Fakin' it (quick note)

( Previous part here )

As per original intent of this blog I'm just quickly adding this idea here.

Okay then. In earlier parts I mentioned changing duty cycle and problems it will cause. Now, if we take short enough buffer of pulses - let's say 3-7 full pulses - the figures become meaningful again. During normal driving the change of speed (ie. pulse duration/duty cycle) should not be that quick and the pulses should be fairly similar, so spurious (artificial) pulse should be fairly obvious.

Mind you, first spurious pulse should not be enough to raise a red flag - that could be caused by sudden braking or quick acceleration (or losing grip momentarily, like in winter). Variation in pulses when speed is relatively constant, now that might be an issue.

One red flag is too constant pulse though - if the speed remains same for entire drive, there absolutely is something wrong. Picking up customers, turns, traffic lights, stopping at destination - all that causes variation. And by entire drive I mean entire drive, not just long parts of it - driver may just be using cruise on empty main road.

And then there just could be speed indication on meter's display, along with the fare reading.