This article focuses on accurate identification of the critical moving characteristics of the high speed on/off valve. Typically, there are two strategies for identifying the critical moving characteristics, including calculation strategy based on force balance and strategy for detecting the coil current’s certain points. However, the accuracy of the two above strategies needs to be improved. Therefore, to improve the identification accuracy of the high speed on/off valve’s critical moving characteristics, an identification strategy for detecting the time derivative of the coil current is proposed. First, a mathematical model of the high speed on/off valve (including electromagnetic sub-model and mechanical-fluid sub-model) is established. And on this basis, relationship between the coil current’s derivative and the valve’s critical moving characteristics is analyzed which reveals the changing rule of the coil current’s derivative causing by the ball valve’s moving. Finally, the changing rule of the coil current’s derivative is verified by the comparative simulations and experiments, which also indicate that, with the proposed identification strategy, the maximum identification error of the critical opening/closing time is only within 6%, and the maximum identification error of the total opening/closing time is still small (2.9%), compared to other identification strategies in the previous literatures.

本文着重于准确识别高速开关阀的关键运动特性。通常，有两种用于识别关键运动特性的策略，包括基于力平衡的计算策略和用于检测线圈电流的特定点的策略。但是，上述两种策略的准确性需要提高。因此，为提高高速开关阀临界运动特性的识别精度，提出了一种检测线圈电流时间导数的识别策略。首先，建立了高速开关阀的数学模型（包括电磁子模型和机械流体子模型）。在此基础上 分析了线圈电流导数与阀的临界运动特性之间的关系，揭示了由球阀的运动引起的线圈电流导数的变化规律。最后，通过比较仿真和实验验证了线圈电流导数的变化规律，这也表明，采用提出的识别策略，临界开合时间的最大识别误差仅在6％以内，且最大与以前文献中的其他识别策略相比，总打开/关闭时间的识别误差仍然很小（2.9％）。