What is the channel number for Volkswagen intake pressure?

[DeTeagan]

There is no channel for Volkswagen intake pressure. It primarily relies on the engine speed signal sent by the crankshaft position sensor. When the engine speed reaches the set value, the engine control unit activates the solenoid valve circuit, opening the vacuum line and thereby opening the intake flap. The working principle is as follows: Intake valve opening: When air flows into the cylinder, due to inertia, even after the piston reaches the bottom dead center, air continues to flow into the cylinder. If the intake valve is closed when the cylinder pressure reaches its maximum, the volumetric efficiency will be maximized. This effect is known as the inertia effect. Cylinder pressure reaches maximum: To achieve the best volumetric efficiency, both the pulsation effect and the inertia effect must be considered. That is, when the cylinder pressure reaches its maximum and the intake valve is closed, the compression wave in the front intake manifold also reaches its highest position (peak).