Originally Posted by Karl Buchka
I'm surprised the AMM is that fast.
Surprised that it is possible, or surprised that Volvo bother?
Hot wire anemometry is commonly used to measure turbulance in airflow. The sensors are usually a lot smaller (i.e. lower thermal mass) than those used in our Volvo AMM, but I see no reason why they would not be able to measure these very slight variations in airflow. What surprises me is that the measurement need be that precise, especially as it is then probably averaged out in the ECU.