Overview of a boost control system
Boost control actuators have three ports that are connected to
Atmospheric pressure, R (Return). This port is closed whenever the
valve is inactive. When the valve is activated, this port is opened
Pressure after the compressor, C (Compressor). The C-port is
always connected to port W. Generally, the C-port has a visible
restriction
The turbo’s wastegate actuator, W (Wastegate Clock). This port is
always connected to port C
Boost control valves have three port and two or three connection pins
NIRA i7x controls the boost pressure actuator by giving the valve a PWM-
signal. A pressure drop that depends on the PWM-signal is created over the
R-port and thus the pressure that reaches the waste gate actuator is
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