2.1.5.3. The main features of an air duct with variable characteristics (VAD) (L3)

Fig. 2.57. The VAD system of the Mazda 3 car with the L3 engine: 1 – VAD system gate; 2 – the operating electromagnetic valve of the VAD system; 3 – vacuum chamber of the VAD system; 4 – backpressure valve of the VAD system

The control system of VAD opens the gate in the case of the air filter with high frequencies of rotation of the engine for increase in an air stream. The system consists of the gate, the electromagnetic valve of management, the vacuum chamber and the backpressure valve. Usually, the core under the influence of a spring opens the gate (fig. 2.57).