The Design and Experimentation of a Differential Grain Moisture Detection Device for a Combined Harvester

Author:

Liu Zheng1,Yang Tengxiang1,Li Panpan2,Wang Jin1,Xu Jinshan1,Jin Chengqian12

Affiliation:

1. Nanjing Institute for Agricultural Mechanization, Ministry of Agriculture and Rural Affairs, Nanjing 210014, China

2. College of Agricultural Engineering and Food Science, Shandong University of Technology, Zibo 255049, China

Abstract

To conveniently implement the online detection of grain moisture in combined harvesters and the address the influence of the no-load measurement baseline, thereby enhancing detection accuracy and measurement continuity, this study developed a differential grain moisture detection device. For its convenient installation and integration on combined harvesters, a single-pole plate measurement element with a 1.6 mm thick epoxy resin coated with a 2-ounce copper film was designed, and a grain moisture detection device was constructed based on the STM32F103 microprocessor (STMicroelectronics International NV, Geneva, Switzerland). To enhance the device’s interference resistance, a differential amplification measurement circuit integrated with high-frequency excitation was designed using a reference capacitance. To improve the resolution of the measurement circuit, Malab simulations were conducted at different excitation frequencies, ultimately selecting 30 kHz as the system’s excitation signal frequency. To validate the effectiveness of the measurement circuit, validity tests were performed on the constructed sensor, which showed that the sensor’s measurement voltage could effectively distinguish the moisture levels in grains, with a determination coefficient (R²) reaching 0.9978. To address the errors in moisture measurement caused by changes in grain temperature, an interaction experiment of the effect of moisture content and temperature on the measurement voltage was conducted using an integrated temperature sensor, resulting in the construction of a moisture content calculation model. Both the indoor static detection and field testing of the moisture detection device were conducted, indicating that the maximum average error in static measurements was 0.3%, with a maximum relative error of 0.47%, and the average relative error in field tests was ≤0.4%.

Funder

National Key Research and Development Program of China

Key Research and Development Program of Jiangsu Province

Special fund for basic scientific research business of central level public welfare research institutes

Publisher

MDPI AG

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