Automatic Steering with Selective Four-Wheel Engagement
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Solution Overview
Problem
Agricultural machines with automatic steering face complexity and susceptibility to error when operators need to switch between two-wheel and four-wheel steering modes, particularly in tight turns, due to the need for manual control manipulation.
Innovation Solution
A steering control system that automatically switches between two-wheel and four-wheel steering modes based on sensed or predicted turns, defaulting to two-wheel steering for straight paths and engaging four-wheel steering for turns greater than a threshold, thereby simplifying operator control and optimizing turning performance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If four-wheel steering is activated when automatic steering is enabled, then turning performance is improved, but automatic steering control becomes more difficult
Solution Approach 1:
The system dynamically switches between two-wheel steering mode and four-wheel steering mode based on the magnitude of the turn detected by the steering controller. During straight travel or gentle curves, two-wheel steering is used for stability. When a turn exceeds a predetermined threshold magnitude, the system automatically transitions to four-wheel steering mode to improve turning performance, and switches back when the turn magnitude decreases below the threshold.
2Adaptability or versatility
If manual switching of four-wheel steering is required in automatic steering mode, then turning control is improved, but system complexity and susceptibility to error increase
Solution Approach 1:
The steering controller automatically detects when the machine enters or exits turns based on steering wheel position sensors or GPS data, and autonomously activates or deactivates four-wheel steering mode without requiring operator intervention. The system monitors turn magnitude continuously and self-manages the transition between steering modes, eliminating the need for manual control manipulation.
Solution Approach 2:
The system uses feedback from steering wheel position sensors, gyroscopes, or GPS location data to continuously monitor the machine's turning state. When the feedback indicates a turn magnitude exceeding the threshold, the controller automatically activates four-wheel steering. When the turn magnitude falls below the threshold, the controller deactivates four-wheel steering and returns to two-wheel steering mode.
3Ease of operation
If four-wheel steering is deactivated when automatic steering is enabled, then automatic steering control is simplified, but turning performance in headlands deteriorates
Solution Approach 1:
The system dynamically adjusts the steering configuration based on operational conditions. During straightaway paths, two-wheel steering is maintained for simplified control. When approaching headlands or detecting turns above the threshold magnitude, the system automatically transitions to four-wheel steering to optimize turning performance, and reverts to two-wheel steering when exiting turns.
Data Source
AI summary
Automatic steering and four-wheel steering are configured on an agricultural machine so that when automatic steering is enabled, a control system selectively activates and deactivates four-wheel steering depending on sensed turning or non-turning states of the machine. When automatic steering is enabled, the machine can automatically steer, such as according to a prescription map. In straightaway paths, corresponding to non-turning states, the control system can activate two-wheel steering. However, in the headlands of fields, corresponding to turning states, the control system can activate four-wheel steering. Such turning states can be determined based on the machines location on the map. Alternatively, such turning states can be determined based on sensed turning of the wheels. When an operator takes control of steering, such as by turning the steering wheel, automatic steering can disable, and the control system can activate four-wheel steering, to provide an optimum state for turning in the headlands of fields.