System Description: Description

WARNING: This page is about a different car, the 2018 Infiniti Q60. However, it is still accessible from the selected car via links, so may be relevant.

With the camshaft adjustment function, intake camshaft is adjusted up to crank angle 40 deg. in advance direction, and exhaust camshaft is adjusted up to crank angle 40 deg. in retard direction. This enables the achievement of optimum valve overlap according to engine load. Furthermore, engine performance curves are optimized, fuel economy is improved, and toxic exhaust gas is reduced.

ECM controls camshaft adjustment according to the following sensors and signals.

Intake camshaft position sensor
Exhaust camshaft position sensor
Engine coolant temperature sensor
Pressure sensor downstream of throttle valve (Engine load)
Crankshaft position sensor (Engine speeds)

ECM adjusts camshaft position by controlling intake camshaft actuator and exhaust camshaft actuator according to a PWM signal. ECM continuously adjusts the duty ratio of signal according to the characteristics map consistent with engine load. The control piston of camshaft actuator moves as the magnetic force increases. This allows engine oil to flow into the control plunger. Accordingly, the control plunger moves rearward (axial direction) and rotates each camshaft in the camshaft rotation direction via helical gear. The camshaft position is detected by the intake camshaft position sensor and the exhaust camshaft position sensor and transmitted to ECM as a voltage signal.