Control subsystem having an integration framework
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Solution Overview
Problem
Existing building automation systems (BAS) struggle to efficiently manage and control energy consumption in large buildings due to limitations in real-time feedback and control, leading to wasted energy and inefficiencies in HVAC DDC control systems, which are not well-suited for high-power event-driven applications and lack robust security features.
Innovation Solution
A pseudo-deterministic control subsystem integrated within an event-driven framework, combining direct digital control (DDC) with embedded workstation platforms, utilizing the Niagara framework for scalable and secure HVAC control, enabling rapid prototyping and near-real-time performance through efficient configuration and communication mechanisms, and enhanced security features like SSL encryption.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If event-driven control framework is used for HVAC DDC control, then system flexibility and scalability are improved, but real-time determinism and control loop timeliness deteriorate
Solution Approach 1:
The control system is segmented into two distinct execution environments: an event-driven framework for flexible supervisory control and a deterministic real-time layer for critical control loops. This segmentation allows each layer to operate with its optimal characteristics without interfering with the other, resolving the contradiction between flexibility and real-time determinism.
Solution Approach 2:
A real-time operating system layer acts as an intermediary between the event-driven control framework and the physical HVAC equipment. This intermediary ensures that time-critical control commands are executed with deterministic timing guarantees, while still allowing the upper-layer event-driven framework to provide flexible system-wide coordination and adaptability.
2Speed
If traditional DDC control systems are used, then real-time control loop response is maintained, but energy management efficiency and security features deteriorate
Solution Approach 1:
The control system is designed with multi-functionality, where a single integrated platform performs both real-time control loop execution and high-level energy management functions. The event-driven framework enables unified handling of control, monitoring, and optimization tasks, allowing the system to maintain fast response times while simultaneously implementing sophisticated energy management strategies that reduce overall energy consumption.
3Adaptability or versatility
If event-based execution model is implemented, then system scalability and integration capability are improved, but control loop oscillation and execution timing consistency deteriorate
Solution Approach 1:
The system implements dynamic execution modes that adapt to the specific requirements of different control tasks. Time-critical control loops are assigned fixed periodic execution schedules with guaranteed timing, while less critical supervisory functions operate in event-driven mode. This dynamic allocation of execution resources maintains integration flexibility while ensuring timing consistency for critical operations.
Data Source
AI summary
A pseudo determinism control subsystem for event-driven integration framework of a controller system with application relative to various parameters such as, for instance, energy consumption. Pseudo determinism, near real time and/or direct digital control combined with event driven control along with strong security and high speed throughout the controller system.