ENGINE - 2AZ-FXE ENGINE
02HEG07TE
02HEG04TE
02HEG05TE
02HEG06TE
02HEG04TE
02HEG04TE
TDC
EX
IN
BDC
Latest Timing
to Advance Side
IN
EX
IN
to Advance Side
EX
IN
to Retard Side
EX
IN
Latest Timing
EX
IN
Latest Timing
EX
EG-46
Effectiveness of the VVT-i System
Operation State
Objective
Effect
During
Idling
At Light
Load
Minimizing overlap to prevent
blow back to the intake side
Stabilized idling rpm
Better fuel economy
At Medium
Load
Increasing overlap to increase
internal EGR to reduce pumping
loss
Better fuel economy
Improved emission
control
In Low to
Medium Speed
Range with
Heavy Load
Advancing the intake valve
close timing for volumetric
efficiency improvement
Improved torque in low
to medium speed range
In High Speed
Range with
Heavy Load
Retarding the intake valve close
timing for volumetric efficiency
improvement
Improved output
At Low Temp.
Minimizing overlap to prevent
blow back to the intake side
Stabilized fast idle
rpm
Better fuel economy
Upon
Starting
Stopping
the Engine
Minimizing overlap to prevent
blow back to the intake side
Improved startability