Sensor validation
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Solution Overview
Problem
HVAC systems lack effective tools for reliably validating sensors, leading to potential sensor errors going unreported, which can result in inefficiency and damage to the system.
Innovation Solution
An HVAC system with a controller that determines pre-requisite criteria, such as compressor inactivity, to enter a sensor-validation mode, operating the compressor at maximum capacity for a minimum time, and comparing initial and current sensor measurements to validate sensor accuracy.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If sensor validation is performed continuously, then sensor reliability is improved, but system energy consumption increases
Solution Approach 1:
The system performs sensor validation periodically rather than continuously, using a timer to trigger validation cycles at predetermined intervals. The controller determines whether to enter sensor validation mode based on elapsed time since the last validation cycle, thereby reducing energy consumption while maintaining sensor reliability through regular periodic checks.
Solution Approach 2:
The system checks pre-requisite criteria before initiating sensor validation, including verifying compressor inactivity for a minimum period and checking whether a validation cycle is currently in progress. This preliminary filtering prevents unnecessary validation operations and reduces energy waste by only proceeding when conditions are favorable.
2Measurement precision
If sensor validation is performed frequently, then measurement precision is improved, but loss of time increases
Solution Approach 1:
The system checks whether the compressor has been inactive for at least a minimum predetermined period before initiating sensor validation. This preliminary check ensures that validation operations are only performed when the compressor is naturally idle, thereby obtaining sensor measurements without requiring additional compressor shutdown time and avoiding operational delays.
3Reliability
If sensor validation mode is entered, then sensor reliability is improved, but productivity decreases
Solution Approach 1:
The system implements periodic sensor validation cycles with predetermined intervals and duration limits. By scheduling validation operations at specific intervals rather than continuously, and by limiting each validation cycle to a maximum duration, the system maintains sensor reliability while minimizing interruptions to productive cooling operations.
Solution Approach 2:
The system performs sensor validation only partially or selectively based on pre-requisite criteria such as compressor inactivity and current operational state. Rather than validating all sensors continuously, the system performs validation only when conditions are favorable, thereby reducing the impact on productivity while still maintaining adequate sensor reliability through targeted validation events.
Data Source
AI summary
An HVAC system includes a compressor, condenser, and evaporator. A sensor measures a value associated with the refrigerant in the condenser or the evaporator, and a controller is communicatively coupled to the compressor and the sensor. The controller determines, based on an operational history the compressor, that pre-requisite criteria are satisfied for entering a sensor validation mode. After determining the pre-requisite criteria are satisfied, an initial sensor measurement value is determined. Following determining the initial sensor measurement value, the compressor is operated according to a sensor-validation mode. Following operating the compressor according to the sensor-validation mode for at least a minimum time, a current sensor measurement value is determined. The controller determines whether validation criteria are satisfied for the current sensor value. In response to determining that the validation criteria are satisfied, the controller determines that the sensor is validated.