基于改进遗传算法的湿式离合器压力自适应控制

doi:10.13229/j.cnki.jdxbgxb.20220991

Abstract

Abstract:

Aiming to improve the accuracy of wet clutch pressure control of tractor power shift transmission （PST）， a model-free adaptive control method for wet clutch pressure based on improved genetic algorithm is proposed. Firstly， the mathematical model of the wet clutch hydraulic system was analyzed and established， and the clutch pressure controller was constructed based on the partial form dynamic linearization based model free adaptive control （PFDL-MFAC） algorithm. Then， the variable-proportion elite retention strategy， K-means clustering algorithm and catastrophe strategy were introduced to improve the genetic algorithm， and a PFDL-MFAC controller parameter tuning method based on sensitivity analysis and improved genetic algorithm was proposed. Finally， the clutch pressure control test based on the tractor transmission control unit （TCU） hardware-in-the-loop test platform was carried out. The results show that the improved genetic algorithm has better convergence speed and optimization accuracy. Compared with PID， PFDL-MFAC has faster clutch pressure response and better robustness， which can meet the requirements of tractors. At the same time， the shifting quality of the transmission based on the algorithm in this paper is better. The research results provide a basis for improving the shifting quality of power-shift tractors.

Key words: agricultural engineering, tractor, wet clutch, model free adaptive control, genetic algorithm

CLC Number:

S219.032.1

Yan-an ZHANG,Yue-feng DU,Qing-feng MENG,Xiao-yu LI,Lei LIU,Zhong-xiang ZHU. Adaptive control of wet clutch pressure based on improved genetic algorithm[J].Journal of Jilin University(Engineering and Technology Edition), 2024, 54(3): 852-864.

Figures/Tables 14

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变量	参数
供油压力p_s/Pa	2×10⁶
油液密度ρ/（kg·m^-3）	900
等效体积弹性模量β_e/Pa	1.7×10⁹
比例减压阀节流孔数量n_v	6
比例减压阀节流孔直径d/m	0.003
比例减压阀阀芯质量m_v/kg	0.015
比例减压阀回位弹簧刚度k_v/（N·m^-1）	2000
比例减压阀回位弹簧初始位移x_v0/m	0.001
比例减压阀反馈腔阻尼孔直径d_f/m	0.005
比例减压阀反馈腔初始容积V_f0/m³	8.92×10^-7
比例减压阀主腔容积V_v/m³	4×10^-5
离合器油缸进油口直径d_L/m	0.0035
活塞等效质量m_L/kg	0.65
活塞回位弹簧刚度K_L/（N·m^-1）	104 500
活塞回位弹簧预压力F_L0/N	3094
活塞外半径R₂/m	0.07
活塞内半径R₁/m	0.035
摩擦片等效刚度K_n/（N·m^-1）	1.6134×10⁸
摩擦片Kisspoint点Δ/m	0.004

参数	DS	不灵敏参数取值	参数	DS	不灵敏参数取值
λ	0.9962	0.6	ε₁	0.9987	0.56
μ	0.9913	0.012	ε₂	0.9980	0.95
η	0.9945	2	α	0.9978	1.50
ρ₁	0.7364	-	W₁（0）	0.6329	-
ρ₂	0.9333	0.15	W₂（0）	0.6748	-
ρ₃	0.9625	0.15	W₃（0）	0.9452	0.01

Adaptive control of wet clutch pressure based on improved genetic algorithm

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