Honda Accord 2008 Manual page 357

07/11/02 09:00:45 61TA0000_110_0038
Fuel and Emissions Systems
System Description (cont'd)
VTC System
• The VTC system makes continuous intake valve timing changes based on operating conditions.
• Intake valve timing is optimized to allow the engine to produce maximum power.
• Cam angle is advanced to obtain the EGR effect and reduce pumping loss. The intake valve is closed quickly to
reduce the entry of the air/fuel mixture into the intake port and improve the charging effect.
• The system reduces the cam advance at idle, stabilizes combustion, and reduces engine speed.
• If a malfunction occurs, the VTC system control is disabled and the valve timing is fixed at the fully retarded position.
＊３０
MAXIMUM VTC ADVANCE 50 °
11-38
TDC
IN 2
EX
IN 1
MAXIMUM VTC ADVANCE 50 °
EX
IN 2
SHORT OVERLAP
LONG OVERLAP
IN 1