Journal of Jilin University(Engineering and Technology Edition) ›› 2019, Vol. 49 ›› Issue (6): 1764-1776.doi: 10.13229/j.cnki.jdxbgxb20181106

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Brake force assistant technology for vehicle electronicstability control system

Li-qiang JIN(),Duan-yang TIAN,Hao TIAN,Meng-meng LIU   

  1. College of Automotive Engineering, Jilin University, Changchun 130022, China
  • Received:2018-11-05 Online:2019-11-01 Published:2019-11-08

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Abstract:

Aiming at driver panic or other factors causing the lack of braking force and decreasing the driver's braking operating burden when driving on a long ramp, HBA and HDC control strategy is carried out by Stateflow state machine theory and Matlab/Simulink. The brake pedal displacement and speed are selected as the identification parameters to better identify the driver intention. Meanwhile, the ramp recognition is designed by Newton's second law. Considering the braking problem of high temperature failure, the temperature model is built. Based on the above, MIL and HIL are carried out, the results verify the correctness of the control strategy. In addition, road tests' results show the HBA function can meet the ECE standard and the HDC function can keep vehicle speed near the target speed, proving that the control strategy achieved good control effect.

Key words: vehicle engineering, brake force assist, hydraulic brake assist, hill descent control

CLC Number: 

  • U463.53

Table 1

Brake pedal force and displacementsensor parameters"

名称 型号 参数

制动踏板位

移传感器

 SENST2-631

量程为635 mm，输出为0~5 V，

精度为0.25% FS

制动踏板

力传感器

 PKH2.0 输出为0~1.5 V，K值系数为1 000 N/V，即量程为1 500 N

Fig.1

Test results of emergency braking intentionrecognition parameters"

Fig.2

Filtered acceleration and filtered acceleration measured by sensors"

Fig.3

Flow chart of HBA control theory"

Fig.4

HBA and ABS coordinated control theory"

Fig.5

Flow chart of HDC control theory"

Fig.6

Co-simulating architecture"

Table 2

Vehicle parameters"

参数 数值 参数 数值
前轴到质心距离l f/mm 1 040 x轴转动惯量Ixx /(kg·m2) 288
前、后轴距离l/mm 2 600 y轴转动惯量Iyy /(kg·m2) 2 031.4
质心高度h c/mm 540

z轴动惯量Izz /

(kg·m2)

 2 031.4
左、右车轮距离d/mm 1 481 车轮转动惯量I w/(kg·m2) 0.6
簧载质量M s/kg 1 111 车轮滚动半径R dyn/mm 304

Fig.7

HBA and HDC state transition"

Fig.8

Master cylinder pressure"

Fig.9

Wheel cylinder pressure"

Fig.10

Off-line simulation vehicle velocity curves"

Fig.11

Braking deceleration with and without HBA"

Fig.12

HBA state transition flag"

Fig.13

Vehicle velocity at 20% slope"

Fig.14

Vehicle deceleration with HDC at 20% slope"

Fig.15

HIL test architecture"

Fig.16

HIL vehicle velocity curves"

Fig.17

Vehicle velocity at 20% slope"

Fig.18

Wheel cylinder pressure"

Fig.19

Test vehicle and pavement"

Fig.20

ABS function test curves"

Fig.21

Test results with HBA intervention"

Fig.22

Relationship curve of pedal force andaverage acceleration"

Fig.23

HBA test results curves"

Fig.24

HDC real vehicle test result curve"

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