Selection of parameters and estimation of traction-speed and fuel-economic properties of the city bus

Contents

Contents

Introduction

1. Determining the main parameters of the car

1.1 Calculation of the total weight of the car

1.2 Load distribution from the total weight of the car on the bridges

1.3 Selection of tyres and determination of wheel rolling radius

1.4 Selection of the frontal area of the car and calculation of the maximum value of the air resistance force to the movement of the car

1.5 Determination of maximum power, torque and engine crankshaft rpm at maximum torque

1.6 Calculation of the gear ratio of the main gear of the car

1.7 Determination of transmission ratios

1.7.1 Calculation of the gear ratio of the first gear

1.7.2 Calculation of intermediate gear ratios

2. Construction of external speed characteristic of the engine

3. Evaluation of traction and speed properties of the car

3.1. Traction characteristic of the car

3.1.1 Diagram of vehicle traction characteristics

3.1.2 Practical use of the traction characteristic of the car

3.2 Characterization of vehicle power balance

3.3 Dynamic characteristics of the vehicle

3.3.1 Graph of vehicle dynamic characteristics

3.3.2 Practical use of dynamic characteristic

3.4 Acceleration of the vehicle during acceleration

3.5 Characteristics of vehicle acceleration time and path

3.5.1 Determination of acceleration time

3.5.2 Determination of acceleration path

3.5.3 Practical use of time characteristics and acceleration path

4. Fuel efficiency of the car

4.1 Construction of fuel characteristic of vehicle steady-state motion

4.2 Practical use of the fuel characteristic of the steady-state movement of the car

4.2.1 Determination of control fuel consumption by car

4.2.2 Determination of operational fuel consumption by car

Conclusion

List of sources used

3.5 Characteristics of vehicle acceleration time and path

The acceleration time and path of the car is calculated on the assumption that it accelerates along a flat horizontal road with a full supply of fuel in a 2000 m long area (GOST 22576-90. PBX. Speed properties. Test methods).

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