Unmanned Carrier Wheel Control for Stable Lateral Mode Switching
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing unmanned carrier vehicles experience significant posture changes when switching between normal and lateral driving modes due to insufficient correction of vehicle body posture during short travel distances.
Innovation Solution
The vehicle incorporates a control device that controls a braking device and steering device to manage wheel direction changes, using one set of wheels as primary and secondary steered wheels, and restricts rolling of specific wheels during mode transitions to stabilize the vehicle body.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If the vehicle switches between normal driving mode and lateral driving mode by changing wheel direction, then the vehicle can adapt to different driving directions, but the vehicle body posture changes significantly when the travel distance is short
Solution Approach 1:
The patent divides the wheel set into primary steered wheels and secondary steered wheels. The control device changes the direction of primary steered wheels first, then changes the direction of secondary steered wheels. This segmented approach to steering control allows for better management of vehicle body posture during mode transitions, reducing unnecessary posture changes while maintaining adaptability between driving modes.
Solution Approach 2:
The control device restricts the rolling of wheels included in the secondary steered wheel when changing the direction of the primary steered wheel, and restricts the rolling of wheels included in the primary steered wheel when changing the direction of the secondary steered wheel. This preliminary restriction of wheel rolling before completing the direction change prevents the vehicle body from undergoing unnecessary posture changes, thereby maintaining stability during mode transitions.
2Stability of the object's composition
If the vehicle corrects posture change during travel, then the vehicle body posture can be maintained, but the correction is insufficient when the distance from start to stop is short
Solution Approach 1:
The control device restricts the rolling of wheels during the direction change process - specifically, it restricts the rolling of wheels in the secondary steered wheel when changing the direction of primary steered wheels, and vice versa. This preliminary action prevents posture changes from occurring in the first place, eliminating the need for subsequent correction and ensuring adequate posture control even during short distance travel.
Solution Approach 2:
By restricting wheel rolling during direction changes, the system preemptively counteracts the forces that would cause vehicle body posture changes. This preliminary anti-action prevents the posture deviation that would otherwise require correction, ensuring stable posture control regardless of the travel distance.
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
This configuration effectively suppresses vehicle body posture changes during mode transitions by controlling wheel direction and rolling, ensuring stable switching between normal and lateral driving modes.
Implementation Method 1
a braking device for restricting rolling of at least two of the wheels
Implementation Method 2
a steering device for changing the direction of the plurality of wheels
Data Source
AI summary
An unmanned carrier vehicle switchable between normal and lateral driving mode includes: wheels (a left front wheel, a right front wheel, a left rear wheel, and a right rear wheel), a drive unit that restricts rolling of the left front wheel and the left rear wheel, a steering device that changes direction of the wheels, and a control device. The control device controls the steering device to change direction of the right front wheel and the left rear wheel after changing direction of the left front wheel and the right rear wheel when switching between normal and lateral driving mode; and further controls the drive unit to restrict rolling of the left rear wheel when changing direction of the left front wheel and the right rear wheel, and to restrict rolling of the left front wheel when changing direction of the right front wheel and the left rear wheel.