Abstract
The hermeticity of the electropneumatic valve directly decides the availability of locomotive control. By far, some test methods at home and abroad effectively can detect its hermeticity but at the cost of lowering automaticity, detection efficiency and accuracy, as well as undermining environmentally friendly and adding overhead. In view of the above defects, we propose the differential pressure detection to achieve the hermeticity detection on the electropneumatic valve. Aerodynamic optimization and model analysis helps design a differential pressure hermeticity gauge with MSP430 as the control core. Composed of pneumatic circuit, valve body fixture and control circuit, this gauge can automatically complete the whole hermeticity detection on electropneumatic valve. A system test proves that the gauge can quantitatively and accurately reflect the spillage and the leakage rate and realize the automation of the valve hermeticity detection. As it features low power consumption, fast detection, system stability, etc., it can effectively fill the gaps of the existing technologies. In this sense, it indeed has a good practicality and promising prospect. (Wei et al., 2016)
