Time-Frequency Domain Modeling and Analysis of Dynamic Characteristics of Pilot-Operated Electro-Hydraulic Pressure Regulating Valve for Wet Clutch

doi:10.12382/bgxb.2022.0809

Abstract

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

CLC Number:

U463.2

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.

Figures/Tables 14

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

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

Fig.3 Transfer function block diagram of POEHPRV

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%

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

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

Fig.5 Pressure response results under different step voltages

Fig.6 Pressure response under ramp voltage

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

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

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

Fig.10 Comparison of response results for different input signals

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

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

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