| 崔永,申加伟,刘洋,等.油压调控系统在挖机瞬变工况下的适应性研究[J].内燃机工程,2023,44(5):50-56. |
| 油压调控系统在挖机瞬变工况下的适应性研究 |
| Study on Adaptability of Oil Pressure Control System Under Abrupt Working Condition of the Excavator |
| DOI：10.13949/j.cnki.nrjgc.2023.05.007 |
| 关键词:润滑系统 调压控制方式 频域分析 低频高能脉动 挖掘机 发动机 |
| Key Words:lubrication system pressure regulating control mode frequency domain analysis low frequency and high energy pulsation excavator engine |
| 基金项目: |
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| 摘要:针对挖机机油滤清器异常受载问题，借助自主高频压力测试系统采集典型路谱并利用频域分析解读了低频高能脉动现象。根据主油道压力和低频脉动的强相关性浅析论证了低频波的产生机理，其来源于信号调节需求下的阀芯受迫位移变化引起的泄流不均衡，且阀芯的轴向振动频率由弹簧刚度与液动力刚度共同决定。在对比分析几种典型调压控制方式的基础上，验证了不同优化方案及竞品的油压脉动情况，结果表明：减小机油泵流量及采用主油道直泄调压等方式可有效消除低频脉动，相对而言，主油道直泄调压因其对机油泵流量不敏感而具有更强的适应性。 |
| Abstract:To solve the problem of the abnormal load of the excavator oil filter， the typical circuit spectrum was collected by the autonomous high-frequency pressure test system and the low-frequency and high-energy pulsation phenomenon was interpreted by the frequency domain analysis. According to the strong correlation between main oil passage pressure and low-frequency pulsation， the generation mechanism of low-frequency wave was analyzed and demonstrated， which originated from the disequilibrium of discharge caused by the change of forced displacement of spool under the demand of signal regulation， and the axial vibration frequency of spool was determined by the spring stiffness and the hydrodynamic stiffness. On the basis of the comparison and analysis of several typical regulating control methods， validation of different optimization and competing products were studied. The results show that the reduction of the oil pump flow and oil pressure regulating straightly are both effective in eliminating the low frequency pulse. Relatively speaking， the latter way has stronger adaptability for it is not sensitive to the oil pump flow. |
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