Figure 3.55. The pneumatic actuator A of the boost pressure control valve is controlled by the electromagnetic valve B, which, in turn, is controlled by the engine control unit.
In the initial position, the boost pressure control valve is open. In this case, the engine operates without turbocharging.
The electromagnetic valve is closed in its initial position, and control voltage is supplied to it when the engine is started with some time delay depending on the coolant temperature (figure 3.56).
Figure 3.56. Dependence of time delay on coolant temperature: X - Time delay, s; Y - Temperature,°C.
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