the AQGS unit installed in D27DTP (POWER UP) engine communicate with other
units (cluster, immobilizer) via CAN.

D27DTP (POWER UP) Engine

D27DT Engine

Battery

Engine ECU

Glow plug

AQGS unit

Connector

Battery

Glow plug

Engine ECU

Preheating

control relay

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2820

PRE - HEATING SYSTEM

D27DTP/D27DT (EU4) SM - 2006.08

D27DTP/D27DT (EU4)

3. COMPONENTS OF PREHEATING SYSTEM

AQGS Unit for D27DTP (POWER UP) Engine

Preheating Control Relay for D27DT Engine

Battery main
terminal

K-Line (ECU 34)

IG1 Power terminal

Ground terminal

Glow plug control signal
(ECU113)

Connector for control

G5. (Glow plug No.5)

A. Power supply when key ON (IGN.1)

C. CAN-LO

D. Ground (-)

B. CAN-HI

G4. (Glow plug No.4)

G2. (Glow plug No.2)

Power (30B)

G3. (Glow plug No.3)

G1. (Glow plug No.1)

Connector for

power supply

AQGS Unit

Glow plug terminal (#1 ~ #5)

Preheat completion transfer terminal

CHANGED BY

EFFECTIVE DATE

AFFECTED VIN

5

2820

PRE - HEATING SYSTEM

D27DTP/D27DT (EU4) SM - 2006.08

D27DTP/D27DT (EU4)

ENGINE

FUEL

I

N

T

AKE

EXHAUST

PRE-HEA

TING

LUB

COOLING

SWITCHABLE

ECU

DIAGNOSIS

4. AQGS (ADVANCED QUICK GLOW SYSTEM) UNIT

The AQGS unit installed in D27DTP (POWER UP) engine can raise the the temperature of the glow plug up to 1,000°C
in 2 seconds.

AQGS Unit Control in Steps

This shows the voltage and time supplied by AQGS by
steps. As shown on the graph, the supplied voltage is
decreased as the steps are continued. The 3rd step is
to keep the temperature, not to raise it.

Voltage patterns by steps

Current (A)

Max. 183 sec.

Max. 183 sec.

Time (sec.)

• The voltage of battery

should be over 11.5 V.

NOTICE

• This step is completed

while the engine is
cranking.

NOTICE

• Temperature fixing

mode of glow plug: If
there is no engine
cranking signal after the
1st step is completed,
AQGS skips the 2nd
step and performs the
3rd step for approx.
28 seconds.

NOTICE

T

e

mperature (°C)

When the ignition key is turned
to ON position, the engine ECU
sends the preheat signal to
AQGS. Then, AQGS applies
the voltage (approx. 11 V) to the
glow plug for 2 seconds, and
then the glow plug’s tempera-
ture rises up to 1,000°C which
is the target temperature.
After 1st step, the preheat warn-
ing light (indicator) goes off.

1st step

When the engine cranking sig-
nal is received, AQGS applies
the voltage (approx. 6.5 V) to
the glow plug for 1 second, and
then the glow plug’s tempera-
ture increases up to 1,100°C
(target temperature).

2nd step

AQGS applies the voltage
(approx. 5.1 V) to the glow plug to
keep its temperature at 1,000°C.
This step can be operated for
up to 183 seconds depend-
ing on the conditions of en-
gine and glow plug.

3rd step

The post-heating is continued
for up to 183 seconds to raise
the temperature of the com-
bustion chamber and reduce
the amount the exhaust gas.
After 183 seconds, AQGS unit
cuts off the power supply to
the glow plug.

4th step

Pre-heating

Post-heating

PWM control

1 sec.

2 sec.

Max. 180 sec.

1st step

2nd step

3rd step

Actual

voltage

Seconds

CHANGED BY

EFFECTIVE DATE

AFFECTED VIN

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2820

PRE - HEATING SYSTEM

D27DTP/D27DT (EU4) SM - 2006.08

D27DTP/D27DT (EU4)

Characteristic Curve of Components of Preheating System

1. Normal operating mode

This shows the components of preheating system in the pre-heating and the post-heating steps.

Temperature of

glow plug

4th step

4th step

3rd step

2nd step

1st step

CAN signal from ECU

Engine cranking 1

Engine stopped 0

Preheat request

Post-heating timer

Post-heating

Post-heating

t3: approx. 180 sec.

ING ON

Engine running 2