Controller with programmable hand-off-auto (HOA) switches
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Solution Overview
Problem
Existing building control systems, such as HVAC controllers, lack advanced features for efficient and intuitive control of environmental conditions, particularly in terms of manual override and automatic operation, leading to suboptimal performance and potential equipment damage.
Innovation Solution
The development of a building controller with manually-actuated HAND-OFF-AUTO (HOA) switches, programmable function block engine, and memory for configuring control signals based on switch positions and settings, allowing for enhanced control and safety features like delayed output changes and prevention of concurrent output activation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If building control systems use basic on/off switches, then the device complexity is low, but the ease of operation and control precision are insufficient
Solution Approach 1:
The control system is segmented into multiple independent HOA switches, each controlling a specific output or function. This allows the system to maintain simplicity at the component level while achieving complex control capabilities through combination, resolving the contradiction between ease of operation and device complexity.
Solution Approach 2:
The HOA switches provide dynamic control capability by allowing users to switch between HAND (manual override), OFF, and AUTO (automatic operation) modes. This dynamic switching enables the system to adapt to different operational requirements without increasing physical complexity, improving ease of operation while maintaining manageable device complexity.
2Ease of operation
If building control systems lack manual override capability, then the automation level is high, but the ease of operation and responsiveness to user needs deteriorate
Solution Approach 1:
The HAND-OFF-AUTO switches enable dynamic switching between manual override (HAND) and automatic operation (AUTO) modes. This allows the system to provide immediate manual intervention capability when needed while maintaining high automation during normal operation, resolving the contradiction between ease of operation and extent of automation.
Solution Approach 2:
The system is pre-configured with HOA switches that provide immediate manual override capability without requiring additional hardware or complex programming. This preliminary action ensures that manual control is always available when needed, maintaining ease of operation while preserving the extent of automation.
3Adaptability or versatility
If building control systems lack configuration settings for HOA switches, then the device complexity is low, but the adaptability and control precision worsen
Solution Approach 1:
The HOA switches are designed with multi-functionality, serving both as simple on/off controls and as configuration elements for different operational modes (HAND, OFF, AUTO). This universal design provides adaptability for various control scenarios without significantly increasing device complexity, as the same hardware component performs multiple functions.
Solution Approach 2:
The system utilizes parameter changes in the configuration settings associated with each HOA switch to achieve different control behaviors and adaptability. By changing software parameters rather than hardware configurations, the system achieves high adaptability while keeping the physical device complexity low.
4Reliability
If building control systems lack delayed output changes and concurrent output prevention, then the device complexity is low, but the reliability and safety worsen
Solution Approach 1:
The controller is pre-programmed with logic to prevent concurrent output activation and to implement delayed output changes based on HOA switch positions. This preliminary action ensures reliable and safe operation without requiring additional hardware components, achieving high reliability while keeping device complexity manageable through software-based solutions.
Solution Approach 2:
The system implements feedback mechanisms that monitor the state of HOA switches and automatically adjust output behavior to prevent concurrent activation and implement appropriate delays. This feedback-based control enhances reliability by continuously monitoring and adjusting system state, while maintaining manageable device complexity through intelligent software control.
Data Source
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AI summary
A building controller includes a plurality of inputs, a plurality of outputs and a plurality of manually-actuated HAND-OFF-AUTO (HOA) switches each having a HAND (H) position, an OFF (O) position and an AUTO (A) position, wherein each of the plurality of HOA switches is associated with but not directly coupled to a corresponding output of the plurality of outputs. A controller is operatively coupled to the plurality of inputs, the plurality of outputs, and the plurality of HOA switches and is configured to recognize a position of each of the plurality of HOA switches, and to control one or more of the plurality of outputs in accordance with the recognized position of each of the plurality of HOA switches as well as a plurality of programmed configuration settings associated with the plurality of HOA switches.