Forklift Steering Ratio Control in Confined Rack Aisles
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Solution Overview
Problem
Materials handling vehicles lack effective systems to dynamically adjust operational parameters based on real-time positioning and object detection, leading to potential collisions and inefficient operation in confined spaces.
Innovation Solution
A materials handling vehicle equipped with a sensing device and controller that modifies parameters such as maximum turning angle, steered-wheel-to-steering-device ratio, and lift height based on proximity to walls or racks and detected objects, and uses a light source to indicate limited operation areas, ensuring safe and efficient navigation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If the vehicle uses a fixed steering ratio and maximum turning angle, then the steering system is simple and reliable, but the vehicle cannot adapt to confined spaces and may collide with walls or racks
Solution Approach 1:
The patent implements dynamic steering control by modifying the steered-wheel-to-steering-device ratio based on detected objects. The controller adjusts the steering ratio in real-time according to the vehicle's proximity to walls or racks, enabling adaptive navigation in confined spaces while maintaining system reliability through controlled complexity
Solution Approach 2:
The system changes steering parameters (maximum allowable turning angle and steering ratio) based on environmental conditions detected by sensing devices. When objects are detected within a predefined distance, the controller modifies these parameters to prevent collisions, allowing the vehicle to adapt to different operational environments
2Reliability
If the vehicle operates with fixed parameters, then the control system is simple, but collision risk increases in tight spaces
Solution Approach 1:
The patent employs a feedback mechanism where sensing devices continuously monitor the vehicle's environment and provide data to the controller. The controller uses this feedback to dynamically adjust steering parameters and alert the operator to potential collision risks, thereby improving safety through real-time environmental awareness
Solution Approach 2:
The system performs preliminary detection of potential obstacles using sensing devices before collisions occur. The controller proactively modifies steering parameters and provides operator alerts in advance, allowing preventive action to be taken before hazardous situations develop
3Manufacturing precision
If the vehicle uses dynamic parameter adjustment based on sensing data, then navigation precision in tight spaces improves, but the device complexity increases
Solution Approach 1:
The patent replaces complex mechanical steering adjustment mechanisms with an electronic control system. The controller electronically modifies the steering ratio and maximum turning angle based on sensing device data, achieving precise navigation in tight spaces through software-based parameter adjustment rather than mechanical complexity
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.