Forklift Remote Operation Delay Detection for Responsive Control
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Solution Overview
Problem
Wireless communication delays in industrial vehicle remote operation systems can lead to reduced responsiveness and operability due to varying communication environments.
Innovation Solution
An industrial vehicle remote operation system that includes a vehicle communication unit and a remote operation device with a signal generation unit, delay time calculation unit, communication delay determination unit, and handling control unit, which calculates and manages communication delays by comparing reception and generation periods of remote operation signals to determine and handle delays effectively.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If wireless communication is performed between remote operation device and industrial vehicle, then remote operation capability is achieved, but communication delay causes reduced responsiveness
Solution Approach 1:
The system performs preliminary actions by continuously monitoring communication status and calculating delay times before they significantly impact operation. The delay time calculation unit continuously computes delay based on signal generation and reception timestamps, allowing the system to proactively adjust operations before delays cause responsiveness issues.
Solution Approach 2:
The system implements feedback mechanisms where the delay time calculation unit continuously measures communication delay by comparing signal generation timestamps from the remote device with reception timestamps at the industrial vehicle. This feedback loop enables real-time adjustment of operation timing to compensate for detected delays, maintaining responsive control despite wireless communication constraints.
2Measurement precision
If communication delay determination is performed, then accuracy in detecting delay is improved, but system complexity increases
Solution Approach 1:
The system achieves self-service by utilizing existing communication signals (remote operation signals) to carry timing information. The delay calculation leverages timestamps embedded in the operational signals themselves, eliminating the need for separate dedicated measurement signals or additional hardware, thus improving measurement precision without proportionally increasing system complexity.
Solution Approach 2:
The communication signals serve multiple functions: they control industrial vehicle operations and simultaneously provide timing data for delay calculation. The same signal transmission infrastructure used for operational control is also used for measuring communication delay, making the system multi-functional and avoiding additional complexity from dedicated measurement channels.
3Measurement precision
If multiple remote operation signals are used for delay calculation, then determination accuracy is improved, but data processing requirements increase
Solution Approach 1:
The system applies partial action by using a selective number of communication signals for delay calculation rather than processing all possible data. The delay time calculation unit computes delay based on representative signal pairs, achieving sufficient accuracy without the excessive data processing burden of analyzing every single communication signal, thus balancing precision with computational efficiency.
Data Source
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AI summary
An industrial vehicle remote operation system includes a forklift truck which includes a vehicle communication unit, and a remote operation device which includes a remote communication unit configured to perform wireless communication with the vehicle communication unit and is used for remotely operating the forklift truck. A vehicle wireless CPU of the forklift truck calculates an accumulated delay time corresponding to a difference between a reception period required to receive a plurality of remote operation signals and a generation period required for generating the plurality of remote operation signals, and performs a communication delay determination for determining whether or not a communication delay has been caused based on the accumulated delay time.