Method for ultrasonic real-time detection of capacity of granary of combined harvester

Abstract

The invention discloses a method for ultrasonic real-time detection of the capacity of a granary of a combined harvester. The method comprises the steps of setting of full granary alarm initial distance, acquisition of the distance between the surface of contents in the granary and the top surface of the granary, screening and outputting of the determined value of the distance between the surface of the contents in the granary and the top surface of the granary, acquisition of a combined harvester threshing failure signal and alarming, comparison between the determined value of the distance between the surface of the contents in the granary and the top surface of the granary and the full granary alarm initial distance and alarming, and the like. By the adoption of the method, the height, changing in real time, of the contents in the granary of the harvester can be calculated, and an accurate content height value can be displayed; a single-chip microcomputer compares the content interface with the alarm initial distance and judges whether the height reaches an alarm height, and a delayed alarm is prepared to be given if yes; especially, the working state of the harvester can be detected through real-time detection of threshing quality, an alarm is given in time when a threshing failure occurs, and using is reliable.

Description

technical field [0001] The invention relates to the technical field of harvester granary detection, in particular to a method for real-time detection of granary positions by ultrasonic waves with a low false positive rate for detecting the grain height in the harvester granary. Background technique [0002] Ultrasound has strong directivity, slow energy consumption, and a long distance in the medium, so ultrasonic is often used for distance measurement. The use of ultrasonic detection is often relatively fast, convenient, simple to calculate, easy to achieve real-time control, and can meet the practical requirements of industry and agriculture in terms of measurement accuracy. Ultrasonic measurement has high precision, low cost, and stable performance. It belongs to mechanical waves. It reflects and refracts at the interface of the medium, and is absorbed by the medium after entering the medium and attenuates. Ultrasonic ranging is a non-contact detection technology, which ...

AI Technical Summary

Problems solved by technology

For large agricultural harvesters equipped with pressure-type tact switches, the alarm may not work. In fact, the granary is full, but the alarm does not operate. The reason is that the grain in the granary of the agricultural machinery is mixed with a large amount of crop straw. If the straw covers the light touch switch, there will always be more gaps in the straw, and the switch cannot be further squeezed, resulting in the fact that the grain in the granary is actually full, the switch of the alarm is still in the off state, and the alarm does not work, which leads to Leakage of grain, causing unnecessary losses to farmers

[0005] Some ultrasonic non-contact measurements can avoid the above situation, and some patents also involve the application of ultrasonic to the detection technology of agricultural harvesters and granaries, but the ultrasonic technology currently used also has a high false positive rate, because the ultrasonic itself It is the beam divergence characteristic, without special algorithm processing, the generation of ultrasonic waves through the wrong path produces false alarms, and ultrasonic waves also have problems such as measurement blind spots and improper ultrasonic frequencies that cause false alarms, so far it has not been used in agricultural harvesters It has been widely used in granary detection technology

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