Fuel and Emissions System Description - VTEC/VTC



Driving Condition VTC Control Description 
(1) Light-load Base Position For stable combustion the cam angle is retarded, and reduces the entry of exhaust gas into the cylinder.  
(2) Medium/high-load Advance Control Cam phase angle is controlled to optimize valve timing, improving fuel efficiency and reducing emissions. 
(3) High speed Advance-Base Position To reduce the pumping loss, the intake valve is closed quickly. This helps the entry of fuel air mixture by the charging effect, and maximizes engine power. 

VTC System


VTEC System



System Diagram 

Camshaft Position (CMP) Sensor A

CMP sensor A detects camshaft angle position for the VTC system.