Research On Braking Control Of AC Drive Eleltric Locomotive

As a kind of the brake mode of the locomotive, the electro-pneumatic brake is very traditional and practical. Electro-pneumatic brake achieve the purpose of controlling the air pressure by solenoid valves controlled the electric signal. This method use the electrical signals which is fast and accurate and the air which is convenient, makes the braking system good performance and low cost. Accordingly, the research for electro-pneumatic brake has great significance.Firstly, this thesis analyse the different requirements for braking system in different working conditions such as towing vehicles、driving on its own、multiple unit mode and towing mode. Based on this analysis, I design the overall structure of locomotive brake system and the control strategy under various operating conditions. Then, I design the control technology of the pressure of brake pipe、the bogie brake control、the direct brake、the EQ pipe、the parking brake and the distributed multiple unit.Secondly, the braking system was specifically designed based on the above braking scheme, including driver brake valve、EPM of backup brake、emergency braking module、 isolating module、the electronic distributor valve、the distributor valve and so on. The thesis also analyse and research the working process of each above module.Thirdly, this thesis analyse functions of the brake control unit based on the designed brake system piping, and design the overall structure and interfaces of the brake control unit based on the functions. Then, I design the line connection between the brake control unit and the equipment in pipeline.After designing the line connection, I design the circuit for the card in the brake control unit, including I/V convert circuit、A/D convert circuit and isolation circuit in analog input card; isolation circuit and processor module in digital input card; DC-DC isolation circuit in IRV card; ect.In the end, I research the control algorithm of the equalizing reservoir pressure and the braking system, and the designed BP neural network PID algorithm was validated by simulation in Matlab and AMEsim environment. The thesis also research the control unit of the EPM of backup brake、the electronic distributor valve and EPM of direct brake.