Proportional solenoids are generally preferred in the solenoid valve parts of electropneumatic brake valves used in brake systems of heavy vehicles. Using of proportional solenoid valve in the system, a proportional relationship is obtained between the current and the magnetic force in a specific working region, independently of the displacement of moving element. According to applied magnetic force, the moving element of the solenoid moves and the proportional flow required for the fluid part of valve is transmitted to the system. In applications about flow control, it can be seen that proportional mass flow rate output can be obtained by using on-off type solenoid valves driven by various techniques such as Pulse Width Modulation (PWM). In this study, a solenoid design which is the first phase for analyzing the usability of on-off type solenoid in electronically controlled pneumatic brake systems has been made and static characteristics of solenoid have been investigated theoretically. Solenoid has been sized according to specific design parameters and modeled by using ANSYS/Maxwell finite element program. Static characteristics of the solenoid defined by current-displacement-magnetic force and current-displacementmagnetic flux linkage curves have been obtained.
Analysis of an electropneumatic brake system with on-off valve driven by PWM technique Modeling by finite element and model based design methods Obtaining proportional output from on-off solenoid valve Figure A. The flux path of the on-off type solenoid, the model of the electro-pneumatic brake valvePurpose: Investigation using of on-off type solenoid driven by PWM technique instead of proportional solenoid in an electro-pneumatic brake valve system. Theory and Methods:Based on the present operating conditions of the system, the dynamic characteristics of the designed on-off type solenoid valve are obtained by using finite elements by ANSYS/Maxwell and model based design methods by MATLAB/ Simulink. The results obtained from both methods are consistent with each other. Electro-pneumatic brake valve system is driven by DGM technique and the proportional working behavior of the system is investigated by working with model based design method. Results:Dynamic behavior and PWM characteristics of an electro-pneumatic brake valve system for different operating conditions are presented with using finite element and model based design methods. Conclusion:It has been seen that proportional output can be obtained from electro-pneumatic brake valve outlet by using on-off type soleonid driven by PWM signals according to the frequencies determined by considering opening and closing times of the solenoid valve.
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