Vehicle anti-lock braking method based on integrated electronic hydraulic brake system

A technology for hydraulic braking and vehicle braking, applied in the automotive field, can solve problems such as redesign, and achieve the effects of cost saving, simple control, and high control response speed

Inactive Publication Date: 2018-09-07
TONGJI UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although its structure has obvious advantages compared with the traditional ABS system, the control strategy needs to be redesigned to realize the ABS function

Method used

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  • Vehicle anti-lock braking method based on integrated electronic hydraulic brake system
  • Vehicle anti-lock braking method based on integrated electronic hydraulic brake system
  • Vehicle anti-lock braking method based on integrated electronic hydraulic brake system

Examples

Experimental program
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Effect test

Embodiment

[0039] Such as figure 1 As shown, this embodiment provides a vehicle anti-lock braking safety priority control strategy based on the integrated electronic hydraulic braking system. The control logic design takes the reduction of the wheel brake pressure as the primary factor, that is, when the When any wheel needs to reduce the pressure of its brake wheel cylinder, the vehicle controller will send an instruction to reduce the pressure to the motor controller. When the vehicle brakes, if the speed of the vehicle is higher than the linear velocity of each wheel, there will be slip between the tire and the road surface, and the degree of slip is expressed by the slip rate.

[0040]

[0041] In the formula: λ——slip ratio;

[0042] V x - vehicle speed;

[0043] w——wheel angular velocity;

[0044] r - the radius of the wheel.

[0045] Set two thresholds A for the slip ratio of each wheel 1 and A 2 , when the wheel slip rate exceeds the threshold value A 1 , it indicates t...

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Abstract

The invention relates to a vehicle anti-lock braking method based on an integrated electronic hydraulic brake system. The vehicle anti-lock braking method comprises the following steps that (1) wheelbrake pressure reduction is used as a primary factor of logic control, and two threshold values A1 and A2 are set for the slip ratio of each wheel; and (2) when wheels need to lower pressure of corresponding braking wheel cylinders, a vehicle control unit transmits a pressure reduction command to a motor controller, when the wheel slip ratio exceeds the threshold value A1, the wheel cylinders needs to be depressurized, and when the wheel slip ratio is less than the threshold value A2, the wheel cylinders need to be pressurized; and the vehicle speed is monitored, and when the vehicle speed isless than 5 m / s, a anti-lock braking system stops. Compared with the prior art, the vehicle anti-lock braking method based on the integrated electronic hydraulic brake system has the advantages of reduced structure, simple control, improved safety and the like.

Description

technical field [0001] The invention relates to the technical field of automobiles, in particular to a vehicle anti-lock brake method based on an integrated electronic hydraulic braking system. Background technique [0002] The promotion and popularization of new energy vehicles, especially electric vehicles, has promoted the development of the brake system in the direction of brake-by-wire, which is not only consistent with the development trend of modern automobiles towards modularization, integration, and mechatronics, but also in line with the development of automobiles for braking. New requirements of the system. [0003] Brake-by-wire systems can be divided into two categories, electro-hydraulic brakes (EHB) and electro-mechanical brakes (EMB). Among them, EHB replaces some mechanical parts in the traditional braking system with electronic components, and still retains the original mature and reliable hydraulic braking system to ensure the reliability of the braking s...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B60T8/172B60T8/1761B60T7/04B60T13/58B60T13/12B60T17/22
CPCB60T7/042B60T8/172B60T8/1761B60T13/12B60T13/58B60T17/22
Inventor 熊璐杨兴韩伟余卓平
Owner TONGJI UNIV
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