方程式赛车AMT变速器设计与控制策略分析

学院（系）： 国际教育学院

专业班级：中英车辆工程1402班

学生姓名： 胡猛昕

指导教师： 余晨光

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Abstract

Transmission, which plays a decisive role in the performance of a racing car, forms an important part of an automobile. Due to the limitation of the traditional manual rocker in a small space in the formula car and its long shifting time, the gearbox is refitted to a pneumatic poke tablet and finally achieves the resemblance of the shifting mechanism in a F1 racing car.

According to regulation of FSC , we have refitted the original gearbox, designed the pneumatic shifting system and matched the corresponding shifting strategy. The original gearbox is a two-axe ordered formation with straight sliding gear and five speed, but without a synchronizer. First, the cylindrical cams are redesigned and the gear arrangement is changed to better adapt to FSC. Second, the pneumatic operation system is matched for the newly designed gearbox, design selections are conducted in gas source, decompression, direction change and conduction respectively to allow the driver to shift without hand leaving the steering wheel. Finally, after the design of basics, a complete shift control strategy is designed for the whole system of the car to increase the shift rate with high reliability and efficiency, to reduce the operating intensity for the driver, to decrease the interruption time of power and to enhance the average speed and stability.

Keywords: Shift Control Strategy, Pneumatic Operation System, Racing Car, Gearbox

Contents

Abstract 3

Chapter 1 Introduction 1

1.1 Research Backgrounds 1

1.2 Introduction of Suspension System 2

1.3 Domestic and Foreign Research Status 3

1.4 Main Contents and Technical Scheme 4

1.4.1 Main Contents 4

1.5 Chapter Summary 4

Chapter 2 Design and Modification of a racing transmission 5

2.1Design the Racing transmission 5

2.1.1 Determine the gear ratio of each gear 5

2.2 Modification requirements and purpose 10

2.3 Transmission modification structure design 11

2.5 Chapter Summary 16

Chapter 3 Pneumatic Execution System Design 17

3.1 Pneumatic system design purpose requirements 17

3.2 Pneumatic system design 18

3.2.1 Air source 18

3.2.2 Pressure reducing valve 20

3.2.3 Solenoid valve 21

3.2.4 cylinder actuator 24

3.3 Arrangement and Commissioning 27

3.5 Chapter Summary 28

Chapter 4 Shift Control Strategy Development 29

4.1 shift process design 29

4.1.1 Upshift control process 31

4.1.2 Downshift control process 32

4.2 Anti-missing and anti-interference design 33

4.3 Chapter Summary 34

Chapter 5 Summarization and Outlooks 35

5.1 Design Summarization 35

5.2 Shortage and Outlooks 35

References 37

Acknowledgements 39

Chapter 1 Introduction

The purpose of this project is to design a pneumatic shift system and a shift control strategy for the racing car participating in the FSAE competition to meet the requirements of various competitions.

The transmission is an important assembly of the car. Its quality has a decisive influence on the performance of the car. The formula driving car gives the driver a small driving operation space. The arrangement of the traditional manual rocker type shifting operating mechanism is limited by space. At the same time, the manual shifting time of the traditional structure is longer, so the racing transmission needs to be modified to adapt it. Match requirements.

1.1 Research Backgrounds

The automatic transmission is one of the key components of modern automobiles. Since the first automatic hydromechanical transmission in 1939 in the United States in the 70 years since the birth of GM, automatic transmission technology has been changing and improving [4]. As people's requirements for automotive comfort become higher and higher, automatic transmissions with superior overall performance are more and more popular with consumers than conventional manual transmissions. Especially in recent years, automatic transmissions have been able to better handle factors such as controllability and energy conservation and environmental protection, making it an ever-increasing proportion of equipment in domestic and foreign cars.

At present, there are mainly four types of automatic transmissions equipped on automobiles at home and abroad. They are:

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