18AU44 Automotive Engines syllabus for AU

Construction and Operation:

Engine classification, Constructional details of four stroke spark ignition (SI) and compression ignition (CI) engines. Working principles. Comparison of SI and CI engines , theoretical and actual valve timing diagrams for engines.

Engine Cycles:

theoretical Otto, diesel and dual cycles, Fuel-air Cycles and Actual cycle, numericals.

Construction of engine parts:

Cylinder, cylinder head, piston, piston pin, connecting rod, crank shaft, inlet and exhaust valves, flywheel, valve operating mechanisms,

Fuel Systems:

Air fuel ratio requirements of SI engines, Working of a simple fixed venturi carburetor and limitations, gasoline injection system, types, Diesel fuel injection systems-inline pumps, distributor pumps, Types of Nozzles, Unit injector and common rail injection systems, Need and types of governor for diesel engines and their comparison.

Cooling System:

Necessity, variation of gas temperature, Areas of heat flow, heat transfer, piston and cylinder temperature, Heat rejected to coolant, quantity of water required, air cooling, water cooling, thermodynamics of forced circulation, thermostats, pressurized water cooling, regenerative cooling, comparison of air and water cooling, radiators – types, cooling fan – power requirement, antifreeze solution, types of coolant.

Lubrication System:

Lubricants, lubricating systems, Lubrication of piston rings, bearings, oil consumption, additives and lubricity improvers, concept of adiabatic engines, oil filters, pumps, and crankcase ventilation – types.

Supercharging and Turbo charging:

Purpose, thermodynamic cycle, effect on the performance, turbo charging, limits of supercharging for petrol and diesel engines. Modifications of an engine for super charging - methods of super charging – super charging and turbo charging of two stroke and four stroke engines.

Two Stroke Engines:

Principles and working of two stroke engine (SI & CI), Port timing diagrams. Types - Three port engine, Separate pumps or blowers, Symmetrical & unsymmetrical timing, Cross flow, loop flow &uniflow type Scavenging systems. Scavenging Process – Pre blow down, Blow down, Scavenging, Additional Charging. Theoretical Scavenging processes, Scavenging parameters, Comparison of Different Scavenging Systems; port design, scavenging pumps

Course Outcomes:

At the end of the course the student will be able to:

• Explain need, constructional details and working of various auxiliary system used for internal combustion engine, scavenging systems for two stroke engines
• Calculate efficiency of theoretical , fuel air and actual cycles
• Choose cooling and lubrication system for internal combustion engine
• Analyse effect of supercharging and turbocharging on engine performance

Question paper pattern:

• The question paper will have ten full questions carrying equal marks.
• Each full question will be for 20 marks.
• There will be two full questions (with a maximum of four sub- questions) from each module.

Textbook/s

1 Internal Combustion Engines, V. Ganesan Tata McGraw Hill 2007

2 Internal Combustion Engines Ramalingam K. K. Sci-Tech Publications 2005

Reference Books

3 Internal Combustion Engines Mathur and Sharma Dhanpat Rai and Sons 2002

4 Fundamentals of Internal Combustion Engines John B. Heywood. McGraw Hill International Edition 1998

5 A course in I. C. Engines Mathur& Sharma Dhanpat Rai& sons, New Delhi 1994