2012 SSANGYONG RODIUS air condition

15-24
(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

15-270000-00
Load Engine speedSwirl
valveAmount of
swirlRemarks
Low speed,
Low loadbelow 3,000 rpm Closed HeavyIncreased EGR ratio, better air-fuel
mixture (reduce exhaust gas))
High speed,
High loadover 3,000 rpm Open LightIncrease charge efficiency, higher
engine power
The variable swirl valve actuator operates when
turning the ignition switch ON/OFF position to
open/close the swirl valve. In this period, the soot
will be removed and the learning for swirl valve
position is performed.
Swirl: This is the twisted (radial) air flow along the cylinder wall during the intake stroke. This
stabilizes the combustion even in lean air-fuel mixture condition.
Swirl valve
E. Features
Swirl and air intake efficiency
To generate the swirl, the intake port should be serpentine design. This makes the resistance in air
flow. The resistance in air flow in engine high speed decreases the intake efficiency. Eventually, the
engine power is also decreased, Thus, the swirl operation is deactivated in high speed range to
increase the intake efficiency.
Relationship between swirl and EGR
To reduce Nox, it is essential to increase EGR ratio. However, if EGR ratio is too high, the PM also
could be very higher. And, the exhaust gas should be evenly mixed with newly aspired air. Otherwise,
PM and CO are dramatically increased in highly concentrated exhaust gas range and EGR ratio
could not be increased beyond a certain limit. If the swirl valve operates in this moment, the limit of
EGR ratio will be higher. -
-
F. Relationship between swirl and fuel injection pressur
The injector for DI engine uses the multi hole design. For this vehicle, there are 8 holes in injector. If the
swirl is too strong, the injection angles might be overlapped and may cause the increased PM and
insufficient engine power. Also, if the injection pressure is too high during strong swirl, the injection
angles might be overlapped. Therefore, the system may decreases the fuel injection pressure when the
swirl is too strong.

15-38
Relay box
A/C
compressorHFM (intake air
temperature)Cooling fan
module
MB 5 A/T (ATF
temperature)Coolant
temperature
sensor
(12) Cooling fan control
A. Overview of cooling fan and A/C compressor
The cooling system maintains the engine temperature at an efficient level during all engine operating
conditions. The water pump draws the coolant from the radiator. The coolant then circulates through
water jackets in the engine block, the intake manifold, and the cylinder head. When the coolant reaches
the operating temperature of the thermostat, the thermostat opens. The coolant then goes back to the
radiator where it cools. The heat from automatic transmission is also cooled down through the radiator
by circulating the oil through the oil pump. ECU controls the electric cooling fans with three cooling fan
relays to improve the engine torque and air conditioning performance.
For detailed information, refer to Chapter "Air Conditioning System".
B. Components
D20DTR ECU
Refrigerant

15-430000-00
C. PTC operation process
The PTC operating condition (ON) is controlled in two steps.
Basically, the engine ECU controls the relay to supply the power to PTC according to the coolant
temperature sensor and ambient temperature sensor.
1st step (initial operation of PTC) ▶
Coolant temperature < 15°C: PTC ON
<006a00960096009300880095009b0047009b008c00940097008c00990088009b009c0099008c004702fb00470058005c00b6006a006100470077007b006a00470076007500470088008d009b008c00990047009a0088009b0090009a008d00a00090009500
8e0047009b008f008c0047008a00960095008b0090009b0090>ons in 2nd step -
-
2nd step (coolant temperature ≥ 15°C) ▶
<006a00960096009300880095009b0047009b008c00940097008c00990088009b009c0099008c004702fa0047005d005c00b6006a004700880095008b004700900095009b00880092008c00470088009000990047009b008c00940097008c00990088009b00
9c0099008c004702fa004700540058005700b6006a00610047>PTC ON
<006a00960096009300880095009b0047009b008c00940097008c00990088009b009c0099008c004700630047005d005700a5005d005c00b6006a004700880095008b004700900095009b00880092008c00470088009000990047009b008c00940097008c00
990088009b009c0099008c00470063004700540058005700a5>0°C: PTC ON
<006a00960096009300880095009b0047009b008c00940097008c00990088009b009c0099008c004702fa0047005d005700b6006a004700880095008b004700900095009b00880092008c00470088009000990047009b008c00940097008c00990088009b00
9c0099008c004702fa0047005700a5005c00b6006a00610047>PTC ON -
-
-
Stop (OFF) conditions ▶
A/C blower switch OFF
Defective ambient air temperature sensor (including open or short circuit)
Engine cranking
Low battery voltage (below 11V)
During pre-glow process (glow indicator ON) -
-
-
-
-

