Building Controller Occupancy Logic Using Geofence and Schedule
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Solution Overview
Problem
Building control systems, such as HVAC systems, lack advanced control options when determining occupancy, relying primarily on geofencing and time-based scheduling, which may not provide sufficient flexibility or energy efficiency.
Innovation Solution
Implementing a method that combines geofencing with a time-based schedule, allowing building controllers to adjust settings based on the presence or absence of mobile devices within a geofence, using different settings for various time periods, enabling more nuanced control of HVAC systems.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If geofencing is used to determine occupancy, then the building controller can adjust HVAC settings based on presence, but the system lacks nuanced control during occupied periods
Solution Approach 1:
The patent combines geofencing technology with time-based scheduling into a unified control system. The geofence module detects mobile device proximity while the schedule module provides time-based settings, and their integration allows the HVAC system to leverage both location data and temporal patterns for comprehensive occupancy-based control during both occupied and unoccupied periods.
Solution Approach 2:
The system dynamically switches between geofence-based control and time-based schedule control depending on occupancy status. When the geofence detects presence, it activates occupied-period schedules; when absent, it activates unoccupied-period schedules. This dynamic adaptation provides nuanced control flexibility while maintaining operational simplicity through automated transitions.
2Extent of automation
If time-based scheduling is used, then the system provides automated control, but it cannot adapt to actual occupancy patterns
Solution Approach 1:
The geofence module provides real-time feedback on occupancy status to the HVAC controller by detecting mobile device proximity. This feedback mechanism allows the automated time-based scheduling system to adapt its behavior based on actual occupancy patterns, switching between occupied and unoccupied schedules dynamically rather than following a rigid predetermined timetable.
Solution Approach 2:
The system pre-configures multiple schedules (occupied-period schedules and unoccupied-period schedules) in advance through the schedule module. These preliminary actions allow the system to automatically select and implement the appropriate schedule based on real-time geofence detection, providing both automation and adaptability without requiring real-time manual intervention.
3Ease of operation
If the HVAC system runs continuously to maintain comfort, then user comfort is ensured, but energy consumption increases
Solution Approach 1:
The system applies partial action by selectively activating HVAC operation only when needed based on occupancy detection. The geofence module detects presence and triggers occupied-period schedules that provide comfort, while unoccupied-period schedules reduce or suspend operation to save energy. This partial operation approach maintains comfort during occupied periods while minimizing energy consumption during unoccupied periods.
Solution Approach 2:
The system changes operational parameters (temperature setpoints, humidity levels, equipment runtime) based on occupancy status detected by the geofence module. During occupied periods, parameters are adjusted to prioritize user comfort; during unoccupied periods, parameters are modified to reduce energy consumption. This dynamic parameter adjustment resolves the contradiction between comfort and energy efficiency.
Data Source
AI summary
A building control system that uses geofencing in conjunction with a time-based schedule when control one or more building systems. In one example, geofencing may be used to determine if the building is occupied or unoccupied. If the building is determined to be unoccupied via geofencing, the building controller may control to an unoccupied setpoint. If the building is determined to be occupied via geofencing, the HVAC controller may control in accordance with a time-based schedule.