自适应模糊控制尾翼设计及其制动性能研究

doi:10.19562/j.chinasae.qcgc.2024.06.015

Abstract

Abstract:

As a key component of the performance cars and sports cars， the rear wing has a great impact on the drivability and stability of the car. During the driving process of cars， the speed， due to constant change of the acceleration， and the steering angle， the traditional design method of the rear wing system can’t take into account the nonlinear relationship between the input and output of the control system and the input uncertainty. In this paper， a design method for the rear wing based on the fuzzy control strategy is proposed to deal with above-mentioned problems. The relationship between vehicle speed and brake pedal travel with rear wing angle of attack is studied. The executive structure of the adaptive rear wing system is designed and stability analysis is carried out. The braking performance of the vehicle with added rear rights is simulated ad verified. The results show that the rear wing position can be adaptively controlled during vehicle driving by using this control strategy. The designed mechanism ensures the large speed ratio required for the wing transmission process and keeps the wing in the target position. Using the new designed adaptive rear wing， the driving stability is good at low speed， while the braking performance of the car at high speed is improved by 4.7%， with the braking distance reduced from 38.2 m to 36.9 m， shortened by 3.3%. This study provides a method for vehicle rear wing design that adapts to vehicle status， which is a reference for the improvement of automotive rear wing technology and industrial applications.

Key words: rear wing, adaptive fuzzy control, braking efficiency, CFD analysis, transfer function

Yizhe Chen,Yiqun Tang,Hui Wang,Bo Qin,Shiping Liang,Liu Yang. Research on Braking Performance of Automotive Rear Wing Designed by Adaptive Fuzzy Control Strategy[J].Automotive Engineering, 2024, 46(6): 1085-1095.

Figures/Tables 25

参数	数值
额定转矩 $T / (N ? m)$	1.47
空载电流 $I / A$	1.68
空载转速 $n / (r · m i n - 1)$	101.2
额定电流 $I / A$	4.03
额定转速 $n / (r ? m i n - 1)$	70.5
堵转电流 $I / A$	10.85
堵转转矩 $T /$ （N·m）	5.99

参数	数值
电机常数 $K m / (N ? m ? A - 1)$	2
转子转动惯量 $J / (k g ? m 2)$	5
摩擦因数 $b / (N ? m ? s ? r a d - 1)$	0.25
电驱电阻 $R a / Ω$	1.6
电压感应系数 $K b / (V ? s ? r a d - 1)$	0.8

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U		v
U		NB	NM	NS	ZE	PS	PM	PB
P	ZE	ZE	ZE	PZ	PZ	PS	PS	PM
	PZ	ZE	ZE	PZ	PS	PS	PS	PM
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材料	45钢
密度/（t·mm^-3）	7.89×10^-9
弹性模量/MPa	209 000
泊松比	0.3
屈服强度/MPa	355
抗拉强度/MPa	600
硬度/HBS	197

尾翼攻角/（°）	气动阻力/N
尾翼攻角/（°）	40 km/h	50 km/h	60 km/h	70 km/h	80 km/h	90 km/h	100 km/h	110 km/h
0	115.71	180.71	260.29	354.33	462.87	585.87	723.09	875.03
5	120.27	187.82	270.53	368.28	481.08	608.93	751.55	909.47
17	120.95	188.89	272.07	370.37	483.82	612.39	755.82	914.63
25	130.71	204.13	294.01	400.25	522.84	661.79	816.79	988.41
33	140.69	219.72	316.47	430.82	562.78	712.34	879.18	1 063.91
40	143.79	224.56	323.45	440.32	575.18	728.04	898.56	1 087.36
50	157.91	246.61	355.20	483.55	631.66	799.52	986.78	1 194.12

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Research on Braking Performance of Automotive Rear Wing Designed by Adaptive Fuzzy Control Strategy

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References 27

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