1. Duty of Real I. C. Engines As an Automotive Prime Mover
P M V Subbarao
Professor
Mechanical Engineering Department
Vehicle is Boss & Engine is the Servant!!!

2. Indian Urban Driving Cycle

3. Forces To be Overcome by an Automobile

4. Resistance Forces on A Vehicle
The major components of the resisting forces to motion are comprised of :
Acceleration forces (Faccel = ma & I forces)
Aerodynamic loads (Faero)
Gradeability requirements (Fgrade)
Chassis losses (Froll resist ).
The new A4 Sedan has the best drag coefficient in its class at 0.23, while Avant has cd 0.26.
Its weight has been reduced by up to 120 kilograms.

5. Power Requirements Curves for An Accelerating vehicle
2.78m/s2
2.20m/s2
The A4 Sedan with quattro drive and 2.0 TFSI, the gasoline ultra model takes 7.3 seconds from 0 to 100 km/h
1.38m/s2
0.83m/s2

6. Vehicle Speed vs. Engine Speed=
velocity , km/hr r
wheel radius, m
Ncrank
crankshaft rpm i
driveline slippage GO
Overall gear reduction ratio

7. Characteristics of Real Engine at Maximum Fuel Consumption

8. Required Torque & Power at Wheels
Tractive Effort demanded by a vehicle):

9. Calculation of Mileage of a Constant Speed Vehicle
Cycle work to be provided by A Powering Engine:
The speed of the vehicle in km/h is:
Time required to travel 1 km distance by vehicle in hours:
Work to be done by Engine for Unit Distance Travel by Vehicle
Engine Fuel Consumption for Unit Distance Travel by Vehicle

10. Measure of fuel Economy
In the NEDC (New European Driving Cycle), the 1.4 TFSI with S tronic consumes 4.9 liters per 100 kilometers.
The Sedan with front-wheel drive and S tronic consumes 5.7 liters of fuel per 100 kilometers in the NEDC.

11. Displacement Work Devices for Execution of Macro Thermodynamic Operations
Intake
Stroke
Combustion
Products
Exhaust
Stroke
Power
Stroke
Compression
Stroke

12. Control System of A Conventional I.C. Engine
Primary Thermodynamic Requirement:
How to select other geometrical parameters?