Exhaust Valve Timing Control

SYSTEM

EXHAUST VALVE TIMING CONTROL : System Description


SYSTEM DIAGRAM







INPUT/OUTPUT SIGNAL CHART







SYSTEM DESCRIPTION






This mechanism hydraulically controls cam phases continuously with the fixed operating angle of the exhaust valve.
The ECM receives signals such as crankshaft position, camshaft position, engine speed, and engine oil temperature. Then, the ECM sends ON/OFF pulse duty signals to the exhaust valve timing (EVT) control solenoid valve depending on driving status. This makes it possible to control the shut/open timing of the exhaust valve to increase engine torque and output in a range of high engine speed.