液压机械全功率换段时机的非对称偏差特性

doi:10.3969/j.issn.1000-1093.2019.09.002

摘要/Abstract

摘要： 为了降低液压机械无级传动的换段冲击、减小制动器的磨损，基于液压机械全功率换段方法，研究适合工程应用的液压机械全功率换段时机的非对称偏差特性。以两段等差式液压机械为研究对象，在全功率换段方法基础上，建立全功率换段的前稳定阶段模型，包括双制动器结合重叠时的液压传动单元模型和制动器转矩模型。通过仿真分析与试验研究相结合方法，研究了换段时机超前、滞后对制动器滑摩过程和前稳定阶段的影响规律。结果表明：液压机械全功率换段中，由液压段向液压机械段换段时，理想换段时机宜设置负偏差；由液压机械段向液压段换段时，理想换段时机宜设置正偏差。所得结果揭示了换段时机偏差对换段性能的影响规律，可为液压机械全功率换段方法的工程应用提供参考。

关键词: 液压机械, 全功率换段, 换段时机, 无级传动, 动力换段, 非对称偏差

Abstract: In order to reduce the speed fluctuation and the wear of brakes, the asymmetric deviation characteristics of hydro-mechanical transmission （HMT） full power shift timing suitable for engineering applications are studied based on the full power shift method. A two-range arithmetic HMT is taken as the research object. The prior stable stage models of full power shift are established based on the full power shift method, including the hydraulic transmission model and brakes torque model during two brakes overlapping. The influences of advance and lag of shift timing on brake sliding process and prior stable stage are studied by theoretical analysis and experimental study. In the full power shift, the speed of fixed displacement hydraulic component can be lower than the ideal speed during the power shift from H range to HM range, and the negative deviation of ideal shift speed should be set. During the power shifting from HM range to H range, the speed of fixed displacement hydraulic component can be higher than the ideal speed, and the positive deviation of ideal shift speed should be set. The results reveal the influence of shift timing on the performance of prior stable stage. Key

Key words: hydro-mechanicalvariabletransmission, fullpowershift, shifttiming, continuouslyvariabletransmission, powershift, asymmetricdeviation

中图分类号:

TH137.7

杨树军，鲍永，张曼，张璐，张寅君，田霖. 液压机械全功率换段时机的非对称偏差特性[J]. 兵工学报, 2019, 40(9): 1770-1780.

YANG Shujun, BAO Yong, ZHANG Man, ZHANG Lu, ZHANG Yinjun, TIAN Lin. Asymmetric Deviation Characteristics of Hydro-mechanical Transmission Full Power Shift Timing[J]. Acta Armamentarii, 2019, 40(9): 1770-1780.

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ARMAMENTARIIVol.40No.9Sep.2019