The variable rate applications with direct injection systems is an important tool in precision agriculture to prevent from weed infestation. The injection system technology allow multiple chemical application and additionally reduces the toxicological and environmental risks associated with the carrier-chemical mix preparation and discard. This paper presents an implementation of a fuzzy gain scheduling of proportionalintegral-derivative (PID) controller as well as its comparison with a PID controller to adjust the fow rate of the carrier-chemical mix. Practical results obtained with a test bench for sprayers have proven the efectiveness of the fuzzy gain scheduling of PID controller proposed.
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