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Cyclone separators do work but less well in a moving environment as the movement upsets the flow path of the particulates being sorted.
In a previous life I was working in the mining industry (tin mining and extraction) and we had cyclones damn near every where in the production stream and one attempt was made to add them to shaker tables as a secondary step.
The shaker tables worked well and the cyclones worked well so long as both operated independently.
Bolt a cyclone to anything which moves and all you get is a mess.
At the moment as mentioned above DPF is the most viable way to achieve the required result and YES car makers know about cyclone filtration / separation too.
Peter.
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