Steering Assistance and Roll Control via Biasing Units
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Solution Overview
Problem
Existing self-propelled lawn care vehicles, such as fertilizer and herbicide spreaders, face challenges in steering and roll control, particularly on uneven terrain and when loaded, which affects operator comfort, safety, and vehicle control, especially for vehicles with a high center of gravity.
Innovation Solution
The implementation of steering assistance and roll control systems using biasing units integrated with articulating joint mechanisms, which apply counteracting forces to maintain alignment and stability during yaw and roll movements, thereby enhancing vehicle handling and control.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If articulating joint mechanisms are used to enable steering and roll movement, then vehicle maneuverability is improved, but vehicle stability and control become difficult to maintain
Solution Approach 1:
The patent applies spring biasing units that dynamically adjust the mechanical parameters of the articulating joint mechanism. The springs provide a restoring force that changes with the degree of articulation, automatically adjusting the system's stiffness and damping characteristics to maintain stability while allowing necessary movement for steering and terrain adaptation.
Solution Approach 2:
The biasing units function as counteracting elements that generate forces opposite to the articulation movement. When the front end articulates relative to the sulky, the springs produce restoring forces that counterbalance the articulation, preventing excessive movement and maintaining vehicle stability during operation.
2Device complexity
If manual steering control is used without power assist, then system complexity is reduced, but operator physical exertion and control difficulty increase
Solution Approach 1:
The steering system is designed to be self-assisting through the biasing units. The spring mechanisms automatically provide steering assistance by generating restoring forces that help return the vehicle to straight-line travel after turns, reducing the operator's physical effort without requiring complex powered steering systems.
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
These systems improve vehicle handling by actively counteracting biasing forces in yaw and roll directions, enhancing operator comfort, safety, and control, especially on uneven terrain and when turning or encountering obstacles.
Implementation Method 1
a biasing unit configured to span the articulating joint mechanism such that a longitudinal axis of the biasing unit is vertically aligned with the longitudinal centerline of the articulating joint mechanism... the biasing unit applies a counteracting force to bias the first and second wheeled members toward the straight-line arrangement
Implementation Method 2
a biasing unit configured to apply, when the articulating joint mechanism pivots about the horizontal pivot axis thereof in either of the first and second roll directions, a force to bias the first and second wheeled members toward the level alignment arrangement
Data Source
AI summary
Steering and roll control systems to counteract yaw and/or roll forces during operation of a vehicle having first and second wheeled members coupled together by an articulating joint mechanism that is configured to pivot in a yaw direction and/or a roll direction. The steering assistance systems include a biasing unit configured to apply a counteracting force to bias the first and second wheeled members toward a straight-line arrangement thereof. The roll control systems include an additional biasing unit configured to apply a counteracting force to bias the first and second wheeled members toward a level alignment arrangement of the vehicle.