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This looks like a more advanced ,electronically controlled bypass value found on gas turbo cars .
The idea here is at low loads bypass intercooler and/or turbo so turbo response is better at low throttle conditions, it also helps in boost conditions by bypassing the butterfly (reducing pressure build up at throttle are rerouting to intake of turbo .
The difference here with TDI is there no routing the bypass to turbo and able to control more volume than types used in gas .
My guess is at low loads they bypass intercooler trying to keep temps high, then under boost phase in the intercooler to lower temps .
With gas turbos the intakes go to like 250F and then intercoolers bring it down to the 130F range (of course this depends on boost amount and intercooler size (there generally around 70% efficiency ))
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