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