Temperature rising state of the brake disc of electric bus on long-downhill considering kinetic energy recovery

doi:10.3969/j.issn.1674-8484.2023.03.002

Abstract

Abstract:

The high brake-disc temperature-rise in long downhill conditions was investigated for pure electric buses with central drive to improve the safety of pure electric buses. The simulations and the real road tests were used to investigate the temperature correlation between the ventilated disc brakes and the brake calipers of a certain vehicle model. A thermodynamic coupling model of brake disc was established based on Ansys Workbench software, and the temperature fitting function between brake caliper and brake disc was fitted by Matlab based on the experimental data. The results show that the continuous braking gradient is about 3.99% by anti-drag braking, and the service braking involvement is required when the gradient is larger. Brake calipers and disc temperature rise correlation coefficients is up to 0.9. That means that brake caliper temperature is used to monitor the brake-disc thermal decay for safety warning. These results provide data support for the long-downhill braking safety for pure electric buses.

Key words: pure electric buses, brake kinetic energy recovery, long-downhill, temperature rise, finite element analysis

CLC Number:

U467.1+4

LI Zitian, LI Bin, HUO Shenyang, ZHANG Jing, LÜ Xiaoxia. Temperature rising state of the brake disc of electric bus on long-downhill considering kinetic energy recovery[J]. Journal of Automotive Safety and Energy, 2023, 14(3): 274-281.

Figures/Tables 11

References 18

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环境温度，θ₀	22 ℃	摩擦因数	0.4±0.06
制动器效能因数	0.65	内制动衬片半径	110 mm
制动效率	0.95	制动器有效制动半径，	147 mm
制动盘直径	377 mm	制动盘与摩擦片间隙	0.7 mm
制动盘厚度	45 mm

环境温度，θ₀	22 ℃	摩擦因数	0.4±0.06
制动器效能因数	0.65	内制动衬片半径	110 mm
制动效率	0.95	制动器有效制动半径，	147 mm
制动盘直径	377 mm	制动盘与摩擦片间隙	0.7 mm
制动盘厚度	45 mm

路面类型	f / 10^-3
良好的沥青	10~18
一般的沥青	18~20
碎石	20~25
良好的卵石	25~30
坑洼的卵石	35~50
压紧干燥土路	25~35
压紧雨后土路	50~150
结冰	15~30
压紧雪道	30~50

路面类型	f / 10^-3
良好的沥青	10~18
一般的沥青	18~20
碎石	20~25
良好的卵石	25~30
坑洼的卵石	35~50
压紧干燥土路	25~35
压紧雨后土路	50~150
结冰	15~30
压紧雪道	30~50

车型	A / m²	C_D
典型轿车	1.7~2.1	0.30~0.41
货车	3.0~7.0	0.60~1.00
客车	4.0~7.0	0.50~0.80