Purpose, Function
The hydraulic variable valve timing actuator operates according to the hydraulic pressure and changes the phases of the exhaust camshaft. As a result, the open/close period of the exhaust valve is changed, optimized valve timing in accordance with driving conditions is realized, and the output and combustion efficiency is improved.
Construction
The hydraulic variable valve timing actuator is installed to the exhaust camshaft.
The hydraulic variable valve timing actuator has an assist spring to move the rotor in the advance direction while the engine is stopped.
Operation
At engine start
Because the stopper pin in the hydraulic variable valve timing actuator is engaged with the rotor at the maximum advance position by the spring force, the camshaft sprocket and camshaft are rotated as a single unit.
Retarding valve timing
Engine oil is lead to the retard oil passage by the OCV to apply oil pressure to the stopper pin and retard chamber. As a result, the engagement of the stopper pin is released, the rotor connected to the camshaft rotates in the retard direction against the camshaft sprocket driven by the crankshaft, and the valve timing is retarded.
Advancing valve timing
Engine oil is lead to the advance oil passage by the OCV to apply oil pressure to the advance chamber. As a result, the rotor connected to the camshaft rotates in the advance direction against the camshaft sprocket driven by the crankshaft, and the valve timing is advanced.
Maintaining intermediate valve timing
The retard and advance oil passages is closed by the OCV. As a result, the relative angle of the rotor and camshaft sprocket is maintained at a constant to hold the valve timing.
DRL (Daytime Running Light) System
Outline
The DRL system automatically switches the headlights to HI beams (50% dim)
or illuminates the DRL bulb when the ignition is switched ON (engine on), the
parking brake is released, and the shift lever is in a position other than P
(ATX).
The front body control module ( ...
Afs (Adaptive Front Lighting System)
Outline
The AFS is a system which enhances the range of visibility when the headlights
are turned on by pointing the optical axis of the headlights in the direction
in which the vehicle is advancing according to the steering operation.
Function
The AFS is controlled by the ...
Sas Control Module Removal/Installation [Standard Deployment Control System]
WARNING:
Handling the SAS control module or air bag module improperly can accidentally
deploy the air bag modules and pre-tensioner seat belts, which may seriously
injure you. Read the air bag system service warnings and cautions before handling
the air bag module..
If the c ...