Compressed air brake device and leak detection method for rail vehicles

Abstract

A leak detection method for detecting leaks in a brake pressure line of a compressed air brake system of a rail vehicle. The compressed air brake has an indirect electro-pneumatic brake with a main cylinder duct (HB) and a compressed air supply (7) and is controlled by the main duct pressure, the brake pressure duct being connected between the valve unit and the brake Guided between actuators (3). A brake test is performed in a stationary state of the rail vehicle, with the steps of: checking whether the pressure of the main cylinder pipe exceeds a predetermined limit value when the supplementary supply of compressed air from the compressed air source to the main cylinder pipe is prohibited, and if so, controlling the main cylinder pipe air duct pressure for depressing the brake actuator; monitoring main cylinder duct pressure for whether: the value of the main cylinder duct pressure occurring after depressing the brake actuator deviates from a credible value by more than a predetermined difference, and / or the pressure gradient of the main cylinder pipe pressure exceeds the predetermined pressure difference, if so, an error report is generated: there is a leak in the brake pressure pipe.

Description

technical field [0001] The invention relates to a method for detecting leaks in a brake pressure line carrying brake pressure of a compressed air brake system of a rail vehicle having an indirect electro-pneumatic brake. The invention also relates to a compressed air braking device for a rail vehicle. Background technique [0002] In known electro-pneumatic brakes, the brake pressure of each bogie, which usually has two braked axles, and each axle has two or more compressed air operated brake cylinder, the pressure sensor is arranged downstream of the unit pressure converter (EDU) configured as a relay valve. Due to such a design, however, even relatively large leaks in the brake pressure line carrying the brake pressure are not detected. The reason for this may lie in the supply capacity of the unit pressure converter (EDU), which supplies compressed air into the brake pressure line in the event of a leak, but this increases the difficulty of detecting a loss of brake pre...

AI Technical Summary

Problems solved by technology

But due to such a construction, even larger leaks in the brake pressure pipes leading to the brake pressure are not recognized

The reason for this can lie in the supply capacity of the unit pressure converter (EDU), which supplies compressed air into the brake pressure pipe in the event of a leak, but thus increases the difficulty of identifying a loss of brake pressure

This is problematic because a loss of brake pressure cannot be reliably identified

Here too, it must be assumed that not only the brake cylinder associated with the leak in the associated brake pressure line becomes ineffective, but also that the other connected brake cylinders of the bogie are also at least partially relieved by the leak.

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