Fuzzy Control Implement of Micro-flow Control System

In the real-time mixing pesticide of the Variable Rate Spay (VRS), In order to detect and control micro-flow of pesticide, a micro-flow control system and fuzzy control arithmetic were designed with Differential Pressure (DP) flow meter, Electrical Control Injector (ECI) and microprocessor. Using water as work fluid, at 20°C, the control system was tested. The testing results show that static errors is +5% at the range of 0~0.9 mL/s, the response time is 0.25 s, the steady errors is +2% at dynamic response test when initial value is O.1 mL/s and final value is 0.5 mL/s.