Self-Study Program

26
Control units
Close attention is normally given to two operating points. This is firstly the point at 1800 rpm (equivalent to
idling speed, green marks) and, secondly, the setpoint at 6000 rpm (red mark).
In the case of an 140 A alternator, for example, this value always refers to the setpoint at 6000 rpm. Some
nameplates display values such as 75-140 A. The first value denotes the maximum possible current output at
1800 rpm, i.e. 75 A, and the second value corresponds to the setpoint (140 A at 6000 rpm).
Notes
- The characteristic data always refers to
operation at room temperature.
- In this context, "speed" means
alternator speed, and not the engine
speed.
The following alternators are used in the Audi Q7:
Manufacturer Alternator data Alternator type I_max @ 1800 rpm I_max @ 6000 rpm
Valeo 100-150 A TG16 100A 150A
Valeo 105-180 A TG17 105A 180A
Hitachi 140-210 A HTC 190A 140A 210A