Subway vehicle wheel set online dynamic detection system and vehicle speed detection method

Abstract

The invention discloses a subway vehicle wheel set online dynamic detection system and a vehicle speed detection method. The subway vehicle wheel set online dynamic detection system is characterized in that a first magnetic steel sensor and a second magnetic steel sensor are installed on a rail, the distance between the first magnetic steel sensor and the second magnetic steel sensor is set to be S, wheels of a subway train sequentially pass through the first magnetic steel sensor and the second magnetic steel sensor in running to cause magnetic path variations in the magnetic steel sensors, pulse signals are generated and transmitted to a control module through a driving module, the control module collects and records the pulse signals of the first magnetic steel sensor and the second magnetic steel sensor and the time difference of two pulse signals of each wheel, the difference of time when departing from the second magnetic steel sensor of wheels located the same positions below a front bogie and a rear bogie is recorded, the control module calculates according to detected data to acquire the acceleration of uniformly accelerated motions of the vehicle, displacement information of the vehicle at any moment can be acquired according to a displacement formula that Sy=v0.t+0.5a.t2, the displacement information is used to replace displacement information of a previous uniform motion Sy=v.t, wheel size parameters are measured, and the measurement accuracy is improved.

Description

technical field [0001] The invention relates to the field of wheelset online dynamic detection systems, in particular to a subway vehicle wheelset online dynamic detection system and a vehicle speed detection method. Background technique [0002] With the comprehensive speed-up of existing passenger trains and the large-scale use of high-speed EMUs in my country, wheelset is an extremely important component in the running part of the vehicle; it not only bears the full weight of the car body, but also transmits the friction between the wheel and the rail. Action force; the wheelset needs to bear large static and dynamic loads, assembly stress, thermal stress generated by the brake shoe, brake pad, and centrifugal force when passing through the curve, etc.; therefore, whether the wheelset can maintain a good technical state, It is related to the absolute safety of driving. [0003] With the informatization upgrade of the railway system, the requirements for real-time monitorin...

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Problems solved by technology

[0003] With the information upgrade of the railway system, various units of the railway system have higher and higher requirements for real-time monitoring of the running status of the vehicles; the wheelset bears the entire weight of the vehicle, and the wheelset bears the weight of the vehicle body and the vehicle when the vehicle runs at high speed on the rails The various static and dynamic forces transmitted from both sides of the rail are complicated to handle and the operating environment is harsh; during the operation of the wheelset, there may be faults such as oversize, excessive wear, and abrasion and peeling of the tread surface, which will seriously affect the train if not discovered in time driving safety

[0004] Because parameters such as wheel rim height, rim thickness, and wheel diameter are all calculated by comprehensive calculation of measurement data and vehicle speed, the measurement accuracy of online dynamic detection is greatly affected by vehicle speed; but general railway freight vehicles usually maintain is traveling at a constant speed, while subway vehicles will frequently accelerate and decelerate, and subway vehicles are passenger vehicles, which put forward higher requirements for the safety and comfort of subway vehicles. Considering the vehicle as moving at a constant speed, the calculated results after measurement have large deviations and a high false alarm rate; some systems use multiple speed sensors installed in the test area to test the speed of the vehicle at different times, which is costly , the installation is complicated, and the system reliability is greatly reduced

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