Dynamic flow characteristics of digital hydraulic circuit based on high speed solenoid valve
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摘要:
高速电磁阀作为数字液压回路的核心控制元件，其动态特性决定了该液压回路的流量特性表现，为提高数字液压回路流量特性计算精度，提出一种包含可控占空比修正特征的液压回路动态流量计算模型，并通过线性占空比区内的实测流量结果验证了所提模型的准确性。实验结果表明：与理想开关无延迟模型相比，实际开关有延迟动态流量特性模型所求瞬时流量最大相对误差减小20.3%，平均相对误差减小9.3%，平均输出流量最大误差减少73%，计算精度显著提升。当高速电磁阀阀口有效开启时间
t se处于2～7.43 ms之间，工作频率由50 Hz提升至100 Hz，液压回路平均输出流量高出额定输出流量40%，流体惯性效应对输出流量影响显著。Abstract:High-speed solenoid valves are the key control element of digital hydraulic circuits, and their dynamic properties directly affect the circuit's flow performance. To improve the computational accuracy of the flow characteristics in digital hydraulic circuits, a flow calculation model incorporating a controllable duty cycle correction module is proposed in this article. The accuracy of the proposed model was validated using measured flow data within the linear duty cycle region. Experimental results demonstrate that, compared to the ideal switch model without delay, the dynamic flow characteristics model with actual switching delay enables the maximum and average relative error of the instantaneous flow to decrease by 20.3%, 9.3% and the maximum average error of the steady-state flow decreased by 73%, significantly improving computational accuracy. The average output flow rate of the hydraulic circuit at the operating frequency of
f = 100 Hz typically increases by 40% of the rated flow in comparison to that atf = 50 Hz when the effective opening timet se is between 2 ms and 7.43 ms. It is confirmed that fluid inertance has a significant impact on the delivery flow of digital hydraulic circuits. -
图 1 数字液压回路流量特性示意图
Figure 1. Schematic diagram of digital hydraulic circuit flow characteristics
图 2 两位两通高速电磁阀结构示意图
Figure 2. Schematic diagram of 2 way 2 port high speed solenoid valve
图 3 高速电磁阀动态启闭时间与典型运动状态示意图
Figure 3. Schematic diagram of dynamic opening and closing time and five typical motion states at high speed solenoid valve
图 5 不同有效占空比下动态、平均流量特性
Figure 5. Dynamic and steady-state flow characteristic at different duty cycle
图 6 不同有效开启时间下的液压回路平均输出流量
Figure 6. Measured mean delivery flow rate of hydraulic circuit at different effective opening time
图 7 高速电磁阀动态流量特性测试系统
Figure 7. High-speed solenoid valve dynamic flow characteristics testing system
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