Calculation of passenger car power plant (Prototype VAZ-2112)

Contents

Introduction

1 Technical characteristics of the EU-prototype

Brief analysis of its shortcomings

2 Selection of initial data for thermal, power

and strength calculations. Calculation of characteristic diameters of KSM parts

3 Thermal calculation

3.1 Intake Process

3.2 Compression Process

3.3 Combustion and expansion processes

3.4 Release Process

3.5 Operating cycle indicators

3.6 Effective engine performance

3.7 Main engine parameters

3.8 Heat balance

4 Kinematic and dynamic analysis of crank mechanism

4.1 Calculation and construction of piston displacement curve

4.2 Calculation and construction of piston speed curve

4.3 Calculation and construction of the curve of specific inertia forces

4.4 Calculation and construction of total gas pressure curve

and specific inertia forces

4.5 Calculation and construction of torque curve of one cylinder

4.6 Calculation and construction of the engine torque curve as a whole

5 Engine balancing

6 Calculation of parts of piston and connecting rod groups for strength

6.1 Calculation of piston group parts

6.1.1 Calculation of forces

6.1.2 Calculation of cylinder

6.1.3 Calculation of piston

6.1.4 Calculation of piston pin

6.2 Calculation of connecting rod group parts

6.2.1 Calculation of piston head of connecting rod

6.2.2 Calculation of rod and crank head of connecting rod

6.2.3 Calculation of connecting rod bolts

7 Comparative evaluation of developed engine in relation to

to the prototype

List of sources used

Appendix A Thermal, power and

strength calculation

Appendix B External speed characteristic of the engine

Introduction

The peculiarities and trends in the development of automotive power plant (ES) structures are completely determined by the requirements imposed on cars by industry and consumers. These requirements are to ensure the maximum performance of the car, the minimum cost of transportation with reliable and safe operation. The main requirements for automotive PUs are as follows:

1. The development of the necessary power at various speeds of the car, having good acceleration when touching the car from the spot and when changing its operating modes.

2. Maximum possible economy in all operating modes.

3. Simple design that simplifies the conditions for the release and subsequent repairs of automotive power plants and facilitates the conditions for their maintenance and operation .

4. Low production cost of automotive power plants, reduction of their weight .

5. It is possible to reduce the specific gravity and liter of the ED, achieved without reducing the reliability and durability of its operation.

6. Small overall dimensions.

7. The most expedient balancing of the PU and the necessary uniformity of travel, high reliability and durability of operation.

In accordance with the listed requirements, the design of automotive power plants is developing and improving in the directions of their maximum compliance with operating conditions, increasing economy and reducing cost.

The development line of modern automotive EVs can be characterized as follows: an increase in liter power while reducing its weight and dimensions and increasing economy. This is achieved mainly due to an increase in the number of GPM valves, pressurization, cooling of supercharging air, regulation of valve timing and lifting height, change in the length of the intake manifold, use of the "turbocharged" system, switching to injection of gasoline directly into the cylinder, electronic (microprocessor) control of both fuel equipment and electronic equipment as a whole.