System Description
SYSTEM DIAGRAM
SYSTEM DESCRIPTION
This engine uses an electric VTC. The electric VTC responds faster than hydraulic VTC and allows operating under low engine speed condition. This improves the fuel economy, engine output, and exhaust performance. This mechanism continuously controls the phase of camshaft by the electric intake valve timing (IVT) control actuator with the amount of intake valve operation held constant. ECM transmits a crankshaft position signal and an intake camshaft position signal to the electric IVT control module and transmits target values of electric IVT control actuator via engine communication (CAN). The electric IVT control module controls the electric IVT control actuator according to a signal from ECM and changes the opening and closing timing of intake valve. Furthermore, the electric IVT control actuator has a diagnostic function and transmits a DTC detection signal to ECM via engine communication when detecting a system error.
| Status of electric intake valve timing control actuator | Electric intake valve timing control actuator activation |
|---|---|
| Advanced angle | Electric IVT control motor rotates faster than camshaft. This allows the camshaft position (cam phase) against camshaft sprocket to move toward the advanced angle. |
| Maintained | Electric IVT control motor and camshaft rotate at the same speed. |
| Retard angle | Electric IVT control motor rotates slower than camshaft. This allows the camshaft position (cam phase) against camshaft sprocket to move toward the retard angle. |