Abstract: Through constructing the digital model of a two-stage CNG regulator to simulate the working performances, 8 factors possibly affecting the pressure stability of regulator's outlet were deliberately drawn out. Then, by the method of DOE, sensitivity of the parameters were analyzed, and the most sensitive 3 parameters were figured out to make improvements of the regulator. Consequently, comparative experiments for the 4 different regulators were conducted based on professional test platform. The experimental results reveal that the flow stability for the regulators with improvements is increased by 25% and 50% respectively under low flow conditions and high flow conditions, and the pressure stability of outlet is increased by respectively 80% and 77.8% simultaneously.

Key words: design of experiment(DOE), pressure reducing valve, simulation model, structure design

摘要： 通过构建某车用双级CNG减压阀各个腔体的仿真分析模型，获得了影响出口压力响应过程稳定性的8个影响因子。采用试验设计方法对上述影响因子进行敏感度分析，并对影响最显著的3个因子的对应结构进行改进。通过构建的减压阀工作测试平台进行结构改进前后减压阀的对比试验，结果表明：改进后的减压阀在小流量工况下的流量特性的稳定性能提高了25%，输出压力特性的稳定性提高了80%；在大流量工况下的流量特性的稳定性能提高了50%，输出压力特性的稳定性提高了77.8%。

关键词: 试验设计, 减压阀, 仿真模型, 结构设计