Pressure control method and pressure control device for braking cylinder of rail vehicle, and rail vehicle

A pressure control device for a braking cylinder of a rail vehicle, comprising:

• an acquiring module, configured to acquire an air charge-release volume of the braking cylinder and an air flowrate of the braking cylinder;
• a first controlling module, configured to determine an air charge-release duration according to the air charge-release volume of the braking cylinder and the air flowrate of the braking cylinder, and control a charge-release working duration of an air charge-release solenoid valve according to the air charge-release duration;
• and
• a second controlling module, configured to, in case where the charge-release working duration of the air charge-release solenoid valve reaches the charge-release duration, acquire a predictive pressure of the braking cylinder, and control a working state of the air charge-release solenoid valve according to the predictive pressure.

A rail vehicle, comprising:

• a braking cylinder of the rail vehicle and a pressure control device, wherein the pressure control device is connected with the braking cylinder;
• wherein the pressure control device comprises:
• an acquiring module, configured to acquire an air charge-release volume of the braking cylinder and an air flowrate of the braking cylinder;
• a first controlling module, configured to determine an air charge-release duration according to the air charge-release volume of the braking cylinder and the air flowrate of the braking cylinder, and control a charge-release working duration of an air charge-release solenoid valve according to the air charge-release duration;
• and
• a second controlling module, configured to, in case where the charge-release working duration of the air charge-release solenoid valve reaches the charge-release duration, acquire a predictive pressure of the braking cylinder, and control a working state of the air charge-release solenoid valve according to the predictive pressure.