Audi V6 BITURBO Manual page 34

The control variable calculation is subdivided
into two paths
Prioritisation of
charging path
Path 1
The charging path regulates the control
variables which influence charging:
• Throttle valve angle
• Charge pressure
The air mass necessary to develop a specific
torque is determined by means of a
"calculation model" and is made available
along path 1 .
Path 2 is used to set the injection quantity or
cylinder cut-out necessary under the given
circumstances and the optimal ignition angle.
Prioritisation
of crankshaft-
synchronous
path
Path 2
All control actions which influence torque
regardless of charging are combined in the
crankshaft-synchronous path:
• Ignition angle
• Injection cut-out
• Injection time
By and large, long-term torque requests are
fulfilled along path 1 .
Path 2 is particularly well suited to meeting
short-term torque requests, which usually
have a torque-reducing effect.
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