Industrial Vehicle Speed Limit Coordination Around Detected Objects
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Solution Overview
Problem
Industrial vehicles face deterioration in workability due to simultaneous imposition of multiple vehicle speed limiting functions, which hinder operations when different controls impose conflicting speed limits.
Innovation Solution
An industrial vehicle with a travel control system that includes an object detection unit, a first control unit to set a speed limit in a first vehicle speed range, a second control unit to set a higher limit in a second range, and a speed limit unit to impose the appropriate limit based on operator recognition of objects, preventing conflicts between controls.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If multiple vehicle speed limiting functions are imposed simultaneously by different control systems, then safety around objects is improved, but workability and operational efficiency deteriorate due to conflicting speed limits
Solution Approach 1:
The patent merges multiple vehicle speed limiting control systems into a unified control framework where a determination unit coordinates between first and second control systems. This unified approach allows simultaneous safety monitoring while resolving conflicting speed limit commands, thereby maintaining both reliability and productivity.
Solution Approach 2:
The determination unit acts as an intermediary between the first control system (object detection-based speed limiting) and the second control system (another speed limiting function). It receives inputs from both systems, determines their relative priorities, and outputs a coordinated speed limit command that prevents workability deterioration while maintaining safety.
2Reliability
If a strict vehicle speed limit is imposed by one control system to ensure safety, then collision avoidance is improved, but the ability to perform avoidance operations deteriorates when another control system permits higher speeds
Solution Approach 1:
The patent implements dynamic speed limit determination where the effective speed limit varies based on operational context. The determination unit dynamically selects between the first control system's strict speed limit and the second control system's higher permitted speed based on real-time conditions, allowing the system to adapt between safety-critical modes and operationally-flexible modes.
Solution Approach 2:
The system changes the speed limit parameter dynamically based on which control system's conditions are met. When the first control system detects objects requiring strict speed limiting, the speed limit parameter is set to a lower value. When the second control system's conditions are met and no objects are present, the speed limit parameter is raised to permit faster operation and improvement maneuvers.
Data Source
AI summary
An industrial vehicle includes a driving device, a travel control device configured to control the driving device, an object detection unit, a first control unit setting a limit value, when a vehicle speed of the industrial vehicle is in a first vehicle speed range, a second control unit setting the limit value when the vehicle speed of the industrial vehicle is in a second vehicle speed range, and a speed limit unit imposing the speed limit according to the limit value. The first control unit includes a starting prohibition control unit that sets the limit value and a starting permission control unit that sets the limit value. The speed limit unit imposes the speed limit according to the limit value set by the first control unit when the limit value is set by the starting permission control unit.