Wireless Remote Control Polling for Missed Message Handling
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Solution Overview
Problem
Current remote control systems for materials handling vehicles face challenges in efficiently managing communication between wireless remote control devices and vehicles, particularly in determining vehicle commands based on missed messages and switch status, leading to potential operational inefficiencies and safety issues.
Innovation Solution
A method and system that utilize a central device and a peripheral device with activatable switches, implementing communication operating modes to calculate missed messages and determine vehicle commands, such as coasting or braking, based on switch status and latency, ensuring efficient and safe vehicle operation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Use of energy by moving object
If the peripheral device operates in a low-power communication mode to save energy, then energy consumption is reduced, but the reliability of message transmission deteriorates due to increased missed messages
Solution Approach 1:
The central device calculates the number of missed messages in advance based on the latency amount and connection interval parameters before determining vehicle commands. This preliminary calculation allows the system to compensate for expected missed messages in low-power communication mode, maintaining reliability while reducing energy consumption.
Solution Approach 2:
The system uses feedback from the calculated number of missed messages to adjust vehicle commands. By continuously monitoring and calculating missed messages based on connection events and latency, the system can determine appropriate commands (such as coasting or braking) that account for communication gaps, ensuring safe operation despite reduced communication frequency.
2Use of energy by moving object
If the connection interval is increased to reduce communication frequency, then energy consumption is reduced, but the precision of vehicle control deteriorates due to larger latency
Solution Approach 1:
The system changes the parameter used for command determination from direct message timing to a calculated latency-compensated parameter. By using the formula that incorporates latency amount and connection interval, the system adapts its control precision to the actual communication conditions, maintaining accurate vehicle control even with increased connection intervals and reduced communication frequency.
3Use of energy by moving object
If the peripheral device skips responding to some connection requests to save power, then energy consumption is reduced, but the accuracy of status monitoring deteriorates
Solution Approach 1:
The central device preliminarily determines the number of missed messages based on the latency amount parameter before actual communication occurs. This allows the system to anticipate and compensate for skipped connection requests, maintaining accurate switch status monitoring even when the peripheral device skips responding to some connection requests to conserve energy.
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.