Selectable Steering Resistance for Stable Work Machine Handling
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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 undesirable steering behaviors such as understeer and oversteer. Additionally, operators seek more control over the steering system with adjustable sensitivity and feedback.
Innovation Solution
A multi-selectable application mode steering system that includes a controller capable of switching between at least two operating modes based on predetermined criteria such as travel speed, work machine status, location, and implement status. This system uses a brake and a motor to provide resistance and feedback to the steering device, allowing for adjustable sensitivity and improved operator control.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Stability of the object's composition
If the steering system uses a fixed brake mechanism, then the steering stability is improved, but the steering sensitivity and operator control are reduced
Solution Approach 1:
The patent applies dynamics by making the brake mechanism controllable and adjustable rather than fixed. The brake can be dynamically engaged or disengaged based on operating conditions (field mode vs. transport mode), allowing the steering system to transition between stable and sensitive states as needed.
Solution Approach 2:
The patent changes the resistance parameter of the steering system by using a brake that can be applied or released. In field mode, the brake provides resistance for stability; in transport mode, the brake is released to allow sensitive operator control. This parameter change resolves the contradiction between stability and sensitivity.
2Measurement precision
If the steering system provides heavy resistance for stability, then the steering control precision is improved, but the operator fatigue increases
Solution Approach 1:
The system dynamically adjusts resistance levels based on operational context. During field operations where precision is critical, the brake provides heavy resistance. During transport where less precision is needed, the brake is released to reduce operator effort and fatigue.
Solution Approach 2:
The brake resistance is applied periodically or conditionally rather than continuously. The system switches between high-resistance and low-resistance states based on whether the machine is in field mode or transport mode, reducing cumulative operator fatigue while maintaining precision when needed.
3Ease of operation
If the steering system is designed for high sensitivity, then the operator control is improved, but the steering stability deteriorates
Solution Approach 1:
The system is designed to be dynamically reconfigurable between high-sensitivity and stable states. The brake mechanism can be engaged to provide stability or disengaged to allow high sensitivity, depending on the operational mode selected by the operator or determined by the control system.
4Force
If the steering system uses motor assistance, then the steering effort is reduced, but the steering feedback and operator feel are diminished
Solution Approach 1:
The brake acts as an intermediary between the operator and the motor assistance. When the brake is applied, it provides mechanical feedback and resistance that the operator can feel, while the motor still provides assistance to reduce overall steering effort. This mediator allows both motor assistance and tactile feedback to coexist.
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 effectively adjusts steering sensitivity and feedback based on operational conditions, enhancing operator control and reducing fatigue by providing appropriate resistance and feedback, thus improving the overall stability and maneuverability of the work machine.
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.