On 25/06/2018 15:05, NY wrote:
"Andy Burns" wrote in message
...
The TPMS operates over a longer period of time, probably minutes
rather than seconds, so over many revolutions of the wheel, likely the
numbers will get averaged out before it decides one wheel is turning
faster than the others enough to flag it up.

It *has* to integrate over a fairly long time and number of rotations to
avoid it being triggered every time the car turns a corner and the outer
wheel rotates faster than the inner wheel. I would imagine (and I've not
done the calculations) that the difference in rotational speed between
inner and outer wheel on a bend will be significantly more than the
difference in rotational speed between a correctly-inflated and an
under-inflated wheel, so any TPMS has to average out this large
difference in order to be able to detect a much smaller one.
Hmm. Wonder if drivers in Milton Keynes have problems with over-zealous
triggering of TPMS?