Forklift Proximity Speed Control Using Travel Direction
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Solution Overview
Problem
Conventional truck-to-truck proximity detection systems using ultra-wideband (UWB) sensors cause unnecessary productivity losses by slowing down vehicles regardless of direction, even when collisions are unlikely, due to their inability to determine vehicle direction and limited detection range.
Innovation Solution
A proximity detection and speed control system that uses UWB sensors in conjunction with direction-of-travel information to enable/disable automatic slow-down functions based on a recommended travel direction, allowing vehicles to operate without interference when traveling in the recommended direction and only slowing down when necessary.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional UWB proximity detection systems slow down vehicles whenever two trucks are within predetermined distance, then collision avoidance is improved, but productivity is reduced due to unnecessary slow-downs when direction of travel is not considered
Solution Approach 1:
The system dynamically adjusts the slow-down function based on real-time direction-of-travel data. When trucks are traveling in opposite directions (head-on risk), the slow-down function is enabled. When traveling in the same direction (lower collision risk), the slow-down function is disabled. This dynamic adaptation resolves the contradiction by making the safety system context-aware rather than static.
Solution Approach 2:
The system changes the operational parameter (slow-down activation) based on the direction-of-travel parameter. By monitoring whether trucks are moving toward or away from each other, the system adjusts its safety intervention accordingly, allowing productivity maintenance when collision risk is low while preserving safety when risk is high.
2Productivity
If advanced directionality-determining systems are implemented, then productivity is increased by reducing unnecessary slow-downs, but system cost increases significantly
Solution Approach 1:
The system makes the existing UWB proximity detection system multi-functional by adding direction-of-travel detection capability. Instead of requiring a completely new expensive directional sensor system, the invention leverages the existing proximity system and enhances it with direction information from available truck sensors, achieving directional awareness at minimal additional cost.
Solution Approach 2:
The system uses an intermediary approach by integrating direction-of-travel data from existing truck sensors into the proximity detection algorithm. Rather than implementing complex directional sensors, the invention mediates between simple distance detection and full directional awareness by using readily available travel direction information to enhance the basic UWB system.
3Reliability
If UWB sensors are used for proximity detection, then reliable and inexpensive collision detection is achieved, but direction determination capability is lost
Solution Approach 1:
The system merges the functionality of proximity detection (UWB sensors) with direction-of-travel detection by combining data from both sources. The UWB system provides reliable distance information while separate direction sensors provide travel direction data, and the controller integrates both to make informed slow-down decisions, achieving both proximity reliability and direction awareness.
Solution Approach 2:
The system segments the detection function into two independent components: proximity detection (handled by UWB sensors) and direction detection (handled by separate direction sensors). This segmentation allows each component to specialize in its strength while the integrated system achieves both capabilities, avoiding the need for a single complex directional system.
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
Balances productivity and collision avoidance by preventing unnecessary slow-downs, increasing operational efficiency while maintaining safety, and is cost-effective compared to systems that determine directionality.
Implementation Method 1
UWB provides a reliable and inexpensive mechanism for determining proximity between primary and secondary sensors
Data Source
Figure 1A~2
Figure 1B
Figure 3A
AI summary
A proximity-detection and speed-control system (400) for a materials-handling vehicle (200a) is provided with a recommended direction of travel (R) for the vehicle (200a). A proximity sensor (410) is provided to determine proximity to a restricted member, such as another vehicle (200b), a high-value object (610), a dangerous location (710), or a pedestrian (810). If the vehicle (200a) is traveling in the recommended direction (R) or if other predetermined conditions are satisfied, the speed control function can be disabled. If, however, the vehicle (200a) is not travelling in the recommended direction (R) and the proximity sensor (410) indicates the vehicle (200a) is within a restricted distance of the restricted member (200b), (610), (710), (810), the speed control function (440) is triggered to restrict the maximum speed of travel of the vehicle (200a) and to slow the vehicle (200a) if needed. Other conditions could also be used to implement speed control.