A DEVELOPMENT OF A POPPET TYPE BRAKE PRESSURE CONTROL VALVE FOR A FRICTION BRAKEOF ROLLING STOCK
2002 Volume 2002 Issue 5-3 Pages 733-738
Details
2002 Volume 2002 Issue 5-3 Pages 733-738
A poppet type brake pressure control valve, which the output pressure is proportional to the input displacement, is developed to use in the hydraulic control system for friction brake of railway rolling stock. Internal feedback structure isdesigned to eliminate the reliability problem of the pressure transducer, and the poppet type valve is utilized to reducethe internal leakage, which is a problem of the conventional control valve when the electrical supply is under failure.Compensation methods for the disadvantages of poppet valve and the stability are considered together with the structure of the valve. Static and linearized dynamic models of the valve are determined to study the effects and to decide the parameters of valve. The stability and performance of valve are studied and confirmed experimen tally. The experimental results show that the response of out put pressure is improved compared with the conventional pneumaticbrake system.
