ZERO POINT DRIFT COMPENSATION OF IMPACT-BASED GRAIN FLOW SENSOR WHEN COMBINE HARVESTER TILTED
For assessing effectiveness of precision farming operations, the yield map plays a very important role and it must reflect the true variation of yield in the field. As the most important component of a yield monitor system, it is desirable that the grain flow sensor exhibit a long term accuracy and stable zero-point voltage in different operation states without recalibration. The impact-based grain flow sensors, widely used in several commercial yield monitor systems, fail to give stable accuracy when the combine tilted. The purpose of this paper is to study the effects of combine harvester tilt on the zero point drift of impact-based grain flow sensor, and propose an innovated grain flow sensor design that can compensate the effect of combine harvester tilt on the zero point voltage. With the single plate impact-based grain flow sensor and a electronic campus fixed in a KUBOTA Pro-481 head-feed combine harvester, the zero point voltage of the grain flow sensor was detected while the combine harvester tilted between -15°and +15°. The result showed that there was a linear relationship between the zero point voltage and combine the obliquity, the zero point drift voltage was ±25mV when the combine harvester was tilted at ±15°. With two identical plates were mounted in parallel in front of the outlet of the combine harvester, a dual-plate differential impact-based grain flow sensor was designed to compensate the influences of zero point drift lead by combine tilt. The front plate of the new sensor was used to detect the impact of grain out of elevator, but the zero point corrupted by the pose of combine, and the rear plate was used to detect the zero point drift simultaneously. A differential algorithm could compensate the zero point drift of the new sensor. The experimental results showed that the zero point drift of 2 plates were the same as each other, and thus the overall zero point drift voltage was reduced from ±25mV to ±1mV when Combine tilted at ±15°.
Impact-based grain flow sensor tilt zero point drift compensation
Hu Junwan Luo Xiwen Chen Shuren Li Yaoming Yang Hongbo
Key Laboratory of Key Technology on Agricultural Machine and Equipment,Ministry of Education. South Key Laboratory of Modern Agricultural Equipment and Technology,Ministry of Education,Jiangsu Univers
国际会议
北京
英文
1-6
2009-10-14（万方平台首次上网日期，不代表论文的发表时间）