Hyundai Santa Fe (2006 year). Manual — part 280
EXHAUST EMISSION CONTROL SYSTEM
EC -17
CONTINUOUS VARIABLE VALVE
TIMING (CVVT)
DESCRIPTION
ECBE8ABD
CMPS
Intake
Camshaft
PCM
CVVT
Retard
Chamber
CVVT
Advance
Chamber
RETARD
ADVANCE
Housing
Vane
Vane
CVVT Housing
OCV
DRAIN
DRAIN
From
Oil Pump
VARIOUS
SENSOR
After Main Relay
After Main Relay
UEBG013A
The CVVT (Continuously Variable Valve Timing) which is
installed on the exhaust camshaft controls intake valve
open and close timing in order to improve engine perfor-
mance.
The intake valve timing is optimized by CVVT system de-
pending on engine rpm.
This CVVT system improves fuel efficiency and reduces
NOx emissions at all levels of engine speed, vehicle
speed, and engine load by EGR effect because of valve
over-lap optimization.
The CVVT changes the phase of the intake camshaft via
oil pressure.
It changes the intake valve timing continuously.
Driving Condition Intake Valve Timing
Effect
Enhanced torque
Enhanced Power
High load&
Low rpm (3)
High load&
High rpm (4)
Advance
Retard
Enhanced fuel economy and
exhaust emissions
Part load (2)
Advance
Light load (1)
Retard
Stable combustion
1
3
4
2
RETARD
ADVANCE
ENGINE SPEED (RPM)
LOAD
Low
High
High
LEIF001Q
OPERATION
EA7ECAF2
The CVVT system makes continuous intake valve timing
changes based on operating conditions.
Intake valve timing is optimized to allow the engine to pro-
duce maximum power.
Cam angle is advanced to obtain the EGR effect and re-
duce pumping loss. The intake valve is closed quickly to
EC -18
EMISSIONS CONTROL SYSTEM
reduce the entry of the air/fuel mixture into the intake port
and improve the changing effect.
Reduces the cam advance at idle, stabilizes combustion,
and reduces engine speed.
If a malfunction occurs, the CVVT system control is dis-
abled and the valve timing is fixed at the fully retarded po-
sition.
TDC
IN 2
IN 1
EX
IN 2
IN 1
EX
SHORT OVERLAP
LONG OVERLAP
RETARD
P
P
P
HOLD
ADVANCE
Rotor
Vane
Housing
Vane
Retard
Chamber
Retard
Chamber
Retard
Chamber
UEBG014A
1.
The above figure shows the relative operation struc-
tures of the housing vane to the rotor vane.
2.
If the CVVT is held a certain control angle, to hold this
state, oil is replenished as much as oil leaks from the
oil pump.
The OCV (Oil-flow Control Valve) spool location at this time
is as follows.
Oil pump → Advance oil chamber (Little by little open
the inflow side to the advance oil chamber) → Almost
close the drain side
Be sure there might be a difference in the position accord-
ing to the engine running state (rpm, oil temperature, and
oil pressure).
Engine Electrical
System
GENERAL
CHARGING SYSTEM
ALTERNATOR
BATTERY
STARTING SYSTEM
STATER
STARTER RELAY
PREHEATING SYSTEM
EE -2
ENGINE ELECTRICAL SYSTEM
GENERAL
SPECIFICATION
EEC7BAAD
STARTING SYSTEM
Item
Specifications
Type
Reduction drive (with planetary gear)
Rated voltage
12V, 2.0KW
No. of pinion teeth
9
Voltage
11.5V
Amperage
120A, MAX
Starter
No-load charasteristics
Speed
4,000rpm, MIN
CHARGING SYSTEM
Item
Specifications
Type
Battery voltage sensing
Rated voltage
12V, 120A
Voltage regulator
I.C regulator built-in type
Regulator setting voltage
14.4 ± 0.3V
Alternator
Temperrature compensation
-10 ± 3mV/ C
Type
CMF 90L
Cold cranking amperage at-18 C (0 F)
720A
Reserve capacity
160min
Battery
Specific gravity at 20 C (77 F)
1.280 ± 0.01
NOTE
-
COLD CRANKING AMPERAGE is the amperage
a battery can deliver for 30 seconds and maintain
a terminal voltage of 7.2V or greater at a specified
temperature.
-
REVERSE CAPACITY RATING is amount of time
a battery can deliver 25A and maintain a mini-
mum terminal voltage of 10.5V at 26.7 C(80 F)
PREHEATING SYSTEM
Item
Specifications
Rated voltage
DC 11V
Glow plug
Current
16A ± 1.5A after 4 seconds loading
at rated voltage
Rated voltage
DC 12V
Operating voltage range
DC 9V ~ DC 16V
Operating temperature range
-40 C ~ 120 C
Glow plug relay
Rated load current
DC 12V, 70A
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