Oil pressure braking system for rail transit vehicle and control method thereof

Abstract

The invention discloses an oil pressure braking system for a rail transit vehicle. The system includes an axle, a gear box and a hydraulic pump; the axle penetrates through the gear box to serve as power input of the gear box; an output shaft of the gear box is connected with a main shaft of the hydraulic pump through a clutch device, an input oil pipe of the hydraulic pump is connected with an oil storage box, an output oil pipe of the hydraulic pump is connected with the input end of a high-pressure oil tank, the output end of the high-pressure oil tank is connected with the oil storage boxthrough a pressure relief oil pipe, and an electric control switch is connected to the pressure relief oil pipe in series. High-speed braking is achieved through oil pressure braking, real-time monitoring and adjusting can be conducted, it is guaranteed that a vehicle conducts braking according to the needed braking deceleration, braking force and braking deceleration are stable and reliable, riding comfort is high, and the system can adapt to both high-speed braking and low-speed braking.

Description

technical field [0001] The invention relates to an oil pressure brake system for a rail transit vehicle and a control method thereof. Background technique [0002] The braking device of rail transit vehicles is an important guarantee for the safe operation of vehicles. The common braking methods of rail transit vehicles mainly include mechanical braking and electric braking. Electric braking can only be realized on motor vehicles with drive systems, while mechanical brakes are installed on trailers. Mechanical brakes convert the kinetic energy of the vehicle into heat energy through the friction of the friction pair to generate braking effect, so there will be friction Auxiliary loss requires regular replacement of the friction pair, and it will generate a lot of noise and dust pollution during use. When braking at high speed, a large amount of heat energy will be generated, which will reduce the service life of the friction material and bring further speed-up to rail trans...

AI Technical Summary

Problems solved by technology

This patent has the following problems: only the air compressor operates during actual braking, there is no energy storage device, and the gas or liquid can only flow in the compressor cavity

For the gaseous medium that is easier to compress, although the air compressor can operate, the braking force provided by the brake will fluctuate greatly due to the different compression process of the compressor on the gas; for the liquid medium that is difficult to compress , Instantaneous compression will lead to a sharp increase in liquid pressure, which can easily cause damage to the compression element and cause liquid leakage. The fluctuation of the vehicle will cause uneven deceleration of the vehicle, the vehicle will move back and forth, and even the vehicle will stop suddenly due to the inability to continue to compress the liquid, which will have a great impact on the comfort and safety of the vehicle.

Due to the different vehicle speeds, the speed of the air compressor is different, and the braking force generated by the fluid brake will also be different. Therefore, the brake proposed in this patent cannot provide a relatively stable braking force and braking deceleration.

When the vehicle speed is high, the axle speed is high, the braking force is large, and the braking deceleration may greatly exceed the normal demand, causing the vehicle to brake suddenly and the occupants in the vehicle to overturn; but as the braking effect continues, the vehicle speed decreases, The braking force provided by the brake will also drop sharply, and the deceleration of the vehicle is far from meeting the braking demand, which will greatly increase the braking distance

The brake is purely passive braking. In addition to the current structural factors, the braking control is difficult to achieve, and the braking state cannot be adjusted according to the specific working conditions, and it cannot meet the application requirements of rail transit vehicles.

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