Hi John, sprinkle Epsom salts in a line 10cms long about 5 cms out from the trunk, the potassium will help flowers set fruit. Worked brilliantly for me last year.
The problem isn't likely to be lack of pollinators as eggplants self-fertile and predominantly wind pollinated (although some cross pollination between plants can occur via insects, too).
Did flowers form and then drop? Temps that are too low can affect fruit set, as can temps that are too high (as with tomatoes and capsicums). The optimal temperature window is likely to vary a little depending on the variety.
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