The Variable Valve Timing that most of us see in our shops is actually variable “camshaft” timing. This improves low and high speed torque by advancing or retarding the camshaft timing.
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In contrast, some double-overhead camshaft (DOHC) applications perform those same functions by separately advancing or retarding the intake and exhaust camshafts.
VVT systems use all sorts of sensors, but the most important are the camshaft and crankshaft position sensors. The ECU uses these sensors to monitor the relationship between the piston’s location and the valves’ positions. The crankshaft is connected to the rod and piston, and the camshaft lobes trigger valve lift events. So, The crankshaft and camshaft position sensors provide the information to the ECU. As a result, It can learn how fast the engine is rotating and the relative positions of the pistons and valves.