基于主客观综合赋权法的制动踏板感觉评价

doi:10.19562/j.chinasae.qcgc.2021.05.008

Abstract

Abstract:

The brake pedal feeling directly affects braking safety and driving comfort. In order to accurately and reliably describe the brake pedal feeling of the vehicle， this paper proposes a brake pedal feel evaluation method based on the subjective and objective comprehensive weighting method. Firstly， the subjective scores and objective test data of each evaluation index are obtained through real?vehicle experiments. Then， the hierarchical structure model of brake pedal feeling is built， and the subjective weight is obtained based on the triangular fuzzy analytic hierarchy process， the objective weight is obtained based on the entropy method， and the comprehensive weight is obtained based on the subjective and objective comprehensive weighting method. Finally， the fuzzy comprehensive evaluation theory is used to obtain the pedal feeling evaluation score and the membership grade of the test car， and the effectiveness of the evaluation results is verified by comparing with the brake feeling index evaluation method. The results show that the brake pedal feeling evaluation system based on the subjective and objective comprehensive weighting method proposed in this paper establishes a unified test condition and subjective scoring standard， which integrates subjective scoring and objective data to achieve a dimensionless and standardized expression of brake pedal feeling evaluation results.

Key words: vehicle engineering, evaluation of brake pedal feeling, subjective and objective comprehensive weighting approach, triangular fuzzy analytic hierarchy process, entropy method

Bing Zhu,Wanli Jin,Lun Li,Jian Zhao,Zhicheng Chen,Yihan Zhang,Weinan Li. Evaluation of Brake Pedal Feeling Based on Subjective and Objective Comprehensive Weighting Method[J].Automotive Engineering, 2021, 43(5): 697-704.

Figures/Tables 14

指标

权重向量

W

λ m a x

1级指标

W Z = 0.27,0.31,0.13,0.12,0.17

5.30

0.067

踏板力

2级指标

W A 1 = 0.36,0.13,0.13,0.38

4.01

0.004

踏板行程2级指标

W A 2 = 0.68,0.32

2.00

评价指标	权重/%	目标值	计算方法
踏板预置力 (B₁)	7	13 N	超过目标每4.45 N，减1.25%
制动初始点踏板力 (B₂)	7	27 N	超过目标每4.45 N，减1.25%
正常制动至0.5g时的踏板 (B₃)	12	80 N	超过目标每4.45 N，减1.25%
满载最大制动减速度时踏板力 (B₄)	25	245 $×$ MaxDecel+7/3 N	超过目标每17.8 N，减1.25%
制动初始点踏板行程 (B₅)	25	23 mm	超过目标每2.25 mm，减2.5%
正常制动至0.5g时的踏板行程 (B₆)	12	30 mm	超过目标每5 mm，减1.25%；不足目标每2.5 mm，1.25%
踏板力线性指数 (B₈)	12	0.85~1.05	不足或超过目标每0.025，减1.25%

References 18

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评价内容	评分标准
踏板力	偏轻或偏重 1 得分 10 适中
踏板行程	偏短或偏长 1 得分 10 适中
助力器跳跃值	偏小或偏大 1 得分 10 适中
踏板力线性指数	无线性 1 得分 10 线性
制动响应时间	慢 1 得分 10 快
评价等级	很差	差	一般	良好	出色
分值区间	[0,3)	[3,4.5)	[4.5,6.5)	[6.5,8.5)	[8.5,10]
评价等级加权值	1.5	3.75	5.5	7.5	9.25

序号	评价指标	#1	#2	#3	#4	#5	#6	#7	#8	#9	#10	#11	#12
1	踏板预置力（B₁）	7	7	9	8	8	7	9	8	7	9	7	8
2	初始制动时对应的踏板力（B₂）	7	8	8	8	8	7	9	8	8	9	8	8
3	中等制动强度对应的踏板力（B₃）	7	6	8	8	8	6	9	6	8	8	8	8
4	满载最大制动减速度时踏板力（B₄）	8	7	7	8	8	6	8	6	8	8	8	7
5	初始制动时对应的踏板行程（B₅）	8	6	8	9	7	7	9	9	9	9	7	7
6	中等制动强度对应的踏板行程（B₆）	8	7	8	8	8	7	9	8	8	8	7	8
7	助力器跳跃值（B₇）	7	7	7	8	8	7	9	8	8	8	7	7
8	踏板力线性指数（B₈）	6	6	8	9	9	7	8	8	8	7	8	8
9	制动响应时间（B₉）	8	7	9	9	9	8	9	9	9	9	9	9

Z	A₁	A₂	A₃	A₄	A₅
A₁	1	0.75	1.83	3	2.17
A₂	1.33	1	2	3	2
A₃	0.55	0.5	1	0.55	1.17
A₄	0.33	0.33	1.83	1	0.33
A₅	0.46	0.5	0.85	3	1

评价指标	B₁	B₂	B₃	B₄	B₅	B₆	B₇	B₈	B₉
主观权重	0.10	0.04	0.04	0.10	0.21	0.10	0.13	0.11	0.17
客观权重	0.13	0.14	0.18	0.12	0.11	0.10	0.07	0.01	0.14
综合权重	0.11	0.08	0.11	0.11	0.16	0.10	0.11	0.06	0.16

指标	B₁	B₂	B₃	B₄	B₅	B₆	B₇	B₈	B₉	总BFI值
参数值	24.6	34.3	95.4	119.1	24.6	46		0.74
BFI值	3.7	4.9	7.7	25.0	23.2	8.0		6.5		79.0

Evaluation of Brake Pedal Feeling Based on Subjective and Objective Comprehensive Weighting Method

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