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Set Fraction Out door air in AirLoopHVAC:OutdoorAirSystem by EMS Sensor and Actuator

Hi everyone,

I'm modeling an economizer system using AirLoopHVAC:OutdoorAirSystem for mixing air (return air from Thermal Zone and Outdoor air if the out door air condition is satisfied) using EMS to set the setpoint.

I wonder that if I want to use EMS to control the OA Fraction (or ratio between out door air and return air) of AirLoopHVAC:OutdoorAirSystem, which sensor and actuator (or component) should I set and control. This is my model (I controlled the relief air flow rate and supply air flow rate).

Thanks for all your relief and support for my question.