201. Research on a kind of seeding-monitoring and compensating control system for potato planter without additional seed-metering channel
- Author
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Li Hongling, Zhang Hua, Guanping Wang, Liang zhu, Sun Wei, Liu Xiaolong, and Yang Xiaoping
- Subjects
0106 biological sciences ,Computer science ,Forestry ,04 agricultural and veterinary sciences ,Horticulture ,01 natural sciences ,Computer Science Applications ,Power (physics) ,Compensation (engineering) ,Control theory ,Control system ,040103 agronomy & agriculture ,0401 agriculture, forestry, and fisheries ,Potato planter ,Clutch ,Metering mode ,Agronomy and Crop Science ,010606 plant biology & botany ,Communication channel - Abstract
Miss-seeding of spoon-type potato seed-metering device can cause significant congenital yield loss. The existing compensation scheme are mainly to install a supplementary seeding device outside the original one. This approach inevitably makes the structure of potato planter complicated, and the compensation accuracy is difficult to be guaranteed. Therefore, an idea of ‘integrated seeding and compensating potato planter based on one-way clutch’ is put forward. The normal power of seed-metering device is provided by land wheels through an one-way clutch, but the power during compensation will be provided by a special compensating motor from another one-way clutch. Since the main and compensating power to drive the spoon-type potato metering device can be switched flexibly by means of one-way clutch, the catching-up compensation can be used. Which means that, with the same time to span a standard spoon distance at the pre-compensation speed of seed-metering chain, the latter potato seed can be accelerated to catch up with the former vacancy’s target position. Consequently, no additional passageway for compensating potato seeds is needed. After the compensation, the compensating power will automatically disconnected for power off, the normal power from original land wheels will be accessed immediately again, and the system will continue to operate at normal speed. Besides putting forward this innovative idea, the catching-up compensation control theory is studied as well, the scheme and circuit of seeding-monitoring system based on infrared radiation are proposed, a simple and practical open-loop compensation control plan is adopted, and some crucial software structures and key links are shared. A prototype machine was manufactured, the field tests were conducted within the seed-metering chain speed 0.2–0.8 m/s. The results shown that, the sum of missing and wrong detection possibility is not more than 1‰. It is also found that, the increase of normal operation speed has little contribution to the rising of miss-seeding rate. One notable effect is that, the proposed seeding-monitoring and compensating control system served newly structured potato planter makes the miss-seeding rate decrease from almost 4% to just nearby 1%, even at the highest seed-metering chain speed (0.8 m/s), the compensating system described in this paper still has an opportunity, with an average value of no less than 2/3, to implement compensation successfully, so, miss-seeding can be suppressed effectively.
- Published
- 2020