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| Study on Adaptability of Oil Pressure Control System Under Abrupt Working Condition of the Excavator |
| DOI：10.13949/j.cnki.nrjgc.2023.05.007 |
| Key Words:lubrication system pressure regulating control mode frequency domain analysis low frequency and high energy pulsation excavator engine |
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| 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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