System Description

IVT CONTROL REFERENCE

Sensor

Input signal to ECM

ECM function

Actuator

Crankshaft position sensor (POS)
Camshaft position sensor (PHASE)

Engine speed and piston position

Intake valve timing control

Intake valve timing control solenoid valve

Engine coolant temperature sensor

Engine coolant temperature

Wheel sensor

Vehicle speed⁽¹⁾

⁽¹⁾	This signal is sent to the ECM through CAN communication line.

Fig 1: IVT Control System Operation Diagram

Courtesy of NISSAN MOTOR CO., U.S.A.

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