Forklift Steering Control With Proximity-Based Turning Limits
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Solution Overview
Problem
Materials handling vehicles lack effective assistance systems to prevent collisions with walls or racks and to manage operations in confined spaces, leading to potential damage and operational inefficiencies.
Innovation Solution
A materials handling vehicle equipped with a sensing device and controller that modifies steering parameters and lift height based on proximity to walls or racks, and uses a light source to designate limited operation areas, ensuring safe operation and efficient navigation in aisles.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If the vehicle operates in confined spaces near walls or racks, then maneuverability is improved, but collision risk increases
Solution Approach 1:
The sensing device performs preliminary detection of walls and racks before the vehicle reaches dangerous proximity. The controller receives position information from the sensing device and proactively modifies steering parameters and activates warning lights before a collision can occur, allowing the operator to take preventive action.
Solution Approach 2:
The system continuously monitors vehicle position relative to walls and racks using the sensing device, and provides real-time feedback to the operator through the controller. The controller modifies steering parameters based on detected position, creating a closed-loop feedback system that dynamically adjusts vehicle behavior to prevent collisions while maintaining maneuverability.
2Ease of operation
If the maximum turning angle is increased for better maneuverability, then navigation in tight spaces is improved, but the risk of hitting walls or racks increases
Solution Approach 1:
The maximum turning angle is made dynamic rather than fixed. The controller automatically adjusts the maximum turning angle based on real-time position information from the sensing device. When the vehicle is far from walls or racks, a larger turning angle is permitted for better maneuverability. When proximity detection triggers, the maximum turning angle is reduced to prevent collisions, creating an adaptive steering system.
3Productivity
If the vehicle operates closer to walls or racks to optimize space utilization, then productivity is improved, but safety is compromised
Solution Approach 1:
The sensing device and controller act as intermediaries between the vehicle and the physical environment (walls/racks). The sensing device detects the presence and position of walls and racks, providing information to the controller which then adjusts vehicle parameters. This intermediary system enables the vehicle to operate closer to boundaries for better space utilization while maintaining safety through automated parameter modification and operator warning.
Data Source
AI summary
A materials handling vehicle includes: a power unit including: a steered wheel, and a steering device for generating a steer control signal; a load handling assembly coupled to the power unit; a controller located on the power unit for receiving the steer control signal; and a sensing device on the power unit and coupled to the controller. The sensing device monitoring areas in front of and next to the vehicle. Based on sensing device data, the controller may modify at least one of the following vehicle parameters: a maximum allowable turning angle or a steered-wheel-to-steering-device ratio.