09-58790-01
2. CAUTIONS
The parking aid system is just a supplemental device to help your parking.
Always keep the safety precautions.
Do not press or shock the sensors by hitting or using a high-pressure water gun while
washing, since it may damage the sensors.
If the system is in normal operating condition, a short beep sounds when the shift lever is
moved into "R" position with the ignition key "ON".
If the system is defective, the warning buzzer sounds for 3 seconds when moving the gear
<009a008f0090008d009b00470093008c009d008c00990047009b0096004702c8007902c9004700970096009a0090009b0090009600950047009e0090009b008f0047009b008f008c00470090008e00950090009b0090009600950047007600750055004700
69008c0047008a00880099008c008d009c0093004700950096>t to confuse this and the parking
aid alarm (in 50 cm). 1.
2.
3.
4.
5.
· Note that the display does not show everything in the rear area. Always check
nobody, especially animals and children, is behind the vehicle when parking or
reversing.
· If you can not properly check the vehicle behind, get out of the vehicle and then
visually check it.
The parking aid system will not work or improperly work under following cases: ▶
1) Certain obstacles that sensors can not detect
Thin and narrow objects, such as wires, ropes, chains
Cotton, sponge, clothes, snow; that absorb ultrasonic waves
Obstacles lower than the bumper (ex. drain ditch or mud puddle) -
-
-
2) Not defective but improperly working
When the sensing portion is frozen (operates normally after thawed)
When the sensing portion is covered by rain, water drops, snow or mud (operates normally
after cleaned)
When receiving other ultrasonic signals (metal sound or air braking noises from heavy
commercial vehicles)
When a high-power radio is turned on -
-
-
-
3) Narrowed sensing area
When the sensing portion is partially covered by snow or mud (operates normally after cleaned)
<007a009c009900990096009c0095008b00900095008e0047009b008c00940097008c00990088009b009c0099008c00470096008d0047009a008c0095009a0096009900470090009a0047009b009600960047008f0090008e008f0047004f00880097009700
990096009f005500470096009d008c00990047005f005700b6>C) or too low
(approx. below -30°C) -
-
4) Not defective but may cause malfunction
When driving on the rough roads, gravel road, hill and grass
When the bumper height is changed due to heavy load
When the sensing portion is frozen
When the sensing portion is covered by rain, water drops, snow or mud
When receiving other ultrasonic signals (metal sound or air braking noises from heavy
commercial vehicles)
When a high-power radio is turned on
When some accessories are attached in detecting ranges -
-
-
-
-
-
-

10-74891-01
2) EBD (Electronic Brake Force Distribution) System
▶System description
As an add-on logic to the ABS base algorithm, EBD works in a range in which the intervention
thresholds for ABS control are not reached yet.
EBD ensures that the rear wheels are sensitively monitored for slip with respect to the front axle. If slip is
detected, the inlet valves for the rear wheels are switched to pressure hold to prevent a further increase
in pressure at the rear-wheel breaks, thus electronically reproducing
a pressure-reduction function at the rear-wheel brakes.
ABS features an enhanced algorithm which includes control of the brake force distribution between the
front and rear axles. This is called Electronic Brake Distribution. In an unloading car condition the brake
efficiency is comparable to the conventional system but for a fully loaded vehicle the efficiency of the
EBD system is higher due to the better use of rear axle braking capability.
▶Advantages
Elimination of conventional proportioning valve EBD utilizes the existing rear axle wheel speed
sensor to monitor rear wheel slip.
Based on many variables in algorithm a pressure hold, increase and/or decrease pulsetrain may be
triggered at the rear wheels insuring vehicle stability.
Vehicle approaches the ideal brake force distribution (front to rear).
Constant brake force distribution during vehicle lifetime.
EBD function is monitored via ABS safety logic (conventional proportioning valves are not
monitorable). ·
·
·
·
·
3) Important Notice
The modulators for production line are not filled with the brake fluid (dry type). But, for after service, they
are filled with the brake fluid (wet type).
Make sure to keep the procedures in service manual when bleeding the air from the brake lines.
Be familiar with the lamp ON conditions to provide the correct information and reliability to customers.
ECU monitors the valve and motor for ABS when the vehicle speed approaches 5 km/h. At this time, you
can hear the clattering noise. 1.
2.
3.

01-2
Front air conditioner module assembly - inside instrument panel
Compressor - engine rightAQS/Air source selection
switch
Sun load sensor - instrument
panel upper left
1. SYSTEM LAYOUT AND COMPONENTS
Type Air cindotioner controller
FATC
Manual air
conditioner
It change sun load coming through
front windshield into current to input to
FATC controller. *
Air mix door
actuator
PTC (If equipped)
Duct temperature
sensor
Mode door
actuator
Air conditioner wiring
Thermo AMP
Air source door
actuator
Air conditioner
filter
Bloewr motor
Blower high speed relayPower transistor

01-36810-30
Rear air conditioner module assembly - bottom of rear left
Engine ECU - passenger's
footstep
CondenserRecevier driver-condenser
right
Rear fan speed dial
Sub-condenser - right wheel
front
Absorbs moisture in the
refrigerant and reserves
refrigerant to supply
smoothly. *Instslled in front of vehicle and
condenses vapor refrigerant into
low temperature and high
pressure liquid refrigerant *
Condenses high temperature and
high pressure vapor refrigerant into
low-temperature-high-pressure
liquid refrigerant. *
Detects A/C AUTO switch position,
coolant temperature, engine
condition and driving condition to
control the air conditioner *
A sensor that detects coolant
temperature and transmits to
engine ECU *
Blower motor
Power transistor
Air conditoner high
pressure/low
pressure pipe
Air mix door
actuator
Front
Rear
A switch that controls the rear air
conditioner module. *
Collant temperature sensor -
on engine