Dual-Mode Vehicle Steering for Tight Turns and High-Speed Stability
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Conventional vehicle steering systems limit vehicle maneuverability and stability, particularly in tight spaces, due to the maximum turn angle of steerable wheels being constrained by the vehicle's chassis and suspension, and differential steering methods are not effectively integrated into wheeled vehicles for high-speed operation.
Innovation Solution
A vehicle system that can operate in both normal steering and differential steering modes, utilizing independently controllable motors to rotate wheels at varying speeds, with a steering lock mechanism to maintain wheel orientation, enabling tighter turns and enhanced maneuverability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Speed
If conventional steering systems with steerable wheels are used, then the vehicle can operate at high speeds, but the vehicle maneuverability is limited due to maximum turn angle constraints
Solution Approach 1:
The system dynamically switches between two steering modes: normal steering mode for high-speed operation and differential steering mode for tight-space maneuvering. The steering lock mechanism dynamically locks the steering mechanism to fix wheel angles during differential steering, enabling the vehicle to adapt its steering characteristics based on operational requirements
Solution Approach 2:
The system changes the operational parameters of the steering system by locking the steering mechanism in differential steering mode, thereby fixing the wheel angles and enabling turn radius smaller than the vehicle length. This parameter change allows the vehicle to achieve tight turning circles without compromising high-speed capability
2Ease of operation
If the steering mechanism is locked to enable differential steering, then tighter turns are possible, but the steering mechanism cannot adjust wheel angles for normal steering
Solution Approach 1:
The steering lock mechanism is designed to be dynamically controllable, allowing the system to switch between locked (differential steering mode) and unlocked (normal steering mode) states. This dynamic capability enables the vehicle to adapt between tight turning radius requirements and normal steering requirements based on operational context
Data Source
AI summary
A vehicle configured to operate in a normal steering mode and a differential steering mode is disclosed. The vehicle includes at least three wheels with the first and second wheels disposed on opposite sides of the vehicle. First and second motors, independently controllable by a motor control unit, drive the corresponding wheels. A steering shaft connects a steering mechanism for changing the angle of travel of at least one wheel to a steering wheel, when the vehicle operates in the normal steering mode. When the vehicle operates in a differential steering mode, a steering lock mechanism locks the at least one wheel in a fixed angle of travel, and a sensor senses the direction the steering wheel is turned. The motor controller causes the motor to rotate the first and second wheels at different rotational speeds to turn the vehicle the direction the steering wheel is turned.