Remote Control Polling for Missed Message Vehicle Commands
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Solution Overview
Problem
Materials handling vehicles face challenges in efficiently managing communication between remote control devices and central controllers, leading to missed messages due to varying communication modes and latency issues, which affect the operation and control of the vehicles.
Innovation Solution
A method and system for wireless communication between a peripheral device and a central device in materials handling vehicles, involving polling with connection event requests, calculating missed messages based on communication operating modes, and determining vehicle commands based on these calculations to control the vehicle's operation, such as coasting or braking.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Use of energy by moving object
If the peripheral device operates in low power mode with reduced communication frequency, then power consumption is reduced, but message delivery reliability deteriorates due to missed messages
Solution Approach 1:
The central device calculates the number of missed messages in advance based on the peripheral device's communication operating mode and connection interval settings. This preliminary calculation allows the system to proactively adjust vehicle commands before actual missed messages cause operational issues, resolving the contradiction between power saving and message delivery reliability.
Solution Approach 2:
The system implements a feedback mechanism where the central device continuously monitors the number of missed messages and adjusts vehicle commands based on this feedback. When missed messages exceed a threshold, the system modifies control behavior (e.g., coasting instead of immediate stopping), thereby maintaining reliability while allowing the peripheral device to operate in low-power mode.
2Use of energy by moving object
If the connection interval is increased to reduce communication overhead, then power consumption is reduced, but control responsiveness deteriorates
Solution Approach 1:
The system performs preliminary calculation of missed messages based on the configured connection interval and communication mode. This allows the system to anticipate control responsiveness issues and adjust vehicle commands in advance, enabling longer connection intervals without sacrificing actual control responsiveness.
Solution Approach 2:
The system dynamically adjusts vehicle commands based on the calculated number of missed messages. When missed messages are within acceptable thresholds, the system maintains normal responsive control. When thresholds are exceeded, the system dynamically modifies control behavior to compensate for the reduced communication frequency, thereby maintaining effective responsiveness while allowing extended connection intervals for power savings.
3Use of energy by moving object
If the peripheral device skips responding to connection requests in low power mode, then power consumption is reduced, but information completeness deteriorates
Solution Approach 1:
The central device calculates the number of missed messages in advance, knowing which connection requests the peripheral device will skip. This preliminary knowledge allows the system to reconstruct complete operational information by compensating for expected missed messages, thereby maintaining information completeness while allowing the peripheral device to skip responses for power savings.
Solution Approach 2:
The calculation of missed messages acts as an intermediary mechanism that bridges the information gap created by skipped connection requests. By calculating and accounting for these missed messages, the central device can reconstruct complete operational information without requiring the peripheral device to respond to every connection request, thus maintaining information completeness while enabling power-saving skip behavior.
Data Source
AI summary
A method is provided for wireless communication between a wireless remote control device comprising a peripheral device and a controller on a materials handling vehicle comprising a central device. The method may comprise: polling via a plurality of connection event requests, by the central device, communicated with the peripheral device with which the central device is paired, the peripheral device comprising one or more activatable switches. Based on the status of one or more activatable switches, the peripheral device sending reply messages to at least a portion of the plurality of connection requests in accordance with at least one communication operating mode of the peripheral device, wherein each reply message is indicative of the status of the one or more activatable switches. Calculating, by the central device, a number of missed messages.