Course project theory of car movement

Contents

CONTENTS

Introduction

Construction of traction-Dynamic characteristic

Calculation of required engine power

Engine selection and characteristics

Calculation of transmission gear ratios

Construction of traction characteristic

To Build a Dynamic Characteristic

Calculation and construction of speed characteristic

Build Acceleration Feature

Construction of acceleration characteristic

Power balance of the car

Calculation and construction of fuel economy characteristics

Construction of fuel characteristic of steady-state motion

Construction of fuel and economic characteristics

Calculation and construction of braking characteristics

Building a Brake Chart

Conclusion

Bibliographic list

Introduction

A motor vehicle (PBX) is a trackless vehicle whose traction force is created by the operation of an engine (power source) and the interaction of driving wheels with a supporting surface. The theory of the operational properties of a car is a science that studies groups of properties that characterize the possibility of effective use of the car in certain operating conditions and allow you to assess the extent to which its design meets these conditions. Knowledge of the theory of the operational properties of the car is necessary when designing and refining new models, for rational selection and use in given operating conditions. Increasing the productivity of cars and reducing the cost of transportation is impossible without studying the operational properties of the car. A transport engine is a machine or unit that is designed to convert the liquid thermal energy of a fuel into mechanical energy, i.e., to useful work.

The traction-speed properties of the car characterize its ability to carry goods or passengers with the maximum possible average speed at given road conditions. The engine power, transmission gear ratios, and transmission efficiency have the greatest influence on traction and speed properties.

Fuel economy characterizes a set of properties that determine fuel consumption when a car performs transport work in various operating conditions.

Conclusion

According to the task given to me in this work, I calculated the main parameters of the UAZ3163 car.

Focusing on the prototype, to build an external speed characteristic, the power spent on overcoming the total road resistance at maximum speed, the power spent on overcoming air resistance at maximum speed, engine power at maximum car speed and maximum power are calculated. According to the Leiderman formula, I calculated the power and torque values ​ ​ depending on the different speeds of rotation of the crankshaft.

In addition, in my work, I calculated and built the traction characteristic of the car, the dynamic characteristic. Car accelerations were calculated depending on the speed of the car and the speed of the crankshaft.

The acceleration time and path indicators as well as the previous ones are calculated and summarized in the table according to which the graph is plotted.

The power characteristic is a graph of the dependence of powers on the speed of the car. The power usage graph shows the capacity values that are consumed during acceleration on different transmissions.

The calculation of fuel economy indicators allowed me to determine the hourly consumption of fuel and build a high-speed characteristic, fuel and economic .

List of literature used

OPERATING PROPERTIES OF AUTOMOBILES. Methodological guidelines for the implementation of the course project. For specialty 15.05 "Cars and automotive economy "/Comp. Ph.D., Associate Professor Asanbekov K.A. - 2014

Short car handbook of NIIAT. - M.: JSC "TRANSKOSULTING," 1994. – 779 pages.

The theory of cars and engines. Tutorial/Comp. Tarasik V.P. - Minsk, 2013. – 487 pages.

Theory of the operational properties of the car. Tutorial/Comp. Kuzmin N.A., Peskov V.I. - M., 2013. – 256 pages.

Car theory. Tutorial/Comp. Dyakov I.V. - USTU, 2000. – 150 pages.