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controlled. NIRA i7x can be configured to use either a PWM output or an H-
bridge output to control the boost pressure actuator. This configuration is
done using NIRA rk.
Bypass flow through the Boost Pressure
Actuator dependent on the PWM through the actuator coil
Boost control valves either have two or three connection pins. The type of
waste gate used and the type of boost control valve determines how the
valve should be connected.
3.16.1 Boost Control Valve with Two Connection Pins
Connection of the sourcing and ground cables is arbitrary on two pin valves.
If the waste gate clock gives a higher boost pressure when the W-port has a
lower pressure, the cables can be connected according to the table below.
The table below assumes that the boost control valve is made for 12 V
sourcing.
3.17 IAC (Idle Air Control)
At idle, the throttle butterfly is closed. In order to keep the engine from
stalling, a small amount of intake air must be allowed to bypass the throttle
butterfly. Stable idle speed is achieved by controlling the amount of bypass
air and altering the ignition.
There are several different configurations for controlling the bypass air.
Typically some sort of IAC valve or IAC motor is used. NIRA i7x can control
the IAC valve/motor using an H-bridge.
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