湿式离合器先导式电液调压阀时频域建模与分析

doi:10.12382/bgxb.2022.0809

摘要/Abstract

摘要：

先导式电液调压阀是大功率湿式离合器换挡系统的核心部件,由于其多个环节存在参数时变和强非线性特征使其频率响应特性发生变化,进而影响换挡过程的油压调节的快速性与稳定性。在剖析先导式电液调压阀工作原理的基础上,考虑阻尼系数、流量系数和增益系数随油温的可变性,建立了先导式电液调压阀在工作过程中的数值模型,并推导了其频域模型。研究了先导式电液调压阀在不同参数下的时域和频域响应特性,得到了参数变化的影响规律。结果表明:增加系统响应的带宽会提高油压响应速度,但会降低阻尼比,使得油压响应的调节时间增加。系统的结构参数、输入信号以及工作油温均会影响其响应特性。基于该方法能够快速的判断先导式电液调压阀在全工作范围内的响应速度和稳定性问题,从而有助于改善先导式电液调压阀的油压动态跟踪性能。

关键词: 湿式离合器, 先导式电液调压阀, 时变参数, 频域特性

Abstract:

The pilot-operated electro-hydraulic pressure regulating valve (POEHPRV) is the core component of the high-power wet clutch shifting system. Due to the time-varying and strong nonlinear characteristics of its parameters in multiple stages, its frequency response characteristics are changed, which in turn affects the speed and stability of pressure response during the shifting process. The mathematical model of the POEHPRV is established based on analyzing the working principle of the POEHPRV and considering the variability of the damping coefficient, flow coefficient, and gain coefficient with oil temperature in the working process. The frequency-domain model is further built. The time-domain and frequency-domain response characteristics of the POEHPRV under different parameters are studied, and the influence of parameter variations is analyzed and discussed. The results show that increasing the bandwidth of the system response increases the pressure response speed but can reduce the damping ratio and increase the adjustment time of the pressure response. The structural parameters of the system, the input signal, and the oil temperature all affect its response characteristics. The response speed and stability of the POEHPRV in the whole working range can be quickly judged with this method, which helps improve the oil pressure dynamic tracking performance of the POEHPRV.

Key words: wet clutch, pilot-operated electro-hydraulic pressure regulating valve, time-varying parameters, frequency domain characteristics

中图分类号:

U463.2

任延飞, 席军强, 陈慧岩, 于会龙, 孟飞, 周卫. 湿式离合器先导式电液调压阀时频域建模与分析[J]. 兵工学报, 2023, 44(1): 222-232.

REN Yanfei, XI Junqiang, CHEN Huiyan, YU Huilong, MENG Fei, ZHOU Wei. Time-Frequency Domain Modeling and Analysis of Dynamic Characteristics of Pilot-Operated Electro-Hydraulic Pressure Regulating Valve for Wet Clutch[J]. Acta Armamentarii, 2023, 44(1): 222-232.

图/表 14

图1 湿式离合器换挡系统工作原理

Fig.1 Working principle diagram of the shifting system of the high power wet clutch

图2 先导式电液调压阀结构方案示意图

Fig.2 Schematic diagram of the structure for the pilot-operated electro-hydraulic pressure regulating valve

图3 先导式电液调压阀的传递函数框图

Fig.3 Transfer function block diagram of POEHPRV

表1 关键设备参数

Table 1 Parameters of key apparatus

名称	产品型号	关键参数
供油系统	定制	输出油压范围: 0~60bar 输出流量范围: 0~100L/min
直流电源	DH1720A-6	输出电压范围: 0~35V 输出电流范围: 0~10A
油压传感器	Gems 1200RGB6001	测量范围: 0~6MPa 精度: 1%
控制器(TCU)	dSPACE MicroAutoBox	最大工作频率: 10kHz
电流传感器	CKSR 6-NP	测量范围: -6~6A 精度: 0.5%

表2 先导式电液调压阀关键参数

Table 2 Key parameters of pilot-operated electro-hydraulic pressure regulating valve

参数	数值
先导控制油压p_s/MPa	1
主油压p_z/MPa	3
控制腔体积V_c/mL	10
反馈腔体积V_f/mL	1
工作腔体积V_o/mL	500
主阀芯直径D_dia/mm	18
反馈腔作用面积S_f/mm²	45.34
主阀芯质量M/g	25
主阀芯运动阻尼系数D_f/(N·(m·s^-1)^-1)	2
主阀弹簧刚度K_e/(N·mm^-1)	1.6
主阀弹簧预紧力x₀/N	2.8
油液弹性模型β_e/MPa	900
油液密度ρ/(kg·m^-3)	850

图4 先导式电液调压阀性能测试台

Fig.4 Test bench of pilot-operated electro-hydraulic pressure regulating valve

图5 不同电压输入下的油压阶跃响应

Fig.5 Pressure response results under different step voltages

图6 斜坡电压输入下的油压响应

Fig.6 Pressure response under ramp voltage

图7 不同输入节流孔尺寸的响应结果对比

Fig.7 Comparison of response results for different input orifice sizes

图8 不同反馈节流孔尺寸的响应结果对比

Fig.8 Comparison of response results for different feedback orifice sizes

图9 不同工作腔体积的响应结果对比

Fig.9 Comparison of response results for different working chamber volumes

图10 不同输入信号的响应结果对比

Fig.10 Comparison of response results for different input signals

图11 不同油温条件下的响应结果对比

Fig.11 Comparison of response results for different oil temperature conditions

图12 不同先导电磁阀速度的响应结果对比

Fig.12 Comparison of response results for different pilot solenoid valves

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