2-1-5-3-osnovnye-osobennosti-vozdukhovoda-s-peremennymi-kharakteristikami-vad-l3.html
The control system of VAD opens a zaslonka in the case of the air filter at high frequencies of rotation of the engine for increase in an air stream. The system consists of a zaslonka, the electromagnetic valve of management, the vacuum chamber and the return valve. Usually, the core under the influence of a spring opens a zaslonka
(fig. 2.57).