A temperature detection method for railway passenger car bearings and a digital/analog integrated temperature sensor

Abstract

The invention relates to a method for detecting the temperature of a railway passenger car bearing and a digital / analog integrated temperature sensor. The sensor probe is internally integrated with a digital and analog temperature measuring chip, and the two temperature measuring chips simultaneously detect the temperature of the axle box and pass the temperature signal through the transmission line. Send to the detection host, the detection host receives two temperature signals in sequence, and independently judges the two signals. Then, according to the temperature selection conditions, select the temperature of the two channels, and finally select the temperature of the channel for display and analysis. Using this method to detect the shaft temperature has the beneficial effect of higher reliability than the previous single-type sensor detection method.

Description

technical field [0001] The invention relates to an axle temperature detection technology for improving the temperature detection reliability of a railway passenger car bearing, 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 establishment of railway standards. The safety of railway operations plays an important role. [0003] However, the current axle temperature system has problems such as unstable operation and unreliable temperature measurement. The problem is mainly reflected in the false alarm of the alarm, the jump of the sensor data, and the open and short circuit faults. According to statistics, from January to August 2016, the number of alarms and failures of the entire axle temperature s...

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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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