Implementation of a fuzzy logic-based seeding depth control system

An implementation of a seeding depth control system utilizing fuzzy logic is presented. The control system presented here utilizes a microprocessor-based fuzzy logic control process in combination with a novel seeding depth gauge system and electrohydraulic control. The fuzzy algorithm is modelled upon expert human control by means of linguistic variables that describe the error between the measured seeding depth and the desired depth set point. These variables describe the direction of the error (positive, p or negative, N) as well as the magnitude (small, S, medium, M or big B). The change in error (the difference between each sampling instance) is monitored in order to provide differential control. Stability of the control system is ensured by monitoring these proportional and differential input signals. The microprocessor unit used here is the Motorola MC68HC16Z1