Hyundai Sonata: Exhaust Emission Control System / CVVT (Continuously Variable Valve Timing) System Description and Operation
Hyundai Sonata LF 2014-2019 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 consist of
| - |
the CVVT Oil Control Valve (OCV) which rgulates engine oil to
and from the cam phaser in accordance with the ECM PWM (Pulse With
Modulation) control signal, |
| - |
and the Cam Phaser which varies the cam phase by using the hydraulic force of the engine oil. |
The engine oil getting out of the CVVT oil control valve
varies 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
1.
Remove the exhaust manifold.
(Refer to Engine Mechanical System - "Exhaust Manifold")
Installation
1.
Install in the reverse order of removal. ...
Other information:
Hyundai Sonata LF 2014-2019 Service Manual: Oil Pump Components and Components Location
Components
1. Timing chain cover2. Inner rotor3. Outer rotor4. Pump cover
...
Hyundai Sonata LF 2014-2019 Owners Manual: How to deactivate the Smart Trunk function using the smart key
1. Door lock
2. Door unlock
3. Trunk open
4. Panic
If you press any button of the smart key during the Detect and Alert stage, the
Smart Trunk function will be deactivated.
Make sure to be aware of how to deactivate the Smart Trunk function for emergency
situations.
Information
If you press the ...
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