Multi-Mode Steering System for Work Machines
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Solution Overview
Problem
Off-road work machines face challenges in maintaining stable steering characteristics due to varying surface conditions and loads, leading to operator fatigue from frequent adjustments to maintain a straight trajectory at higher speeds.
Innovation Solution
A multi-selectable application mode steering system that automatically adjusts between a first operating mode, which provides light resistance and tactile feedback suitable for field work, and a second operating mode, which engages a motor for force feedback and return-to-center assistance during transport modes.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If the steering system uses a brake to provide resistance for tactile feedback during field work, then the operator feels appropriate feedback for precise control, but the system becomes less stable and requires more operator effort at higher speeds during transport
Solution Approach 1:
The steering system dynamically switches between brake-based resistance mode for field work and motor-based force feedback mode for transport. The controller automatically selects the appropriate resistance mechanism based on operating conditions, allowing the system to adapt its characteristics rather than remaining static. This resolves the contradiction by making the steering system flexible rather than fixed.
Solution Approach 2:
The system changes the resistance characteristics by switching between two different mechanisms: brake resistance for tactile feedback during field operations and motor-generated force feedback during transport. This parameter change allows the system to optimize for precision control when needed while maintaining stability during transport.
2Ease of operation
If the steering system provides light resistance for tactile feedback during field work, then the operator has precise control, but the system becomes unstable and requires frequent adjustments at higher speeds
Solution Approach 1:
The motor component automatically provides return-to-center force and stabilizing force feedback during transport mode without requiring operator intervention. The system self-corrects steering deviations and maintains stability autonomously, eliminating the need for frequent operator adjustments that would otherwise be required with a simple light-resistance system.
Solution Approach 2:
The motor-based system provides active force feedback to the steering device during transport, creating a feedback loop that automatically counteracts steering deviations and maintains stability at higher speeds. This feedback mechanism eliminates the need for manual operator corrections.
3Reliability
If the steering system uses motor-based force feedback during transport, then the steering stability is enhanced at higher speeds, but the system loses tactile feedback needed for precise control during field work
Solution Approach 1:
The system dynamically switches between motor-based force feedback for transport stability and brake-based tactile feedback for field work precision. This dynamic adaptation allows the system to provide the appropriate feedback mechanism for each operating condition rather than using a single fixed approach.
4Reliability
If the steering system is designed for high-speed transport stability, then the steering is stable during transport, but the operator experiences fatigue from frequent adjustments during field work
Solution Approach 1:
The steering system dynamically adapts its resistance characteristics based on operating mode: using brake-based light resistance for field work to reduce operator effort and fatigue, and motor-based force feedback during transport for stability. This dynamic adaptation prevents operator fatigue by matching the resistance level to the operational context.
Solution Approach 2:
The system changes resistance parameters between operating modes: light brake resistance during field work for ease of operation, and higher motor-generated resistance during transport for stability. This parameter change directly addresses operator fatigue by reducing unnecessary resistance during field operations.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The system reduces operator fatigue by providing appropriate resistance and feedback based on the work machine's operating conditions, enhancing steering stability and control across different modes and terrains.
Implementation Method 1
a brake operably coupled to the steering device, the brake being controllably applied to apply a first amount of resistance to the steering device
Implementation Method 2
a motor operably coupled to the steering device, the motor being controllably activated to apply a second amount of resistance to the steering device
Data Source
AI summary
A steering system for controlling a direction of travel of a work machine includes a steering device controllable by an operator of the work machine. The steering device is coupled to an axle of the work machine for controlling an angular orientation of the wheels. A brake is coupled to the steering device and is controllably applied to apply a first amount of resistance to the steering device. A motor is coupled to the steering device and is controllably activated to apply a second amount of resistance to the steering device. A controller controls the steering system of the work machine in at least a first operating mode and a second operating mode. In the first operating mode, the controller controls the brake between an applied position and an unapplied position, whereas in the second operating mode, the controller controls the motor between an active position and a de-activated position.