Door Motion Sensing for Predictive Maintenance Retrofit
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Solution Overview
Problem
Existing door maintenance is typically performed after failure occurs, lacking predictive indicators for when maintenance is needed, and there is a need for a retrofit solution that can be applied to existing doors.
Innovation Solution
A method and system using sensors to monitor kinetic performance of doors, synchronizing data with magnetic or proximity sensors to divide it into time periods, and evaluating against reference data to predict maintenance needs, which can be retrofitted to existing doors without requiring connection to internal control systems.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If maintenance is performed after failure occurs, then the door system operates without additional monitoring components, but the door experiences periods of non-operative or less than normal operative state
Solution Approach 1:
The door system performs self-diagnosis by using its existing control system to monitor kinetic performance parameters and detect anomalies indicating maintenance needs, eliminating the need for external monitoring equipment while improving reliability
Solution Approach 2:
The control system continuously monitors kinetic performance data from sensors and provides feedback about door operation health, enabling predictive maintenance decisions based on real-time condition assessment rather than reactive maintenance after failure
2Reliability
If a predictive maintenance system is implemented, then maintenance can be performed before failure occurs, but the system requires additional sensors and data processing complexity
Solution Approach 1:
The control system performs multiple functions including both door operation control and predictive maintenance monitoring, while sensors serve dual purposes of operational feedback and condition monitoring, reducing the need for dedicated predictive maintenance equipment
Solution Approach 2:
The kinetic performance data is divided into multiple time periods for analysis, allowing the system to detect subtle changes in door behavior over time without requiring excessive data processing complexity, as each time period can be evaluated independently
3Adaptability or versatility
If existing doors are retrofitted with predictive maintenance capability, then maintenance indication can be provided for field-installed doors, but the retrofit process increases installation complexity
Solution Approach 1:
The predictive maintenance system is designed to work with existing door control systems and sensors, allowing retrofit installation without requiring complete system replacement or complex integration, as the control system already exists in most modern doors
Solution Approach 2:
The control system acts as an intermediary between existing door hardware and predictive maintenance functionality, translating kinetic performance data from standard sensors into maintenance recommendations without requiring direct connection to proprietary door system controls
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
Enables predictive maintenance by identifying potential failures before they occur, allowing for timely maintenance without needing direct access to door system controls, and can be easily adapted to various door types and installations.
Implementation Method 1
The second sensor may be a magnetometer provided on one of the door and the door frame, configured to detect a magnetic field from a magnet provided on the other of the door and the door frame
Implementation Method 2
The first sensor may comprise an accelerometer
Implementation Method 3
The first sensor may comprise a sound sensor
Data Source
AI summary
It is provided a method for determining when to perform maintenance of a door (15). The method is performed by a maintenance determiner (1). The method comprises: obtaining (40), from a first sensor (6), sensor data indicating kinetic performance of the door: defining (42) a start time of the sensor data based on a first event detected by a second sensor (7), to enable synchronisation of the sensor data: dividing (46) the sensor data in a plurality of time periods (24a-c): evaluating (48) the sensor data in each one of the plurality of time periods by comparing to reference data respectively associated with each one of the plurality of time periods; and determining (50) to perform maintenance, based on the evaluation of the sensor data.