Straw Walker Oscillation Control via Inclination
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing combine harvesters with straw walkers that operate at fixed oscillation frequencies face challenges with grain loss and throughput issues due to varying inclinations, as existing control systems lack precision and responsiveness, require complex modifications, and are prone to overshooting optimal settings.
Innovation Solution
A combine harvester with a straw walker drive system and control system that adjusts oscillation frequency based on real-time inclination data, using a correlation between inclination and frequency to prevent grain loss and maintain optimal throughput, featuring a belt variator system for simplicity and ease of retrofitting, and utilizing existing sensor technology for improved reliability and precision.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of substance
If the oscillation frequency of the straw walker is increased to maintain transport velocity when traveling uphill, then grain loss is reduced, but energy consumption increases and the system becomes more complex
Solution Approach 1:
The patent implements a variable oscillation frequency system where the straw walker's oscillation frequency is dynamically adjusted based on the combine harvester's inclination angle. The control system receives inclination data from sensors and automatically modifies the oscillation frequency to maintain optimal transport velocity, eliminating the need for fixed frequency operation and resolving the contradiction between reducing grain loss and maintaining system simplicity.
Solution Approach 2:
The patent changes the operational parameter of oscillation frequency based on inclination conditions. By establishing a correlation between inclination angle and optimal oscillation frequency, the system adapts to varying terrain conditions, allowing the straw walker to operate at optimal frequencies for different slopes while maintaining manageable system complexity through automated control.
2Measurement precision
If throughput sensors are used to control the straw walker oscillation frequency, then the control precision is improved, but the sensors are exposed to hostile operating conditions reducing their reliability
Solution Approach 1:
The patent uses the inclination angle as an intermediary parameter to control straw walker oscillation frequency instead of directly measuring throughput with sensors in harsh environments. The inclination sensor, which operates in favorable conditions, provides data that is correlated to optimal oscillation frequency through pre-established relationships, indirectly achieving precise control without exposing sensors to hostile crop material conditions.
Solution Approach 2:
The patent replaces mechanical throughput measurement systems with an inclination-based control system. Instead of using sensors that physically contact or closely monitor the crop material flow, the system uses inclination sensors that measure the combine's angle relative to gravity, substituting a mechanical measurement approach with a gravitational reference approach that avoids harsh operating conditions.
3Speed
If the oscillation frequency is adjusted based on throughput sensor data, then the control responsiveness is improved, but the inertia of the straw walker drive system causes delays and overshooting
Solution Approach 1:
The patent implements preliminary action by using inclination angle measurements to predict and preemptively adjust the oscillation frequency before throughput issues actually occur. Since inclination changes are detected immediately by sensors while their effect on throughput and grain loss manifests with delay, the system adjusts frequency in advance based on the inclination data, compensating for the inherent inertia of the straw walker drive system.
Data Source
Figure 1
Figure 2~3
Figure 4
AI summary
According to the invention the combine harvester (1) comprises an inclination module (40) coupled to the straw walker control system (30). The inclination module (40) is configured to provide information on the inclination of the combine harvester (1). The straw walker control system (30) is further configured to control the controllable frequency of the oscillating movement in function of the information on the inclination of the combine harvester (1).