MIVEC (Mitsubishi Innovative Valve Timing Electronic Control System)

The MIVEC system effects a continuously variable control on the inlet valve timing. The valve operating angle is not change. MIVEC enables valve timing control that is optimal for the operating conditions of the engine. Thus, it stabilizes the idle and improves power output and torque in all driving ranges.
System Configuration Diagram

  • The engine-ECU assesses the driving conditions of the engine by way of the signals input by sensors.
  • Based on the assessed information, the engine-ECU outputs duty cycle signals to the inlet oil feeder control valve in order to control the position of the spool valve.
  • By varying the position of the spool valve, the oil pressure can be applied either to the retard or advance chamber, thus continuously changing the phases of the inlet camshaft.

The engine-ECU calculates the detected phase angle by using the signal from the inlet camshaft position sensor and the crank angle sensor.
Operation Conceptual Diagram

The engine-ECU controls the camshaft phase angle in order to attain optimal valve timing that suits the engine load and engine speed.

Initial Phase
Control Direction
Inlet valve
Most retarded angle
Advance direction