An abnormal detection method of a temperature and humidity sensor

Abstract

The invention provides a temperature-and-humidity sensor abnormity detecting method for detecting whether temperature and humidity which are measured by a control instrument are abnormal. The controlinstrument at least comprises a measurement sensor and a control system. The measurement sensor is used for measuring the temperature and the humidity. The method approximately comprises the followingsteps of reading the measured temperature-and-humidity value of the measurement sensor and a preset CRC check code for the first time; performing comparison for determining whether the CRC check codeof the firstly read measured temperature-and-humidity value is correct; determining whether the number of times of continuous errors of the CRC check code exceeds a first number-of-times threshold; reading the measured temperature-and-humidity value of the measurement sensor and the preset CRC check code for the second time; performing comparison for determining whether the CRC check code of thesecondly read temperature-and-humidity value is correct; performing comparison for determining whether the difference between the measured temperature-and-humidity values which are read in two adjacent times exceeds a preset overlimit value; and determining whether the number of times that the difference between the measured temperature-and-humidity values measured in two adjacent times exceeds asecond number-of-times threshold.

Description

technical field [0001] The invention relates to the technical field of detection methods, in particular to an abnormal detection method of a temperature and humidity sensor. Background technique [0002] In the temperature and humidity control instrument, the temperature and humidity measurement sensor is the core component of an instrument. If the measurement sensor is wrong, the control function of the instrument will be affected, and the temperature and humidity will not be controlled, which may cause extreme temperatures. or extreme humidity, with catastrophic consequences. The error detection and error correction of the measurement sensor is an indispensable part of the instrument. Usually, the temperature and humidity sensor and the control system of the instrument are installed separately, and they are connected by data lines using long-distance communication. Due to various electromagnetic interference, the temperature and humidity values ​​read back from the sensor...

AI Technical Summary

Problems solved by technology

[0002] In the temperature and humidity control instrument, the temperature and humidity measurement sensor is the core component of an instrument. If the measurement sensor is wrong, the control function of the instrument will be affected, and the temperature and humidity will not be controlled, which may cause extreme temperatures. or extreme humidity, will have catastrophic consequences

The error detection and error correction of the measurement sensor is an indispensable part of the instrument. Usually, the temperature and humidity sensor and the control system of the instrument are installed separately, and they are connected by data lines using long-distance communication. Due to various electromagnetic interference, the temperature and humidity values ​​read back from the sensor are wrong. If the controller quotes the wrong measurement value, it will cause the control instrument to lose control, and extreme temperature or extreme humidity will easily occur, resulting in catastrophic damage. as a result of

[0003] Furthermore, most measurement sensors now attach a CRC check code to the measured data during transmission. If the sensor causes an error in the measurement data for some reason, the comparison between the measurement data and the CRC check code will be wrong; because The ambient temperature or humidity will not change greatly in a short period of time (such as within 1 second). If the sensor causes a large difference in the data of the two measurements for some reason, the measurement data may be wrong; and If there is an error in the measurement data or because the communication interface is subjected to various electromagnetic interferences, the sensor is reset and initialized, which may cause the sensor that is normally running to work intermittently, resulting in discontinuous or inaccurate measurement.

Images