Hyundai Genesis: Exhaust Emission Control System / CVVT (Continuously Variable Valve Timing) System Description and Operation
Hyundai Genesis (DH) 2013-2016 Service Manual / Emission Control System / Exhaust Emission Control System / CVVT (Continuously Variable Valve Timing) System Description and Operation
| Description |
Continuous Variable Valve Timing (CVVT) system advances or
retards the valve timing of the intake and exhaust valve in accordance
with the ECM control signal which is calculated by the engine speed and
load.
By controlling CVVT, the valve over-lap or under-lap occurs,
which makes better fuel economy and reduces exhaust gases (NOx, HC) and
improves engine performance through reduction of pumping loss, internal
EGR effect, improvement of combustion stability, improvement of
volumetric efficiency, and increase of expansion work.
This system consists of
| - |
the CVVT Oil Control Valve (OCV) which supplies the engine
oil to the cam phaser or takes out the engine oil from the cam phaser in
accordance with the ECM PWM (Pulse With Modulation) control signal, |
| - |
the CVVT Oil Temperature Sensor (OTS) which measures the engine oil temperature, |
| - |
and the Cam Phaser which changes the cam phase by using the hydraulic force of the engine oil. |
The engine oil which is supplied from the CVVT oil control
valve changes the cam phase in the direction (Intake Advance/Exhaust
Retard) or opposite direction (Intake Retard/Exhaust Advance) of the
engine rotation by rotating the rotor connected with the camshaft inside
the cam phaser.
| Operation Principle |
The CVVT has the mechanism rotating the rotor vane with
hydraulic force generated by the engine oil supplied to the advance or
retard chamber in accordance with the CVVT oil control valve control.
| [CVVT System Mode] |
| (1) Low Speed / Low Load | (2) Part Load |
|
|
| (3) Low Speed / High Load | (4) High Speed / High Load |
|
|
| Driving Condition | Exhaust Valve | Intake Valve | ||
| Valve Timing | Effect | Valve Timing | Effect | |
| (1) Low Speed /Low Load | Completely Advance | * Valve Under-lap * Improvement of combustion stability | Completely Retard | * Valve Under-lap * Improvement of combustion stability |
| (2) Part Load | Retard | * Increase of expansion work * Reduction of pumping loss * Reduction of HC | Retard | * Reduction of pumping loss |
| (3) Low Speed /High Load | Retard | * Increase of expansion work | Advance | * Prevention of intake back flow (Improvement of volumetric efficiency) |
| (4) High Speed /High Load | Advance | * Reduction of pumping loss | Retard | * Improvement of volumetric efficiency |
Catalytic Converter Repair procedures
Removal
(Refer to Engine Mechanical System - "Exhaust Manifold")
Installation
(Refer to Engine Mechanical System - "Exhaust Manifold") ...
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