Elevator Bus Communication for Safety-Critical Data Prioritization
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Solution Overview
Problem
Existing elevator communication systems require separate dedicated communication arrangements for safety critical information, which can be inefficient and unnecessary, as they often use a common bus for both safety and non-safety information, leading to potential delays and increased component complexity.
Innovation Solution
A communication system utilizing microcontrollers to differentiate between safety critical and non-critical data packets by generating identification codes and transmitting them on a common bus, such as LON or CAN, allowing for efficient processing and transmission of safety critical information without additional dedicated buses, while maintaining the ability to handle non-critical data on the same bus.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If separate dedicated communication arrangements are used for safety critical information, then reliability of safety information transmission is improved, but device complexity increases
Solution Approach 1:
The patent segments data packets into safety critical and non-safety critical categories using identification codes. The communication system processes these segments differently - safety critical packets are transmitted with higher priority and reliability guarantees, while non-safety packets use standard protocols. This segmentation allows reliable safety transmission without dedicating entirely separate communication infrastructure.
Solution Approach 2:
The patent applies different communication qualities to different data types within the same communication bus. Safety critical information receives enhanced processing, priority transmission, and reliability mechanisms locally applied to those specific packets, while non-safety information uses standard communication. This local quality differentiation achieves reliable safety transmission without system-wide complexity.
2Device complexity
If a common bus is used for both safety and non-safety information, then device complexity is reduced, but transmission reliability and timeliness of safety information deteriorates
Solution Approach 1:
The patent implements dynamic priority handling on the common bus. When safety critical packets are detected (via identification codes), the communication system dynamically adjusts transmission priorities, allocates bandwidth, and applies reliability mechanisms to those packets. This dynamic adaptation allows the common bus to provide reliable safety transmission without requiring separate dedicated infrastructure.
3Loss of time
If separate dedicated communication arrangements are used for safety critical information, then transmission timeliness of safety information is improved, but loss of substance increases due to redundant protocol headers
Solution Approach 1:
The patent merges safety critical and non-safety critical communications into a single bus infrastructure, eliminating redundant protocol headers and communication overhead associated with separate dedicated systems. By using identification codes to distinguish packet types, the system achieves timely safety transmission without the substance loss of duplicate infrastructure.
Data Source
AI summary
Elevator safety and safety related information needs to be sent reliably to safety controlling systems. Existing elevator communication devices may be used for transmitting this information by processing the received safety and safety related information and processing it before sending it over the communication bus from the elevator car or floor equipment to the controlling devices. A separate communication unit may be used for receiving and processing safety and safety related data packets before they are transmitted over a common bus used for safety and safety non-critical submission.