Graduation Design (Dissertation) of Wuhan University of Technology

Design of Braking System for Driverless Intelligent Transfer Vehicle

College: International Education College

Specialty amp; Class: Automobile GJ1401

Student name: WenBo Huang

Tutor: Li Xu

Statement of Originality

I solemnly declare that the thesis I submit is a piece of writing I completed independently based on my own research under the guidance of my supervisor. Except for the quotations, this paper does not include any writings published or completed by other individuals or groups. I am fully aware that the legal consequences of this statement are borne by me.

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Abstract

Due to the rapid progress of the domestic automobile industry, driverless cars are rapidly entering people's lives, and the safety performance of driverless smart cars has always been one of the topics most concerned by people. Among all automotive systems, the brake system is an important system for active vehicle safety. With the continuous development and application of driverless smart vehicles, people can live their lives to the utmost extent, and the intelligent driverless transport vehicle is one of them. As a vehicle that is very close to people's daily life, the reliability of the braking system must be effectively guaranteed

The brake is an important part of the brake system. In this paper, the classification, principle, advantages and disadvantages of the brake are analyzed firstly. Then, according to the various structural parameters of the studied vehicle model, the cam brake drum is finally selected. Then refer to relevant data to design its parameters. Then combined with the characteristics of the electric drive designed the relevant brake drive mechanism, and the CAE modeling of the designed drum brake and drive mechanism. And through the PID control, real vehicle experiments and other feedback data obtained to improve the braking efficiency.

.Key Words：Drum brakes; Braking drive mechanism design; 3D modeling; PID control

目录

I INTRODUCTION 2

1.1 Purpose and significance 2

1.2 Research status at home and abroad 2

1.2.1 Foreign research status 2

1.2.2 Domestic research status analysis 3

1.3 chapter summary 4

II Brake analysis and selection 5

2.1 Disc type, drum brake comparison selection 5

2.2 Drum brake structure analysis 6

2.3 chapter summary 8

III Design and verification of brakes 10

3.1 Calculation of braking torque and braking force 10

3.1.1 Determination of total braking torque 10

3.2 Drum brake structure parameters 11

3.2.1 Brake drum inner diameter D 11

3.2.2 Friction lining width b and wrap angle β 12

3.2.3 Friction lining starting angle β₀ 14

3.2.4 The distance from the center of the brake to the line of action of the opening force F₀ 14

3.2.5 Brake shoe position coordinates a and c 14

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