Motor car axle box temperature detection system and method

Abstract

The invention discloses a motor car axle box temperature detection system. The motor car axle box temperature detection system comprises a temperature detection unit, a temperature collection unit and a control unit which are connected in sequence. The temperature detection unit detects the temperature of a motor car axle box and sends the temperature to the temperature collection unit, and the temperature is sent to the control unit by the temperature collection unit. The control unit judges whether the change rate of the temperature exceeds a preset standard change rate, and if yes, the control unit judges that the temperature detection unit is abnormal and carries out non-parking processing. The invention further discloses a detection method. The temperature detection unit converts a temperature signal into a digital signal after detecting the temperature of the motor car axle box; whether the change rate of the digital signal exceeds the preset standard change rate is judged; and if yes, the temperature detection unit is determined to be abnormal, and the abnormal temperature detection unit is processed without the motor car being stopped. The system and method provided by the invention are capable of judging whether the temperature detection unit is abnormal, and the motor car operation is prevented from being influenced by stopping due to false alarming.

Description

technical field [0001] The invention mainly relates to the technical field of motor vehicles, in particular to a temperature detection system and method for an axle box of a motor vehicle. Background technique [0002] The axle box is the key component of the EMU, and the failure of the axle box will affect the normal operation of the vehicle. It is usually used to detect the temperature of the axle box to diagnose whether the axle box is working normally. At present, the axlebox temperature detection system of the EMU judges whether the axlebox is normal based on the temperature information of the axlebox. In the axle box temperature detection system, Pt100 resistance is usually used as the sensor, and the resistance value of Pt100 changes with temperature, and the temperature of the axle box can be obtained by measuring the resistance value of Pt100. If there is a deviation in the measurement of the Pt100 resistance, it will affect the accuracy of the measurement. On th...

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Problems solved by technology

In the existing method, the abnormal judgment of the sensor is based on the judgment of the static state, that is to say, if the temperature collected by the sensor exceeds the limited range, it is considered to be a fault. This method is equivalent to a pre-check on the sensor. If the temperature change of the sensor does not meet the The requirements are considered as sensor failures. This method is not applicable to vehicles, because there are many sensor failures, and the installation location is not suitable for comparative measurement; in addition, the failure is judged through redundancy. First, the sensors are grouped. If each group If the change value of the sensor in the sensor exceeds the limit value, it will be judged as a fault. This method is only suitable for redundant situations. Due to the limitation of the installation position on the vehicle, redundant sensors cannot be installed, and the detection part of each sensor is Different

In addition, because the equipment on the train is often in motion, the vibration generated by the motion will have an impact on the contact resistance and contact reliability of the connector, and have a great impact on the RTD resistance temperature measurement effect, often due to the resistance characteristics of the connected circuit The resistance change of the temperature to the sensor is mixed together to cause false alarms, and these sporadic faults do not necessarily exist permanently, so the method of pre-check or comparative check is not applicable, and the measured final resistance value does not necessarily exceed the limit range

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