四凸极液冷电磁缓速器数值模拟与实验研究

doi:10.19562/j.chinasae.qcgc.2024.10.019

Abstract

Abstract:

To solve the problem of significant degradation in braking efficiency of medium and heavy-duty vehicles during prolonged downhill descents due to frequent engagement of the main brake system， a four salient poles liquid-cooled electromagnetic retarder structure is proposed in this paper. A vehicle downhill dynamics model is established to analyze the braking demand， using the magnetic equivalent circuit method to calculate its braking torque， and using the finite element method to numerically analyze its braking characteristics. The hierarchical variable domain fuzzy control strategy combined with a retarder is used for vehicle downhill braking control， and the controller and overall vehicle downhill braking model are established using MATLAB/Simulink for joint simulation. A 2 100 N·m prototype is designed. The braking characteristics of the prototype are tested through bench test and on-road vehicle tests. The results show that the actual measured value and the calculated value is basically consistent， with an average error within 5%， with the braking torque reaching 2 200 N·m when the speed is 1 250 r/min， which can meet the needs of medium and heavy duty vehicle braking.

Key words: four salient poles, retarder, magnetic equivalent circuit, braking characteristics, variable universe

Kai Zhang,Jiahan Bai,Liqiang Chen,Yangyang Lu,Weiyan Dong,Jigao Niu. Numerical Simulation and Experimental Study of Four Salient Poles Liquid-Cooled Electromagnetic Retarder[J].Automotive Engineering, 2024, 46(10): 1928-1936.

Figures/Tables 26

References 18

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参数	数值	参数	数值
整车质量m/t	18	风阻系数C	0.8
迎风面积S/m²	6	滚动阻力系数f	0.015
发动机气缸工作容积V_h/L	4.16	气缸数i	4
后桥速比k	4.875	发动机冲程数t	4
车轮半径r/mm	286	传动效率η	0.95

参数	数值	参数	数值
r₁/mm	70	L/mm	256
r₂/mm	141.4	L₁/mm	110
r₃/mm	142.2	L₂/mm	63
r₄/mm	174.7	L₃/mm	18
r₅/mm	189.7	α₁/（°）	50
r₆/mm	217.2	α₂/（°）	7.39
r₇/mm	218	α₃/（°）	28.7
r₈/mm	250	α₄/（°）	30

e_c	e
e_c	PB	PM	PS	Z	NS	NM	NB
PB	B	B	M	M	S	VS	Z
PM	B	M	M	S	S	VS	Z
PS	B	M	S	S	S	VS	Z
Z	B	M	VS	Z	Z	Z	Z
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Numerical Simulation and Experimental Study of Four Salient Poles Liquid-Cooled Electromagnetic Retarder

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Figures/Tables 26

References 18

Related Articles 5

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e_c	PB	PM	PS	Z	NS	NM	NB
PB	B	B	M	M	S	VS	Z
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空损力矩	转速/（r·min^-1）
空损力矩	500	750	1 000	1 250	1 500	1 750	2 000
T_f0/（N·m）	25	25	25	25	25	25	25
T_f1/（N·m）	29	31	34	35	36	36	38
T_b/（N·m）	4	6	9	10	11	11	13

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[4]	Ye Lezhi, Liu Yupeng, Li Desheng. Modeling and Experimental Study of Vehicle Permanent-magnetRetarder with Magneto-thermal Coupling [J]. , 2019, 41(1): 103-111.
[5]	Hu Donghai, He Ren, Hu Nannan, Yi Fengyan & Xu Xiaoming. A Study on the Influence of Braking Torque Control Method on the Energy Consumption Characteristics of Vehicle Eddy Current Retarder [J]. , 2018, 40(6): 679-.

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