To get drive rank settings use unit/get_drive_rank_settings:

svc=unit/get_drive_rank_settings&params={"itemId":<long>}

Returns the list of drive rank criteria and its parameters. IF criteria aren't defined then empty object returned {}.

{
    "acceleration":[...],
    "brake":[...],
    "global":{...},
    "turn":[...],
    "sensor":[...],
    "speeding":[...],
    "harsh":[...]
 }

All criteria and parameters are defined in update drive rank parameters.