Mightymouse is right, it's a traditional type of alternator with the voltage regulation done by the TIPM. The TIPM has some sort of feedback from the battery, presumably temperature. I have potentiometers on my dash and voltage seems to be highest on a hot day, but there is not really any logical trend that I've noticed to be honest. Voltage seems to bounce between 14.5 and 15.3 (2009 CRD) most of the time at the higher end (that's what kills batteries).
The system is perfectly suitable for a VSR dual bat system if that's what you're getting at.
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