A control method and device for a switch-type electro-pneumatic valve of an EMU

Abstract

A method and a device for controlling a switch-type electro-pneumatic valve of an electric multiple unit, the method comprising: calculating a difference value between the received real-time gas pressure obtained by performing collection in the volume chamber of the electro-pneumatic valve and a preset gas pressure to obtain a difference value; comparing the difference value with a preset error value to obtain a comparison result; controlling, according to the comparison result and the difference value, the first action of the electro-pneumatic valve; calculating an average change amount of the real-time gas pressure obtained by performing collection within a preset sampling period; and controlling, according to the difference value and the average change amount, the second action of the electro-pneumatic. The process of inflation or deflation is adjusted by introducing an average air pressure change value and a hysteresis coefficient so as to make the adjustment stable.

Description

technical field [0001] The present application relates to the field of track equipment, and in particular to a method and device for controlling a switch-type electropneumatic valve of an EMU. Background technique [0002] The switch-type electropneumatic valve used in the EMU braking system is mainly composed of a brake solenoid valve, a release solenoid valve, pipelines, controllers and pressure sensors, such as figure 1 shown. [0003] When the train is braking, an input pressure signal is given to the electropneumatic valve. At this time, the brake solenoid valve is energized, the valve port is opened, and the air source is connected to the volume chamber. As time goes by, the pressure of the volume chamber fed back by the pressure sensor It is compared with the pressure signal at all times. When the pressure signal is greater than the feedback signal, the control logic output signal controls the brake solenoid valve to inflate. When the pressure signal is smaller than ...

AI Technical Summary

Problems solved by technology

[0008] The scheme of electro-pneumatic valve control in the above method has relatively high requirements on the performance of the solenoid valve, and the solenoid valve must use a high-speed solenoid valve

And in the control process, the solenoid valve moves frequently, and the solenoid valve moves multiple times in each pressure sampling cycle, which will reduce the life of the solenoid valve

In addition, it is difficult to set PID parameters and PWM carrier frequency

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