Agricultural Header Pivot Sensor Linkage for Accurate Angle Measurement
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Solution Overview
Problem
Existing agricultural vehicle headers face challenges in accurately measuring the pivot angle of support arms, which is crucial for control but often falls outside the normal operating range of available pivot sensors, especially when the angle is small.
Innovation Solution
A sensor assembly with a pivot sensor directly coupled to the support arm and a linkage arm, where the pivoting of the support arm causes corresponding pivoting of the linkage arm, allowing the pivot sensor to output a total pivot angle signal that includes both the support arm and linkage arm angles, thereby ensuring accurate measurement within the sensor's typical range.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If a pivot sensor is directly coupled to the support arm to measure the pivot angle, then the measurement should be straightforward, but the measured angle often falls outside the normal operating range of the sensor, especially when the angle is small
Solution Approach 1:
A linkage arm is introduced as an intermediary mechanism between the support arm and the pivot sensor. The linkage arm amplifies the small pivot angle movement of the support arm into a larger angular displacement that falls within the sensor's reliable operating range. This intermediary linkage transforms the measurement problem by converting a small-angle measurement into a larger-angle measurement that the sensor can accurately detect.
2Adaptability or versatility
If the support arm pivots through a small angle to follow ground contours, then the header can adapt to terrain variations, but the pivot sensor cannot reliably measure such small angles
Solution Approach 1:
The linkage arm serves as a mechanical intermediary that translates the small pivot angle of the support arm into a proportionally larger angle at the sensor location. This allows the system to maintain high adaptability to terrain while ensuring the sensor operates within its optimal measurement range, resolving the contradiction between terrain following capability and measurement accuracy.
Solution Approach 2:
The linkage arm changes the angular parameter scale by amplifying the pivot angle through its geometric configuration. The relationship between the support arm pivot angle and the sensor-measured angle is governed by the linkage arm's length and orientation, transforming the measurement parameter from a small angle to a larger angle that the sensor can reliably detect.
3Measurement precision
If a linkage arm is added to amplify the pivot angle for the sensor, then the sensor can measure within its normal range, but the device complexity increases
Solution Approach 1:
The linkage arm is a simple mechanical intermediary consisting of a link and pivot points, adding minimal complexity while achieving the measurement amplification function. Compared to alternative solutions such as complex electronic signal processing or multiple sensors, the mechanical linkage provides a straightforward and reliable approach with few additional components.
Data Source
AI summary
A header for an agricultural vehicle includes: a header frame; a flexible cutter supported by the header frame and including a plurality of cutting edges; a support arm coupled to the flexible cutter and pivotable with respect to the header frame; and a sensor assembly including a pivot sensor directly coupled to the support arm and a linkage including a linkage arm coupled to the pivot sensor and the support arm such that pivoting of the support arm also causes pivoting of the linkage arm, the pivot sensor being configured to output a total pivot angle signal corresponding to a pivot angle of the support arm plus an additional pivot angle of the linkage arm when the support arm and the linkage arm pivot.