Railway passenger car bearing temperature detection method and digital/analog integrated temperature sensor

Abstract

The invention relates to a railway passenger car bearing temperature detecting method and a digital / analog integrated temperature sensor. The inner part of the sensor probe integrates digital and analog temperature measuring chips, and the two temperature measuring chips detect the temperature of the axle box at the same time and transmit the temperature signals to a detection host through transmission lines; and the detection host receives the two temperature signals sequentially and makes independent judgment on the two signals. Then according to the temperature selection conditions, the two temperatures are selected to finally decide which one to display and analyze. The use of the method for axle temperature detection can achieve more reliable and higher beneficial effects than a single sensor used detection method.

Description

technical field [0001] The invention relates to a shaft temperature detection technology for improving the reliability of railway passenger car bearing temperature detection, and belongs to the field of railway passenger car safety diagnosis. Background technique [0002] At present, railway passenger trains are equipped with a centralized axle temperature alarm system (hereinafter referred to as "axle temperature system"), which has been running on passenger trains for more than 20 years since the axle temperature system was established as a railway standard. The safety of railway operations plays an important role. [0003] However, the shaft temperature system currently in use has problems such as unstable operation and unreliable temperature measurement. The problems are mainly reflected in false alarms of alarms, sensor data jumps, open and short circuit faults, etc. According to statistics, from January to August 2016, the average number of alarms and failures of the...

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Problems solved by technology

[0005] The installation of the temperature sensor is limited by the axle end structure of the vehicle bogie and the space environment. It may be caused by water ingress or poor contact due to mechanical damage and reduced sealing, which will eventually cause false alarms and failures.

[0006] The main defect of the digital sensor (DS18B20) is that the temperature measurement range is narrow, especially the upper limit of the temperature measurement is not high enough, only -55°C ~ +125°C, so when the detection temperature exceeds 125°C, there is a certain risk of false alarm

[0007] Although the analog sensor has a wide temperature range and can reach above 160°C, its anti-interference performance is not as good as that of the digital sensor, and because the platinum resistance temperature measurement converts the change of resistance value into electrical signal transmission, it is also very sensitive to contact resistance and cannot completely solve the problem. Anti-interference technical problems, so there is still a certain risk of leakage or false alarm

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