When the accelerator is released

When the throttle disc closes, a vacuum is quickly built up in the intake manifold by the combustion while the pressure before the throttle disc still remains. To avoid pressure shock in the intake manifold when the throttle disc again opens, the pressure before the throttle disc must be released. The bypass valve signal line, which is connected to the outlet before the throttle disc during normal conditions, is then connected to the outlet after the throttle disc through a solenoid valve controlled by Trionic.".

Through the vacuum in the intake manifold, a vacuum on the spring side of the bypass valve is also achieved. This vacuum makes the valve open and release the pressure from the compressor housing and intake system into the intake hose. This connection is active until the pressure before the throttle disc has again stabilized. Subsequently, the connection between the signal line and the outlet before the throttle disc will be restored.