Self-adjustment fuzzy control for threshing cylinder and its VLSI implementation

In order to improve transient performance about speed-regulating system of threshing cylinder, the problems about control of axial threshing cylinder and its hardware implementation were discussed. Self-adjustment fuzzy control algorithm about cylinder was introduced and the fuzzy controller was designed. Simulation model about threshing cylinder of 4LZ-2.0 combine and the simulation system about self-adjustment fuzzy control were set up. A hardware implementation about self-adjustment fuzzy controller of cylinder based on a single FPGA (field programmable gate array) was proposed. Results indicated that the self-adjustment fuzzy controller had better dynamic characteristic and adaptability to the abrupt changes about the load of threshing cylinder. Compared with ordinary fuzzy control, when the load increased by 40% abruptly, the system adjusting time reduced to 0.4 s from 0.9 s and overshoot reduced to 1 rad/s from 1.5 rad/s. FPGA technology of self-adjustment fuzzy control about combine cylinder has many advantages, such as convenient timing test, high inference speed and great system integration. It is an efficient method to implement intelligent control strategy.